0.40.0

Close #3269

.github/workflows/linux.yml

@@ -20,7 +20,7 @@ jobs:
         fetch-depth: 0
 
     - name: Set up Go
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v4
       with:
         go-version: 1.19
 

.github/workflows/macos.yml

@@ -20,7 +20,7 @@ jobs:
         fetch-depth: 0
 
     - name: Set up Go
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v4
       with:
         go-version: 1.18
 

.github/workflows/typos.yml

@@ -0,0 +1,10 @@
+name: "Spell Check"
+on: [pull_request]
+
+jobs:
+  typos:
+    name: Spell Check with Typos
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: crate-ci/typos@v1.13.16

.github/workflows/winget.yml

@@ -0,0 +1,15 @@
+name: Publish to Winget
+on:
+  release:
+    types: [released]
+
+jobs:
+  publish:
+    runs-on: windows-latest # Action can only run on Windows
+    steps:
+      - uses: vedantmgoyal2009/winget-releaser@v2
+        with:
+          identifier: junegunn.fzf
+          version: ${{ github.event.release.tag_name }}
+          installers-regex: '-windows_(armv7|arm64|amd64)\.zip$'
+          token: ${{ secrets.WINGET_TOKEN }}

.goreleaser.yml

@@ -74,6 +74,7 @@ builds:
       - arm64
       - loong64
       - ppc64le
+      - s390x
     goarm:
       - 5
       - 6

.tool-versions

@@ -1 +1 @@
-golang 1.19
+golang 1.20.2

ADVANCED.md

@@ -1,30 +1,33 @@
 Advanced fzf examples
 ======================
 
-*(Last update: 2022/08/25)*
+* *Last update: 2023/02/15*
+* *Requires fzf 0.38.0 or above*
+
+---
 
 <!-- vim-markdown-toc GFM -->
 
 * [Introduction](#introduction)
 * [Screen Layout](#screen-layout)
-  * [`--height`](#--height)
+    * [`--height`](#--height)
-  * [`fzf-tmux`](#fzf-tmux)
+    * [`fzf-tmux`](#fzf-tmux)
-    * [Popup window support](#popup-window-support)
+        * [Popup window support](#popup-window-support)
 * [Dynamic reloading of the list](#dynamic-reloading-of-the-list)
-  * [Updating the list of processes by pressing CTRL-R](#updating-the-list-of-processes-by-pressing-ctrl-r)
+    * [Updating the list of processes by pressing CTRL-R](#updating-the-list-of-processes-by-pressing-ctrl-r)
-  * [Toggling between data sources](#toggling-between-data-sources)
+    * [Toggling between data sources](#toggling-between-data-sources)
 * [Ripgrep integration](#ripgrep-integration)
-  * [Using fzf as the secondary filter](#using-fzf-as-the-secondary-filter)
+    * [Using fzf as the secondary filter](#using-fzf-as-the-secondary-filter)
-  * [Using fzf as interactive Ripgrep launcher](#using-fzf-as-interactive-ripgrep-launcher)
+    * [Using fzf as interactive Ripgrep launcher](#using-fzf-as-interactive-ripgrep-launcher)
-  * [Switching to fzf-only search mode](#switching-to-fzf-only-search-mode)
+    * [Switching to fzf-only search mode](#switching-to-fzf-only-search-mode)
-  * [Switching between Ripgrep mode and fzf mode](#switching-between-ripgrep-mode-and-fzf-mode)
+    * [Switching between Ripgrep mode and fzf mode](#switching-between-ripgrep-mode-and-fzf-mode)
 * [Log tailing](#log-tailing)
 * [Key bindings for git objects](#key-bindings-for-git-objects)
-  * [Files listed in `git status`](#files-listed-in-git-status)
+    * [Files listed in `git status`](#files-listed-in-git-status)
-  * [Branches](#branches)
+    * [Branches](#branches)
-  * [Commit hashes](#commit-hashes)
+    * [Commit hashes](#commit-hashes)
 * [Color themes](#color-themes)
-  * [Generating fzf color theme from Vim color schemes](#generating-fzf-color-theme-from-vim-color-schemes)
+    * [Generating fzf color theme from Vim color schemes](#generating-fzf-color-theme-from-vim-color-schemes)
 
 <!-- vim-markdown-toc -->
 
@@ -236,15 +239,13 @@ file called `rfv`.
 # 1. Search for text in files using Ripgrep
 # 2. Interactively narrow down the list using fzf
 # 3. Open the file in Vim
-IFS=: read -ra selected < <(
+rg --color=always --line-number --no-heading --smart-case "${*:-}" |
-  rg --color=always --line-number --no-heading --smart-case "${*:-}" |
+  fzf --ansi \
-    fzf --ansi \
+      --color "hl:-1:underline,hl+:-1:underline:reverse" \
-        --color "hl:-1:underline,hl+:-1:underline:reverse" \
+      --delimiter : \
-        --delimiter : \
+      --preview 'bat --color=always {1} --highlight-line {2}' \
-        --preview 'bat --color=always {1} --highlight-line {2}' \
+      --preview-window 'up,60%,border-bottom,+{2}+3/3,~3' \
-        --preview-window 'up,60%,border-bottom,+{2}+3/3,~3'
+      --bind 'enter:become(vim {1} +{2})'
-)
-[ -n "${selected[0]}" ] && vim "${selected[0]}" "+${selected[1]}"
 ```
 
 And run it with an initial query string.
@@ -307,8 +308,12 @@ I know it's a lot to digest, let's try to break down the code.
       position in the window
     - `~3` makes the top three lines fixed header so that they are always
       visible regardless of the scroll offset
-- Once we selected a line, we open the file with `vim` (`vim
+- Instead of using shell script to process the final output of fzf, we use
-  "${selected[0]}"`) and move the cursor to the line (`+${selected[1]}`).
+  `become(...)` action which was added in [fzf 0.38.0][0.38.0] to turn fzf
+  into a new process that opens the file with `vim` (`vim {1}`) and move the
+  cursor to the line (`+{2}`).
+
+[0.38.0]: https://github.com/junegunn/fzf/blob/master/CHANGELOG.md#0380
 
 ### Using fzf as interactive Ripgrep launcher
 
@@ -331,16 +336,14 @@ projects, and it will free up memory as you narrow down the results.
 # 3. Open the file in Vim
 RG_PREFIX="rg --column --line-number --no-heading --color=always --smart-case "
 INITIAL_QUERY="${*:-}"
-IFS=: read -ra selected < <(
+FZF_DEFAULT_COMMAND="$RG_PREFIX $(printf %q "$INITIAL_QUERY")" \
-  FZF_DEFAULT_COMMAND="$RG_PREFIX $(printf %q "$INITIAL_QUERY")" \
+fzf --ansi \
-  fzf --ansi \
+    --disabled --query "$INITIAL_QUERY" \
-      --disabled --query "$INITIAL_QUERY" \
+    --bind "change:reload:sleep 0.1; $RG_PREFIX {q} || true" \
-      --bind "change:reload:sleep 0.1; $RG_PREFIX {q} || true" \
+    --delimiter : \
-      --delimiter : \
+    --preview 'bat --color=always {1} --highlight-line {2}' \
-      --preview 'bat --color=always {1} --highlight-line {2}' \
+    --preview-window 'up,60%,border-bottom,+{2}+3/3,~3' \
-      --preview-window 'up,60%,border-bottom,+{2}+3/3,~3'
+    --bind 'enter:become(vim {1} +{2})'
-)
-[ -n "${selected[0]}" ] && vim "${selected[0]}" "+${selected[1]}"
 ```
 
 ![image](https://user-images.githubusercontent.com/700826/113684212-f9ff0a00-96ff-11eb-8737-7bb571d320cc.png)
@@ -358,8 +361,6 @@ IFS=: read -ra selected < <(
 
 ### Switching to fzf-only search mode
 
-*(Requires fzf 0.27.1 or above)*
-
 In the previous example, we lost fuzzy matching capability as we completely
 delegated search functionality to Ripgrep. But we can dynamically switch to
 fzf-only search mode by *"unbinding"* `reload` action from `change` event.
@@ -375,19 +376,17 @@ fzf-only search mode by *"unbinding"* `reload` action from `change` event.
 # 3. Open the file in Vim
 RG_PREFIX="rg --column --line-number --no-heading --color=always --smart-case "
 INITIAL_QUERY="${*:-}"
-IFS=: read -ra selected < <(
+FZF_DEFAULT_COMMAND="$RG_PREFIX $(printf %q "$INITIAL_QUERY")" \
-  FZF_DEFAULT_COMMAND="$RG_PREFIX $(printf %q "$INITIAL_QUERY")" \
+fzf --ansi \
-  fzf --ansi \
+    --color "hl:-1:underline,hl+:-1:underline:reverse" \
-      --color "hl:-1:underline,hl+:-1:underline:reverse" \
+    --disabled --query "$INITIAL_QUERY" \
-      --disabled --query "$INITIAL_QUERY" \
+    --bind "change:reload:sleep 0.1; $RG_PREFIX {q} || true" \
-      --bind "change:reload:sleep 0.1; $RG_PREFIX {q} || true" \
+    --bind "alt-enter:unbind(change,alt-enter)+change-prompt(2. fzf> )+enable-search+clear-query" \
-      --bind "alt-enter:unbind(change,alt-enter)+change-prompt(2. fzf> )+enable-search+clear-query" \
+    --prompt '1. ripgrep> ' \
-      --prompt '1. ripgrep> ' \
+    --delimiter : \
-      --delimiter : \
+    --preview 'bat --color=always {1} --highlight-line {2}' \
-      --preview 'bat --color=always {1} --highlight-line {2}' \
+    --preview-window 'up,60%,border-bottom,+{2}+3/3,~3' \
-      --preview-window 'up,60%,border-bottom,+{2}+3/3,~3'
+    --bind 'enter:become(vim {1} +{2})'
-)
-[ -n "${selected[0]}" ] && vim "${selected[0]}" "+${selected[1]}"
 ```
 
 * Phase 1. Filtering with Ripgrep
@@ -408,10 +407,8 @@ IFS=: read -ra selected < <(
 
 ### Switching between Ripgrep mode and fzf mode
 
-*(Requires fzf 0.30.0 or above)*
+[fzf 0.30.0][0.30.0] added `rebind` action so we can "rebind" the bindings
-
+that were previously "unbound" via `unbind`.
-fzf 0.30.0 added `rebind` action so we can "rebind" the bindings that were
-previously "unbound" via `unbind`.
 
 This is an improved version of the previous example that allows us to switch
 between Ripgrep launcher mode and fzf-only filtering mode via CTRL-R and
@@ -421,25 +418,34 @@ CTRL-F.
 #!/usr/bin/env bash
 
 # Switch between Ripgrep launcher mode (CTRL-R) and fzf filtering mode (CTRL-F)
+rm -f /tmp/rg-fzf-{r,f}
 RG_PREFIX="rg --column --line-number --no-heading --color=always --smart-case "
 INITIAL_QUERY="${*:-}"
-IFS=: read -ra selected < <(
+FZF_DEFAULT_COMMAND="$RG_PREFIX $(printf %q "$INITIAL_QUERY")" \
-  FZF_DEFAULT_COMMAND="$RG_PREFIX $(printf %q "$INITIAL_QUERY")" \
+fzf --ansi \
-  fzf --ansi \
+    --color "hl:-1:underline,hl+:-1:underline:reverse" \
-      --color "hl:-1:underline,hl+:-1:underline:reverse" \
+    --disabled --query "$INITIAL_QUERY" \
-      --disabled --query "$INITIAL_QUERY" \
+    --bind "change:reload:sleep 0.1; $RG_PREFIX {q} || true" \
-      --bind "change:reload:sleep 0.1; $RG_PREFIX {q} || true" \
+    --bind "ctrl-f:unbind(change,ctrl-f)+change-prompt(2. fzf> )+enable-search+rebind(ctrl-r)+transform-query(echo {q} > /tmp/rg-fzf-r; cat /tmp/rg-fzf-f)" \
-      --bind "ctrl-f:unbind(change,ctrl-f)+change-prompt(2. fzf> )+enable-search+clear-query+rebind(ctrl-r)" \
+    --bind "ctrl-r:unbind(ctrl-r)+change-prompt(1. ripgrep> )+disable-search+reload($RG_PREFIX {q} || true)+rebind(change,ctrl-f)+transform-query(echo {q} > /tmp/rg-fzf-f; cat /tmp/rg-fzf-r)" \
-      --bind "ctrl-r:unbind(ctrl-r)+change-prompt(1. ripgrep> )+disable-search+reload($RG_PREFIX {q} || true)+rebind(change,ctrl-f)" \
+    --bind "start:unbind(ctrl-r)" \
-      --prompt '1. Ripgrep> ' \
+    --prompt '1. ripgrep> ' \
-      --delimiter : \
+    --delimiter : \
-      --header '╱ CTRL-R (Ripgrep mode) ╱ CTRL-F (fzf mode) ╱' \
+    --header '╱ CTRL-R (ripgrep mode) ╱ CTRL-F (fzf mode) ╱' \
-      --preview 'bat --color=always {1} --highlight-line {2}' \
+    --preview 'bat --color=always {1} --highlight-line {2}' \
-      --preview-window 'up,60%,border-bottom,+{2}+3/3,~3'
+    --preview-window 'up,60%,border-bottom,+{2}+3/3,~3' \
-)
+    --bind 'enter:become(vim {1} +{2})'
-[ -n "${selected[0]}" ] && vim "${selected[0]}" "+${selected[1]}"
 ```
 
+- To restore the query string when switching between modes, we store the
+  current query in `/tmp/rg-fzf-{r,f}` files and restore the query using
+  `transform-query` action which was added in [fzf 0.36.0][0.36.0].
+- Also note that we unbind `ctrl-r` binding on `start` event which is
+  triggered once when fzf starts.
+
+[0.30.0]: https://github.com/junegunn/fzf/blob/master/CHANGELOG.md#0300
+[0.36.0]: https://github.com/junegunn/fzf/blob/master/CHANGELOG.md#0360
+
 Log tailing
 -----------
 

CHANGELOG.md

@@ -1,6 +1,96 @@
 CHANGELOG
 =========
 
+0.40.0
+------
+- Added `zero` event that is triggered when there's no match
+  ```sh
+  # Reload the candidate list when there's no match
+  echo $RANDOM | fzf --bind 'zero:reload(echo $RANDOM)+clear-query' --height 3
+  ```
+- New actions
+    - Added `track` action which makes fzf track the current item when the
+      search result is updated. If the user manually moves the cursor, or the
+      item is not in the updated search result, tracking is automatically
+      disabled. Tracking is useful when you want to see the surrounding items
+      by deleting the query string.
+      ```sh
+      # Narrow down the list with a query, point to a command,
+      # and hit CTRL-T to see its surrounding commands.
+      export FZF_CTRL_R_OPTS="
+        --preview 'echo {}' --preview-window up:3:hidden:wrap
+        --bind 'ctrl-/:toggle-preview'
+        --bind 'ctrl-t:track+clear-query'
+        --bind 'ctrl-y:execute-silent(echo -n {2..} | pbcopy)+abort'
+        --color header:italic
+        --header 'Press CTRL-Y to copy command into clipboard'"
+      ```
+    - Added `change-header(...)`
+    - Added `transform-header(...)`
+    - Added `toggle-track` action
+- Fixed `--track` behavior when used with `--tac`
+    - However, using `--track` with `--tac` is not recommended. The resulting
+      behavior can be very confusing.
+- Bug fixes and improvements
+
+0.39.0
+------
+- Added `one` event that is triggered when there's only one match
+  ```sh
+  # Automatically select the only match
+  seq 10 | fzf --bind one:accept
+  ```
+- Added `--track` option that makes fzf track the current selection when the
+  result list is updated. This can be useful when browsing logs using fzf with
+  sorting disabled.
+  ```sh
+  git log --oneline --graph --color=always | nl |
+      fzf --ansi --track --no-sort --layout=reverse-list
+  ```
+- If you use `--listen` option without a port number fzf will automatically
+  allocate an available port and export it as `$FZF_PORT` environment
+  variable.
+  ```sh
+  # Automatic port assignment
+  fzf --listen --bind 'start:execute-silent:echo $FZF_PORT > /tmp/fzf-port'
+
+  # Say hello
+  curl "localhost:$(cat /tmp/fzf-port)" -d 'preview:echo Hello, fzf is listening on $FZF_PORT.'
+  ```
+- A carriage return and a line feed character will be rendered as dim ␍ and
+  ␊ respectively.
+  ```sh
+  printf "foo\rbar\nbaz" | fzf --read0 --preview 'echo {}'
+  ```
+- fzf will stop rendering a non-displayable characters as a space. This will
+  likely cause less glitches in the preview window.
+  ```sh
+  fzf --preview 'head -1000 /dev/random'
+  ```
+- Bug fixes and improvements
+
+0.38.0
+------
+- New actions
+    - `become(...)` - Replace the current fzf process with the specified
+      command using `execve(2)` system call.
+      See https://github.com/junegunn/fzf#turning-into-a-different-process for
+      more information.
+      ```sh
+      # Open selected files in Vim
+      fzf --multi --bind 'enter:become(vim {+})'
+
+      # Open the file in Vim and go to the line
+      git grep --line-number . |
+          fzf --delimiter : --nth 3.. --bind 'enter:become(vim {1} +{2})'
+      ```
+        - This action is not supported on Windows
+    - `show-preview`
+    - `hide-preview`
+- Bug fixes
+    - `--preview-window 0,hidden` should not execute the preview command until
+      `toggle-preview` action is triggered
+
 0.37.0
 ------
 - Added a way to customize the separator of inline info
@@ -118,7 +208,7 @@ CHANGELOG
 - Added color name `preview-label` for `--preview-label` (defaults to `label`
   for `--border-label`)
 - Better support for (Windows) terminals where each box-drawing character
-  takes 2 columns. Set `RUNEWIDTH_EASTASIAN` environment variable to `1`.
+  takes 2 columns. Set `RUNEWIDTH_EASTASIAN` environment variable to `0` or `1`.
     - On Vim, the variable will be automatically set if `&ambiwidth` is `double`
 - Behavior changes
     - fzf will always execute the preview command if the command template

Makefile

@@ -20,7 +20,7 @@ VERSION_REGEX  := $(subst .,\.,$(VERSION_TRIM))
 ifdef FZF_REVISION
 REVISION       := $(FZF_REVISION)
 else
-REVISION       := $(shell git log -n 1 --pretty=format:%h -- $(SOURCES) 2> /dev/null)
+REVISION       := $(shell git log -n 1 --pretty=format:%h --abbrev=8 -- $(SOURCES) 2> /dev/null)
 endif
 ifeq ($(REVISION),)
 $(error Not on git repository; cannot determine $$FZF_REVISION)
@@ -29,6 +29,7 @@ BUILD_FLAGS    := -a -ldflags "-s -w -X main.version=$(VERSION) -X main.revision
 
 BINARY32       := fzf-$(GOOS)_386
 BINARY64       := fzf-$(GOOS)_amd64
+BINARYS390     := fzf-$(GOOS)_s390x
 BINARYARM5     := fzf-$(GOOS)_arm5
 BINARYARM6     := fzf-$(GOOS)_arm6
 BINARYARM7     := fzf-$(GOOS)_arm7
@@ -43,6 +44,8 @@ ifeq ($(UNAME_M),x86_64)
 	BINARY := $(BINARY64)
 else ifeq ($(UNAME_M),amd64)
 	BINARY := $(BINARY64)
+else ifeq ($(UNAME_M),s390x)
+	BINARY := $(BINARYS390)
 else ifeq ($(UNAME_M),i686)
 	BINARY := $(BINARY32)
 else ifeq ($(UNAME_M),i386)
@@ -132,6 +135,8 @@ target/$(BINARY32): $(SOURCES)
 target/$(BINARY64): $(SOURCES)
 	GOARCH=amd64 $(GO) build $(BUILD_FLAGS) -o $@
 
+target/$(BINARYS390): $(SOURCES)
+	GOARCH=s390x $(GO) build $(BUILD_FLAGS) -o $@
 # https://github.com/golang/go/wiki/GoArm
 target/$(BINARYARM5): $(SOURCES)
 	GOARCH=arm GOARM=5 $(GO) build $(BUILD_FLAGS) -o $@

README-VIM.md

@@ -15,7 +15,7 @@ set rtp+=/usr/local/opt/fzf
 " If installed using Homebrew on Apple Silicon
 set rtp+=/opt/homebrew/opt/fzf
 
-" If installed using git
+" If you have cloned fzf on ~/.fzf directory
 set rtp+=~/.fzf
 ```
 
@@ -26,7 +26,7 @@ written as:
 " If installed using Homebrew
 Plug '/usr/local/opt/fzf'
 
-" If installed using git
+" If you have cloned fzf on ~/.fzf directory
 Plug '~/.fzf'
 ```
 
@@ -118,7 +118,7 @@ let g:fzf_action = {
 
 " An action can be a reference to a function that processes selected lines
 function! s:build_quickfix_list(lines)
-  call setqflist(map(copy(a:lines), '{ "filename": v:val }'))
+  call setqflist(map(copy(a:lines), '{ "filename": v:val, "lnum": 1 }'))
   copen
   cc
 endfunction

README.md

@@ -54,14 +54,15 @@ Table of Contents
 * [Advanced topics](#advanced-topics)
     * [Performance](#performance)
     * [Executing external programs](#executing-external-programs)
+    * [Turning into a different process](#turning-into-a-different-process)
     * [Reloading the candidate list](#reloading-the-candidate-list)
         * [1. Update the list of processes by pressing CTRL-R](#1-update-the-list-of-processes-by-pressing-ctrl-r)
         * [2. Switch between sources by pressing CTRL-D or CTRL-F](#2-switch-between-sources-by-pressing-ctrl-d-or-ctrl-f)
         * [3. Interactive ripgrep integration](#3-interactive-ripgrep-integration)
     * [Preview window](#preview-window)
 * [Tips](#tips)
-        * [Respecting `.gitignore`](#respecting-gitignore)
+    * [Respecting `.gitignore`](#respecting-gitignore)
-        * [Fish shell](#fish-shell)
+    * [Fish shell](#fish-shell)
 * [Related projects](#related-projects)
 * [License](#license)
 
@@ -123,6 +124,7 @@ git clone --depth 1 https://github.com/junegunn/fzf.git ~/.fzf
 | pkg             | FreeBSD                 | `pkg install fzf`                  |
 | pkgin           | NetBSD                  | `pkgin install fzf`                |
 | pkg_add         | OpenBSD                 | `pkg_add fzf`                      |
+| Portage         | Gentoo                  | `emerge --ask app-shells/fzf`      |
 | XBPS            | Void Linux              | `sudo xbps-install -S fzf`         |
 | Zypper          | openSUSE                | `sudo zypper install fzf`          |
 
@@ -136,15 +138,17 @@ git clone --depth 1 https://github.com/junegunn/fzf.git ~/.fzf
 ### Windows
 
 Pre-built binaries for Windows can be downloaded [here][bin]. fzf is also
-available via [Chocolatey][choco] and [Scoop][scoop]:
+available via [Chocolatey][choco], [Scoop][scoop], and [Winget][winget]:
 
-| Package manager | Command             |
+| Package manager | Command              |
-| ---             | ---                 |
+| ---             | ---                  |
-| Chocolatey      | `choco install fzf` |
+| Chocolatey      | `choco install fzf`  |
-| Scoop           | `scoop install fzf` |
+| Scoop           | `scoop install fzf`  |
+| Winget          | `winget install fzf` |
 
 [choco]: https://chocolatey.org/packages/fzf
 [scoop]: https://github.com/ScoopInstaller/Main/blob/master/bucket/fzf.json
+[winget]: https://github.com/microsoft/winget-pkgs/tree/master/manifests/j/junegunn/fzf
 
 Known issues and limitations on Windows can be found on [the wiki
 page][windows-wiki].
@@ -202,6 +206,22 @@ files excluding hidden ones. (You can override the default command with
 vim $(fzf)
 ```
 
+> *:bulb: A more robust solution would be to use `xargs` but we've presented
+> the above as it's easier to grasp*
+> ```sh
+> fzf --print0 | xargs -0 -o vim
+> ```
+
+>
+> *:bulb: fzf also has the ability to turn itself into a different process.*
+>
+> ```sh
+> fzf --bind 'enter:become(vim {})'
+> ```
+>
+> *See [Turning into a different process](#turning-into-a-different-process)
+> for more information.*
+
 ### Using the finder
 
 - `CTRL-K` / `CTRL-J` (or `CTRL-P` / `CTRL-N`) to move cursor up and down
@@ -560,6 +580,47 @@ fzf --bind 'f1:execute(less -f {}),ctrl-y:execute-silent(echo {} | pbcopy)+abort
 
 See *KEY BINDINGS* section of the man page for details.
 
+### Turning into a different process
+
+`become(...)` is similar to `execute(...)`/`execute-silent(...)` described
+above, but instead of executing the command and coming back to fzf on
+complete, it turns fzf into a new process for the command.
+
+```sh
+fzf --bind 'enter:become(vim {})'
+```
+
+Compared to the seemingly equivalent command substitution `vim "$(fzf)"`, this
+approach has several advantages:
+
+* Vim will not open an empty file when you terminate fzf with
+  <kbd>CTRL-C</kbd>
+* Vim will not open an empty file when you press <kbd>ENTER</kbd> on an empty
+  result
+* Can handle multiple selections even when they have whitespaces
+  ```sh
+  fzf --multi --bind 'enter:become(vim {+})'
+  ```
+
+To be fair, running `fzf --print0 | xargs -0 -o vim` instead of `vim "$(fzf)"`
+resolves all of the issues mentioned. Nonetheless, `become(...)` still offers
+additional benefits in different scenarios.
+
+* You can set up multiple bindings to handle the result in different ways
+  without any wrapping script
+  ```sh
+  fzf --bind 'enter:become(vim {}),ctrl-e:become(emacs {})'
+  ```
+  * Previously, you would have to use `--expect=ctrl-e` and check the first
+    line of the output of fzf
+* You can easily build the subsequent command using the field index
+  expressions of fzf
+  ```sh
+  # Open the file in Vim and go to the line
+  git grep --line-number . |
+      fzf --delimiter : --nth 3.. --bind 'enter:become(vim {1} +{2})'
+  ```
+
 ### Reloading the candidate list
 
 By binding `reload` action to a key or an event, you can make fzf dynamically
@@ -663,7 +724,7 @@ history | fzf
 Tips
 ----
 
-#### Respecting `.gitignore`
+### Respecting `.gitignore`
 
 You can use [fd](https://github.com/sharkdp/fd),
 [ripgrep](https://github.com/BurntSushi/ripgrep), or [the silver
@@ -692,7 +753,7 @@ hidden files, use the following command:
 export FZF_DEFAULT_COMMAND='fd --type f --strip-cwd-prefix --hidden --follow --exclude .git'
 ```
 
-#### Fish shell
+### Fish shell
 
 `CTRL-T` key binding of fish, unlike those of bash and zsh, will use the last
 token on the command-line as the root directory for the recursive search. For

bin/fzf-tmux

@@ -179,11 +179,15 @@ trap 'cleanup' EXIT
 
 envs="export TERM=$TERM "
 if [[ "$opt" =~ "-E" ]]; then
-  FZF_DEFAULT_OPTS="--margin 0,1 $FZF_DEFAULT_OPTS"
+  tmux_version=$(tmux -V | sed 's/[^0-9.]//g')
-  tmux_version=$(tmux -V)
+  if [[ $(awk '{print ($1 > 3.2)}' <<< "$tmux_version" 2> /dev/null || bc -l <<< "$tmux_version > 3.2") = 1 ]]; then
-  if [[ ! $tmux_version =~ 3\.2 ]]; then
     FZF_DEFAULT_OPTS="--border $FZF_DEFAULT_OPTS"
     opt="-B $opt"
+  elif [[ $tmux_version = 3.2 ]]; then
+    FZF_DEFAULT_OPTS="--margin 0,1 $FZF_DEFAULT_OPTS"
+  else
+    echo "fzf-tmux: tmux 3.2 or above is required for popup mode" >&2
+    exit 2
   fi
 fi
 [[ -n "$FZF_DEFAULT_OPTS"    ]] && envs="$envs FZF_DEFAULT_OPTS=$(printf %q "$FZF_DEFAULT_OPTS")"

doc/fzf.txt

@@ -1,4 +1,4 @@
-fzf.txt	fzf	Last change: May 19 2021
+fzf.txt	fzf	Last change: Mar 20 2023
 FZF - TABLE OF CONTENTS                                            *fzf* *fzf-toc*
 ==============================================================================
 
@@ -32,7 +32,7 @@ depending on the package manager.
     " If installed using Homebrew
     set rtp+=/usr/local/opt/fzf
 
-    " If installed using git
+    " If you have cloned fzf on ~/.fzf directory
     set rtp+=~/.fzf
 <
 If you use {vim-plug}{1}, the same can be written as:
@@ -40,7 +40,7 @@ If you use {vim-plug}{1}, the same can be written as:
     " If installed using Homebrew
     Plug '/usr/local/opt/fzf'
 
-    " If installed using git
+    " If you have cloned fzf on ~/.fzf directory
     Plug '~/.fzf'
 <
 But if you want the latest Vim plugin file from GitHub rather than the one
@@ -143,7 +143,7 @@ Examples~
 
     " An action can be a reference to a function that processes selected lines
     function! s:build_quickfix_list(lines)
-      call setqflist(map(copy(a:lines), '{ "filename": v:val }'))
+      call setqflist(map(copy(a:lines), '{ "filename": v:val, "lnum": 1 }'))
       copen
       cc
     endfunction

go.mod

@@ -5,10 +5,10 @@ require (
 	github.com/mattn/go-isatty v0.0.17
 	github.com/mattn/go-runewidth v0.0.14
 	github.com/mattn/go-shellwords v1.0.12
-	github.com/rivo/uniseg v0.4.2
+	github.com/rivo/uniseg v0.4.4
 	github.com/saracen/walker v0.1.3
-	golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab
+	golang.org/x/sys v0.7.0
-	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211
+	golang.org/x/term v0.7.0
 )
 
 require (

go.sum

@@ -11,8 +11,8 @@ github.com/mattn/go-runewidth v0.0.14/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh
 github.com/mattn/go-shellwords v1.0.12 h1:M2zGm7EW6UQJvDeQxo4T51eKPurbeFbe8WtebGE2xrk=
 github.com/mattn/go-shellwords v1.0.12/go.mod h1:EZzvwXDESEeg03EKmM+RmDnNOPKG4lLtQsUlTZDWQ8Y=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
-github.com/rivo/uniseg v0.4.2 h1:YwD0ulJSJytLpiaWua0sBDusfsCZohxjxzVTYjwxfV8=
+github.com/rivo/uniseg v0.4.4 h1:8TfxU8dW6PdqD27gjM8MVNuicgxIjxpm4K7x4jp8sis=
-github.com/rivo/uniseg v0.4.2/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
+github.com/rivo/uniseg v0.4.4/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
 github.com/saracen/walker v0.1.3 h1:YtcKKmpRPy6XJTHJ75J2QYXXZYWnZNQxPCVqZSHVV/g=
 github.com/saracen/walker v0.1.3/go.mod h1:FU+7qU8DeQQgSZDmmThMJi93kPkLFgy0oVAcLxurjIk=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
@@ -31,11 +31,13 @@ golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab h1:2QkjZIsXupsJbJIdSjjUOgWK3aEtzyuh2mPt3l/CkeU=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
+golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.7.0 h1:BEvjmm5fURWqcfbSKTdpkDXYBrUS1c0m8agp14W48vQ=
+golang.org/x/term v0.7.0/go.mod h1:P32HKFT3hSsZrRxla30E9HqToFYAQPCMs/zFMBUFqPY=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=

install

@@ -2,7 +2,7 @@
 
 set -u
 
-version=0.37.0
+version=0.40.0
 auto_completion=
 key_bindings=
 update_config=2
@@ -178,6 +178,7 @@ case "$archi" in
   Linux\ loongarch64) download fzf-$version-linux_loong64.tar.gz ;;
   Linux\ ppc64le)     download fzf-$version-linux_ppc64le.tar.gz ;;
   Linux\ *64)         download fzf-$version-linux_amd64.tar.gz   ;;
+  Linux\ s390x)       download fzf-$version-linux_s390x.tar.gz   ;;
   FreeBSD\ *64)       download fzf-$version-freebsd_amd64.tar.gz ;;
   OpenBSD\ *64)       download fzf-$version-openbsd_amd64.tar.gz ;;
   CYGWIN*\ *64)       download fzf-$version-windows_amd64.zip    ;;

install.ps1

@@ -1,4 +1,4 @@
-$version="0.37.0"
+$version="0.40.0"
 
 $fzf_base=Split-Path -Parent $MyInvocation.MyCommand.Definition
 

main.go

@@ -5,7 +5,7 @@ import (
 	"github.com/junegunn/fzf/src/protector"
 )
 
-var version string = "0.37"
+var version string = "0.40"
 var revision string = "devel"
 
 func main() {

man/man1/fzf-tmux.1

@@ -21,7 +21,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ..
-.TH fzf-tmux 1 "Jan 2023" "fzf 0.37.0" "fzf-tmux - open fzf in tmux split pane"
+.TH fzf-tmux 1 "May 2023" "fzf 0.40.0" "fzf-tmux - open fzf in tmux split pane"
 
 .SH NAME
 fzf-tmux - open fzf in tmux split pane

man/man1/fzf.1

@@ -21,7 +21,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ..
-.TH fzf 1 "Jan 2023" "fzf 0.37.0" "fzf - a command-line fuzzy finder"
+.TH fzf 1 "May 2023" "fzf 0.40.0" "fzf - a command-line fuzzy finder"
 
 .SH NAME
 fzf - a command-line fuzzy finder
@@ -92,6 +92,19 @@ interface rather than a "fuzzy finder". You can later enable the search using
 .B "+s, --no-sort"
 Do not sort the result
 .TP
+.B "--track"
+Make fzf track the current selection when the result list is updated.
+This can be useful when browsing logs using fzf with sorting disabled. It is
+not recommended to use this option with \fB--tac\fR as the resulting behavior
+can be confusing. Also, consider using \fBtrack\fR action instead of this
+option.
+
+.RS
+e.g.
+     \fBgit log --oneline --graph --color=always | nl |
+         fzf --ansi --track --no-sort --layout=reverse-list\fR
+.RE
+.TP
 .B "--tac"
 Reverse the order of the input
 
@@ -231,8 +244,9 @@ Draw border around the finder
 .br
 
 If you use a terminal emulator where each box-drawing character takes
-2 columns, try setting \fBRUNEWIDTH_EASTASIAN\fR to \fB1\fR. If the border is
+2 columns, try setting \fBRUNEWIDTH_EASTASIAN\fR environment variable to
-still not properly rendered, set \fB--no-unicode\fR.
+\fB0\fR or \fB1\fR. If the border is still not properly rendered, set
+\fB--no-unicode\fR.
 
 .TP
 .BI "--border-label" [=LABEL]
@@ -738,9 +752,12 @@ ncurses finder only after the input stream is complete.
 e.g. \fBfzf --multi | fzf --sync\fR
 .RE
 .TP
-.B "--listen=HTTP_PORT"
+.B "--listen[=HTTP_PORT]"
 Start HTTP server on the given port. It allows external processes to send
-actions to perform via POST method.
+actions to perform via POST method. If the port number is omitted or given as
+0, fzf will choose the port automatically and export it as \fBFZF_PORT\fR
+environment variable to the child processes started via \fBexecute\fR and
+\fBexecute-silent\fR actions.
 
 e.g.
      \fB# Start HTTP server on port 6266
@@ -748,6 +765,9 @@ e.g.
 
      # Send action to the server
      curl -XPOST localhost:6266 -d 'reload(seq 100)+change-prompt(hundred> )'
+
+     # Choose port automatically and export it as $FZF_PORT to the child process
+     fzf --listen --bind 'start:execute-silent:echo $FZF_PORT > /tmp/fzf-port'
      \fR
 .TP
 .B "--version"
@@ -977,6 +997,28 @@ e.g.
      # Beware not to introduce an infinite loop
      seq 10 | fzf --bind 'focus:up' --cycle\fR
 .RE
+\fIone\fR
+.RS
+Triggered when there's only one match. \fBone:accept\fR binding is comparable
+to \fB--select-1\fR option, but the difference is that \fB--select-1\fR is only
+effective before the interactive finder starts but \fBone\fR event is triggered
+by the interactive finder.
+
+e.g.
+     \fB# Automatically select the only match
+     seq 10 | fzf --bind one:accept\fR
+.RE
+\fIzero\fR
+.RS
+Triggered when there's no match. \fBzero:abort\fR binding is comparable to
+\fB--exit-0\fR option, but the difference is that \fB--exit-0\fR is only
+effective before the interactive finder starts but \fBzero\fR event is
+triggered by the interactive finder.
+
+e.g.
+     \fB# Reload the candidate list when there's no match
+     echo $RANDOM | fzf --bind 'zero:reload(echo $RANDOM)+clear-query' --height 3\fR
+.RE
 
 \fIbackward-eof\fR
 .RS
@@ -999,9 +1041,11 @@ A key or an event can be bound to one or more of the following actions.
     \fBbackward-delete-char/eof\fR     (same as \fBbackward-delete-char\fR except aborts fzf if query is empty)
     \fBbackward-kill-word\fR           \fIalt-bs\fR
     \fBbackward-word\fR                \fIalt-b   shift-left\fR
+    \fBbecome(...)\fR                  (replace fzf process with the specified command; see below for the details)
     \fBbeginning-of-line\fR            \fIctrl-a  home\fR
     \fBcancel\fR                       (clear query string if not empty, abort fzf otherwise)
     \fBchange-border-label(...)\fR     (change \fB--border-label\fR to the given string)
+    \fBchange-header(...)\fR           (change header to the given string; doesn't affect \fB--header-lines\fR)
     \fBchange-preview(...)\fR          (change \fB--preview\fR option)
     \fBchange-preview-label(...)\fR    (change \fB--preview-label\fR to the given string)
     \fBchange-preview-window(...)\fR   (change \fB--preview-window\fR option; rotate through the multiple option sets separated by '|')
@@ -1036,6 +1080,7 @@ A key or an event can be bound to one or more of the following actions.
     \fBpage-up\fR                      \fIpgup\fR
     \fBhalf-page-down\fR
     \fBhalf-page-up\fR
+    \fBhide-preview\fR
     \fBpos(...)\fR                     (move cursor to the numeric position; negative number to count from the end)
     \fBprev-history\fR                 (\fIctrl-p\fR on \fB--history\fR)
     \fBprev-selected\fR                (move to the previous selected item)
@@ -1058,6 +1103,7 @@ A key or an event can be bound to one or more of the following actions.
     \fBreplace-query\fR                (replace query string with the current selection)
     \fBselect\fR
     \fBselect-all\fR                   (select all matches)
+    \fBshow-preview\fR
     \fBtoggle\fR                       (\fIright-click\fR)
     \fBtoggle-all\fR                   (toggle all matches)
     \fBtoggle+down\fR                  \fIctrl-i  (tab)\fR
@@ -1067,8 +1113,11 @@ A key or an event can be bound to one or more of the following actions.
     \fBtoggle-preview-wrap\fR
     \fBtoggle-search\fR                (toggle search functionality)
     \fBtoggle-sort\fR
+    \fBtoggle-track\fR
     \fBtoggle+up\fR                    \fIbtab    (shift-tab)\fR
+    \fBtrack\fR                        (track the current item; automatically disabled if focus changes)
     \fBtransform-border-label(...)\fR  (transform border label using an external command)
+    \fBtransform-header(...)\fR        (transform header using an external command)
     \fBtransform-preview-label(...)\fR (transform preview label using an external command)
     \fBtransform-prompt(...)\fR        (transform prompt string using an external command)
     \fBtransform-query(...)\fR         (transform query string using an external command)
@@ -1141,6 +1190,14 @@ On *nix systems, fzf runs the command with \fB$SHELL -c\fR if \fBSHELL\fR is
 set, otherwise with \fBsh -c\fR, so in this case make sure that the command is
 POSIX-compliant.
 
+\fBbecome(...)\fR action is similar to \fBexecute(...)\fR, but it replaces the
+current fzf process with the specified command using \fBexecve(2)\fR system
+call.
+
+    \fBfzf --bind "enter:become(vim {})"\fR
+
+\fBbecome(...)\fR is not supported on Windows.
+
 .SS RELOAD INPUT
 
 \fBreload(...)\fR action is used to dynamically update the input list

plugin/fzf.vim

@@ -164,7 +164,7 @@ function s:get_version(bin)
   if has_key(s:versions, a:bin)
     return s:versions[a:bin]
   end
-  let command = (&shell =~ 'powershell' ? '&' : '') . s:fzf_call('shellescape', a:bin) . ' --version --no-height'
+  let command = (&shell =~ 'powershell\|pwsh' ? '&' : '') . s:fzf_call('shellescape', a:bin) . ' --version --no-height'
   let output = systemlist(command)
   if v:shell_error || empty(output)
     return ''
@@ -512,9 +512,7 @@ try
     let optstr .= ' --height='.height
   endif
   " Respect --border option given in 'options'
-  if stridx(optstr, '--border') < 0 && stridx(optstr, '--no-border') < 0
+  let optstr = join([s:border_opt(get(dict, 'window', 0)), optstr])
-    let optstr .= s:border_opt(get(dict, 'window', 0))
-  endif
   let prev_default_command = $FZF_DEFAULT_COMMAND
   if len(source_command)
     let $FZF_DEFAULT_COMMAND = source_command
@@ -741,7 +739,7 @@ function! s:calc_size(max, val, dict)
     return size
   endif
   let margin = match(opts, '--inline-info\|--info[^-]\{-}inline') > match(opts, '--no-inline-info\|--info[^-]\{-}\(default\|hidden\)') ? 1 : 2
-  let margin += stridx(opts, '--border') > stridx(opts, '--no-border') ? 2 : 0
+  let margin += match(opts, '--border\([^-]\|$\)') > match(opts, '--no-border\([^-]\|$\)') ? 2 : 0
   if stridx(opts, '--header') > stridx(opts, '--no-header')
     let margin += len(split(opts, "\n"))
   endif

shell/completion.bash

@@ -270,8 +270,9 @@ _fzf_complete_kill() {
 }
 
 _fzf_proc_completion() {
-  _fzf_complete -m --preview 'echo {}' --preview-window down:3:wrap --min-height 15 -- "$@" < <(
+  _fzf_complete -m --header-lines=1 --preview 'echo {}' --preview-window down:3:wrap --min-height 15 -- "$@" < <(
-    command ps -ef | sed 1d
+    command ps -eo user,pid,ppid,start,time,command 2> /dev/null ||
+      command ps -eo user,pid,ppid,time,args # For BusyBox
   )
 }
 
@@ -309,7 +310,7 @@ complete -o default -F _fzf_opts_completion fzf-tmux
 
 d_cmds="${FZF_COMPLETION_DIR_COMMANDS:-cd pushd rmdir}"
 a_cmds="
-  awk cat diff diff3
+  awk bat cat diff diff3
   emacs emacsclient ex file ftp g++ gcc gvim head hg hx java
   javac ld less more mvim nvim patch perl python ruby
   sed sftp sort source tail tee uniq vi view vim wc xdg-open
@@ -373,7 +374,7 @@ _fzf_setup_completion() {
 }
 
 # Environment variables / Aliases / Hosts / Process
-_fzf_setup_completion 'var'   export unset
+_fzf_setup_completion 'var'   export unset printenv
 _fzf_setup_completion 'alias' unalias
 _fzf_setup_completion 'host'  ssh telnet
 _fzf_setup_completion 'proc'  kill

shell/completion.zsh

@@ -251,8 +251,9 @@ _fzf_complete_unalias() {
 }
 
 _fzf_complete_kill() {
-  _fzf_complete -m --preview 'echo {}' --preview-window down:3:wrap --min-height 15 -- "$@" < <(
+  _fzf_complete -m --header-lines=1 --preview 'echo {}' --preview-window down:3:wrap --min-height 15 -- "$@" < <(
-    command ps -ef | sed 1d
+    command ps -eo user,pid,ppid,start,time,command 2> /dev/null ||
+      command ps -eo user,pid,ppid,time,args # For BusyBox
   )
 }
 

src/core.go

@@ -219,6 +219,7 @@ func Run(opts *Options, version string, revision string) {
 	determine := func(final bool) {
 		if heightUnknown {
 			if total >= maxFit || final {
+				deferred = false
 				heightUnknown = false
 				terminal.startChan <- fitpad{util.Min(total, maxFit), padHeight}
 			}
@@ -298,10 +299,12 @@ func Run(opts *Options, version string, revision string) {
 
 				case EvtSearchNew:
 					var command *string
+					var changed bool
 					switch val := value.(type) {
 					case searchRequest:
 						sort = val.sort
 						command = val.command
+						changed = val.changed
 						if command != nil {
 							useSnapshot = val.sync
 						}
@@ -313,10 +316,17 @@ func Run(opts *Options, version string, revision string) {
 						} else {
 							restart(*command)
 						}
+					}
+					if !changed {
 						break
 					}
 					if !useSnapshot {
-						snapshot, _ = chunkList.Snapshot()
+						newSnapshot, _ := chunkList.Snapshot()
+						// We want to avoid showing empty list when reload is triggered
+						// and the query string is changed at the same time i.e. command != nil && changed
+						if command == nil || len(newSnapshot) > 0 {
+							snapshot = newSnapshot
+						}
 					}
 					reset := !useSnapshot && clearCache()
 					matcher.Reset(snapshot, input(reset), true, !reading, sort, reset)

src/merger.go

@@ -17,6 +17,7 @@ type Merger struct {
 	tac     bool
 	final   bool
 	count   int
+	pass    bool
 }
 
 // PassMerger returns a new Merger that simply returns the items in the
@@ -26,7 +27,8 @@ func PassMerger(chunks *[]*Chunk, tac bool) *Merger {
 		pattern: nil,
 		chunks:  chunks,
 		tac:     tac,
-		count:   0}
+		count:   0,
+		pass:    true}
 
 	for _, chunk := range *mg.chunks {
 		mg.count += chunk.count
@@ -58,6 +60,32 @@ func (mg *Merger) Length() int {
 	return mg.count
 }
 
+func (mg *Merger) First() Result {
+	if mg.tac && !mg.sorted {
+		return mg.Get(mg.count - 1)
+	}
+	return mg.Get(0)
+}
+
+// FindIndex returns the index of the item with the given item index
+func (mg *Merger) FindIndex(itemIndex int32) int {
+	index := -1
+	if mg.pass {
+		index = int(itemIndex)
+		if mg.tac {
+			index = mg.count - index - 1
+		}
+	} else {
+		for i := 0; i < mg.count; i++ {
+			if mg.Get(i).item.Index() == itemIndex {
+				index = i
+				break
+			}
+		}
+	}
+	return index
+}
+
 // Get returns the pointer to the Result object indexed by the given integer
 func (mg *Merger) Get(idx int) Result {
 	if mg.chunks != nil {

src/options.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/junegunn/fzf/src/algo"
 	"github.com/junegunn/fzf/src/tui"
+	"github.com/junegunn/fzf/src/util"
 
 	"github.com/mattn/go-runewidth"
 	"github.com/mattn/go-shellwords"
@@ -32,6 +33,7 @@ const usage = `usage: fzf [options]
                            field index expressions
     -d, --delimiter=STR    Field delimiter regex (default: AWK-style)
     +s, --no-sort          Do not sort the result
+    --track                Track the current selection when the result is updated
     --tac                  Reverse the order of the input
     --disabled             Do not perform search
     --tiebreak=CRI[,..]    Comma-separated list of sort criteria to apply
@@ -115,7 +117,7 @@ const usage = `usage: fzf [options]
     --read0                Read input delimited by ASCII NUL characters
     --print0               Print output delimited by ASCII NUL characters
     --sync                 Synchronous search for multi-staged filtering
-    --listen=HTTP_PORT     Start HTTP server to receive actions (POST /)
+    --listen[=HTTP_PORT]   Start HTTP server to receive actions (POST /)
     --version              Display version information and exit
 
   Environment variables
@@ -163,6 +165,14 @@ func defaultMargin() [4]sizeSpec {
 	return [4]sizeSpec{}
 }
 
+type trackOption int
+
+const (
+	trackDisabled trackOption = iota
+	trackEnabled
+	trackCurrent
+)
+
 type windowPosition int
 
 const (
@@ -265,6 +275,7 @@ type Options struct {
 	WithNth      []Range
 	Delimiter    Delimiter
 	Sort         int
+	Track        trackOption
 	Tac          bool
 	Criteria     []criterion
 	Multi        int
@@ -315,7 +326,7 @@ type Options struct {
 	PreviewLabel labelOpts
 	Unicode      bool
 	Tabstop      int
-	ListenPort   int
+	ListenPort   *int
 	ClearOnExit  bool
 	Version      bool
 }
@@ -337,6 +348,7 @@ func defaultOptions() *Options {
 		WithNth:      make([]Range, 0),
 		Delimiter:    Delimiter{},
 		Sort:         1000,
+		Track:        trackDisabled,
 		Tac:          false,
 		Criteria:     []criterion{byScore, byLength},
 		Multi:        0,
@@ -618,6 +630,10 @@ func parseKeyChordsImpl(str string, message string, exit func(string)) map[tui.E
 			add(tui.Load)
 		case "focus":
 			add(tui.Focus)
+		case "one":
+			add(tui.One)
+		case "zero":
+			add(tui.Zero)
 		case "alt-enter", "alt-return":
 			chords[tui.CtrlAltKey('m')] = key
 		case "alt-space":
@@ -921,7 +937,7 @@ const (
 
 func init() {
 	executeRegexp = regexp.MustCompile(
-		`(?si)[:+](execute(?:-multi|-silent)?|reload(?:-sync)?|preview|(?:change|transform)-(?:query|prompt|border-label|preview-label)|change-preview-window|change-preview|(?:re|un)bind|pos|put)`)
+		`(?si)[:+](become|execute(?:-multi|-silent)?|reload(?:-sync)?|preview|(?:change|transform)-(?:header|query|prompt|border-label|preview-label)|change-preview-window|change-preview|(?:re|un)bind|pos|put)`)
 	splitRegexp = regexp.MustCompile("[,:]+")
 	actionNameRegexp = regexp.MustCompile("(?i)^[a-z-]+")
 }
@@ -1077,6 +1093,10 @@ func parseActionList(masked string, original string, prevActions []*action, putA
 			appendAction(actToggleAll)
 		case "toggle-search":
 			appendAction(actToggleSearch)
+		case "toggle-track":
+			appendAction(actToggleTrack)
+		case "track":
+			appendAction(actTrack)
 		case "select":
 			appendAction(actSelect)
 		case "select-all":
@@ -1111,6 +1131,10 @@ func parseActionList(masked string, original string, prevActions []*action, putA
 			appendAction(actPrevSelected)
 		case "next-selected":
 			appendAction(actNextSelected)
+		case "show-preview":
+			appendAction(actShowPreview)
+		case "hide-preview":
+			appendAction(actHidePreview)
 		case "toggle-preview":
 			appendAction(actTogglePreview)
 		case "toggle-preview-wrap":
@@ -1167,6 +1191,10 @@ func parseActionList(masked string, original string, prevActions []*action, putA
 					actions = append(actions, &action{t: t, a: actionArg})
 				}
 				switch t {
+				case actBecome:
+					if util.IsWindows() {
+						exit("become action is not supported on Windows")
+					}
 				case actUnbind, actRebind:
 					parseKeyChordsImpl(actionArg, spec[0:offset]+" target required", exit)
 				case actChangePreviewWindow:
@@ -1219,6 +1247,8 @@ func isExecuteAction(str string) actionType {
 
 	prefix := actionNameRegexp.FindString(str)
 	switch prefix {
+	case "become":
+		return actBecome
 	case "reload":
 		return actReload
 	case "reload-sync":
@@ -1231,6 +1261,8 @@ func isExecuteAction(str string) actionType {
 		return actPreview
 	case "change-border-label":
 		return actChangeBorderLabel
+	case "change-header":
+		return actChangeHeader
 	case "change-preview-label":
 		return actChangePreviewLabel
 	case "change-preview-window":
@@ -1255,6 +1287,8 @@ func isExecuteAction(str string) actionType {
 		return actTransformBorderLabel
 	case "transform-preview-label":
 		return actTransformPreviewLabel
+	case "transform-header":
+		return actTransformHeader
 	case "transform-prompt":
 		return actTransformPrompt
 	case "transform-query":
@@ -1551,6 +1585,10 @@ func parseOptions(opts *Options, allArgs []string) {
 			opts.Sort = optionalNumeric(allArgs, &i, 1)
 		case "+s", "--no-sort":
 			opts.Sort = 0
+		case "--track":
+			opts.Track = trackEnabled
+		case "--no-track":
+			opts.Track = trackDisabled
 		case "--tac":
 			opts.Tac = true
 		case "--no-tac":
@@ -1745,9 +1783,10 @@ func parseOptions(opts *Options, allArgs []string) {
 		case "--tabstop":
 			opts.Tabstop = nextInt(allArgs, &i, "tab stop required")
 		case "--listen":
-			opts.ListenPort = nextInt(allArgs, &i, "listen port required")
+			port := optionalNumeric(allArgs, &i, 0)
+			opts.ListenPort = &port
 		case "--no-listen":
-			opts.ListenPort = 0
+			opts.ListenPort = nil
 		case "--clear":
 			opts.ClearOnExit = true
 		case "--no-clear":
@@ -1838,7 +1877,8 @@ func parseOptions(opts *Options, allArgs []string) {
 			} else if match, value := optString(arg, "--tabstop="); match {
 				opts.Tabstop = atoi(value)
 			} else if match, value := optString(arg, "--listen="); match {
-				opts.ListenPort = atoi(value)
+				port := atoi(value)
+				opts.ListenPort = &port
 			} else if match, value := optString(arg, "--hscroll-off="); match {
 				opts.HscrollOff = atoi(value)
 			} else if match, value := optString(arg, "--scroll-off="); match {
@@ -1868,7 +1908,7 @@ func parseOptions(opts *Options, allArgs []string) {
 		errorExit("tab stop must be a positive integer")
 	}
 
-	if opts.ListenPort < 0 || opts.ListenPort > 65535 {
+	if opts.ListenPort != nil && (*opts.ListenPort < 0 || *opts.ListenPort > 65535) {
 		errorExit("invalid listen port")
 	}
 
@@ -1990,9 +2030,7 @@ func postProcessOptions(opts *Options) {
 		theme := opts.Theme
 		boldify := func(c tui.ColorAttr) tui.ColorAttr {
 			dup := c
-			if !theme.Colored {
+			if (c.Attr & tui.AttrRegular) == 0 {
-				dup.Attr |= tui.Bold
-			} else if (c.Attr & tui.AttrRegular) == 0 {
 				dup.Attr |= tui.Bold
 			}
 			return dup

src/server.go

@@ -19,14 +19,26 @@ const (
 	maxContentLength = 1024 * 1024
 )
 
-func startHttpServer(port int, channel chan []*action) error {
+func startHttpServer(port int, channel chan []*action) (error, int) {
-	if port == 0 {
+	if port < 0 {
-		return nil
+		return nil, port
 	}
 
 	listener, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", port))
 	if err != nil {
-		return fmt.Errorf("port not available: %d", port)
+		return fmt.Errorf("port not available: %d", port), port
+	}
+	if port == 0 {
+		addr := listener.Addr().String()
+		parts := strings.SplitN(addr, ":", 2)
+		if len(parts) < 2 {
+			return fmt.Errorf("cannot extract port: %s", addr), port
+		}
+		var err error
+		port, err = strconv.Atoi(parts[1])
+		if err != nil {
+			return err, port
+		}
 	}
 
 	go func() {
@@ -45,7 +57,7 @@ func startHttpServer(port int, channel chan []*action) error {
 		listener.Close()
 	}()
 
-	return nil
+	return nil, port
 }
 
 // Here we are writing a simplistic HTTP server without using net/http

src/terminal.go

@@ -3,9 +3,11 @@ package fzf
 import (
 	"bufio"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"math"
 	"os"
+	"os/exec"
 	"os/signal"
 	"regexp"
 	"sort"
@@ -104,7 +106,6 @@ type previewer struct {
 	version    int64
 	lines      []string
 	offset     int
-	enabled    bool
 	scrollable bool
 	final      bool
 	following  resumableState
@@ -183,6 +184,7 @@ type Terminal struct {
 	multi              int
 	sort               bool
 	toggleSort         bool
+	track              trackOption
 	delimiter          Delimiter
 	expect             map[tui.Event]string
 	keymap             map[tui.Event][]*action
@@ -201,9 +203,8 @@ type Terminal struct {
 	tabstop            int
 	margin             [4]sizeSpec
 	padding            [4]sizeSpec
-	strong             tui.Attr
 	unicode            bool
-	listenPort         int
+	listenPort         *int
 	borderShape        tui.BorderShape
 	cleanExit          bool
 	paused             bool
@@ -310,6 +311,7 @@ const (
 	actBackwardWord
 	actCancel
 	actChangeBorderLabel
+	actChangeHeader
 	actChangePreviewLabel
 	actChangePrompt
 	actChangeQuery
@@ -337,6 +339,8 @@ const (
 	actToggleUp
 	actToggleIn
 	actToggleOut
+	actToggleTrack
+	actTrack
 	actDown
 	actUp
 	actPageUp
@@ -350,9 +354,12 @@ const (
 	actRefreshPreview
 	actReplaceQuery
 	actToggleSort
+	actShowPreview
+	actHidePreview
 	actTogglePreview
 	actTogglePreviewWrap
 	actTransformBorderLabel
+	actTransformHeader
 	actTransformPreviewLabel
 	actTransformPrompt
 	actTransformQuery
@@ -386,6 +393,7 @@ const (
 	actDeselect
 	actUnbind
 	actRebind
+	actBecome
 )
 
 type placeholderFlags struct {
@@ -400,6 +408,7 @@ type searchRequest struct {
 	sort    bool
 	sync    bool
 	command *string
+	changed bool
 }
 
 type previewRequest struct {
@@ -535,13 +544,9 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 	}
 	var previewBox *util.EventBox
 	// We need to start previewer if HTTP server is enabled even when --preview option is not specified
-	if len(opts.Preview.command) > 0 || hasPreviewAction(opts) || opts.ListenPort > 0 {
+	if len(opts.Preview.command) > 0 || hasPreviewAction(opts) || opts.ListenPort != nil {
 		previewBox = util.NewEventBox()
 	}
-	strongAttr := tui.Bold
-	if !opts.Bold {
-		strongAttr = tui.AttrRegular
-	}
 	var renderer tui.Renderer
 	fullscreen := !opts.Height.auto && (opts.Height.size == 0 || opts.Height.percent && opts.Height.size == 100)
 	if fullscreen {
@@ -601,6 +606,7 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 		multi:              opts.Multi,
 		sort:               opts.Sort > 0,
 		toggleSort:         opts.ToggleSort,
+		track:              opts.Track,
 		delimiter:          opts.Delimiter,
 		expect:             opts.Expect,
 		keymap:             opts.Keymap,
@@ -620,11 +626,10 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 		previewLabelOpts:   opts.PreviewLabel,
 		cleanExit:          opts.ClearOnExit,
 		paused:             opts.Phony,
-		strong:             strongAttr,
 		cycle:              opts.Cycle,
 		headerFirst:        opts.HeaderFirst,
 		headerLines:        opts.HeaderLines,
-		header:             header,
+		header:             []string{},
 		header0:            header,
 		ellipsis:           opts.Ellipsis,
 		ansi:               opts.Ansi,
@@ -643,7 +648,7 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 		reqBox:             util.NewEventBox(),
 		initialPreviewOpts: opts.Preview,
 		previewOpts:        opts.Preview,
-		previewer:          previewer{0, []string{}, 0, len(opts.Preview.command) > 0, false, true, disabledState, "", []bool{}},
+		previewer:          previewer{0, []string{}, 0, false, true, disabledState, "", []bool{}},
 		previewed:          previewed{0, 0, 0, false},
 		previewBox:         previewBox,
 		eventBox:           eventBox,
@@ -691,13 +696,25 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 
 	_, t.hasLoadActions = t.keymap[tui.Load.AsEvent()]
 
-	if err := startHttpServer(t.listenPort, t.serverChan); err != nil {
+	if t.listenPort != nil {
-		errorExit(err.Error())
+		err, port := startHttpServer(*t.listenPort, t.serverChan)
+		if err != nil {
+			errorExit(err.Error())
+		}
+		t.listenPort = &port
 	}
 
 	return &t
 }
 
+func (t *Terminal) environ() []string {
+	env := os.Environ()
+	if t.listenPort != nil {
+		env = append(env, fmt.Sprintf("FZF_PORT=%d", *t.listenPort))
+	}
+	return env
+}
+
 func borderLines(shape tui.BorderShape) int {
 	switch shape {
 	case tui.BorderHorizontal, tui.BorderRounded, tui.BorderSharp, tui.BorderBold, tui.BorderDouble:
@@ -737,7 +754,7 @@ func (t *Terminal) ansiLabelPrinter(str string, color *tui.ColorPair, fill bool)
 
 	// Simpler printer for strings without ANSI colors or tab characters
 	if colors == nil && strings.IndexRune(str, '\t') < 0 {
-		length := runewidth.StringWidth(str)
+		length := util.StringWidth(str)
 		if length == 0 {
 			return nil, 0
 		}
@@ -871,10 +888,21 @@ func reverseStringArray(input []string) []string {
 	return reversed
 }
 
+func (t *Terminal) changeHeader(header string) bool {
+	lines := strings.Split(strings.TrimSuffix(header, "\n"), "\n")
+	switch t.layout {
+	case layoutDefault, layoutReverseList:
+		lines = reverseStringArray(lines)
+	}
+	needFullRedraw := len(t.header0) != len(lines)
+	t.header0 = lines
+	return needFullRedraw
+}
+
 // UpdateHeader updates the header
 func (t *Terminal) UpdateHeader(header []string) {
 	t.mutex.Lock()
-	t.header = append(append([]string{}, t.header0...), header...)
+	t.header = header
 	t.mutex.Unlock()
 	t.reqBox.Set(reqHeader, nil)
 }
@@ -895,16 +923,54 @@ func (t *Terminal) UpdateProgress(progress float32) {
 // UpdateList updates Merger to display the list
 func (t *Terminal) UpdateList(merger *Merger, reset bool) {
 	t.mutex.Lock()
+	var prevIndex int32 = -1
+	if !reset && t.track != trackDisabled {
+		if t.merger.Length() > 0 {
+			prevIndex = t.merger.Get(t.cy).item.Index()
+		} else if merger.Length() > 0 {
+			prevIndex = merger.First().item.Index()
+		}
+	}
 	t.progress = 100
 	t.merger = merger
 	if reset {
 		t.selected = make(map[int32]selectedItem)
 		t.version++
 	}
-	if t.hasLoadActions && t.triggerLoad {
+	if t.triggerLoad {
 		t.triggerLoad = false
 		t.eventChan <- tui.Load.AsEvent()
 	}
+	if prevIndex >= 0 {
+		pos := t.cy - t.offset
+		count := t.merger.Length()
+		i := t.merger.FindIndex(prevIndex)
+		if i >= 0 {
+			t.cy = i
+			t.offset = t.cy - pos
+		} else if t.track == trackCurrent {
+			t.track = trackDisabled
+			t.cy = pos
+			t.offset = 0
+		} else if t.cy > count {
+			// Try to keep the vertical position when the list shrinks
+			t.cy = count - util.Min(count, t.maxItems()) + pos
+		}
+	}
+	if !t.reading {
+		switch t.merger.Length() {
+		case 0:
+			zero := tui.Zero.AsEvent()
+			if _, prs := t.keymap[zero]; prs {
+				t.eventChan <- zero
+			}
+		case 1:
+			one := tui.One.AsEvent()
+			if _, prs := t.keymap[one]; prs {
+				t.eventChan <- one
+			}
+		}
+	}
 	t.mutex.Unlock()
 	t.reqBox.Set(reqInfo, nil)
 	t.reqBox.Set(reqList, nil)
@@ -1032,7 +1098,7 @@ func (t *Terminal) adjustMarginAndPadding() (int, int, [4]int, [4]int) {
 	if t.noInfoLine() {
 		minAreaHeight -= 1
 	}
-	if t.mayNeedPreviewWindow() {
+	if t.needPreviewWindow() {
 		minPreviewHeight := 1 + borderLines(t.previewOpts.border)
 		minPreviewWidth := 5
 		switch t.previewOpts.position {
@@ -1115,7 +1181,7 @@ func (t *Terminal) resizeWindows(forcePreview bool) {
 
 	// Set up preview window
 	noBorder := tui.MakeBorderStyle(tui.BorderNone, t.unicode)
-	if t.mayNeedPreviewWindow() {
+	if forcePreview || t.needPreviewWindow() {
 		var resizePreviewWindows func(previewOpts *previewOpts)
 		resizePreviewWindows = func(previewOpts *previewOpts) {
 			t.activePreviewOpts = previewOpts
@@ -1244,6 +1310,8 @@ func (t *Terminal) resizeWindows(forcePreview bool) {
 			}
 		}
 		resizePreviewWindows(&t.previewOpts)
+	} else {
+		t.activePreviewOpts = &t.previewOpts
 	}
 
 	// Without preview window
@@ -1305,7 +1373,7 @@ func (t *Terminal) move(y int, x int, clear bool) {
 	case layoutDefault:
 		y = h - y - 1
 	case layoutReverseList:
-		n := 2 + len(t.header)
+		n := 2 + len(t.header0) + len(t.header)
 		if t.noInfoLine() {
 			n--
 		}
@@ -1333,8 +1401,7 @@ func (t *Terminal) updatePromptOffset() ([]rune, []rune) {
 
 	_, overflow := t.trimLeft(t.input[:t.cx], maxWidth)
 	minOffset := int(overflow)
-	maxOffset := util.Min(util.Min(len(t.input), minOffset+maxWidth), t.cx)
+	maxOffset := minOffset + (maxWidth-util.Max(0, maxWidth-t.cx))/2
-
 	t.xoffset = util.Constrain(t.xoffset, minOffset, maxOffset)
 	before, _ := t.trimLeft(t.input[t.xoffset:t.cx], maxWidth)
 	beforeLen := t.displayWidth(before)
@@ -1399,7 +1466,7 @@ func (t *Terminal) printInfo() {
 		pos = t.promptLen + t.queryLen[0] + t.queryLen[1] + 1
 		str := t.infoSep
 		maxWidth := t.window.Width() - pos
-		width := runewidth.StringWidth(str)
+		width := util.StringWidth(str)
 		if width > maxWidth {
 			trimmed, _ := t.trimRight([]rune(str), maxWidth)
 			str = string(trimmed)
@@ -1426,6 +1493,9 @@ func (t *Terminal) printInfo() {
 			output += " -S"
 		}
 	}
+	if t.track != trackDisabled {
+		output += " +T"
+	}
 	if t.multi > 0 {
 		if t.multi == maxMulti {
 			output += fmt.Sprintf(" (%d)", len(t.selected))
@@ -1451,7 +1521,7 @@ func (t *Terminal) printInfo() {
 }
 
 func (t *Terminal) printHeader() {
-	if len(t.header) == 0 {
+	if len(t.header0)+len(t.header) == 0 {
 		return
 	}
 	max := t.window.Height()
@@ -1462,7 +1532,7 @@ func (t *Terminal) printHeader() {
 		}
 	}
 	var state *ansiState
-	for idx, lineStr := range t.header {
+	for idx, lineStr := range append(append([]string{}, t.header0...), t.header...) {
 		line := idx
 		if !t.headerFirst {
 			line++
@@ -1496,7 +1566,7 @@ func (t *Terminal) printList() {
 		if t.layout == layoutDefault {
 			i = maxy - 1 - j
 		}
-		line := i + 2 + len(t.header)
+		line := i + 2 + len(t.header0) + len(t.header)
 		if t.noInfoLine() {
 			line--
 		}
@@ -1802,7 +1872,7 @@ func (t *Terminal) renderPreviewText(height int, lines []string, lineNo int, unc
 		if ansi != nil {
 			ansi.lbg = -1
 		}
-		line = strings.TrimSuffix(line, "\n")
+		line = strings.TrimRight(line, "\r\n")
 		if lineNo >= height || t.pwindow.Y() == height-1 && t.pwindow.X() > 0 {
 			t.previewed.filled = true
 			t.previewer.scrollable = true
@@ -1824,12 +1894,14 @@ func (t *Terminal) renderPreviewText(height int, lines []string, lineNo int, unc
 					trimmed, isTrimmed = t.trimRight(trimmed, maxWidth-t.pwindow.X())
 				}
 				str, width := t.processTabs(trimmed, prefixWidth)
-				prefixWidth += width
+				if width > prefixWidth {
-				if t.theme.Colored && ansi != nil && ansi.colored() {
+					prefixWidth = width
-					lbg = ansi.lbg
+					if t.theme.Colored && ansi != nil && ansi.colored() {
-					fillRet = t.pwindow.CFill(ansi.fg, ansi.bg, ansi.attr, str)
+						lbg = ansi.lbg
-				} else {
+						fillRet = t.pwindow.CFill(ansi.fg, ansi.bg, ansi.attr, str)
-					fillRet = t.pwindow.CFill(tui.ColPreview.Fg(), tui.ColPreview.Bg(), tui.AttrRegular, str)
+					} else {
+						fillRet = t.pwindow.CFill(tui.ColPreview.Fg(), tui.ColPreview.Bg(), tui.AttrRegular, str)
+					}
 				}
 				return !isTrimmed &&
 					(fillRet == tui.FillContinue || t.previewOpts.wrap && fillRet == tui.FillNextLine)
@@ -1932,7 +2004,7 @@ func (t *Terminal) processTabs(runes []rune, prefixWidth int) (string, int) {
 			w = t.tabstop - l%t.tabstop
 			strbuf.WriteString(strings.Repeat(" ", w))
 		} else {
-			w = runewidth.StringWidth(str)
+			w = util.StringWidth(str)
 			strbuf.WriteString(str)
 		}
 		l += w
@@ -2232,16 +2304,17 @@ func (t *Terminal) redraw() {
 	t.printAll()
 }
 
-func (t *Terminal) executeCommand(template string, forcePlus bool, background bool, captureFirstLine bool) string {
+func (t *Terminal) executeCommand(template string, forcePlus bool, background bool, capture bool, firstLineOnly bool) string {
 	line := ""
-	valid, list := t.buildPlusList(template, forcePlus, false)
+	valid, list := t.buildPlusList(template, forcePlus)
-	// captureFirstLine is used for transform-{prompt,query} and we don't want to
+	// 'capture' is used for transform-* and we don't want to
 	// return an empty string in those cases
-	if !valid && !captureFirstLine {
+	if !valid && !capture {
 		return line
 	}
 	command := t.replacePlaceholder(template, forcePlus, string(t.input), list)
 	cmd := util.ExecCommand(command, false)
+	cmd.Env = t.environ()
 	t.executing.Set(true)
 	if !background {
 		cmd.Stdin = tui.TtyIn()
@@ -2253,12 +2326,17 @@ func (t *Terminal) executeCommand(template string, forcePlus bool, background bo
 		t.redraw()
 		t.refresh()
 	} else {
-		if captureFirstLine {
+		if capture {
 			out, _ := cmd.StdoutPipe()
 			reader := bufio.NewReader(out)
 			cmd.Start()
-			line, _ = reader.ReadString('\n')
+			if firstLineOnly {
-			line = strings.TrimRight(line, "\r\n")
+				line, _ = reader.ReadString('\n')
+				line = strings.TrimRight(line, "\r\n")
+			} else {
+				bytes, _ := io.ReadAll(reader)
+				line = string(bytes)
+			}
 			cmd.Wait()
 		} else {
 			cmd.Run()
@@ -2273,13 +2351,13 @@ func (t *Terminal) hasPreviewer() bool {
 	return t.previewBox != nil
 }
 
-func (t *Terminal) mayNeedPreviewWindow() bool {
+func (t *Terminal) needPreviewWindow() bool {
-	return t.hasPreviewer() && t.previewer.enabled && t.previewOpts.Visible()
+	return t.hasPreviewer() && len(t.previewOpts.command) > 0 && t.previewOpts.Visible()
 }
 
 // Check if previewer is currently in action (invisible previewer with size 0 or visible previewer)
-func (t *Terminal) isPreviewEnabled() bool {
+func (t *Terminal) canPreview() bool {
-	return t.hasPreviewer() && t.previewer.enabled && (!t.previewOpts.Visible() || t.pwindow != nil)
+	return t.hasPreviewer() && (!t.previewOpts.Visible() && !t.previewOpts.hidden || t.hasPreviewWindow())
 }
 
 func (t *Terminal) hasPreviewWindow() bool {
@@ -2294,10 +2372,10 @@ func (t *Terminal) currentItem() *Item {
 	return nil
 }
 
-func (t *Terminal) buildPlusList(template string, forcePlus bool, forceEvaluation bool) (bool, []*Item) {
+func (t *Terminal) buildPlusList(template string, forcePlus bool) (bool, []*Item) {
 	current := t.currentItem()
 	slot, plus, query := hasPreviewFlags(template)
-	if !forceEvaluation && !(!slot || query || (forcePlus || plus) && len(t.selected) > 0) {
+	if !(!slot || query || (forcePlus || plus) && len(t.selected) > 0) {
 		return current != nil, []*Item{current, current}
 	}
 
@@ -2387,7 +2465,7 @@ func (t *Terminal) Loop() {
 		pad := fitpad.pad
 		t.tui.Resize(func(termHeight int) int {
 			contentHeight := fit + t.extraLines()
-			if t.mayNeedPreviewWindow() {
+			if t.needPreviewWindow() {
 				if t.previewOpts.aboveOrBelow() {
 					if t.previewOpts.size.percent {
 						newContentHeight := int(float64(contentHeight) * 100. / (100. - t.previewOpts.size.size))
@@ -2488,17 +2566,17 @@ func (t *Terminal) Loop() {
 					_, query := t.Input()
 					command := t.replacePlaceholder(commandTemplate, false, string(query), items)
 					cmd := util.ExecCommand(command, true)
+					env := t.environ()
 					if pwindow != nil {
 						height := pwindow.Height()
-						env := os.Environ()
 						lines := fmt.Sprintf("LINES=%d", height)
 						columns := fmt.Sprintf("COLUMNS=%d", pwindow.Width())
 						env = append(env, lines)
 						env = append(env, "FZF_PREVIEW_"+lines)
 						env = append(env, columns)
 						env = append(env, "FZF_PREVIEW_"+columns)
-						cmd.Env = env
 					}
+					cmd.Env = env
 
 					out, _ := cmd.StdoutPipe()
 					cmd.Stderr = cmd.Stdout
@@ -2621,8 +2699,8 @@ func (t *Terminal) Loop() {
 	}
 
 	refreshPreview := func(command string) {
-		if len(command) > 0 && t.isPreviewEnabled() {
+		if len(command) > 0 && t.canPreview() {
-			_, list := t.buildPlusList(command, false, false)
+			_, list := t.buildPlusList(command, false)
 			t.cancelPreview()
 			t.previewBox.Set(reqPreviewEnqueue, previewRequest{command, t.pwindow, t.evaluateScrollOffset(), list})
 		}
@@ -2669,6 +2747,10 @@ func (t *Terminal) Loop() {
 							currentIndex = currentItem.Index()
 						}
 						focusChanged := focusedIndex != currentIndex
+						if focusChanged && t.track == trackCurrent {
+							t.track = trackDisabled
+							t.printInfo()
+						}
 						if onFocus != nil && focusChanged {
 							t.serverChan <- onFocus
 						}
@@ -2696,7 +2778,7 @@ func (t *Terminal) Loop() {
 					case reqFullRedraw:
 						wasHidden := t.pwindow == nil
 						t.redraw()
-						if wasHidden && t.pwindow != nil {
+						if wasHidden && t.hasPreviewWindow() {
 							refreshPreview(t.previewOpts.command)
 						}
 					case reqClose:
@@ -2781,7 +2863,7 @@ func (t *Terminal) Loop() {
 			}
 			select {
 			case event = <-t.eventChan:
-				needBarrier = event != tui.Load.AsEvent()
+				needBarrier = !event.Is(tui.Load, tui.One, tui.Zero)
 			case actions = <-t.serverChan:
 				event = tui.Invalid.AsEvent()
 				needBarrier = false
@@ -2857,23 +2939,46 @@ func (t *Terminal) Loop() {
 		doAction = func(a *action) bool {
 			switch a.t {
 			case actIgnore:
+			case actBecome:
+				valid, list := t.buildPlusList(a.a, false)
+				if valid {
+					command := t.replacePlaceholder(a.a, false, string(t.input), list)
+					shell := os.Getenv("SHELL")
+					if len(shell) == 0 {
+						shell = "sh"
+					}
+					shellPath, err := exec.LookPath(shell)
+					if err == nil {
+						t.tui.Close()
+						if t.history != nil {
+							t.history.append(string(t.input))
+						}
+						util.SetStdin(tui.TtyIn())
+						syscall.Exec(shellPath, []string{shell, "-c", command}, os.Environ())
+					}
+				}
 			case actExecute, actExecuteSilent:
-				t.executeCommand(a.a, false, a.t == actExecuteSilent, false)
+				t.executeCommand(a.a, false, a.t == actExecuteSilent, false, false)
 			case actExecuteMulti:
-				t.executeCommand(a.a, true, false, false)
+				t.executeCommand(a.a, true, false, false, false)
 			case actInvalid:
 				t.mutex.Unlock()
 				return false
-			case actTogglePreview:
+			case actTogglePreview, actShowPreview, actHidePreview:
-				if t.hasPreviewer() {
+				var act bool
-					if t.activePreviewOpts != nil {
+				switch a.t {
-						t.activePreviewOpts.Toggle()
+				case actShowPreview:
-					} else if !t.previewOpts.Visible() {
+					act = !t.hasPreviewWindow() && len(t.previewOpts.command) > 0
-						t.previewer.enabled = !t.previewer.enabled
+				case actHidePreview:
-					}
+					act = t.hasPreviewWindow()
+				case actTogglePreview:
+					act = t.hasPreviewWindow() || len(t.previewOpts.command) > 0
+				}
+				if act {
+					t.activePreviewOpts.Toggle()
 					updatePreviewWindow(false)
-					if t.isPreviewEnabled() {
+					if t.canPreview() {
-						valid, list := t.buildPlusList(t.previewOpts.command, false, false)
+						valid, list := t.buildPlusList(t.previewOpts.command, false)
 						if valid {
 							t.cancelPreview()
 							t.previewBox.Set(reqPreviewEnqueue,
@@ -2889,11 +2994,11 @@ func (t *Terminal) Loop() {
 					req(reqPreviewRefresh)
 				}
 			case actTransformPrompt:
-				prompt := t.executeCommand(a.a, false, true, true)
+				prompt := t.executeCommand(a.a, false, true, true, true)
 				t.prompt, t.promptLen = t.parsePrompt(prompt)
 				req(reqPrompt)
 			case actTransformQuery:
-				query := t.executeCommand(a.a, false, true, true)
+				query := t.executeCommand(a.a, false, true, true, true)
 				t.input = []rune(query)
 				t.cx = len(t.input)
 			case actToggleSort:
@@ -2942,6 +3047,19 @@ func (t *Terminal) Loop() {
 			case actChangeQuery:
 				t.input = []rune(a.a)
 				t.cx = len(t.input)
+			case actTransformHeader:
+				header := t.executeCommand(a.a, false, true, true, false)
+				if t.changeHeader(header) {
+					req(reqFullRedraw)
+				} else {
+					req(reqHeader)
+				}
+			case actChangeHeader:
+				if t.changeHeader(a.a) {
+					req(reqFullRedraw)
+				} else {
+					req(reqHeader)
+				}
 			case actChangeBorderLabel:
 				if t.border != nil {
 					t.borderLabel, t.borderLabelLen = t.ansiLabelPrinter(a.a, &tui.ColBorderLabel, false)
@@ -2954,13 +3072,13 @@ func (t *Terminal) Loop() {
 				}
 			case actTransformBorderLabel:
 				if t.border != nil {
-					label := t.executeCommand(a.a, false, true, true)
+					label := t.executeCommand(a.a, false, true, true, true)
 					t.borderLabel, t.borderLabelLen = t.ansiLabelPrinter(label, &tui.ColBorderLabel, false)
 					req(reqRedrawBorderLabel)
 				}
 			case actTransformPreviewLabel:
 				if t.pborder != nil {
-					label := t.executeCommand(a.a, false, true, true)
+					label := t.executeCommand(a.a, false, true, true, true)
 					t.previewLabel, t.previewLabelLen = t.ansiLabelPrinter(label, &tui.ColPreviewLabel, false)
 					req(reqRedrawPreviewLabel)
 				}
@@ -2968,7 +3086,6 @@ func (t *Terminal) Loop() {
 				t.prompt, t.promptLen = t.parsePrompt(a.a)
 				req(reqPrompt)
 			case actPreview:
-				t.previewer.enabled = true
 				updatePreviewWindow(true)
 				refreshPreview(a.a)
 			case actRefreshPreview:
@@ -3211,6 +3328,19 @@ func (t *Terminal) Loop() {
 				t.paused = !t.paused
 				changed = !t.paused
 				req(reqPrompt)
+			case actToggleTrack:
+				switch t.track {
+				case trackEnabled:
+					t.track = trackDisabled
+				case trackDisabled:
+					t.track = trackEnabled
+				}
+				req(reqInfo)
+			case actTrack:
+				if t.track == trackDisabled {
+					t.track = trackCurrent
+				}
+				req(reqInfo)
 			case actEnableSearch:
 				t.paused = false
 				changed = true
@@ -3262,7 +3392,7 @@ func (t *Terminal) Loop() {
 					break
 				}
 
-				// Prevew scrollbar dragging
+				// Preview scrollbar dragging
 				headerLines := t.previewOpts.headerLines
 				pbarDragging = me.Down && (pbarDragging || clicked && t.hasPreviewWindow() && my >= t.pwindow.Top()+headerLines && my < t.pwindow.Top()+t.pwindow.Height() && mx == t.pwindow.Left()+t.pwindow.Width())
 				if pbarDragging {
@@ -3288,7 +3418,7 @@ func (t *Terminal) Loop() {
 				// Translate coordinates
 				mx -= t.window.Left()
 				my -= t.window.Top()
-				min := 2 + len(t.header)
+				min := 2 + len(t.header0) + len(t.header)
 				if t.noInfoLine() {
 					min--
 				}
@@ -3353,7 +3483,7 @@ func (t *Terminal) Loop() {
 			case actReload, actReloadSync:
 				t.failed = nil
 
-				valid, list := t.buildPlusList(a.a, false, false)
+				valid, list := t.buildPlusList(a.a, false)
 				if !valid {
 					// We run the command even when there's no match
 					// 1. If the template doesn't have any slots
@@ -3381,9 +3511,8 @@ func (t *Terminal) Loop() {
 				}
 			case actChangePreview:
 				if t.previewOpts.command != a.a {
-					t.previewer.enabled = len(a.a) > 0
-					updatePreviewWindow(false)
 					t.previewOpts.command = a.a
+					updatePreviewWindow(false)
 					refreshPreview(t.previewOpts.command)
 				}
 			case actChangePreviewWindow:
@@ -3403,7 +3532,7 @@ func (t *Terminal) Loop() {
 				if !currentPreviewOpts.sameLayout(t.previewOpts) {
 					wasHidden := t.pwindow == nil
 					updatePreviewWindow(false)
-					if wasHidden && t.pwindow != nil {
+					if wasHidden && t.hasPreviewWindow() {
 						refreshPreview(t.previewOpts.command)
 					} else {
 						req(reqPreviewRefresh)
@@ -3480,12 +3609,10 @@ func (t *Terminal) Loop() {
 			req(reqList)
 		}
 
-		if queryChanged {
+		if queryChanged && t.canPreview() && len(t.previewOpts.command) > 0 {
-			if t.isPreviewEnabled() {
+			_, _, q := hasPreviewFlags(t.previewOpts.command)
-				_, _, q := hasPreviewFlags(t.previewOpts.command)
+			if q {
-				if q {
+				t.version++
-					t.version++
-				}
 			}
 		}
 
@@ -3496,7 +3623,7 @@ func (t *Terminal) Loop() {
 		t.mutex.Unlock() // Must be unlocked before touching reqBox
 
 		if changed || newCommand != nil {
-			t.eventBox.Set(EvtSearchNew, searchRequest{sort: t.sort, sync: reloadSync, command: newCommand})
+			t.eventBox.Set(EvtSearchNew, searchRequest{sort: t.sort, sync: reloadSync, command: newCommand, changed: changed})
 		}
 		for _, event := range events {
 			t.reqBox.Set(event, nil)
@@ -3560,7 +3687,7 @@ func (t *Terminal) vset(o int) bool {
 }
 
 func (t *Terminal) maxItems() int {
-	max := t.window.Height() - 2 - len(t.header)
+	max := t.window.Height() - 2 - len(t.header0) - len(t.header)
 	if t.noInfoLine() {
 		max++
 	}

src/tui/light.go

@@ -32,20 +32,26 @@ var offsetRegexp *regexp.Regexp = regexp.MustCompile("(.*)\x1b\\[([0-9]+);([0-9]
 var offsetRegexpBegin *regexp.Regexp = regexp.MustCompile("^\x1b\\[[0-9]+;[0-9]+R")
 
 func (r *LightRenderer) stderr(str string) {
-	r.stderrInternal(str, true)
+	r.stderrInternal(str, true, "")
 }
 
-// FIXME: Need better handling of non-displayable characters
+const CR string = "\x1b[2m␍"
-func (r *LightRenderer) stderrInternal(str string, allowNLCR bool) {
+const LF string = "\x1b[2m␊"
+
+func (r *LightRenderer) stderrInternal(str string, allowNLCR bool, resetCode string) {
 	bytes := []byte(str)
 	runes := []rune{}
 	for len(bytes) > 0 {
 		r, sz := utf8.DecodeRune(bytes)
 		nlcr := r == '\n' || r == '\r'
 		if r >= 32 || r == '\x1b' || nlcr {
-			if r == utf8.RuneError || nlcr && !allowNLCR {
+			if nlcr && !allowNLCR {
-				runes = append(runes, ' ')
+				if r == '\r' {
-			} else {
+					runes = append(runes, []rune(CR+resetCode)...)
+				} else {
+					runes = append(runes, []rune(LF+resetCode)...)
+				}
+			} else if r != utf8.RuneError {
 				runes = append(runes, r)
 			}
 		}
@@ -54,8 +60,10 @@ func (r *LightRenderer) stderrInternal(str string, allowNLCR bool) {
 	r.queued.WriteString(string(runes))
 }
 
-func (r *LightRenderer) csi(code string) {
+func (r *LightRenderer) csi(code string) string {
-	r.stderr("\x1b[" + code)
+	fullcode := "\x1b[" + code
+	r.stderr(fullcode)
+	return fullcode
 }
 
 func (r *LightRenderer) flush() {
@@ -825,12 +833,12 @@ func (w *LightWindow) drawBorderAround(onlyHorizontal bool) {
 	w.CPrint(color, string(w.border.bottomLeft)+repeat(w.border.horizontal, (w.width-bcw)/hw)+repeat(' ', rem)+string(w.border.bottomRight))
 }
 
-func (w *LightWindow) csi(code string) {
+func (w *LightWindow) csi(code string) string {
-	w.renderer.csi(code)
+	return w.renderer.csi(code)
 }
 
-func (w *LightWindow) stderrInternal(str string, allowNLCR bool) {
+func (w *LightWindow) stderrInternal(str string, allowNLCR bool, resetCode string) {
-	w.renderer.stderrInternal(str, allowNLCR)
+	w.renderer.stderrInternal(str, allowNLCR, resetCode)
 }
 
 func (w *LightWindow) Top() int {
@@ -936,10 +944,10 @@ func colorCodes(fg Color, bg Color) []string {
 	return codes
 }
 
-func (w *LightWindow) csiColor(fg Color, bg Color, attr Attr) bool {
+func (w *LightWindow) csiColor(fg Color, bg Color, attr Attr) (bool, string) {
 	codes := append(attrCodes(attr), colorCodes(fg, bg)...)
-	w.csi(";" + strings.Join(codes, ";") + "m")
+	code := w.csi(";" + strings.Join(codes, ";") + "m")
-	return len(codes) > 0
+	return len(codes) > 0, code
 }
 
 func (w *LightWindow) Print(text string) {
@@ -951,16 +959,17 @@ func cleanse(str string) string {
 }
 
 func (w *LightWindow) CPrint(pair ColorPair, text string) {
-	w.csiColor(pair.Fg(), pair.Bg(), pair.Attr())
+	_, code := w.csiColor(pair.Fg(), pair.Bg(), pair.Attr())
-	w.stderrInternal(cleanse(text), false)
+	w.stderrInternal(cleanse(text), false, code)
 	w.csi("m")
 }
 
 func (w *LightWindow) cprint2(fg Color, bg Color, attr Attr, text string) {
-	if w.csiColor(fg, bg, attr) {
+	hasColors, code := w.csiColor(fg, bg, attr)
+	if hasColors {
 		defer w.csi("m")
 	}
-	w.stderrInternal(cleanse(text), false)
+	w.stderrInternal(cleanse(text), false, code)
 }
 
 type wrappedLine struct {
@@ -980,6 +989,8 @@ func wrapLine(input string, prefixLength int, max int, tabstop int) []wrappedLin
 		if len(rs) == 1 && rs[0] == '\t' {
 			w = tabstop - (prefixLength+width)%tabstop
 			str = repeat(' ', w)
+		} else if rs[0] == '\r' {
+			w++
 		} else {
 			w = runewidth.StringWidth(str)
 		}
@@ -998,12 +1009,12 @@ func wrapLine(input string, prefixLength int, max int, tabstop int) []wrappedLin
 	return lines
 }
 
-func (w *LightWindow) fill(str string, onMove func()) FillReturn {
+func (w *LightWindow) fill(str string, resetCode string) FillReturn {
 	allLines := strings.Split(str, "\n")
 	for i, line := range allLines {
 		lines := wrapLine(line, w.posx, w.width, w.tabstop)
 		for j, wl := range lines {
-			w.stderrInternal(wl.text, false)
+			w.stderrInternal(wl.text, false, resetCode)
 			w.posx += wl.displayWidth
 
 			// Wrap line
@@ -1013,7 +1024,7 @@ func (w *LightWindow) fill(str string, onMove func()) FillReturn {
 				}
 				w.MoveAndClear(w.posy, w.posx)
 				w.Move(w.posy+1, 0)
-				onMove()
+				w.renderer.stderr(resetCode)
 			}
 		}
 	}
@@ -1022,22 +1033,26 @@ func (w *LightWindow) fill(str string, onMove func()) FillReturn {
 			return FillSuspend
 		}
 		w.Move(w.posy+1, 0)
-		onMove()
+		w.renderer.stderr(resetCode)
 		return FillNextLine
 	}
 	return FillContinue
 }
 
-func (w *LightWindow) setBg() {
+func (w *LightWindow) setBg() string {
 	if w.bg != colDefault {
-		w.csiColor(colDefault, w.bg, AttrRegular)
+		_, code := w.csiColor(colDefault, w.bg, AttrRegular)
+		return code
 	}
+	// Should clear dim attribute after ␍ in the preview window
+	// e.g. printf "foo\rbar" | fzf --ansi --preview 'printf "foo\rbar"'
+	return "\x1b[m"
 }
 
 func (w *LightWindow) Fill(text string) FillReturn {
 	w.Move(w.posy, w.posx)
-	w.setBg()
+	code := w.setBg()
-	return w.fill(text, w.setBg)
+	return w.fill(text, code)
 }
 
 func (w *LightWindow) CFill(fg Color, bg Color, attr Attr, text string) FillReturn {
@@ -1048,11 +1063,11 @@ func (w *LightWindow) CFill(fg Color, bg Color, attr Attr, text string) FillRetu
 	if bg == colDefault {
 		bg = w.bg
 	}
-	if w.csiColor(fg, bg, attr) {
+	if hasColors, resetCode := w.csiColor(fg, bg, attr); hasColors {
 		defer w.csi("m")
-		return w.fill(text, func() { w.csiColor(fg, bg, attr) })
+		return w.fill(text, resetCode)
 	}
-	return w.fill(text, w.setBg)
+	return w.fill(text, w.setBg())
 }
 
 func (w *LightWindow) FinishFill() {

src/tui/tcell.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/gdamore/tcell/v2"
 	"github.com/gdamore/tcell/v2/encoding"
+	"github.com/junegunn/fzf/src/util"
 
 	"github.com/mattn/go-runewidth"
 	"github.com/rivo/uniseg"
@@ -572,26 +573,27 @@ func (w *TcellWindow) printString(text string, pair ColorPair) {
 
 	gr := uniseg.NewGraphemes(text)
 	for gr.Next() {
+		st := style
 		rs := gr.Runes()
 
 		if len(rs) == 1 {
 			r := rs[0]
-			if r < rune(' ') { // ignore control characters
+			if r == '\r' {
-				continue
+				st = style.Dim(true)
+				rs[0] = '␍'
 			} else if r == '\n' {
-				w.lastY++
+				st = style.Dim(true)
-				lx = 0
+				rs[0] = '␊'
-				continue
+			} else if r < rune(' ') { // ignore control characters
-			} else if r == '\u000D' { // skip carriage return
 				continue
 			}
 		}
 		var xPos = w.left + w.lastX + lx
 		var yPos = w.top + w.lastY
 		if xPos < (w.left+w.width) && yPos < (w.top+w.height) {
-			_screen.SetContent(xPos, yPos, rs[0], rs[1:], style)
+			_screen.SetContent(xPos, yPos, rs[0], rs[1:], st)
 		}
-		lx += runewidth.StringWidth(string(rs))
+		lx += util.StringWidth(string(rs))
 	}
 	w.lastX += lx
 }
@@ -620,13 +622,22 @@ func (w *TcellWindow) fillString(text string, pair ColorPair) FillReturn {
 		Italic(a&Attr(tcell.AttrItalic) != 0)
 
 	gr := uniseg.NewGraphemes(text)
+Loop:
 	for gr.Next() {
+		st := style
 		rs := gr.Runes()
-		if len(rs) == 1 && rs[0] == '\n' {
+		if len(rs) == 1 {
-			w.lastY++
+			r := rs[0]
-			w.lastX = 0
+			switch r {
-			lx = 0
+			case '\r':
-			continue
+				st = style.Dim(true)
+				rs[0] = '␍'
+			case '\n':
+				w.lastY++
+				w.lastX = 0
+				lx = 0
+				continue Loop
+			}
 		}
 
 		// word wrap:
@@ -643,8 +654,8 @@ func (w *TcellWindow) fillString(text string, pair ColorPair) FillReturn {
 			return FillSuspend
 		}
 
-		_screen.SetContent(xPos, yPos, rs[0], rs[1:], style)
+		_screen.SetContent(xPos, yPos, rs[0], rs[1:], st)
-		lx += runewidth.StringWidth(string(rs))
+		lx += util.StringWidth(string(rs))
 	}
 	w.lastX += lx
 	if w.lastX == w.width {

src/tui/tui.go

@@ -93,6 +93,8 @@ const (
 	Start
 	Load
 	Focus
+	One
+	Zero
 
 	AltBS
 
@@ -282,6 +284,15 @@ type Event struct {
 	MouseEvent *MouseEvent
 }
 
+func (e Event) Is(types ...EventType) bool {
+	for _, t := range types {
+		if e.Type == t {
+			return true
+		}
+	}
+	return false
+}
+
 type MouseEvent struct {
 	Y      int
 	X      int
@@ -525,28 +536,28 @@ func EmptyTheme() *ColorTheme {
 func NoColorTheme() *ColorTheme {
 	return &ColorTheme{
 		Colored:      false,
-		Input:        ColorAttr{colDefault, AttrRegular},
+		Input:        ColorAttr{colDefault, AttrUndefined},
-		Fg:           ColorAttr{colDefault, AttrRegular},
+		Fg:           ColorAttr{colDefault, AttrUndefined},
-		Bg:           ColorAttr{colDefault, AttrRegular},
+		Bg:           ColorAttr{colDefault, AttrUndefined},
-		DarkBg:       ColorAttr{colDefault, AttrRegular},
+		DarkBg:       ColorAttr{colDefault, AttrUndefined},
-		Prompt:       ColorAttr{colDefault, AttrRegular},
+		Prompt:       ColorAttr{colDefault, AttrUndefined},
 		Match:        ColorAttr{colDefault, Underline},
 		Current:      ColorAttr{colDefault, Reverse},
 		CurrentMatch: ColorAttr{colDefault, Reverse | Underline},
-		Spinner:      ColorAttr{colDefault, AttrRegular},
+		Spinner:      ColorAttr{colDefault, AttrUndefined},
-		Info:         ColorAttr{colDefault, AttrRegular},
+		Info:         ColorAttr{colDefault, AttrUndefined},
-		Cursor:       ColorAttr{colDefault, AttrRegular},
+		Cursor:       ColorAttr{colDefault, AttrUndefined},
-		Selected:     ColorAttr{colDefault, AttrRegular},
+		Selected:     ColorAttr{colDefault, AttrUndefined},
-		Header:       ColorAttr{colDefault, AttrRegular},
+		Header:       ColorAttr{colDefault, AttrUndefined},
-		Border:       ColorAttr{colDefault, AttrRegular},
+		Border:       ColorAttr{colDefault, AttrUndefined},
-		BorderLabel:  ColorAttr{colDefault, AttrRegular},
+		BorderLabel:  ColorAttr{colDefault, AttrUndefined},
-		Disabled:     ColorAttr{colDefault, AttrRegular},
+		Disabled:     ColorAttr{colDefault, AttrUndefined},
-		PreviewFg:    ColorAttr{colDefault, AttrRegular},
+		PreviewFg:    ColorAttr{colDefault, AttrUndefined},
-		PreviewBg:    ColorAttr{colDefault, AttrRegular},
+		PreviewBg:    ColorAttr{colDefault, AttrUndefined},
-		Gutter:       ColorAttr{colDefault, AttrRegular},
+		Gutter:       ColorAttr{colDefault, AttrUndefined},
-		PreviewLabel: ColorAttr{colDefault, AttrRegular},
+		PreviewLabel: ColorAttr{colDefault, AttrUndefined},
-		Separator:    ColorAttr{colDefault, AttrRegular},
+		Separator:    ColorAttr{colDefault, AttrUndefined},
-		Scrollbar:    ColorAttr{colDefault, AttrRegular},
+		Scrollbar:    ColorAttr{colDefault, AttrUndefined},
 	}
 }
 

src/util/util.go

@@ -11,6 +11,11 @@ import (
 	"github.com/rivo/uniseg"
 )
 
+// StringWidth returns string width where each CR/LF character takes 1 column
+func StringWidth(s string) int {
+	return runewidth.StringWidth(s) + strings.Count(s, "\n") + strings.Count(s, "\r")
+}
+
 // RunesWidth returns runes width
 func RunesWidth(runes []rune, prefixWidth int, tabstop int, limit int) (int, int) {
 	width := 0
@@ -22,8 +27,7 @@ func RunesWidth(runes []rune, prefixWidth int, tabstop int, limit int) (int, int
 		if len(rs) == 1 && rs[0] == '\t' {
 			w = tabstop - (prefixWidth+width)%tabstop
 		} else {
-			s := string(rs)
+			w = StringWidth(string(rs))
-			w = runewidth.StringWidth(s) + strings.Count(s, "\n")
 		}
 		width += w
 		if width > limit {
@@ -41,7 +45,7 @@ func Truncate(input string, limit int) ([]rune, int) {
 	gr := uniseg.NewGraphemes(input)
 	for gr.Next() {
 		rs := gr.Runes()
-		w := runewidth.StringWidth(string(rs))
+		w := StringWidth(string(rs))
 		if width+w > limit {
 			return runes, width
 		}

src/util/util_test.go

@@ -70,7 +70,7 @@ func TestMin32(t *testing.T) {
 	}
 }
 
-func TestContrain(t *testing.T) {
+func TestConstrain(t *testing.T) {
 	if Constrain(-3, -1, 3) != -1 {
 		t.Error("Expected", -1)
 	}
@@ -83,7 +83,7 @@ func TestContrain(t *testing.T) {
 	}
 }
 
-func TestContrain32(t *testing.T) {
+func TestConstrain32(t *testing.T) {
 	if Constrain32(-3, -1, 3) != -1 {
 		t.Error("Expected", -1)
 	}

src/util/util_unix.go

@@ -6,6 +6,8 @@ import (
 	"os"
 	"os/exec"
 	"syscall"
+
+	"golang.org/x/sys/unix"
 )
 
 // ExecCommand executes the given command with $SHELL
@@ -45,3 +47,7 @@ func SetNonblock(file *os.File, nonblock bool) {
 func Read(fd int, b []byte) (int, error) {
 	return syscall.Read(int(fd), b)
 }
+
+func SetStdin(file *os.File) {
+	unix.Dup2(int(file.Fd()), 0)
+}

src/util/util_windows.go

@@ -81,3 +81,7 @@ func SetNonblock(file *os.File, nonblock bool) {
 func Read(fd int, b []byte) (int, error) {
 	return syscall.Read(syscall.Handle(fd), b)
 }
+
+func SetStdin(file *os.File) {
+	// No-op
+}

test/test_go.rb

@@ -180,7 +180,7 @@ class TestBase < Minitest::Test
   end
 
   def writelines(path, lines)
-    File.unlink(path) while File.exist?(path)
+    FileUtils.rm_f(path) while File.exist?(path)
     File.open(path, 'w') { |f| f.puts lines }
   end
 
@@ -188,7 +188,7 @@ class TestBase < Minitest::Test
     wait { assert_path_exists tempname }
     File.read(tempname)
   ensure
-    File.unlink(tempname) while File.exist?(tempname)
+    FileUtils.rm_f(tempname) while File.exist?(tempname)
     @temp_suffix += 1
     tmux.prepare
   end
@@ -905,11 +905,7 @@ class TestGoFZF < TestBase
     history_file = '/tmp/fzf-test-history'
 
     # History with limited number of entries
-    begin
+    FileUtils.rm_f(history_file)
-      File.unlink(history_file)
-    rescue StandardError
-      nil
-    end
     opts = "--history=#{history_file} --history-size=4"
     input = %w[00 11 22 33 44]
     input.each do |keys|
@@ -955,7 +951,7 @@ class TestGoFZF < TestBase
     tmux.until { |lines| assert_equal '> 33', lines[-1] }
     tmux.send_keys :Enter
   ensure
-    File.unlink(history_file)
+    FileUtils.rm_f(history_file)
   end
 
   def test_execute
@@ -984,11 +980,7 @@ class TestGoFZF < TestBase
       ], File.readlines(output, chomp: true)
     end
   ensure
-    begin
+    FileUtils.rm_f(output)
-      File.unlink(output)
-    rescue StandardError
-      nil
-    end
   end
 
   def test_execute_multi
@@ -1013,20 +1005,12 @@ class TestGoFZF < TestBase
       ], File.readlines(output, chomp: true)
     end
   ensure
-    begin
+    FileUtils.rm_f(output)
-      File.unlink(output)
-    rescue StandardError
-      nil
-    end
   end
 
   def test_execute_plus_flag
     output = tempname + '.tmp'
-    begin
+    FileUtils.rm_f(output)
-      File.unlink(output)
-    rescue StandardError
-      nil
-    end
     writelines(tempname, ['foo bar', '123 456'])
 
     tmux.send_keys "cat #{tempname} | #{FZF} --multi --bind 'x:execute-silent(echo {+}/{}/{+2}/{2} >> #{output})'", :Enter
@@ -1059,21 +1043,13 @@ class TestGoFZF < TestBase
       ], File.readlines(output, chomp: true)
     end
   rescue StandardError
-    begin
+    FileUtils.rm_f(output)
-      File.unlink(output)
-    rescue StandardError
-      nil
-    end
   end
 
   def test_execute_shell
     # Custom script to use as $SHELL
     output = tempname + '.out'
-    begin
+    FileUtils.rm_f(output)
-      File.unlink(output)
-    rescue StandardError
-      nil
-    end
     writelines(tempname,
                ['#!/usr/bin/env bash', "echo $1 / $2 > #{output}"])
     system("chmod +x #{tempname}")
@@ -1087,11 +1063,7 @@ class TestGoFZF < TestBase
       assert_equal ["-c / 'foo'bar"], File.readlines(output, chomp: true)
     end
   ensure
-    begin
+    FileUtils.rm_f(output)
-      File.unlink(output)
-    rescue StandardError
-      nil
-    end
   end
 
   def test_cycle
@@ -1485,6 +1457,83 @@ class TestGoFZF < TestBase
     tmux.until { |lines| assert_includes lines[1], ' {5-1  3 4} ' }
   end
 
+  def test_toggle_preview_without_default_preview_command
+    tmux.send_keys %(seq 100 | #{FZF} --bind 'space:preview(echo [{}]),enter:toggle-preview' --preview-window up,border-double), :Enter
+    tmux.until do |lines|
+      assert_equal 100, lines.match_count
+      refute_includes lines[1], '║ [1]'
+    end
+
+    # toggle-preview should do nothing
+    tmux.send_keys :Enter
+    tmux.until { |lines| refute_includes lines[1], '║ [1]' }
+    tmux.send_keys :Up
+    tmux.until do |lines|
+      refute_includes lines[1], '║ [1]'
+      refute_includes lines[1], '║ [2]'
+    end
+
+    tmux.send_keys :Up
+    tmux.until do |lines|
+      assert_includes lines, '> 3'
+      refute_includes lines[1], '║ [3]'
+    end
+
+    # One-off preview action
+    tmux.send_keys :Space
+    tmux.until { |lines| assert_includes lines[1], '║ [3]' }
+
+    # toggle-preview to hide it
+    tmux.send_keys :Enter
+    tmux.until { |lines| refute_includes lines[1], '║ [3]' }
+
+    # toggle-preview again does nothing
+    tmux.send_keys :Enter, :Up
+    tmux.until do |lines|
+      assert_includes lines, '> 4'
+      refute_includes lines[1], '║ [4]'
+    end
+  end
+
+  def test_show_and_hide_preview
+    tmux.send_keys %(seq 100 | #{FZF} --preview-window hidden,border-bold --preview 'echo [{}]' --bind 'a:show-preview,b:hide-preview'), :Enter
+
+    # Hidden by default
+    tmux.until do |lines|
+      assert_equal 100, lines.match_count
+      refute_includes lines[1], '┃ [1]'
+    end
+
+    # Show
+    tmux.send_keys :a
+    tmux.until { |lines| assert_includes lines[1], '┃ [1]' }
+
+    # Already shown
+    tmux.send_keys :a
+    tmux.send_keys :Up
+    tmux.until { |lines| assert_includes lines[1], '┃ [2]' }
+
+    # Hide
+    tmux.send_keys :b
+    tmux.send_keys :Up
+    tmux.until do |lines|
+      assert_includes lines, '> 3'
+      refute_includes lines[1], '┃ [3]'
+    end
+
+    # Already hidden
+    tmux.send_keys :b
+    tmux.send_keys :Up
+    tmux.until do |lines|
+      assert_includes lines, '> 4'
+      refute_includes lines[1], '┃ [4]'
+    end
+
+    # Show it again
+    tmux.send_keys :a
+    tmux.until { |lines| assert_includes lines[1], '┃ [4]' }
+  end
+
   def test_preview_hidden
     tmux.send_keys %(seq 1000 | #{FZF} --preview 'echo {{}-{}-$FZF_PREVIEW_LINES-$FZF_PREVIEW_COLUMNS}' --preview-window down:1:hidden --bind ?:toggle-preview), :Enter
     tmux.until { |lines| assert_equal '>', lines[-1] }
@@ -1497,11 +1546,7 @@ class TestGoFZF < TestBase
   end
 
   def test_preview_size_0
-    begin
+    FileUtils.rm_f(tempname)
-      File.unlink(tempname)
-    rescue StandardError
-      nil
-    end
     tmux.send_keys %(seq 100 | #{FZF} --reverse --preview 'echo {} >> #{tempname}; echo ' --preview-window 0 --bind space:toggle-preview), :Enter
     tmux.until do |lines|
       assert_equal 100, lines.item_count
@@ -1526,6 +1571,32 @@ class TestGoFZF < TestBase
     end
   end
 
+  def test_preview_size_0_hidden
+    FileUtils.rm_f(tempname)
+    tmux.send_keys %(seq 100 | #{FZF} --reverse --preview 'echo {} >> #{tempname}; echo ' --preview-window 0,hidden --bind space:toggle-preview), :Enter
+    tmux.until { |lines| assert_equal 100, lines.item_count }
+    tmux.send_keys :Down, :Down
+    tmux.until { |lines| assert_includes lines, '> 3' }
+    wait { refute_path_exists tempname }
+    tmux.send_keys :Space
+    wait do
+      assert_path_exists tempname
+      assert_equal %w[3], File.readlines(tempname, chomp: true)
+    end
+    tmux.send_keys :Down
+    wait do
+      assert_equal %w[3 4], File.readlines(tempname, chomp: true)
+    end
+    tmux.send_keys :Space, :Down
+    tmux.until { |lines| assert_includes lines, '> 5' }
+    tmux.send_keys :Down
+    tmux.until { |lines| assert_includes lines, '> 6' }
+    tmux.send_keys :Space
+    wait do
+      assert_equal %w[3 4 6], File.readlines(tempname, chomp: true)
+    end
+  end
+
   def test_preview_flags
     tmux.send_keys %(seq 10 | sed 's/^/:: /; s/$/  /' |
         #{FZF} --multi --preview 'echo {{2}/{s2}/{+2}/{+s2}/{q}/{n}/{+n}}'), :Enter
@@ -1794,6 +1865,67 @@ class TestGoFZF < TestBase
     tmux.until { |lines| assert_equal '>', lines.last }
   end
 
+  def test_change_and_transform_header
+    [
+      'space:change-header:$(seq 4)',
+      'space:transform-header:seq 4'
+    ].each_with_index do |binding, i|
+      tmux.send_keys %(seq 3 | #{FZF} --header-lines 2 --header bar --bind "#{binding}"), :Enter
+      expected = <<~OUTPUT
+        > 3
+          2
+          1
+          bar
+          1/1
+        >
+      OUTPUT
+      tmux.until { assert_block(expected, _1) }
+      tmux.send_keys :Space
+      expected = <<~OUTPUT
+        > 3
+          2
+          1
+          1
+          2
+          3
+          4
+          1/1
+        >
+      OUTPUT
+      tmux.until { assert_block(expected, _1) }
+      next unless i.zero?
+
+      teardown
+      setup
+    end
+  end
+
+  def test_change_header
+    tmux.send_keys %(seq 3 | #{FZF} --header-lines 2 --header bar --bind "space:change-header:$(seq 4)"), :Enter
+    expected = <<~OUTPUT
+      > 3
+        2
+        1
+        bar
+        1/1
+      >
+    OUTPUT
+    tmux.until { assert_block(expected, _1) }
+    tmux.send_keys :Space
+    expected = <<~OUTPUT
+      > 3
+        2
+        1
+        1
+        2
+        3
+        4
+        1/1
+      >
+    OUTPUT
+    tmux.until { assert_block(expected, _1) }
+  end
+
   def test_change_query
     tmux.send_keys %(: | #{FZF} --query foo --bind space:change-query:foobar), :Enter
     tmux.until { |lines| assert_equal 0, lines.item_count }
@@ -1859,7 +1991,7 @@ class TestGoFZF < TestBase
 
   def test_keep_right
     tmux.send_keys "seq 10000 | #{FZF} --read0 --keep-right", :Enter
-    tmux.until { |lines| assert lines.any_include?('9999 10000') }
+    tmux.until { |lines| assert lines.any_include?('9999␊10000') }
   end
 
   def test_backward_eof
@@ -2087,11 +2219,7 @@ class TestGoFZF < TestBase
     wait { refute system("pgrep -f #{script}") }
   ensure
     system("pkill -9 -f #{script}")
-    begin
+    FileUtils.rm_f(script)
-      File.unlink(script)
-    rescue StandardError
-      nil
-    end
   end
 
   def test_kill_default_command_on_accept
@@ -2109,11 +2237,7 @@ class TestGoFZF < TestBase
     wait { refute system("pgrep -f #{script}") }
   ensure
     system("pkill -9 -f #{script}")
-    begin
+    FileUtils.rm_f(script)
-      File.unlink(script)
-    rescue StandardError
-      nil
-    end
   end
 
   def test_kill_reload_command_on_abort
@@ -2134,11 +2258,7 @@ class TestGoFZF < TestBase
     wait { refute system("pgrep -f #{script}") }
   ensure
     system("pkill -9 -f #{script}")
-    begin
+    FileUtils.rm_f(script)
-      File.unlink(script)
-    rescue StandardError
-      nil
-    end
   end
 
   def test_kill_reload_command_on_accept
@@ -2158,11 +2278,7 @@ class TestGoFZF < TestBase
     wait { refute system("pgrep -f #{script}") }
   ensure
     system("pkill -9 -f #{script}")
-    begin
+    FileUtils.rm_f(script)
-      File.unlink(script)
-    rescue StandardError
-      nil
-    end
   end
 
   def test_preview_header
@@ -2574,11 +2690,17 @@ class TestGoFZF < TestBase
   end
 
   def test_listen
-    tmux.send_keys 'seq 10 | fzf --listen 6266', :Enter
+    { '--listen 6266' => -> { URI('http://localhost:6266') },
-    tmux.until { |lines| assert_equal 10, lines.item_count }
+      "--listen --sync --bind 'start:execute-silent:echo $FZF_PORT > /tmp/fzf-port'" =>
-    Net::HTTP.post(URI('http://localhost:6266'), 'change-query(yo)+reload(seq 100)+change-prompt:hundred> ')
+        -> { URI("http://localhost:#{File.read('/tmp/fzf-port').chomp}") } }.each do |opts, fn|
-    tmux.until { |lines| assert_equal 100, lines.item_count }
+      tmux.send_keys "seq 10 | fzf #{opts}", :Enter
-    tmux.until { |lines| assert_equal 'hundred> yo', lines[-1] }
+      tmux.until { |lines| assert_equal 10, lines.item_count }
+      Net::HTTP.post(fn.call, 'change-query(yo)+reload(seq 100)+change-prompt:hundred> ')
+      tmux.until { |lines| assert_equal 100, lines.item_count }
+      tmux.until { |lines| assert_equal 'hundred> yo', lines[-1] }
+      teardown
+      setup
+    end
   end
 
   def test_toggle_alternative_preview_window
@@ -2588,6 +2710,162 @@ class TestGoFZF < TestBase
     tmux.send_keys :Space
     tmux.until { |lines| assert_includes lines, '/1/1/' }
   end
+
+  def test_become
+    tmux.send_keys "seq 100 | #{FZF} --bind 'enter:become:seq {} | #{FZF}'", :Enter
+    tmux.until { |lines| assert_equal 100, lines.item_count }
+    tmux.send_keys 999
+    tmux.until { |lines| assert_equal 0, lines.match_count }
+    tmux.send_keys :Enter
+    tmux.until { |lines| assert_equal 0, lines.match_count }
+    tmux.send_keys :BSpace
+    tmux.until { |lines| assert_equal 1, lines.match_count }
+    tmux.send_keys :Enter
+    tmux.until { |lines| assert_equal 99, lines.item_count }
+  end
+
+  def test_no_extra_newline_issue_3209
+    tmux.send_keys(%(seq 100 | #{FZF} --height 10 --preview-window up,wrap --preview 'printf "─%.0s" $(seq 1 "$((FZF_PREVIEW_COLUMNS - 5))"); printf $"\\e[7m%s\\e[0m" title; echo; echo something'), :Enter)
+    expected = <<~OUTPUT
+      ╭──────────
+      │ ─────────
+      │ something
+      │
+      ╰──────────
+        3
+        2
+      > 1
+        100/100 ─
+      >
+    OUTPUT
+    tmux.until { assert_block(expected, _1) }
+  end
+
+  def test_track
+    tmux.send_keys "seq 1000 | #{FZF} --query 555 --track --bind t:toggle-track", :Enter
+    tmux.until do |lines|
+      assert_equal 1, lines.match_count
+      assert_includes lines, '> 555'
+    end
+    tmux.send_keys :BSpace
+    index = tmux.until do |lines|
+      assert_equal 28, lines.match_count
+      assert_includes lines, '> 555'
+    end.index('> 555')
+    tmux.send_keys :BSpace
+    tmux.until do |lines|
+      assert_equal 271, lines.match_count
+      assert_equal '> 555', lines[index]
+    end
+    tmux.send_keys :BSpace
+    tmux.until do |lines|
+      assert_equal 1000, lines.match_count
+      assert_equal '> 555', lines[index]
+    end
+    tmux.send_keys '555'
+    tmux.until do |lines|
+      assert_equal 1, lines.match_count
+      assert_includes lines, '> 555'
+      assert_includes lines[-2], '+T'
+    end
+    tmux.send_keys 't'
+    tmux.until do |lines|
+      refute_includes lines[-2], '+T'
+    end
+    tmux.send_keys :BSpace
+    tmux.until do |lines|
+      assert_equal 28, lines.match_count
+      assert_includes lines, '> 55'
+    end
+    tmux.send_keys :BSpace
+    tmux.until do |lines|
+      assert_equal 271, lines.match_count
+      assert_includes lines, '> 5'
+    end
+    tmux.send_keys 't'
+    tmux.until do |lines|
+      assert_includes lines[-2], '+T'
+    end
+    tmux.send_keys :BSpace
+    tmux.until do |lines|
+      assert_equal 1000, lines.match_count
+      assert_includes lines, '> 5'
+    end
+  end
+
+  def test_track_action
+    tmux.send_keys "seq 1000 | #{FZF} --query 555 --bind t:track", :Enter
+    tmux.until do |lines|
+      assert_equal 1, lines.match_count
+      assert_includes lines, '> 555'
+    end
+    tmux.send_keys :BSpace
+    tmux.until do |lines|
+      assert_equal 28, lines.match_count
+      assert_includes lines, '> 55'
+    end
+    tmux.send_keys :t
+    tmux.until do |lines|
+      assert_includes lines[-2], '+T'
+    end
+    tmux.send_keys :BSpace
+    tmux.until do |lines|
+      assert_equal 271, lines.match_count
+      assert_includes lines, '> 55'
+    end
+
+    # Automatically disabled when the tracking item is no longer visible
+    tmux.send_keys '4'
+    tmux.until do |lines|
+      assert_equal 28, lines.match_count
+      refute_includes lines[-2], '+T'
+    end
+    tmux.send_keys :BSpace
+    tmux.until do |lines|
+      assert_equal 271, lines.match_count
+      assert_includes lines, '> 5'
+    end
+    tmux.send_keys :t
+    tmux.until do |lines|
+      assert_includes lines[-2], '+T'
+    end
+    tmux.send_keys :Up
+    tmux.until do |lines|
+      refute_includes lines[-2], '+T'
+    end
+  end
+
+  def test_one_and_zero
+    tmux.send_keys "seq 10 | #{FZF} --bind 'zero:preview(echo no match),one:preview(echo {} is the only match)'", :Enter
+    tmux.send_keys '1'
+    tmux.until do |lines|
+      assert_equal 2, lines.match_count
+      refute(lines.any? { _1.include?('only match') })
+      refute(lines.any? { _1.include?('no match') })
+    end
+    tmux.send_keys '0'
+    tmux.until do |lines|
+      assert_equal 1, lines.match_count
+      assert(lines.any? { _1.include?('only match') })
+    end
+    tmux.send_keys '0'
+    tmux.until do |lines|
+      assert_equal 0, lines.match_count
+      assert(lines.any? { _1.include?('no match') })
+    end
+  end
+
+  def test_height_range_with_exit_0
+    tmux.send_keys "seq 10 | #{FZF} --height ~10% --exit-0", :Enter
+    tmux.until { |lines| assert_equal 10, lines.item_count }
+    tmux.send_keys :c
+    tmux.until { |lines| assert_equal 0, lines.match_count }
+  end
+
+  def test_reload_and_change
+    tmux.send_keys "(echo foo; echo bar) | #{FZF} --bind 'load:reload-sync(sleep 60)+change-query(bar)'", :Enter
+    tmux.until { |lines| assert_equal 1, lines.match_count }
+  end
 end
 
 module TestShell
@@ -2716,9 +2994,9 @@ module TestShell
     tmux.send_keys 'C-r'
     tmux.until { |lines| assert_equal '>', lines[-1] }
     tmux.send_keys 'foo bar'
-    tmux.until { |lines| assert lines[-3]&.end_with?('bar"') }
+    tmux.until { |lines| assert lines[-3]&.match?(/bar"␊?/) }
     tmux.send_keys :Enter
-    tmux.until { |lines| assert lines[-1]&.end_with?('bar"') }
+    tmux.until { |lines| assert lines[-1]&.match?(/bar"␊?/) }
     tmux.send_keys :Enter
     tmux.until { |lines| assert_equal %w[foo bar], lines[-2..] }
   end

typos.toml

@@ -0,0 +1,6 @@
+# See https://github.com/crate-ci/typos/blob/master/docs/reference.md to configure typos
+[default.extend-words]
+ba = "ba"
+fo = "fo"
+enew = "enew"
+tabe = "tabe"