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Implement streaming preview window (#2215)

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Fix #2212

    # Will start rendering after 200ms, update every 100ms
    fzf --preview 'for i in $(seq 100); do echo $i; sleep 0.01; done'

    # Should print "Loading .." message after 500ms
    fzf --preview 'sleep 1; for i in $(seq 100); do echo $i; sleep 0.01; done'

    # The first line should appear after 200ms
    fzf --preview 'date; sleep 2; date'

    # Should not render before enough lines for the scroll offset are ready
    rg --line-number --no-heading --color=always ^ |
      fzf --delimiter : --ansi --preview-window '+{2}-/2' \
          --preview 'sleep 1; bat --style=numbers --color=always --pager=never --highlight-line={2} {1}'
This commit is contained in:
Junegunn Choi
2020-10-18 17:03:33 +09:00
committed by GitHub
parent 305896fcb3
commit faf68dbc5c
8 changed files with 251 additions and 120 deletions
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16
README.md
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@@ -582,9 +582,9 @@ and fzf will warn you about it. To suppress the warning message, we added
### Preview window
When the `--preview` option is set, fzf automatically starts an external process
with the current line as the argument and shows the result in the split window.
Your `$SHELL` is used to execute the command with `$SHELL -c COMMAND`.
When the `--preview` option is set, fzf automatically starts an external process
with the current line as the argument and shows the result in the split window.
Your `$SHELL` is used to execute the command with `$SHELL -c COMMAND`.
The window can be scrolled using the mouse or custom key bindings.
```bash
@@ -592,16 +592,8 @@ The window can be scrolled using the mouse or custom key bindings.
fzf --preview 'cat {}'
```
Since the preview window is updated only after the process is complete, it's
important that the command finishes quickly.
```bash
# Use head instead of cat so that the command doesn't take too long to finish
fzf --preview 'head -100 {}'
```
Preview window supports ANSI colors, so you can use any program that
syntax-highlights the content of a file, such as
syntax-highlights the content of a file, such as
[Bat](https://github.com/sharkdp/bat) or
[Highlight](http://www.andre-simon.de/doku/highlight/en/highlight.php):