add yay helpers

Examples.md

@@ -18,7 +18,7 @@ Table of Contents
   * [man pages](#man-pages)
 * Package management
   * [apt](#apt)
-  * [Pacman](#pacman)
+  * [Pacman/Yay](#pacman)
   * [NPM](#npm)
   * [Homebrew](#homebrew)
   * [Homebrew Cask](#homebrew-cask)
@@ -1786,15 +1786,59 @@ bindkey '^o' pick_torrent
 function in() {
     yay -Slq | fzf -q "$1" -m --preview 'yay -Si {1}'| xargs -ro yay -S
 }
-```
-
-```sh
 # Remove installed packages (change to pacman/AUR helper of your choice)
 function re() {
     yay -Qq | fzf -q "$1" -m --preview 'yay -Qi {1}' | xargs -ro yay -Rns
 }
 ```
 
+Shows version & repository, elaborate preview, bindings to show package in web, caches AUR packages list:
+```sh
+# Helper function to integrate yay and fzf
+yzf() {
+  pos=$1
+  shift
+  sed "s/ /\t/g" |
+    fzf --nth=$pos --multi --history="${FZF_HISTDIR:-$XDG_STATE_HOME/fzf}/history-yzf$pos" \
+      --preview-window=60%,border-left \
+      --bind="double-click:execute(xdg-open 'https://archlinux.org/packages/{$pos}'),alt-enter:execute(xdg-open 'https://aur.archlinux.org/packages?K={$pos}&SB=p&SO=d&PP=100')" \
+       "$@" | cut -f$pos | xargs
+}
+
+# Dev note: print -s adds a shell history entry
+
+# List installable packages into fzf and install selection
+yas() {
+  cache_dir="/tmp/yas-$USER"
+  test "$1" = "-y" && rm -rf "$cache_dir" && shift
+  mkdir -p "$cache_dir"
+  preview_cache="$cache_dir/preview_{2}"
+  list_cache="$cache_dir/list"
+  { test "$(cat "$list_cache$@" | wc -l)" -lt 50000 && rm "$list_cache$@"; } 2>/dev/null
+  pkg=$( (cat "$list_cache$@" 2>/dev/null || { pacman --color=always -Sl "$@"; yay --color=always -Sl aur "$@" } | sed 's/ [^ ]*unknown-version[^ ]*//' | tee "$list_cache$@") |
+    yzf 2 --tiebreak=index --preview="cat $preview_cache 2>/dev/null | grep -v 'Querying' | grep . || yay --color always -Si {2} | tee $preview_cache")
+  if test -n "$pkg"
+    then echo "Installing $pkg..."
+      cmd="yay -S $pkg"
+      print -s "$cmd"
+      eval "$cmd"
+      rehash
+  fi
+}
+# List installed packages into fzf and remove selection
+# Tip: use -e to list only explicitly installed packages
+yar() {
+  pkg=$(yay --color=always -Q "$@" | yzf 1 --tiebreak=length --preview="yay --color always -Qli {1}")
+  if test -n "$pkg"
+    then echo "Removing $pkg..."
+      cmd="yay -R --cascade --recursive $pkg"
+      print -s "$cmd"
+      eval "$cmd"
+  fi
+}
+
+```
+
 ### Clipboard
 Uses [wl-copy](https://github.com/bugaevc/wl-clipboard) to copy the current entry to the clipboard on Wayland: