Merge pull request 'feat(fzf): add preview, dirs, and image support to @@ inline picker' (#110) from enhance-fzf-inline-picker-preview into main

Reviewed-on: #110

functions/__fzf_inline_picker.fish

@@ -7,9 +7,12 @@
 # DESCRIPTION
 #   Bound to the @ key. Self-inserts @ normally; on a second consecutive @
 #   (detected by looking behind at the current token rather than making fish
-#   buffer ahead for a chord), opens an interactive fzf session and replaces
-#   the bare @ with the selected item. Cancelling leaves a literal @@ behind.
-#   Repaints the prompt after selection or cancellation.
+#   buffer ahead for a chord), opens an interactive fzf session listing both
+#   files and directories under the current directory, with a preview pane
+#   (bat-highlighted for text, image-rendered for pictures via
+#   _fzf_preview_file), and replaces the bare @ with the selected item.
+#   Cancelling leaves a literal @@ behind. Repaints the prompt after
+#   selection or cancellation.
 #
 # EXIT STATUS
 #   0  Always
@@ -20,7 +23,22 @@
 #   # (e.g. a trailing /subdir).
 function __fzf_inline_picker
     if test (commandline -t) = @
-        set -l selection (fzf)
+        # Directly use fd binary to avoid output buffering delay caused by a fd
+        # alias, if any. Debian-based distros install fd as fdfind.
+        set -f fd_cmd (command -v fdfind || command -v fd || echo "fd")
+        set -f --append fd_cmd --color=always $fzf_fd_opts
+
+        set -l selection ($fd_cmd 2>/dev/null | _fzf_wrapper --ansi \
+            --height=90% \
+            --layout=reverse \
+            --border=rounded \
+            --border-label=' Insert Path ' \
+            --prompt='@@ -> ' \
+            --header='Enter: Insert  Ctrl-/: Toggle Preview  Esc: Cancel' \
+            --bind='ctrl-/:toggle-preview' \
+            --preview='_fzf_preview_file {}' \
+            --preview-window='right:50%:wrap:border-left')
+
         if test -n "$selection"
             commandline -t -- (string escape -- $selection)
         else

functions/_fzf_preview_file.fish

@@ -17,6 +17,8 @@ function _fzf_preview_file --description "Print a preview for the given file bas
         if set --query fzf_preview_file_cmd
             # need to escape quotes to make sure eval receives file_path as a single arg
             eval "$fzf_preview_file_cmd '$file_path'"
+        else if command -q file; and string match -q 'image/*' -- (command file --brief --mime-type -- "$file_path" 2>/dev/null)
+            _fzf_preview_image "$file_path"
         else
             bat --style=numbers --color=always "$file_path"
         end

functions/_fzf_preview_image.fish

@@ -0,0 +1,39 @@
+# helper function for _fzf_preview_file
+function _fzf_preview_image --description "Render an image preview using the best available tool for the current terminal."
+    set -f file_path $argv
+
+    set -l cols (set --query FZF_PREVIEW_COLUMNS; and echo $FZF_PREVIEW_COLUMNS; or echo 80)
+    set -l lines (set --query FZF_PREVIEW_LINES; and echo $FZF_PREVIEW_LINES; or echo 24)
+    set -l left (set --query FZF_PREVIEW_LEFT; and echo $FZF_PREVIEW_LEFT; or echo 0)
+    set -l top (set --query FZF_PREVIEW_TOP; and echo $FZF_PREVIEW_TOP; or echo 0)
+
+    # Terminals that implement the kitty graphics protocol (kitty itself,
+    # WezTerm, and Ghostty) can render via `kitten icat` even when it's not
+    # the active terminal, since `kitten` is just an escape-sequence emitter.
+    set -l kitty_capable 0
+    if set --query KITTY_WINDOW_ID
+        or test "$TERM" = xterm-kitty
+        or contains -- "$TERM_PROGRAM" WezTerm ghostty
+        or set --query GHOSTTY_RESOURCES_DIR
+        set kitty_capable 1
+    end
+
+    if test $kitty_capable -eq 1; and command -q kitten
+        # --place is measured from the top-left of the whole terminal, not the
+        # preview pane, so FZF_PREVIEW_LEFT/TOP (added to fzf specifically for
+        # this integration) are required to land the image in the right spot.
+        command kitten icat --clear --transfer-mode=memory --unicode-placeholder \
+            --stdin=no --place="$cols"x"$lines"@"$left"x"$top" -- "$file_path" 2>/dev/null
+    else if command -q chafa
+        command chafa --size="$cols"x"$lines" -- "$file_path"
+    else if command -q viu
+        command viu --width $cols -- "$file_path"
+    else if command -q timg
+        command timg -g "$cols"x"$lines" -- "$file_path"
+    else
+        set_color yellow
+        echo "No image preview tool available (install kitty, chafa, viu, or timg)."
+        set_color normal
+        command file --brief -- "$file_path"
+    end
+end