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Experimental support for Kitty image protocol in preview window

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Close #3228

* Works inside and outside of tmux
* There is a problem where fzf unnecessarily displays the scroll offset
  indicator at the topbright of the screen when the image just fits the
  preview window. This is because `kitty icat` generates an extra line
  after the image area.

    # A 5-row images; an extra row at the end confuses fzf
    ["\e_Ga ... \e[9C􎻮̅̅ࠪ􎻮̅̍ࠪ􎻮̅̎ࠪ􎻮̅̐ࠪ􎻮̅̒ࠪ􎻮̅̽ࠪ􎻮̅̾ࠪ􎻮̅̿ࠪ􎻮̅͆ࠪ􎻮̅͊ࠪ􎻮̅͋ࠪ\n",
     "\r\e[9C􎻮̍̅ࠪ􎻮̍̍ࠪ􎻮̍̎ࠪ􎻮̍̐ࠪ􎻮̍̒ࠪ􎻮̍̽ࠪ􎻮̍̾ࠪ􎻮̍̿ࠪ􎻮̍͆ࠪ􎻮̍͊ࠪ􎻮̍͋ࠪ\n",
     "\r\e[9C􎻮̎̅ࠪ􎻮̎̍ࠪ􎻮̎̎ࠪ􎻮̎̐ࠪ􎻮̎̒ࠪ􎻮̎̽ࠪ􎻮̎̾ࠪ􎻮̎̿ࠪ􎻮̎͆ࠪ􎻮̎͊ࠪ􎻮̎͋ࠪ\n",
     "\r\e[9C􎻮̐̅ࠪ􎻮̐̍ࠪ􎻮̐̎ࠪ􎻮̐̐ࠪ􎻮̐̒ࠪ􎻮̐̽ࠪ􎻮̐̾ࠪ􎻮̐̿ࠪ􎻮̐͆ࠪ􎻮̐͊ࠪ􎻮̐͋ࠪ\n",
     "\r\e[9C􎻮̒̅ࠪ􎻮̒̍ࠪ􎻮̒̎ࠪ􎻮̒̐ࠪ􎻮̒̒ࠪ􎻮̒̽ࠪ􎻮̒̾ࠪ􎻮̒̿ࠪ􎻮̒͆ࠪ􎻮̒͊ࠪ􎻮̒͋ࠪ\n",
     "\r\e[39m\e8"]

* Example:

  fzf --preview='
    if file --mime-type {} | grep -qF 'image/'; then
      # --transfer-mode=memory is the fastest option but if you want fzf to be able
      # to redraw the image on terminal resize or on 'change-preview-window',
      # you need to use --transfer-mode=stream.
      kitty icat --clear --transfer-mode=memory --stdin=no --place=${FZF_PREVIEW_COLUMNS}x${FZF_PREVIEW_LINES}@0x0 {}
    else
      bat --color=always {}
    fi
  '
This commit is contained in:
Junegunn Choi
2023-10-07 18:20:27 +09:00
parent 0f15f1ab73
commit d8188fce7b
6 changed files with 41 additions and 1 deletions
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17
src/terminal.go
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@@ -51,6 +51,7 @@ var whiteSuffix *regexp.Regexp
var offsetComponentRegex *regexp.Regexp
var offsetTrimCharsRegex *regexp.Regexp
var activeTempFiles []string
var passThroughRegex *regexp.Regexp
const clearCode string = "\x1b[2J"
@@ -60,6 +61,11 @@ func init() {
offsetComponentRegex = regexp.MustCompile(`([+-][0-9]+)|(-?/[1-9][0-9]*)`)
offsetTrimCharsRegex = regexp.MustCompile(`[^0-9/+-]`)
activeTempFiles = []string{}
// Parts of the preview output that should be passed through to the terminal
// * https://github.com/tmux/tmux/wiki/FAQ#what-is-the-passthrough-escape-sequence-and-how-do-i-use-it
// * https://sw.kovidgoyal.net/kitty/graphics-protocol
passThroughRegex = regexp.MustCompile(`\x1bPtmux;\x1b\x1b.*?[^\x1b]\x1b\\|\x1b_G.*?\x1b\\`)
}
type jumpMode int
@@ -1958,7 +1964,13 @@ func (t *Terminal) renderPreviewText(height int, lines []string, lineNo int, unc
if ansi != nil {
ansi.lbg = -1
}
line = strings.TrimRight(line, "\r\n")
passThroughs := passThroughRegex.FindAllString(line, -1)
if passThroughs != nil {
line = passThroughRegex.ReplaceAllString(line, "")
}
line = strings.TrimLeft(strings.TrimRight(line, "\r\n"), "\r")
if lineNo >= height || t.pwindow.Y() == height-1 && t.pwindow.X() > 0 {
t.previewed.filled = true
t.previewer.scrollable = true
@@ -1971,6 +1983,9 @@ func (t *Terminal) renderPreviewText(height int, lines []string, lineNo int, unc
t.renderPreviewSpinner()
t.pwindow.Move(y, x)
}
for _, passThrough := range passThroughs {
t.tui.PassThrough(passThrough)
}
var fillRet tui.FillReturn
prefixWidth := 0
_, _, ansi = extractColor(line, ansi, func(str string, ansi *ansiState) bool {