Support zellij floating pane via --popup (new name for --tmux)

CHANGELOG.md

@@ -3,6 +3,10 @@ CHANGELOG
 
 0.71.0
 ------
+- Added `--popup` as a new name for `--tmux` with Zellij support
+    - `--popup` starts fzf in a tmux popup or a Zellij floating pane
+    - `--tmux` is now an alias for `--popup`
+    - Requires tmux 3.3+ or Zellij 0.44+
 - Cross-reload item identity with `--id-nth`
     - Added `--id-nth=NTH` to define item identity fields for cross-reload operations
     - When a `reload` is triggered with tracking enabled, fzf searches for the tracked item by its identity fields in the new list.

man/man1/fzf.1

@@ -415,25 +415,26 @@ layout options so that the specified number of items are visible in the list
 section (default: \fB10+\fR).
 Ignored when \fB\-\-height\fR is not specified or set as an absolute value.
 .TP
-.BI "\-\-tmux" "[=[center|top|bottom|left|right][,SIZE[%]][,SIZE[%]][,border-native]]"
-Start fzf in a tmux popup (default \fBcenter,50%\fR). Requires tmux 3.3 or
-later. This option is ignored if you are not running fzf inside tmux.
+.BI "\-\-popup" "[=[center|top|bottom|left|right][,SIZE[%]][,SIZE[%]][,border-native]]"
+Start fzf in a tmux popup or in a Zellij floating pane (default
+\fBcenter,50%\fR). Requires tmux 3.3+ or Zellij 0.44+. This option is ignored if you
+are not running fzf inside tmux or Zellij. \fB\-\-tmux\fR is an alias for this option.
 
 e.g.
   \fB# Popup in the center with 70% width and height
-  fzf \-\-tmux 70%
+  fzf \-\-popup 70%
 
   # Popup on the left with 40% width and 100% height
-  fzf \-\-tmux right,40%
+  fzf \-\-popup right,40%
 
   # Popup on the bottom with 100% width and 30% height
-  fzf \-\-tmux bottom,30%
+  fzf \-\-popup bottom,30%
 
   # Popup on the top with 80% width and 40% height
-  fzf \-\-tmux top,80%,40%
+  fzf \-\-popup top,80%,40%
 
-  # Popup with a native tmux border in the center with 80% width and height
-  fzf \-\-tmux center,80%,border\-native\fR
+  # Popup with a native tmux or Zellij border in the center with 80% width and height
+  fzf \-\-popup center,80%,border\-native\fR
 
 .SS LAYOUT
 .TP

src/core.go

@@ -56,6 +56,9 @@ func Run(opts *Options) (int, error) {
 		if opts.useTmux() {
 			return runTmux(os.Args, opts)
 		}
+		if opts.useZellij() {
+			return runZellij(os.Args, opts)
+		}
 
 		if needWinpty(opts) {
 			return runWinpty(os.Args, opts)

src/options.go

@@ -75,9 +75,10 @@ Usage: fzf [options]
     --min-height=HEIGHT[+]   Minimum height when --height is given as a percentage.
                              Add '+' to automatically increase the value
                              according to the other layout options (default: 10+).
-    --tmux[=OPTS]            Start fzf in a tmux popup (requires tmux 3.3+)
+    --popup[=OPTS]           Start fzf in a popup window (requires tmux 3.3+ or Zellij 0.44+)
                              [center|top|bottom|left|right][,SIZE[%]][,SIZE[%]]
                              [,border-native] (default: center,50%)
+    --tmux[=OPTS]            Alias for --popup
 
   LAYOUT
     --layout=LAYOUT          Choose layout: [default|reverse|reverse-list]
@@ -417,7 +418,7 @@ func parseTmuxOptions(arg string, index int) (*tmuxOptions, error) {
 	var err error
 	opts := defaultTmuxOptions(index)
 	tokens := splitRegexp.Split(arg, -1)
-	errorToReturn := errors.New("invalid tmux option: " + arg + " (expected: [center|top|bottom|left|right][,SIZE[%]][,SIZE[%][,border-native]])")
+	errorToReturn := errors.New("invalid popup option: " + arg + " (expected: [center|top|bottom|left|right][,SIZE[%]][,SIZE[%][,border-native]])")
 	if len(tokens) == 0 || len(tokens) > 4 {
 		return nil, errorToReturn
 	}
@@ -2636,7 +2637,7 @@ func parseOptions(index *int, opts *Options, allArgs []string) error {
 			opts.Version = true
 		case "--no-winpty":
 			opts.NoWinpty = true
-		case "--tmux":
+		case "--tmux", "--popup":
 			given, str := optionalNextString()
 			if given {
 				if opts.Tmux, err = parseTmuxOptions(str, index); err != nil {
@@ -2645,7 +2646,7 @@ func parseOptions(index *int, opts *Options, allArgs []string) error {
 			} else {
 				opts.Tmux = defaultTmuxOptions(index)
 			}
-		case "--no-tmux":
+		case "--no-tmux", "--no-popup":
 			opts.Tmux = nil
 		case "--tty-default":
 			if opts.TtyDefault, err = nextString("tty device name required"); err != nil {
@@ -3627,6 +3628,10 @@ func (opts *Options) useTmux() bool {
 	return opts.Tmux != nil && len(os.Getenv("TMUX")) > 0 && opts.Tmux.index >= opts.Height.index
 }
 
+func (opts *Options) useZellij() bool {
+	return opts.Tmux != nil && len(os.Getenv("ZELLIJ")) > 0 && opts.Tmux.index >= opts.Height.index
+}
+
 func (opts *Options) noSeparatorLine() bool {
 	if opts.Inputless {
 		return true

src/terminal.go

@@ -2243,7 +2243,7 @@ func (t *Terminal) resizeWindows(forcePreview bool, redrawBorder bool) {
 	width := screenWidth - marginInt[1] - marginInt[3]
 	height := screenHeight - marginInt[0] - marginInt[2]
 
-	t.prevLines = make([]itemLine, screenHeight)
+	t.prevLines = make([]itemLine, max(1, screenHeight))
 	if t.border != nil && redrawBorder {
 		t.border = nil
 	}

src/tmux.go

@@ -27,7 +27,7 @@ func runTmux(args []string, opts *Options) (int, error) {
 	for _, arg := range append(args, rest...) {
 		argStr += " " + escapeSingleQuote(arg)
 	}
-	argStr += ` --no-tmux --no-height`
+	argStr += ` --no-popup --no-height`
 
 	// Get current directory
 	dir, err := os.Getwd()

src/zellij.go

@@ -0,0 +1,67 @@
+package fzf
+
+import (
+	"os"
+	"os/exec"
+
+	"github.com/junegunn/fzf/src/tui"
+)
+
+func runZellij(args []string, opts *Options) (int, error) {
+	// Prepare arguments
+	fzf, rest := args[0], args[1:]
+	args = []string{"--bind=ctrl-z:ignore"}
+	if !opts.Tmux.border && (opts.BorderShape == tui.BorderUndefined || opts.BorderShape == tui.BorderLine) {
+		if tui.DefaultBorderShape == tui.BorderRounded {
+			rest = append(rest, "--border=rounded")
+		} else {
+			rest = append(rest, "--border=sharp")
+		}
+	}
+	if opts.Tmux.border && opts.Margin == defaultMargin() {
+		args = append(args, "--margin=0,1")
+	}
+	argStr := escapeSingleQuote(fzf)
+	for _, arg := range append(args, rest...) {
+		argStr += " " + escapeSingleQuote(arg)
+	}
+	argStr += ` --no-popup --no-height`
+
+	// Get current directory
+	dir, err := os.Getwd()
+	if err != nil {
+		dir = "."
+	}
+
+	zellijArgs := []string{
+		"run", "--floating", "--close-on-exit", "--block-until-exit",
+		"--cwd", dir,
+	}
+	if !opts.Tmux.border {
+		zellijArgs = append(zellijArgs, "--borderless", "true")
+	}
+	switch opts.Tmux.position {
+	case posUp:
+		zellijArgs = append(zellijArgs, "-y", "0")
+	case posDown:
+		zellijArgs = append(zellijArgs, "-y", "9999")
+	case posLeft:
+		zellijArgs = append(zellijArgs, "-x", "0")
+	case posRight:
+		zellijArgs = append(zellijArgs, "-x", "9999")
+	case posCenter:
+		// Zellij centers floating panes by default
+	}
+	zellijArgs = append(zellijArgs, "--width", opts.Tmux.width.String())
+	zellijArgs = append(zellijArgs, "--height", opts.Tmux.height.String())
+	zellijArgs = append(zellijArgs, "--")
+
+	return runProxy(argStr, func(temp string, needBash bool) (*exec.Cmd, error) {
+		sh, err := sh(needBash)
+		if err != nil {
+			return nil, err
+		}
+		zellijArgs = append(zellijArgs, sh, temp)
+		return exec.Command("zellij", zellijArgs...), nil
+	}, opts, true)
+}