Support zellij floating pane via --popup (new name for --tmux) (#4145)

src/zellij.go

@@ -0,0 +1,41 @@
+package fzf
+
+import (
+	"os/exec"
+)
+
+func runZellij(args []string, opts *Options) (int, error) {
+	argStr, dir := popupArgStr(args, opts)
+
+	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)
+}