Do not 'become' inside a tmux popup

fzf --tmux center --bind 'enter:become:vim {}'

src/constants.go

@@ -67,9 +67,9 @@ const (
 )
 
 const (
-	ExitCancel    = -1
 	ExitOk        = 0
 	ExitNoMatch   = 1
 	ExitError     = 2
+	ExitBecome    = 126
 	ExitInterrupt = 130
 )

src/options.go

@@ -381,6 +381,7 @@ type Options struct {
 	Input        chan string
 	Output       chan string
 	Tmux         *tmuxOptions
+	TmuxScript   string
 	Bash         bool
 	Zsh          bool
 	Fish         bool
@@ -1882,6 +1883,10 @@ func parseOptions(opts *Options, allArgs []string) error {
 			}
 		case "--no-tmux":
 			opts.Tmux = nil
+		case "--tmux-script":
+			if opts.TmuxScript, err = nextString(allArgs, &i, ""); err != nil {
+				return err
+			}
 		case "-x", "--extended":
 			opts.Extended = true
 		case "-e", "--exact":

src/terminal.go

@@ -312,6 +312,7 @@ type Terminal struct {
 	forcePreview       bool
 	clickHeaderLine    int
 	clickHeaderColumn  int
+	tmuxScript         string
 }
 
 type selectedItem struct {
@@ -351,6 +352,7 @@ const (
 	reqPreviewDisplay
 	reqPreviewRefresh
 	reqPreviewDelayed
+	reqBecome
 	reqQuit
 	reqFatal
 )
@@ -782,6 +784,7 @@ func NewTerminal(opts *Options, eventBox *util.EventBox, executor *util.Executor
 		jumpLabels:         opts.JumpLabels,
 		printer:            opts.Printer,
 		printsep:           opts.PrintSep,
+		tmuxScript:         opts.TmuxScript,
 		merger:             EmptyMerger(0),
 		selected:           make(map[int32]selectedItem),
 		reqBox:             util.NewEventBox(),
@@ -3299,6 +3302,9 @@ func (t *Terminal) Loop() error {
 							return ExitOk
 						})
 						return
+					case reqBecome:
+						exit(func() int { return ExitBecome })
+						return
 					case reqQuit:
 						exit(func() int { return ExitInterrupt })
 						return
@@ -3473,7 +3479,14 @@ func (t *Terminal) Loop() error {
 					if t.history != nil {
 						t.history.append(string(t.input))
 					}
-					t.executor.Become(t.ttyin, t.environ(), command)
+
+					if len(t.tmuxScript) > 0 {
+						data := strings.Join(append([]string{command}, t.environ()...), "\x00")
+						os.WriteFile(t.tmuxScript, []byte(data), 0600)
+						req(reqBecome)
+					} else {
+						t.executor.Become(t.ttyin, t.environ(), command)
+					}
 				}
 			case actExecute, actExecuteSilent:
 				t.executeCommand(a.a, false, a.t == actExecuteSilent, false, false)

src/tmux.go

@@ -2,6 +2,7 @@ package fzf
 
 import (
 	"bufio"
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -45,6 +46,7 @@ func runTmux(args []string, opts *Options) (int, error) {
 		// %q formatting escapes $'foo\nbar' to "foo\nbar"
 		argStr += " " + escapeSingleQuote(arg)
 	}
+	argStr += ` --tmux-script "$0"`
 
 	// Build command
 	var command string
@@ -141,7 +143,26 @@ func runTmux(args []string, opts *Options) (int, error) {
 	cmd := exec.Command("tmux", tmuxArgs...)
 	if err := cmd.Run(); err != nil {
 		if exitError, ok := err.(*exec.ExitError); ok {
-			return exitError.ExitCode(), err
+			code := exitError.ExitCode()
+			if code == ExitBecome {
+				data, err := os.ReadFile(temp)
+				if err != nil {
+					return ExitError, err
+				}
+				elems := strings.Split(string(data), "\x00")
+				if len(elems) < 1 {
+					return ExitError, errors.New("invalid become command")
+				}
+				command := elems[0]
+				env := []string{}
+				if len(elems) > 1 {
+					env = elems[1:]
+				}
+				os.Remove(temp)
+				executor := util.NewExecutor(opts.WithShell)
+				executor.Become(tui.TtyIn(), env, command)
+			}
+			return code, err
 		}
 	}