[vim] Native --tmux fix for Neovim

plugin/fzf.vim

@@ -592,7 +592,7 @@ function! s:fzf_tmux(dict)
   end
 
   " Using native --tmux option
-  let in = (has_key(a:dict, 'source') ? '' : ' < /dev/tty')
+  let in = (has_key(a:dict, 'source') ? '' : ' --force-tty-in')
   return printf('%s --tmux %s%s', fzf#shellescape(fzf#exec()), size, in)
 endfunction
 

src/options.go

@@ -396,6 +396,7 @@ type Options struct {
 	Output       chan string
 	NoWinpty     bool
 	Tmux         *tmuxOptions
+	ForceTtyIn   bool
 	ProxyScript  string
 	Bash         bool
 	Zsh          bool
@@ -1949,6 +1950,12 @@ func parseOptions(opts *Options, allArgs []string) error {
 			}
 		case "--no-tmux":
 			opts.Tmux = nil
+		case "--force-tty-in":
+			// NOTE: We need this because `system('fzf --tmux < /dev/tty')` doesn't
+			// work on Neovim. Same as '-' option of fzf-tmux.
+			opts.ForceTtyIn = true
+		case "--no-force-tty-in":
+			opts.ForceTtyIn = false
 		case "--proxy-script":
 			if opts.ProxyScript, err = nextString(allArgs, &i, ""); err != nil {
 				return err

src/proxy.go

@@ -59,8 +59,8 @@ func runProxy(commandPrefix string, cmdBuilder func(temp string) *exec.Cmd, opts
 	}()
 
 	var command string
-	commandPrefix += ` --proxy-script "$0"`
+	commandPrefix += ` --no-force-tty-in --proxy-script "$0"`
-	if opts.Input == nil && util.IsTty(os.Stdin) {
+	if opts.Input == nil && (opts.ForceTtyIn || util.IsTty(os.Stdin)) {
 		command = fmt.Sprintf(`%s > %q`, commandPrefix, output)
 	} else {
 		input, err := fifo("proxy-input")