[vim] Open fzf in a tmux or Zellij floating pane by default

The window fzf was started from stays visible, and can be used while fzf
runs, which a popup inside Vim cannot offer.

Only where the pane is not modal, so tmux 3.7 or above, or Zellij 0.44 or
above with fzf 0.71.0 or above. A tmux popup from 3.3 to 3.6 cannot be left,
and below 3.3 fzf goes through the fzf-tmux script, whose options are
spelled differently. Both keep the window inside Vim. An explicit popup
layout is unaffected and still works from 3.3.

fzf checks tmux before Zellij, so tmux wins when both are set.

g:fzf_layout still wins, so anyone who set it sees no change.

CHANGELOG.md

@@ -1,6 +1,23 @@
 CHANGELOG
 =========
 
+0.74.4
+------
+- Fixed an escape sequence split across reads being parsed as a fragment, which leaked the rest into the query (#4899)
+    - e.g. A terminal answering the startup `DECRQM` query late left `?2004;2$y`, CTRL-UP left `5A`, and SGR mouse input left `0;1;1M`
+- Fixed `--tiebreak=pathname` not detecting the last path separator when the line contains a non-ASCII character before it (#4902)
+- Vim plugin
+    - fzf no longer blocks the editor, so live previews keep working while fzf is open
+        - `fzf#run` returns an empty list when it runs fzf asynchronously. Use `sink`, `sinklist`, or `exit` to get the result
+    - The popup layout now works under Zellij
+    - Added `popup` as a synonym of the `tmux` layout key
+      ```vim
+      let g:fzf_layout = { 'popup': '90%,70%' }
+      ```
+    - fzf now opens in a tmux or Zellij floating pane by default, so the window it was started from stays visible and can be used while fzf is running
+        - Requires tmux 3.7+ or Zellij 0.44+
+        - Set `g:fzf_layout` to pick a different layout
+
 0.74.3
 ------
 - Performance optimizations for non-ASCII input

README-VIM.md

@@ -1,6 +1,26 @@
 FZF Vim integration
 ===================
 
+<!-- vim-markdown-toc GFM -->
+
+* [Installation](#installation)
+* [Summary](#summary)
+* [`:FZF[!]`](#fzf)
+    * [Configuration](#configuration)
+        * [Examples](#examples)
+            * [Explanation of `g:fzf_colors`](#explanation-of-gfzf_colors)
+* [`fzf#run`](#fzfrun)
+* [`fzf#wrap`](#fzfwrap)
+    * [Global options supported by `fzf#wrap`](#global-options-supported-by-fzfwrap)
+* [Tips](#tips)
+    * [fzf inside terminal buffer](#fzf-inside-terminal-buffer)
+    * [Starting fzf in a Vim popup window](#starting-fzf-in-a-vim-popup-window)
+    * [Starting fzf in a tmux/Zellij popup window](#starting-fzf-in-a-tmuxzellij-popup-window)
+    * [Hide statusline](#hide-statusline)
+* [License](#license)
+
+<!-- vim-markdown-toc -->
+
 Installation
 ------------
 
@@ -133,19 +153,35 @@ let g:fzf_action = {
   \ 'ctrl-v': 'vsplit' }
 
 " Default fzf layout
-" - Popup window (center of the screen)
+if exists('$TMUX') || exists('$ZELLIJ')
-let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
+  " The Vim plugin will try to open fzf in a tmux or Zellij popup
+  " if possible (requires recent fzf and tmux/zellij) using --popup option,
+  " with the following argument:
+  let g:fzf_layout = { 'popup': '90%,60%' }
+else
+  " If --popup option is not available, it will open in a popup window inside
+  " Vim (center of the screen)
+  let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
+endif
 
-" - Popup window (center of the current window)
+" Here are some more layout examples:
+
+" - Tmux or Zellij popup at the bottom 40%
+let g:fzf_layout = { 'popup': 'bottom,40%' }
+
+" - Tmux or Zellij popup at the top with a different size
+let g:fzf_layout = { 'popup': 'top,90%,40%' }
+
+" - Vim popup window: at the center of the current window (relative)
 let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6, 'relative': v:true } }
 
-" - Popup window (anchored to the bottom of the current window)
+" - Vim popup window: anchored to the bottom of the current window
 let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6, 'relative': v:true, 'yoffset': 1.0 } }
 
-" - down / up / left / right
+" - Vim split window: down / up / left / right
 let g:fzf_layout = { 'down': '40%' }
 
-" - Window using a Vim command
+" - Vim window using a Vim command
 let g:fzf_layout = { 'window': 'enew' }
 let g:fzf_layout = { 'window': '-tabnew' }
 let g:fzf_layout = { 'window': '10new' }
@@ -296,7 +332,7 @@ The following table summarizes the available options.
 | `options`                  | string/list   | Options to fzf                                                        |
 | `dir`                      | string        | Working directory                                                     |
 | `up`/`down`/`left`/`right` | number/string | (Layout) Window position and size (e.g. `20`, `50%`)                  |
-| `tmux`                     | string        | (Layout) `--tmux` options (e.g. `90%,70%`)                            |
+| `popup`/`tmux`             | string        | (Layout) `--popup` options (e.g. `90%,70%`)                           |
 | `window` (Vim 8 / Neovim)  | string        | (Layout) Command to open fzf window (e.g. `vertical aboveleft 30new`) |
 | `window` (Vim 8 / Neovim)  | dict          | (Layout) Popup window settings (e.g. `{'width': 0.9, 'height': 0.6}`) |
 
@@ -408,10 +444,10 @@ Tips
 
 ### fzf inside terminal buffer
 
-On the latest versions of Vim and Neovim, fzf will start in a terminal buffer.
+When fzf is configured to start in a terminal buffer inside Vim or Neovim, you
-If you find the default ANSI colors to be different, consider configuring the
+may find the default ANSI colors to be different. In that case, configure the
-colors using `g:terminal_ansi_colors` in regular Vim or `g:terminal_color_x`
+colors using `g:terminal_ansi_colors` in regular Vim or `g:terminal_color_x` in
-in Neovim.
+Neovim.
 
 ```vim
 " Terminal colors for seoul256 color scheme
@@ -442,7 +478,10 @@ else
 endif
 ```
 
-### Starting fzf in a popup window
+### Starting fzf in a Vim popup window
+
+You can configure fzf to start in a Vim popup window by setting the `window` key
+in `g:fzf_layout`.
 
 ```vim
 " Required:
@@ -458,16 +497,32 @@ endif
 let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
 ```
 
-Alternatively, you can make fzf open in a tmux popup window (requires tmux 3.2
+### Starting fzf in a tmux/Zellij popup window
-or above) by putting `--tmux` option value in `tmux` key.
+
+fzf can also start in a popup of the multiplexer instead of a window inside
+Vim, by putting a `--popup` option value in the `popup` key. `tmux` is
+accepted as a synonym, just as `--tmux` is an alias of `--popup`.
+
+The layout works on tmux 3.3 or above, or on Zellij 0.44 or above with fzf
+0.71.0 or above. It is the default on tmux 3.7 or above with fzf 0.74.0 or
+above, and on Zellij, where the pane is not modal: Vim keeps the window fzf
+was started from visible, and you can switch to it while fzf is open. Below
+those versions tmux gives a popup that cannot be left, so a window inside Vim
+is the default there. On tmux, an explicit `--border` style also gives a modal
+popup rather than a floating pane, because the native border of a tmux
+floating pane cannot be removed. Drop `--border` to keep the floating pane and
+its native border. Zellij keeps the floating pane either way, and hides its
+native border when fzf draws one. Set `g:fzf_layout` yourself to choose either
+one.
 
 ```vim
-" See `--tmux` option in `man fzf` for available options
+if exists('$TMUX') || exists('$ZELLIJ')
-" [center|top|bottom|left|right][,SIZE[%]][,SIZE[%]]
+  " See `--popup` option in `man fzf` for available options
-if exists('$TMUX')
+  " [center|top|bottom|left|right][,SIZE[%]][,SIZE[%]]
-  let g:fzf_layout = { 'tmux': '90%,70%' }
+  let g:fzf_layout = { 'popup': '90%,70%' }
 else
-  let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
+  " Configure the Vim popup window in case not on the multiplexer
+  let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.7 } }
 endif
 ```
 
@@ -475,7 +530,8 @@ endif
 
 When fzf starts in a terminal buffer, the file type of the buffer is set to
 `fzf`. So you can set up `FileType fzf` autocmd to customize the settings of
-the window.
+the window. This applies to the layouts that open inside Vim, not to the tmux
+or Zellij pane the default uses, which is not a buffer.
 
 For example, if you open fzf on the bottom on the screen (e.g. `{'down':
 '40%'}`), you might want to temporarily disable the statusline for a cleaner

doc/fzf.txt

@@ -14,7 +14,8 @@ FZF - TABLE OF CONTENTS                                            *fzf* *fzf-to
       Global options supported by fzf#wrap  |fzf-global-options-supported-by-fzf#wrap|
     Tips                                    |fzf-tips|
       fzf inside terminal buffer            |fzf-inside-terminal-buffer|
-      Starting fzf in a popup window        |fzf-starting-fzf-in-a-popup-window|
+      Starting fzf in a Vim popup window    |fzf-starting-fzf-in-a-vim-popup-window|
+      Starting fzf in a tmux/Zellij popup window  |fzf-starting-fzf-in-a-tmuxzellij-popup-window|
       Hide statusline                       |fzf-hide-statusline|
     License                                 |fzf-license|
 
@@ -161,19 +162,35 @@ Examples~
       \ 'ctrl-v': 'vsplit' }
 
     " Default fzf layout
-    " - Popup window (center of the screen)
+    if exists('$TMUX') || exists('$ZELLIJ')
-    let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
+      " The Vim plugin will try to open fzf in a tmux or Zellij popup
+      " if possible (requires recent fzf and tmux/zellij) using --popup option,
+      " with the following argument:
+      let g:fzf_layout = { 'popup': '90%,60%' }
+    else
+      " If --popup option is not available, it will open in a popup window inside
+      " Vim (center of the screen)
+      let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
+    endif
 
-    " - Popup window (center of the current window)
+    " Here are some more layout examples:
+
+    " - Tmux or Zellij popup at the bottom 40%
+    let g:fzf_layout = { 'popup': 'bottom,40%' }
+
+    " - Tmux or Zellij popup at the top with a different size
+    let g:fzf_layout = { 'popup': 'top,90%,40%' }
+
+    " - Vim popup window: at the center of the current window (relative)
     let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6, 'relative': v:true } }
 
-    " - Popup window (anchored to the bottom of the current window)
+    " - Vim popup window: anchored to the bottom of the current window
     let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6, 'relative': v:true, 'yoffset': 1.0 } }
 
-    " - down / up / left / right
+    " - Vim split window: down / up / left / right
     let g:fzf_layout = { 'down': '40%' }
 
-    " - Window using a Vim command
+    " - Vim window using a Vim command
     let g:fzf_layout = { 'window': 'enew' }
     let g:fzf_layout = { 'window': '-tabnew' }
     let g:fzf_layout = { 'window': '10new' }
@@ -310,7 +327,7 @@ The following table summarizes the available options.
   `options`                   | string/list   | Options to fzf
   `dir`                       | string        | Working directory
   `up` / `down` / `left` / `right`  | number/string | (Layout) Window position and size (e.g.  `20` ,  `50%` )
-  `tmux`                      | string        | (Layout) `--tmux` options (e.g.  `90%,70%` )
+  `popup` / `tmux`              | string        | (Layout) `--popup` options (e.g.  `90%,70%` )
   `window`  (Vim 8 / Neovim)  | string        | (Layout) Command to open fzf window (e.g.  `vertical aboveleft 30new` )
   `window`  (Vim 8 / Neovim)  | dict          | (Layout) Popup window settings (e.g.  `{'width': 0.9, 'height': 0.6}` )
  ---------------------------+---------------+----------------------------------------------------------------------
@@ -418,8 +435,8 @@ TIPS                                                                  *fzf-tips*
                                                     *fzf-inside-terminal-buffer*
 
 
-On the latest versions of Vim and Neovim, fzf will start in a terminal buffer.
+When fzf is configured to start in a terminal buffer inside Vim or Neovim, you
-If you find the default ANSI colors to be different, consider configuring the
+may find the default ANSI colors to be different. In that case, configure the
 colors using `g:terminal_ansi_colors` in regular Vim or `g:terminal_color_x`
 in Neovim.
 
@@ -452,8 +469,11 @@ in Neovim.
     endif
 <
 
-< Starting fzf in a popup window >____________________________________________~
+< Starting fzf in a Vim popup window >________________________________________~
-                                            *fzf-starting-fzf-in-a-popup-window*
+                                        *fzf-starting-fzf-in-a-vim-popup-window*
+
+You can configure fzf to start in a Vim popup window by setting the `window`
+key in `g:fzf_layout`.
 >
     " Required:
     " - width [float range [0 ~ 1]] or [integer range [8 ~ ]]
@@ -467,15 +487,33 @@ in Neovim.
     "   - 'rounded' / 'sharp' / 'horizontal' / 'vertical' / 'top' / 'bottom' / 'left' / 'right'
     let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
 <
-Alternatively, you can make fzf open in a tmux popup window (requires tmux 3.2
+
-or above) by putting `--tmux` options in `tmux` key.
+< Starting fzf in a tmux/Zellij popup window >________________________________~
+                                 *fzf-starting-fzf-in-a-tmuxzellij-popup-window*
+
+fzf can also start in a popup of the multiplexer instead of a window inside
+Vim, by putting a `--popup` option value in the `popup` key. `tmux` is
+accepted as a synonym, just as `--tmux` is an alias of `--popup`.
+
+The layout works on tmux 3.3 or above, or on Zellij 0.44 or above with fzf
+0.71.0 or above. It is the default on tmux 3.7 or above with fzf 0.74.0 or
+above, and on Zellij, where the pane is not modal: Vim keeps the window fzf
+was started from visible, and you can switch to it while fzf is open. Below
+those versions tmux gives a popup that cannot be left, so a window inside Vim
+is the default there. On tmux, an explicit `--border` style also gives a modal
+popup rather than a floating pane, because the native border of a tmux
+floating pane cannot be removed. Drop `--border` to keep the floating pane and
+its native border. Zellij keeps the floating pane either way, and hides its
+native border when fzf draws one. Set `g:fzf_layout` yourself to choose either
+one.
 >
-    " See `--tmux` option in `man fzf` for available options
+    if exists('$TMUX') || exists('$ZELLIJ')
-    " [center|top|bottom|left|right][,SIZE[%]][,SIZE[%]]
+      " See `--popup` option in `man fzf` for available options
-    if exists('$TMUX')
+      " [center|top|bottom|left|right][,SIZE[%]][,SIZE[%]]
-      let g:fzf_layout = { 'tmux': '90%,70%' }
+      let g:fzf_layout = { 'popup': '90%,70%' }
     else
-      let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
+      " Configure the Vim popup window in case not on the multiplexer
+      let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.7 } }
     endif
 <
 
@@ -484,7 +522,8 @@ or above) by putting `--tmux` options in `tmux` key.
 
 When fzf starts in a terminal buffer, the file type of the buffer is set to
 `fzf`. So you can set up `FileType fzf` autocmd to customize the settings of
-the window.
+the window. This applies to the layouts that open inside Vim, not to the tmux
+or Zellij pane the default uses, which is not a buffer.
 
 For example, if you open fzf on the bottom on the screen (e.g. `{'down':
 '40%'}`), you might want to temporarily disable the statusline for a cleaner

plugin/fzf.vim

@@ -24,7 +24,8 @@
 if exists('g:loaded_fzf')
   finish
 endif
-let g:loaded_fzf = 1
+" Bumped when the plugin gains behavior a caller may need to detect
+let g:loaded_fzf = 20260821
 
 let s:is_win = has('win32') || has('win64')
 if s:is_win && &shellslash
@@ -127,7 +128,7 @@ function! s:fzf_tempname()
   return s:fzf_call('tempname')
 endfunction
 
-let s:layout_keys = ['window', 'tmux', 'up', 'down', 'left', 'right']
+let s:layout_keys = ['window', 'popup', 'tmux', 'up', 'down', 'left', 'right']
 let s:fzf_go = s:base_dir.'/bin/fzf'
 let s:fzf_tmux = s:base_dir.'/bin/fzf-tmux'
 
@@ -139,6 +140,11 @@ function! s:popup_support()
 endfunction
 
 function! s:default_layout()
+  " A floating pane leaves the window fzf was started from visible and
+  " reachable while fzf is open. A popup covers it, inside Vim or not
+  if s:floating_pane()
+    return { 'tmux': '90%,60%' }
+  endif
   return s:popup_support()
         \ ? { 'window' : { 'width': 0.9, 'height': 0.6 } }
         \ : { 'down': '~40%' }
@@ -164,6 +170,12 @@ function! fzf#install()
   if v:shell_error
     throw 'Failed to download fzf: '.script
   endif
+
+  " A new binary invalidates the chosen executable and everything derived from
+  " its version, including whether fzf opens a floating pane. fzf#install() is
+  " also the vim-plug 'do' hook, so this can run long after the first fzf call
+  let [s:versions, s:checked] = [{}, {}]
+  unlet! s:exec s:tmux s:tmux_floating
 endfunction
 
 let s:versions = {}
@@ -255,8 +267,24 @@ function! fzf#exec(...)
   return s:exec
 endfunction
 
+" Path to the fzf-tmux script, or an empty string if it is not available. Only
+" the legacy options still need it. --popup is handled by fzf itself.
+function! s:fzf_tmux_script()
+  if !executable(s:fzf_tmux)
+    if !executable('fzf-tmux')
+      return ''
+    endif
+    let s:fzf_tmux = 'fzf-tmux'
+  endif
+  return s:fzf_tmux
+endfunction
+
 function! s:tmux_enabled()
-  if has('gui_running') || !exists('$TMUX')
+  if has('gui_running')
+    return 0
+  endif
+
+  if empty($TMUX) && empty($ZELLIJ)
     return 0
   endif
 
@@ -264,17 +292,42 @@ function! s:tmux_enabled()
     return s:tmux
   endif
 
-  let s:tmux = 0
+  let [s:tmux, s:tmux_floating] = [0, 0]
-  if !executable(s:fzf_tmux)
+
-    if executable('fzf-tmux')
+  " --popup covers Zellij as well, where the fzf-tmux script and the tmux
-      let s:fzf_tmux = 'fzf-tmux'
+  " version are irrelevant. fzf learned it in 0.71.0, and the floating pane
-    else
+  " options it passes need Zellij 0.44 or above. fzf checks tmux first, so
-      return 0
+  " this branch is Zellij without tmux. Both non-empty means tmux wins.
-    endif
+  " empty(), not exists(), to match how fzf reads the two variables
+  if empty($TMUX)
+    let s:tmux =
+          \ s:compare_versions(s:get_version(s:fzf_binary()), '0.71.0') >= 0
+          \ && s:compare_versions(s:zellij_version(), '0.44') >= 0
+    let s:tmux_floating = s:tmux
+    return s:tmux
   endif
 
   let output = system('tmux -V')
-  let s:tmux = !v:shell_error && output >= 'tmux 1.7'
+  if v:shell_error
+    return s:tmux
+  endif
+  " e.g. 'tmux 3.7b', 'tmux next-3.8'
+  let ver = matchstr(output, '\d\+\.\d\+')
+
+  " --popup requires tmux 3.3 or above, and needs no fzf-tmux script. The
+  " default layout wants a floating pane, which needs tmux 3.7 or above, fzf
+  " 0.74.0 or above, and a pane to start from. fzf opens a modal popup when
+  " any of the three is missing
+  if s:compare_versions(ver, '3.3') >= 0
+    let s:tmux = 1
+    let s:tmux_floating = s:compare_versions(ver, '3.7') >= 0
+          \ && !empty($TMUX_PANE)
+          \ && s:compare_versions(s:get_version(s:fzf_binary()), '0.74.0') >= 0
+    return s:tmux
+  endif
+
+  " Older versions still go through the script
+  let s:tmux = !empty(s:fzf_tmux_script()) && s:compare_versions(ver, '1.7') >= 0
   return s:tmux
 endfunction
 
@@ -422,7 +475,10 @@ function! fzf#wrap(...)
     if !exists('g:fzf_layout') && exists('g:fzf_height')
       let opts.down = g:fzf_height
     else
-      let opts = extend(opts, s:validate_layout(get(g:, 'fzf_layout', s:default_layout())))
+      " Not get(), which would evaluate s:default_layout() and run its version
+      " checks even when g:fzf_layout makes the answer irrelevant
+      let opts = extend(opts, s:validate_layout(
+            \ exists('g:fzf_layout') ? g:fzf_layout : s:default_layout()))
     endif
   endif
 
@@ -502,6 +558,11 @@ try
   let [shell, shellslash, shellcmdflag, shellxquote] = s:use_sh()
 
   let dict   = exists('a:1') ? copy(a:1) : {}
+  " 'popup' and 'tmux' are synonyms, as --popup and --tmux are. Normalize here
+  " so that the rest of the function only has to know about one of them.
+  if has_key(dict, 'popup')
+    let dict.tmux = remove(dict, 'popup')
+  endif
   let temps  = { 'result': s:fzf_tempname() }
   let optstr = s:evaluate_opts(get(dict, 'options', ''))
   try
@@ -539,16 +600,19 @@ try
         \ executable('tput') && filereadable('/dev/tty')
   let has_vim8_term = has('terminal') && has('patch-8.0.995')
   let has_nvim_term = has('nvim-0.2.1') || has('nvim') && !s:is_win
-  let use_term = has_nvim_term || has_vim8_term
+  let use_term = (has_nvim_term || has_vim8_term) && !s:need_cmd_window
-    \ && !s:need_cmd_window
-    \ && (has('gui_running') || s:is_win || s:present(dict, 'down', 'up', 'left', 'right', 'window'))
   let use_tmux = (has_key(dict, 'tmux') || (!use_height && !use_term || prefer_tmux) && !has('win32unix') && s:splittable(dict)) && s:tmux_enabled()
   if prefer_tmux && use_tmux
     let use_height = 0
     let use_term = 0
   endif
   if use_term
-    let optstr .= ' --no-height --no-tmux'
+    let optstr .= ' --no-height'
+    " Cancel a --popup from $FZF_DEFAULT_OPTS only when the spec asks for a Vim
+    " window. Without a layout option, respect the user's preference.
+    if s:present(dict, 'window', 'up', 'down', 'left', 'right')
+      let optstr .= ' --no-tmux'
+    endif
   elseif use_height
     let height = s:calc_size(&lines, dict.down, dict)
     let optstr .= ' --no-tmux --height='.height
@@ -568,8 +632,12 @@ try
     return s:execute_term(dict, command, temps)
   endif
 
-  let lines = use_tmux ? s:execute_tmux(dict, command, temps)
+  " s:execute_tmux may run fzf asynchronously, so it calls s:callback itself
-                 \ : s:execute(dict, command, use_height, temps)
+  if use_tmux
+    return s:execute_tmux(dict, command, temps)
+  endif
+
+  let lines = s:execute(dict, command, use_height, temps)
   call s:callback(dict, lines)
   return lines
 finally
@@ -586,6 +654,38 @@ function! s:present(dict, ...)
   return 0
 endfunction
 
+" The binary fzf#exec() would choose, without its prompting or installing.
+" Layout selection runs before fzf#exec() has resolved one
+function! s:fzf_binary()
+  if exists('s:exec')
+    return s:exec
+  endif
+  let bins = filter(['fzf', s:fzf_go], 'executable(v:val)')
+  if empty(bins)
+    return ''
+  endif
+  return len(bins) > 1 ? sort(bins, 's:compare_binary_versions')[-1] : bins[0]
+endfunction
+
+function! s:zellij_version()
+  if !exists('s:zellij_ver')
+    let output = systemlist('zellij --version')
+    let s:zellij_ver = v:shell_error || empty(output)
+          \ ? '' : matchstr(output[0], '[0-9.]\+')
+  endif
+  return s:zellij_ver
+endfunction
+
+" Whether fzf will open a floating pane that can be left while fzf runs. A
+" tmux popup below 3.7 is modal, and the fzf-tmux script that older tmux
+" versions need does not accept a --popup value at all. Without a job to wait
+" on fzf, s:execute_tmux() blocks on system() and the window stays visible but
+" frozen, so the default keeps fzf inside Vim there
+function! s:floating_pane()
+  return (has('nvim') || has('job'))
+        \ && s:tmux_enabled() && get(s:, 'tmux_floating', 0)
+endfunction
+
 function! s:fzf_tmux(dict)
   let size = get(a:dict, 'tmux', '')
   if empty(size)
@@ -597,10 +697,15 @@ function! s:fzf_tmux(dict)
     endfor
   endif
 
-  " Legacy fzf-tmux options
+  " Legacy fzf-tmux options are flags. A --tmux value never starts with a dash,
-  if size =~ '-'
+  " but may contain one, as in '90%,60%,border-native'
+  if size =~ '^-'
+    let script = s:fzf_tmux_script()
+    if empty(script)
+      throw 'fzf-tmux not found, required for the legacy option: ' . size
+    endif
     return printf('LINES=%d COLUMNS=%d %s %s %s --',
-          \ &lines, &columns, fzf#shellescape(s:fzf_tmux), size, (has_key(a:dict, 'source') ? '' : '-'))
+          \ &lines, &columns, fzf#shellescape(script), size, (has_key(a:dict, 'source') ? '' : '-'))
   end
 
   " Using native --tmux option
@@ -742,6 +847,42 @@ function! s:execute(dict, command, use_height, temps) abort
   return s:exit_handler(a:dict, exit_status, command) < 2 ? lines : []
 endfunction
 
+" Returns 0 if the job could not be started
+function! s:start_popup_job(dict, command, temps) abort
+  let fzf = { 'dict': a:dict, 'temps': a:temps, 'command': a:command }
+  " Vim passes (job, status) and Nvim (id, status, event)
+  function! fzf.on_exit(id, code, ...) abort
+    redraw!
+    let lines = s:collect(self.temps)
+    if s:exit_handler(self.dict, a:code, self.command, 1) >= 2
+      return
+    endif
+    call s:pushd(self.dict)
+    call s:callback(self.dict, lines)
+  endfunction
+
+  if has('nvim')
+    return jobstart([&shell, &shellcmdflag, a:command], fzf) > 0
+  endif
+
+  " The command redirects to the result file, so no stream is of interest
+  let opts = { 'exit_cb': function(fzf.on_exit),
+        \ 'in_io': 'null', 'out_io': 'null', 'err_io': 'null' }
+
+  " job_start() gives the child $TERM=dumb, and the popup inherits the
+  " environment from here, so fzf would lose its colors. 'env' was added in
+  " 8.0.902, so set it in the command itself on older versions.
+  let command = a:command
+  if has('patch-8.0.902')
+    let opts.env = { 'TERM': $TERM }
+  elseif !s:is_win
+    let command = join(['export TERM=' . fzf#shellescape($TERM) . ';', command])
+  endif
+
+  let job = job_start([&shell, &shellcmdflag, command], opts)
+  return job_status(job) !=# 'fail'
+endfunction
+
 function! s:execute_tmux(dict, command, temps) abort
   let command = a:command
   let cwd = s:pushd(a:dict)
@@ -750,11 +891,24 @@ function! s:execute_tmux(dict, command, temps) abort
     let command = join(['cd', fzf#shellescape(cwd), '&&', command])
   endif
 
+  " fzf draws in a pane of its own, so the process we start here only waits for
+  " it. Hold it with a job instead of system() so that Vim keeps processing its
+  " event loop, and nothing has to be displayed for it. Fall back to the
+  " blocking path when the job cannot be started, or the sink would never run
+  " and the temporary files would be left behind.
+  if (has('nvim') || has('job')) && s:start_popup_job(a:dict, command, a:temps)
+    " Restore the working directory while fzf runs. on_exit pushes it again
+    call s:dopopd()
+    return []
+  endif
+
   call system(command)
   let exit_status = v:shell_error
   redraw!
   let lines = s:collect(a:temps)
-  return s:exit_handler(a:dict, exit_status, command) < 2 ? lines : []
+  let lines = s:exit_handler(a:dict, exit_status, command) < 2 ? lines : []
+  call s:callback(a:dict, lines)
+  return lines
 endfunction
 
 function! s:calc_size(max, val, dict)

src/result.go

@@ -82,10 +82,10 @@ func buildResultFromBounds(item *Item, score int, minBegin, minEnd, maxEnd int,
 			val = item.TrimLength()
 		case byPathname:
 			if validOffsetFound {
+				// Rune index, to be comparable with minBegin
 				lastDelim := -1
-				s := item.text.ToString()
+				for i := numChars - 1; i >= 0; i-- {
-				for i := len(s) - 1; i >= 0; i-- {
+					if r := item.text.Get(i); r == '/' || r == '\\' {
-					if s[i] == '/' || s[i] == '\\' {
 						lastDelim = i
 						break
 					}

src/result_test.go

@@ -272,3 +272,28 @@ func TestRadixSortResults(t *testing.T) {
 		}
 	}
 }
+
+func TestPathnameTiebreak(t *testing.T) {
+	// FIXME global
+	sortCriteria = []criterion{byScore, byPathname}
+
+	score := 100
+	test := func(input string, offset Offset, expected uint16) {
+		for _, chars := range []util.Chars{util.ToChars([]byte(input)), util.RunesToChars([]rune(input))} {
+			item := buildResult(withIndex(&Item{text: chars}, 1), []Offset{offset}, score)
+			if item.points[3] != math.MaxUint16-uint16(score) || item.points[2] != expected {
+				t.Error(input, item.points, expected)
+			}
+		}
+	}
+
+	// Match in the file name
+	test("x/foo/foo.txt", Offset{6, 9}, 1)
+	// Match in the directory path
+	test("x/foo/aa.txt", Offset{2, 5}, math.MaxUint16)
+
+	// Offsets are rune indexes, so a multi-byte character before the last
+	// delimiter must not shift the delimiter position
+	test("一x/foo/foo.txt", Offset{7, 10}, 1)
+	test("一x/foo/aa.txt", Offset{3, 6}, math.MaxUint16)
+}

src/terminal_test.go

@@ -29,6 +29,9 @@ func replacePlaceholderTest(template string, stripAnsi bool, delimiter Delimiter
 }
 
 func TestReplacePlaceholder(t *testing.T) {
+	// Pin $SHELL so the quoting style doesn't depend on the test runner's shell
+	t.Setenv("SHELL", "cmd")
+
 	item1 := newItem("  foo'bar \x1b[31mbaz\x1b[m")
 	items1 := [3][]*Item{{item1}, {item1}, nil}
 	items2 := [3][]*Item{
@@ -255,6 +258,9 @@ func TestQuoteEntry(t *testing.T) {
 	unixStyle := quotes{``, `'`, `'\''`, `"`, `\`, `\`}
 	windowsStyle := quotes{`^`, `^"`, `'`, `\^"`, `\\`, `\`}
 	var effectiveStyle quotes
+
+	// Pin $SHELL so the quoting style doesn't depend on the test runner's shell
+	t.Setenv("SHELL", "cmd")
 	exec := util.NewExecutor("")
 
 	if util.IsWindows() {

src/tui/light.go

@@ -26,6 +26,7 @@ const (
 	offsetPollTries = 10
 	queryTimeout    = 500 * time.Millisecond
 	maxInputBuffer  = 1024 * 1024
+	escapeLookback  = 256
 	maxSelectTries  = 100
 )
 
@@ -338,6 +339,45 @@ func getEnv(name string, defaultValue int) int {
 	return atoi(env, defaultValue)
 }
 
+// Bytes of a CSI sequence: parameter and intermediate bytes continue it, a
+// final byte ends it. Order is not enforced. Strictness would only make fzf
+// give up on a sequence it could have framed.
+//
+// https://vt100.net/emu/dec_ansi_parser
+func csiContinues(b byte) bool { return b >= 0x20 && b <= 0x3f }
+func csiFinal(b byte) bool     { return b >= 0x40 && b <= 0x7e }
+
+// incompleteEscape reports whether the buffer ends in an escape sequence that
+// has not been terminated yet. The read loop keeps waiting in that case, so the
+// parser is never handed a fragment to guess at.
+func incompleteEscape(buffer []byte) bool {
+	// Only the tail can hold a sequence still arriving. This runs once per byte
+	// read, so scanning all of a large paste would make the read quadratic.
+	tail := buffer
+	if len(tail) > escapeLookback {
+		tail = tail[len(tail)-escapeLookback:]
+	}
+	start := bytes.LastIndexByte(tail, Esc.Byte())
+	if start < 0 || len(tail)-start < 2 {
+		return false
+	}
+	switch tail[start+1] {
+	case '[':
+		for _, b := range tail[start+2:] {
+			if csiFinal(b) {
+				return false
+			}
+			if !csiContinues(b) {
+				return false // malformed, do not wait for a terminator
+			}
+		}
+		return true
+	case 'O':
+		return len(tail)-start < 3
+	}
+	return false
+}
+
 func (r *LightRenderer) getBytes(cancellable bool) ([]byte, getCharResult, error) {
 	return r.getBytesInternal(cancellable, r.buffer, false)
 }
@@ -378,6 +418,13 @@ func (r *LightRenderer) getBytesInternal(cancellable bool, buffer []byte, nonblo
 			retries = 0
 		}
 		buffer = append(buffer, byte(c))
+		// Keep waiting while a sequence is still arriving. Dropping the budget
+		// after every byte left fzf parsing whatever the read happened to end on.
+		// Past the introducer this is not the ESC key, so the wait costs no
+		// Escape latency and ESCDELAY=0 must not reduce it to nothing.
+		if retries == 0 && incompleteEscape(buffer) {
+			retries = max(r.escDelay, defaultEscDelay) / escPollInterval
+		}
 		pc = c
 
 		// This should never happen under normal conditions,

src/tui/light_escape_test.go

@@ -0,0 +1,53 @@
+package tui
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestIncompleteEscape(t *testing.T) {
+	for _, c := range []struct {
+		buffer string
+		want   bool
+	}{
+		// Complete sequences: nothing to wait for
+		{"\x1b[A", false},
+		{"\x1bOA", false},
+		{"\x1b[1;5A", false},
+		{"\x1b[200~", false},
+		{"\x1b[<0;1;1M", false},
+		{"\x1b[12;34R", false},
+		{"\x1b[?2004;2$y", false},
+		{"\x1b[?1;2c", false},
+
+		// Fragments: keep waiting
+		{"\x1b[", true},
+		{"\x1b[?", true},
+		{"\x1b[1;", true},
+		{"\x1b[?2004;2$", true},
+		{"\x1bO", true},
+		{"\x1b[<0;1;", true},
+
+		// Only the trailing sequence matters
+		{"ab\x1b[?2004;2$", true},
+		{"\x1b[A\x1b[", true},
+		{"\x1b[A\x1b[B", false},
+
+		// Long buffers: only the tail is scanned, so an introducer further
+		// back than escapeLookback is not waited for
+		{strings.Repeat("a", 100000), false},
+		{"\x1b[" + strings.Repeat("a", 100000), false},
+		{strings.Repeat("a", 100000) + "\x1b[1;", true},
+
+		// Not a sequence fzf waits on
+		{"", false},
+		{"abc", false},
+		{"\x1b", false},      // lone ESC, handled by the existing escDelay branch
+		{"\x1ba", false},     // ALT-a
+		{"\x1b[\x01", false}, // malformed, do not stall on it
+	} {
+		if got := incompleteEscape([]byte(c.buffer)); got != c.want {
+			t.Errorf("incompleteEscape(%q) = %v, want %v", c.buffer, got, c.want)
+		}
+	}
+}

test/vim/fzf.vader

@@ -4,15 +4,44 @@ Execute (Setup):
   Log 'Test directory: ' . g:dir
   Save &acd
 
+  " fzf#run runs fzf in a terminal buffer and returns immediately, so the
+  " assertions have to wait for the run to finish. 'exit' is called from the
+  " same handler that runs the sink, just before it, so once it has fired the
+  " sink has run too. It also fires when nothing is selected, unlike the sink.
+  function! g:FzfExit(code)
+    let g:fzf_done = 1
+  endfunction
+
+  " Collects the output without displacing a 'sink' the spec already has.
+  " s:callback runs both
+  function! g:FzfCollect(lines)
+    call extend(g:fzf_lines, a:lines)
+  endfunction
+
+  function! g:FzfRun(spec) abort
+    let g:fzf_done = 0
+    let g:fzf_lines = []
+    call fzf#run(extend(copy(a:spec),
+    \ { 'exit': function('g:FzfExit'), 'sinklist': function('g:FzfCollect') }))
+    let started = reltime()
+    while !g:fzf_done && reltimefloat(reltime(started)) < 10
+      sleep 10m
+    endwhile
+    if !g:fzf_done
+      throw 'Timed out waiting for fzf#run'
+    endif
+    return g:fzf_lines
+  endfunction
+
 Execute (fzf#run with dir option):
   let cwd = getcwd()
-  let result = fzf#run({ 'source': 'git ls-files', 'options': '--filter=vdr', 'dir': g:dir })
+  let result = g:FzfRun({ 'source': 'git ls-files', 'options': '--filter=vdr', 'dir': g:dir })
   AssertEqual ['fzf.vader'], result
   AssertEqual 0, haslocaldir()
   AssertEqual getcwd(), cwd
 
   execute 'lcd' fnameescape(cwd)
-  let result = sort(fzf#run({ 'source': 'git ls-files', 'options': '--filter e', 'dir': g:dir }))
+  let result = sort(g:FzfRun({ 'source': 'git ls-files', 'options': '--filter e', 'dir': g:dir }))
   AssertEqual ['fzf.vader'], result
   AssertEqual 1, haslocaldir()
   AssertEqual getcwd(), cwd
@@ -22,32 +51,32 @@ Execute (fzf#run with Funcref command):
   function! g:FzfTest(e)
     call add(g:ret, a:e)
   endfunction
-  let result = sort(fzf#run({ 'source': 'git ls-files', 'sink': function('g:FzfTest'), 'options': '--filter e', 'dir': g:dir }))
+  let result = sort(g:FzfRun({ 'source': 'git ls-files', 'sink': function('g:FzfTest'), 'options': '--filter e', 'dir': g:dir }))
   AssertEqual ['fzf.vader'], result
   AssertEqual ['fzf.vader'], sort(g:ret)
 
 Execute (fzf#run with string source):
-  let result = sort(fzf#run({ 'source': 'echo hi', 'options': '-f i' }))
+  let result = sort(g:FzfRun({ 'source': 'echo hi', 'options': '-f i' }))
   AssertEqual ['hi'], result
 
 Execute (fzf#run with list source):
-  let result = sort(fzf#run({ 'source': ['hello', 'world'], 'options': '-f e' }))
+  let result = sort(g:FzfRun({ 'source': ['hello', 'world'], 'options': '-f e' }))
   AssertEqual ['hello'], result
-  let result = sort(fzf#run({ 'source': ['hello', 'world'], 'options': '-f o' }))
+  let result = sort(g:FzfRun({ 'source': ['hello', 'world'], 'options': '-f o' }))
   AssertEqual ['hello', 'world'], result
 
 Execute (fzf#run with string source):
-  let result = sort(fzf#run({ 'source': 'echo hi', 'options': '-f i' }))
+  let result = sort(g:FzfRun({ 'source': 'echo hi', 'options': '-f i' }))
   AssertEqual ['hi'], result
 
 Execute (fzf#run with dir option and noautochdir):
   set noacd
   let cwd = getcwd()
-  call fzf#run({'source': ['/foobar'], 'sink': 'e', 'dir': '/tmp', 'options': '-1'})
+  call g:FzfRun({'source': ['/foobar'], 'sink': 'e', 'dir': '/tmp', 'options': '-1'})
   " No change in working directory
   AssertEqual cwd, getcwd()
 
-  call fzf#run({'source': ['/foobar'], 'sink': 'tabe', 'dir': '/tmp', 'options': '-1'})
+  call g:FzfRun({'source': ['/foobar'], 'sink': 'tabe', 'dir': '/tmp', 'options': '-1'})
   AssertEqual cwd, getcwd()
   tabclose
   AssertEqual cwd, getcwd()
@@ -55,13 +84,13 @@ Execute (fzf#run with dir option and noautochdir):
 Execute (Incomplete fzf#run with dir option and autochdir):
   set acd
   let cwd = getcwd()
-  call fzf#run({'source': [], 'sink': 'e', 'dir': '/tmp', 'options': '-0'})
+  call g:FzfRun({'source': [], 'sink': 'e', 'dir': '/tmp', 'options': '-0'})
   " No change in working directory even if &acd is set
   AssertEqual cwd, getcwd()
 
 Execute (FIXME: fzf#run with dir option and autochdir):
   set acd
-  call fzf#run({'source': ['/foobar'], 'sink': 'e', 'dir': '/tmp', 'options': '-1'})
+  call g:FzfRun({'source': ['/foobar'], 'sink': 'e', 'dir': '/tmp', 'options': '-1'})
   " Working directory changed due to &acd
   AssertEqual '/foobar', expand('%')
   AssertEqual '/', getcwd()
@@ -69,13 +98,40 @@ Execute (FIXME: fzf#run with dir option and autochdir):
 Execute (fzf#run with dir option and autochdir when final cwd is same as dir):
   set acd
   cd /tmp
-  call fzf#run({'source': ['/foobar'], 'sink': 'e', 'dir': '/', 'options': '-1'})
+  call g:FzfRun({'source': ['/foobar'], 'sink': 'e', 'dir': '/', 'options': '-1'})
   " Working directory changed due to &acd
   AssertEqual '/', getcwd()
 
+Execute (Default layout):
+  unlet! g:fzf_layout g:fzf_height
+  let layout_keys = ['window', 'popup', 'tmux', 'up', 'down', 'left', 'right']
+
+  let opts = fzf#wrap('foobar')
+  Log opts
+  let found = filter(copy(layout_keys), 'has_key(opts, v:val)')
+  AssertEqual 1, len(found)
+  if found[0] ==# 'tmux'
+    " Only where fzf opens a floating pane, which can be left while fzf runs
+    Assert !empty($TMUX) || !empty($ZELLIJ)
+    AssertEqual '90%,60%', opts.tmux
+  elseif found[0] ==# 'window'
+    AssertEqual 0.9, opts.window.width
+  else
+    " No popup support in this build
+    AssertEqual '~40%', opts.down
+  endif
+
+  " Fullscreen strips it, whichever it was
+  let opts = fzf#wrap('foobar', {}, 1)
+  Log opts
+  AssertEqual [], filter(copy(layout_keys), 'has_key(opts, v:val)')
+
 Execute (fzf#wrap):
   AssertThrows fzf#wrap({'foo': 'bar'})
 
+  " Pin the layout so the assertions do not depend on the environment
+  let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
+
   let opts = fzf#wrap('foobar')
   Log opts
   AssertEqual 0.9, opts.window.width
@@ -150,6 +206,30 @@ Execute (fzf#wrap):
   let opts = fzf#wrap({})
   Assert opts.options =~ '--color=fg:'
 
+Execute (popup is a synonym of tmux):
+  unlet! g:fzf_layout
+
+  " Treated as a layout option, so g:fzf_layout is not applied on top
+  let opts = fzf#wrap('foobar', {'popup': '90%,70%'})
+  AssertEqual '90%,70%', opts.popup
+  Assert !has_key(opts, 'window')
+
+  " And stripped in fullscreen, like the others
+  let opts = fzf#wrap('foobar', {'popup': '90%,70%'}, 1)
+  Assert !has_key(opts, 'popup')
+
+  " Accepted in g:fzf_layout
+  let g:fzf_layout = {'popup': '90%,70%'}
+  let opts = fzf#wrap('foobar')
+  AssertEqual '90%,70%', opts.popup
+  unlet g:fzf_layout
+
+  " Listed as a valid key
+  let g:fzf_layout = {'bogus': 1}
+  AssertThrows call fzf#wrap('foobar')
+  Assert g:vader_exception =~ 'popup'
+  unlet g:fzf_layout
+
 Execute (fzf#shellescape with sh):
   AssertEqual '''''', fzf#shellescape('', 'sh')
   AssertEqual '''\''', fzf#shellescape('\', 'sh')