Merge pull request #12531 from BK1603/autoread-tui

Autoread now works in TUI too. The checktimestamp test is run at most once every 2 seconds not to poll too much and also because it doesn't make sense on some filesystems. A solution based on filesystem notifications should arrive soon.

3 files changed, 142 insertions, 17 deletions

diff --git a/runtime/autoload/health/nvim.vim b/runtime/autoload/health/nvim.vim
index c25f5ee64f..f18801ea69 100644
--- a/runtime/autoload/health/nvim.vim
+++ b/runtime/autoload/health/nvim.vim
@@ -129,6 +129,25 @@ function! s:check_performance() abort
   endif
 endfunction
 
+function! s:get_tmux_option(option) abort
+  let cmd = 'tmux show-option -qvg '.a:option  " try global scope
+  let out = system(cmd)
+  let val = substitute(out, '\v(\s|\r|\n)', '', 'g')
+  if v:shell_error
+    call health#report_error('command failed: '.cmd."\n".out)
+    return 'error'
+  elseif empty(val)
+    let cmd = 'tmux show-option -qvgs '.a:option  " try session scope
+    let out = system(cmd)
+    let val = substitute(out, '\v(\s|\r|\n)', '', 'g')
+    if v:shell_error
+      call health#report_error('command failed: '.cmd."\n".out)
+      return 'error'
+    endif
+  endif
+  return val
+endfunction
+
 function! s:check_tmux() abort
   if empty($TMUX) || !executable('tmux')
     return
@@ -136,20 +155,31 @@ function! s:check_tmux() abort
   call health#report_start('tmux')
 
   " check escape-time
-  let suggestions = ["Set escape-time in ~/.tmux.conf:\nset-option -sg escape-time 10",
+  let suggestions = ["set escape-time in ~/.tmux.conf:\nset-option -sg escape-time 10",
         \ s:suggest_faq]
-  let cmd = 'tmux show-option -qvgs escape-time'
-  let out = system(cmd)
-  let tmux_esc_time = substitute(out, '\v(\s|\r|\n)', '', 'g')
-  if v:shell_error
-    call health#report_error('command failed: '.cmd."\n".out)
-  elseif empty(tmux_esc_time)
-    call health#report_error('escape-time is not set', suggestions)
-  elseif tmux_esc_time > 300
-    call health#report_error(
-        \ 'escape-time ('.tmux_esc_time.') is higher than 300ms', suggestions)
-  else
-    call health#report_ok('escape-time: '.tmux_esc_time.'ms')
+  let tmux_esc_time = s:get_tmux_option('escape-time')
+  if tmux_esc_time !=# 'error'
+    if empty(tmux_esc_time)
+      call health#report_error('`escape-time` is not set', suggestions)
+    elseif tmux_esc_time > 300
+      call health#report_error(
+          \ '`escape-time` ('.tmux_esc_time.') is higher than 300ms', suggestions)
+    else
+      call health#report_ok('escape-time: '.tmux_esc_time)
+    endif
+  endif
+
+  " check focus-events
+  let suggestions = ["(tmux 1.9+ only) Set `focus-events` in ~/.tmux.conf:\nset-option -g focus-events on"]
+  let tmux_focus_events = s:get_tmux_option('focus-events')
+  call health#report_info('Checking stuff')
+  if tmux_focus_events !=# 'error'
+    if empty(tmux_focus_events) || tmux_focus_events !=# 'on'
+      call health#report_warn(
+          \ "`focus-events` is not enabled. |'autoread'| may not work.", suggestions)
+    else
+      call health#report_ok('focus-events: '.tmux_focus_events)
+    endif
   endif
 
   " check default-terminal and $TERM
@@ -203,9 +233,9 @@ function! s:check_terminal() abort
     call health#report_error('command failed: '.cmd."\n".out)
   else
     call health#report_info('key_backspace (kbs) terminfo entry: '
-        \ .(empty(kbs_entry) ? '? (not found)' : kbs_entry))
+          \ .(empty(kbs_entry) ? '? (not found)' : kbs_entry))
     call health#report_info('key_dc (kdch1) terminfo entry: '
-        \ .(empty(kbs_entry) ? '? (not found)' : kdch1_entry))
+          \ .(empty(kbs_entry) ? '? (not found)' : kdch1_entry))
   endif
   for env_var in ['XTERM_VERSION', 'VTE_VERSION', 'TERM_PROGRAM', 'COLORTERM', 'SSH_TTY']
     if exists('$'.env_var)
diff --git a/src/nvim/aucmd.c b/src/nvim/aucmd.c
index a9a7d834a4..32c77fa288 100644
--- a/src/nvim/aucmd.c
+++ b/src/nvim/aucmd.c
@@ -8,6 +8,8 @@
 #include "nvim/ui.h"
 #include "nvim/aucmd.h"
 #include "nvim/eval.h"
+#include "nvim/ex_getln.h"
+#include "nvim/buffer.h"
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "aucmd.c.generated.h"
@@ -50,12 +52,47 @@ void aucmd_schedule_focusgained(bool gained)
 static void do_autocmd_focusgained(bool gained)
 {
   static bool recursive = false;
+  static Timestamp last_time = (time_t)0;
+  bool need_redraw = false;
 
   if (recursive) {
     return;  // disallow recursion
   }
   recursive = true;
-  apply_autocmds((gained ? EVENT_FOCUSGAINED : EVENT_FOCUSLOST),
-                 NULL, NULL, false, curbuf);
+  need_redraw |= apply_autocmds((gained ? EVENT_FOCUSGAINED : EVENT_FOCUSLOST),
+                                NULL, NULL, false, curbuf);
+
+  // When activated: Check if any file was modified outside of Vim.
+  // Only do this when not done within the last two seconds as:
+  // 1. Some filesystems have modification time granularity in seconds. Fat32
+  //    has a granularity of 2 seconds.
+  // 2. We could get multiple notifications in a row.
+  if (gained && last_time + (Timestamp)2000 < os_now()) {
+    need_redraw = check_timestamps(true);
+    last_time = os_now();
+  }
+
+  if (need_redraw) {
+    // Something was executed, make sure the cursor is put back where it
+    // belongs.
+    need_wait_return = false;
+
+    if (State & CMDLINE) {
+      redrawcmdline();
+    } else if ((State & NORMAL) || (State & INSERT)) {
+      if (must_redraw != 0) {
+        update_screen(0);
+      }
+
+      setcursor();
+    }
+
+    ui_flush();
+  }
+
+  if (need_maketitle) {
+    maketitle();
+  }
+
   recursive = false;
 }
diff --git a/test/functional/autoread/focus_spec.lua b/test/functional/autoread/focus_spec.lua
new file mode 100644
index 0000000000..1d52e9948f
--- /dev/null
+++ b/test/functional/autoread/focus_spec.lua
@@ -0,0 +1,58 @@
+local helpers = require('test.functional.helpers')(after_each)
+local thelpers = require('test.functional.terminal.helpers')
+local lfs = require('lfs')
+local clear = helpers.clear
+local nvim_prog = helpers.nvim_prog
+local feed_command = helpers.feed_command
+local feed_data = thelpers.feed_data
+
+if helpers.pending_win32(pending) then return end
+
+describe('autoread TUI FocusGained/FocusLost', function()
+  local screen
+
+  before_each(function()
+    clear()
+    screen = thelpers.screen_setup(0, '["'..nvim_prog
+      ..'", "-u", "NONE", "-i", "NONE", "--cmd", "set noswapfile noshowcmd noruler"]')
+  end)
+
+  it('external file change', function()
+    local path = 'xtest-foo'
+    local expected_addition = [[
+    line 1
+    line 2
+    line 3
+    line 4
+    ]]
+
+    helpers.write_file(path, '')
+    lfs.touch(path, os.time() - 10)
+    feed_command('edit '..path)
+    feed_data('\027[O')
+
+    screen:expect{grid=[[
+      {1: }                                                 |
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {5:xtest-foo                                         }|
+      :edit xtest-foo                                   |
+      {3:-- TERMINAL --}                                    |
+    ]]}
+
+    helpers.write_file(path, expected_addition)
+
+    feed_data('\027[I')
+
+    screen:expect{grid=[[
+      {1:l}ine 1                                            |
+      line 2                                            |
+      line 3                                            |
+      line 4                                            |
+      {5:xtest-foo                                         }|
+      "xtest-foo" 4L, 28C                               |
+      {3:-- TERMINAL --}                                    |
+    ]]}
+  end)
+end)