vim-patch:8.2.3617: ":verbose pwd" does not mention 'autochdir' was applied

Problem:    ":verbose pwd" does not mention 'autochdir' was applied.
Solution:   Remember the last chdir was done by 'autochdir'.  (issue vim/vim#9142)
0526815c15

src/nvim/buffer.c

@@ -1588,6 +1588,7 @@ void do_autochdir(void)
         && curbuf->b_ffname != NULL
         && vim_chdirfile(curbuf->b_ffname, kCdCauseAuto) == OK) {
       post_chdir(kCdScopeGlobal, false);
+      last_chdir_reason = "autochdir";
       shorten_fnames(true);
     }
   }

src/nvim/ex_docmd.c

@@ -7753,6 +7753,7 @@ void post_chdir(CdScope scope, bool trigger_dirchanged)
     abort();
   }
 
+  last_chdir_reason = NULL;
   shorten_fnames(true);
 
   if (trigger_dirchanged) {
@@ -7870,7 +7871,9 @@ static void ex_pwd(exarg_T *eap)
 #endif
     if (p_verbose > 0) {
       char *context = "global";
-      if (curwin->w_localdir != NULL) {
+      if (last_chdir_reason != NULL) {
+        context = last_chdir_reason;
+      } else if (curwin->w_localdir != NULL) {
         context = "window";
       } else if (curtab->tp_localdir != NULL) {
         context = "tabpage";

src/nvim/globals.h

@@ -789,6 +789,8 @@ extern char_u *compiled_sys;
 // directory is not a local directory, globaldir is NULL.
 EXTERN char_u *globaldir INIT(= NULL);
 
+EXTERN char *last_chdir_reason INIT(= NULL);
+
 // Whether 'keymodel' contains "stopsel" and "startsel".
 EXTERN bool km_stopsel INIT(= false);
 EXTERN bool km_startsel INIT(= false);

src/nvim/testdir/test_autochdir.vim

@@ -26,4 +26,34 @@ func Test_set_filename()
   call delete('samples/Xtest')
 endfunc
 
+func Test_verbose_pwd()
+  CheckFunction test_autochdir
+  let cwd = getcwd()
+  call test_autochdir()
+
+  edit global.txt
+  call assert_match('\[global\].*testdir$', execute('verbose pwd'))
+
+  call mkdir('Xautodir')
+  split Xautodir/local.txt
+  lcd Xautodir
+  call assert_match('\[window\].*testdir[/\\]Xautodir', execute('verbose pwd'))
+
+  set acd
+  wincmd w
+  call assert_match('\[autochdir\].*testdir$', execute('verbose pwd'))
+  wincmd w
+  call assert_match('\[autochdir\].*testdir[/\\]Xautodir', execute('verbose pwd'))
+  set noacd
+  call assert_match('\[autochdir\].*testdir[/\\]Xautodir', execute('verbose pwd'))
+  wincmd w
+  call assert_match('\[global\].*testdir', execute('verbose pwd'))
+  wincmd w
+  call assert_match('\[window\].*testdir[/\\]Xautodir', execute('verbose pwd'))
+
+  bwipe!
+  call chdir(cwd)
+  call delete('Xautodir', 'rf')
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab

src/nvim/window.c

@@ -4592,6 +4592,7 @@ void fix_current_dir(void)
         do_autocmd_dirchanged(new_dir, curwin->w_localdir
                               ? kCdScopeWindow : kCdScopeTabpage, kCdCauseWindow);
       }
+      last_chdir_reason = NULL;
       shorten_fnames(true);
     }
   } else if (globaldir != NULL) {
@@ -4603,6 +4604,7 @@ void fix_current_dir(void)
       }
     }
     XFREE_CLEAR(globaldir);
+    last_chdir_reason = NULL;
     shorten_fnames(true);
   }
 }

test/functional/legacy/autochdir_spec.lua

@@ -1,10 +1,11 @@
 local lfs = require('lfs')
 local helpers = require('test.functional.helpers')(after_each)
-local clear, eq = helpers.clear, helpers.eq
-local eval, command = helpers.eval, helpers.command
+local clear, eq, matches = helpers.clear, helpers.eq, helpers.matches
+local eval, command, call = helpers.eval, helpers.command, helpers.call
+local exec_capture = helpers.exec_capture
 
 describe('autochdir behavior', function()
-  local dir = 'Xtest-functional-legacy-autochdir'
+  local dir = 'Xtest_functional_legacy_autochdir'
 
   before_each(function()
     lfs.mkdir(dir)
@@ -23,4 +24,26 @@ describe('autochdir behavior', function()
     eq('Xtest', eval("expand('%')"))
     eq(dir, eval([[substitute(getcwd(), '.*[/\\]\(\k*\)', '\1', '')]]))
   end)
+
+  it(':verbose pwd shows whether autochdir is used', function()
+    local subdir = 'Xautodir'
+    command('cd '..dir)
+    command('edit global.txt')
+    matches('%[global%].*'..dir, exec_capture('verbose pwd'))
+    call('mkdir', subdir)
+    command('split '..subdir..'/local.txt')
+    command('lcd '..subdir)
+    matches('%[window%].*'..dir..'[/\\]'..subdir, exec_capture('verbose pwd'))
+    command('set autochdir')
+    command('wincmd w')
+    matches('%[autochdir%].*'..dir, exec_capture('verbose pwd'))
+    command('wincmd w')
+    matches('%[autochdir%].*'..dir..'[/\\]'..subdir, exec_capture('verbose pwd'))
+    command('set noautochdir')
+    matches('%[autochdir%].*'..dir..'[/\\]'..subdir, exec_capture('verbose pwd'))
+    command('wincmd w')
+    matches('%[global%].*'..dir, exec_capture('verbose pwd'))
+    command('wincmd w')
+    matches('%[window%].*'..dir..'[/\\]'..subdir, exec_capture('verbose pwd'))
+  end)
 end)