patch 9.1.0507: hard to detect cursor movement in the command line

Problem:  hard to detect cursor movement in the command line
Solution: Add the CursorMovedC autocommand
          (Shougo Matsushita)

closes: #15040

Signed-off-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/autocmd.txt

@@ -1,4 +1,4 @@
-*autocmd.txt*   For Vim version 9.1.  Last change: 2024 May 05
+*autocmd.txt*   For Vim version 9.1.  Last change: 2024 Jun 20
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -379,6 +379,7 @@ Name			triggered by ~
 |CursorHold|		the user doesn't press a key for a while
 |CursorHoldI|		the user doesn't press a key for a while in Insert mode
 |CursorMoved|		the cursor was moved in Normal mode
+|CursorMovedC|		the cursor was moved in the |Command-line|
 |CursorMovedI|		the cursor was moved in Insert mode
 
 |WinNewPre|		before creating a new window
@@ -748,6 +749,13 @@ CursorMoved			After the cursor was moved in Normal or Visual
 				Careful: This is triggered very often, don't
 				do anything that the user does not expect or
 				that is slow.
+							*CursorMovedC*
+CursorMovedC			After the cursor was moved in the command
+				line. Be careful not to mess up the
+				command line, it may cause Vim to lock up.
+				<afile> is set to a single character,
+				indicating the type of command-line.
+				|cmdwin-char|
 							*CursorMovedI*
 CursorMovedI			After the cursor was moved in Insert mode.
 				Not triggered when the popup menu is visible.

runtime/doc/tags

@@ -4063,6 +4063,7 @@ CursorHold-example	windows.txt	/*CursorHold-example*
 CursorHoldI	autocmd.txt	/*CursorHoldI*
 CursorIM	mbyte.txt	/*CursorIM*
 CursorMoved	autocmd.txt	/*CursorMoved*
+CursorMovedC	autocmd.txt	/*CursorMovedC*
 CursorMovedI	autocmd.txt	/*CursorMovedI*
 D	change.txt	/*D*
 DOS	os_dos.txt	/*DOS*

runtime/doc/version9.txt

@@ -1,4 +1,4 @@
-*version9.txt*  For Vim version 9.1.  Last change: 2024 Jun 19
+*version9.txt*  For Vim version 9.1.  Last change: 2024 Jun 20
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41591,6 +41591,7 @@ Functions: ~
 
 Autocommands: ~
 
+|CursorMovedC|		after the cursor was moved in the comamnd-line
 |SessionWritePost|	after writing the session file |:mksession|
 |TermResponseAll|	after the terminal response to |t_RV| and others is
 			received

src/autocmd.c

@@ -120,6 +120,7 @@ static keyvalue_T event_tab[] = {
     KEYVALUE_ENTRY(EVENT_CURSORHOLD, "CursorHold"),
     KEYVALUE_ENTRY(EVENT_CURSORHOLDI, "CursorHoldI"),
     KEYVALUE_ENTRY(EVENT_CURSORMOVED, "CursorMoved"),
+    KEYVALUE_ENTRY(EVENT_CURSORMOVEDC, "CursorMovedC"),
     KEYVALUE_ENTRY(EVENT_CURSORMOVEDI, "CursorMovedI"),
     KEYVALUE_ENTRY(EVENT_DIFFUPDATED, "DiffUpdated"),
     KEYVALUE_ENTRY(EVENT_DIRCHANGED, "DirChanged"),
@@ -2250,6 +2251,7 @@ apply_autocmds_group(
 		|| event == EVENT_CMDLINECHANGED
 		|| event == EVENT_CMDLINEENTER
 		|| event == EVENT_CMDLINELEAVE
+		|| event == EVENT_CURSORMOVEDC
 		|| event == EVENT_CMDWINENTER
 		|| event == EVENT_CMDWINLEAVE
 		|| event == EVENT_CMDUNDEFINED

src/ex_getln.c

@@ -1586,6 +1586,7 @@ getcmdline_int(
     int		res;
     int		save_msg_scroll = msg_scroll;
     int		save_State = State;	// remember State when called
+    int		save_cmdspos = ccline.cmdspos;
     int		some_key_typed = FALSE;	// one of the keys was typed
     // mouse drag and release events are ignored, unless they are
     // preceded with a mouse down event
@@ -2473,6 +2474,10 @@ getcmdline_int(
  * (Sorry for the goto's, I know it is ugly).
  */
 cmdline_not_changed:
+	 // Trigger CursorMovedC autocommands.
+	 if (ccline.cmdspos != save_cmdspos)
+	    trigger_cmd_autocmd(cmdline_type, EVENT_CURSORMOVEDC);
+
 #ifdef FEAT_SEARCH_EXTRA
 	if (!is_state.incsearch_postponed)
 	    continue;
@@ -2484,8 +2489,8 @@ cmdline_changed:
 	if (is_state.winid != curwin->w_id)
 	    init_incsearch_state(&is_state);
 #endif
-	if (trigger_cmdlinechanged)
 	// Trigger CmdlineChanged autocommands.
+	if (trigger_cmdlinechanged)
 	    trigger_cmd_autocmd(cmdline_type, EVENT_CMDLINECHANGED);
 
 #ifdef FEAT_SEARCH_EXTRA
@@ -4315,6 +4320,10 @@ set_cmdline_pos(
 	new_cmdpos = 0;
     else
 	new_cmdpos = pos;
+
+    // Trigger CursorMovedC autocommands.
+    trigger_cmd_autocmd(get_cmdline_type(), EVENT_CURSORMOVEDC);
+
     return 0;
 }
 

src/testdir/test_autocmd.vim

@@ -2096,6 +2096,21 @@ func Test_Cmdline()
   au! CmdlineEnter
   au! CmdlineLeave
   let &shellslash = save_shellslash
+
+  au! CursorMovedC : let g:pos = getcmdpos()
+  let g:pos = 0
+  call feedkeys(":hello\<Left>\<ESC>", 'xt')
+  call assert_equal(5, g:pos)
+  call feedkeys(":12345678\<C-R>=setcmdpos(3)\<CR>\<ESC>", 'xt')
+  call assert_equal(3, g:pos)
+  au! CursorMovedC
+
+  " CursorMovedC changes the cursor position.
+  au! CursorMovedC : let g:pos = getcmdpos() | call setcmdpos(getcmdpos()-1)
+  let g:pos = 0
+  call feedkeys(":hello\<Left>\<ESC>", 'xt')
+  call assert_equal(5, g:pos)
+  au! CursorMovedC
 endfunc
 
 " Test for BufWritePre autocommand that deletes or unloads the buffer.

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    507,
 /**/
     506,
 /**/

src/vim.h

@@ -1361,6 +1361,7 @@ enum auto_event
     EVENT_CURSORHOLD,		// cursor in same position for a while
     EVENT_CURSORHOLDI,		// idem, in Insert mode
     EVENT_CURSORMOVED,		// cursor was moved
+    EVENT_CURSORMOVEDC,		// cursor was moved in Command line mode
     EVENT_CURSORMOVEDI,		// cursor was moved in Insert mode
     EVENT_DIFFUPDATED,		// after diffs were updated
     EVENT_DIRCHANGED,		// after user changed directory