patch 8.0.1206: no autocmd for entering or leaving the command line

Problem:    No autocmd for entering or leaving the command line.
Solution:   Add CmdlineEnter and CmdlineLeave.

runtime/doc/autocmd.txt

@@ -492,6 +492,18 @@ CmdUndefined			When a user command is used but it isn't
 				command is defined.  An alternative is to
 				always define the user command and have it
 				invoke an autoloaded function.  See |autoload|.
+							*CmdlineEnter*
+CmdlineEnter			After moving the cursor to the command line,
+				where the user can type a command or search
+				string.
+				<afile> is set to a single character,
+				indicating the type of command-line.
+				|cmdwin-char|
+							*CmdlineLeave*
+CmdlineLeave			Before leaving the command line.
+				<afile> is set to a single character,
+				indicating the type of command-line.
+				|cmdwin-char|
 							*CmdwinEnter*
 CmdwinEnter			After entering the command-line window.
 				Useful for setting options specifically for

src/ex_getln.c

@@ -145,6 +145,19 @@ sort_func_compare(const void *s1, const void *s2);
 static void set_search_match(pos_T *t);
 #endif
 
+
+#ifdef FEAT_AUTOCMD
+    static void
+trigger_cmd_autocmd(int typechar, int evt)
+{
+    char_u	typestr[2];
+
+    typestr[0] = typechar;
+    typestr[1] = NUL;
+    apply_autocmds(evt, typestr, typestr, FALSE, curbuf);
+}
+#endif
+
 /*
  * getcmdline() - accept a command line starting with firstc.
  *
@@ -222,6 +235,9 @@ getcmdline(
      * custom status line may invoke ":normal". */
     struct cmdline_info save_ccline;
 #endif
+#ifdef FEAT_AUTOCMD
+    int		cmdline_type;
+#endif
 
 #ifdef FEAT_EVAL
     if (firstc == -1)
@@ -349,6 +365,12 @@ getcmdline(
      * terminal mode set to cooked.  Need to set raw mode here then. */
     settmode(TMODE_RAW);
 
+#ifdef FEAT_AUTOCMD
+    /* Trigger CmdlineEnter autocommands. */
+    cmdline_type = firstc == NUL ? '-' : firstc;
+    trigger_cmd_autocmd(cmdline_type, EVENT_CMDLINEENTER);
+#endif
+
 #ifdef FEAT_CMDHIST
     init_history();
     hiscnt = hislen;		/* set hiscnt to impossible history value */
@@ -2085,6 +2107,11 @@ returncmd:
     if (some_key_typed)
 	need_wait_return = FALSE;
 
+#ifdef FEAT_AUTOCMD
+    /* Trigger CmdlineLeave autocommands. */
+    trigger_cmd_autocmd(cmdline_type, EVENT_CMDLINELEAVE);
+#endif
+
     State = save_State;
 #ifdef USE_IM_CONTROL
     if (b_im_ptr != NULL && *b_im_ptr != B_IMODE_LMAP)
@@ -6834,9 +6861,6 @@ open_cmdwin(void)
     linenr_T		lnum;
     int			histtype;
     garray_T		winsizes;
-#ifdef FEAT_AUTOCMD
-    char_u		typestr[2];
-#endif
     int			save_restart_edit = restart_edit;
     int			save_State = State;
     int			save_exmode = exmode_active;
@@ -6965,9 +6989,7 @@ open_cmdwin(void)
 
 # ifdef FEAT_AUTOCMD
     /* Trigger CmdwinEnter autocommands. */
-    typestr[0] = cmdwin_type;
-    typestr[1] = NUL;
-    apply_autocmds(EVENT_CMDWINENTER, typestr, typestr, FALSE, curbuf);
+    trigger_cmd_autocmd(cmdwin_type, EVENT_CMDWINENTER);
     if (restart_edit != 0)	/* autocmd with ":startinsert" */
 	stuffcharReadbuff(K_NOP);
 # endif
@@ -6990,7 +7012,7 @@ open_cmdwin(void)
 #  endif
 
     /* Trigger CmdwinLeave autocommands. */
-    apply_autocmds(EVENT_CMDWINLEAVE, typestr, typestr, FALSE, curbuf);
+    trigger_cmd_autocmd(cmdwin_type, EVENT_CMDWINLEAVE);
 
 #  ifdef FEAT_FOLDING
     /* Restore KeyTyped in case it is modified by autocommands */

src/fileio.c

@@ -7731,6 +7731,8 @@ static struct event_name
     {"BufWritePost",	EVENT_BUFWRITEPOST},
     {"BufWritePre",	EVENT_BUFWRITEPRE},
     {"BufWriteCmd",	EVENT_BUFWRITECMD},
+    {"CmdlineEnter",	EVENT_CMDLINEENTER},
+    {"CmdlineLeave",	EVENT_CMDLINELEAVE},
     {"CmdwinEnter",	EVENT_CMDWINENTER},
     {"CmdwinLeave",	EVENT_CMDWINLEAVE},
     {"CmdUndefined",	EVENT_CMDUNDEFINED},

src/testdir/test_autocmd.vim

@@ -793,3 +793,25 @@ func Test_QuitPre()
   bwipe Xfoo
   bwipe Xbar
 endfunc
+
+func Test_Cmdline()
+  au! CmdlineEnter : let g:entered = expand('<afile>')
+  au! CmdlineLeave : let g:left = expand('<afile>')
+  let g:entered = 0
+  let g:left = 0
+  call feedkeys(":echo 'hello'\<CR>", 'xt')
+  call assert_equal(':', g:entered)
+  call assert_equal(':', g:left)
+  au! CmdlineEnter
+  au! CmdlineLeave
+
+  au! CmdlineEnter / let g:entered = expand('<afile>')
+  au! CmdlineLeave / let g:left = expand('<afile>')
+  let g:entered = 0
+  let g:left = 0
+  call feedkeys("/hello<CR>", 'xt')
+  call assert_equal('/', g:entered)
+  call assert_equal('/', g:left)
+  au! CmdlineEnter
+  au! CmdlineLeave
+endfunc

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1206,
 /**/
     1205,
 /**/

src/vim.h

@@ -1295,6 +1295,8 @@ enum auto_event
     EVENT_BUFWRITEPOST,		/* after writing a buffer */
     EVENT_BUFWRITEPRE,		/* before writing a buffer */
     EVENT_BUFWRITECMD,		/* write buffer using command */
+    EVENT_CMDLINEENTER,		/* after entering the command line */
+    EVENT_CMDLINELEAVE,		/* before leaving the command line */
     EVENT_CMDWINENTER,		/* after entering the cmdline window */
     EVENT_CMDWINLEAVE,		/* before leaving the cmdline window */
     EVENT_COLORSCHEME,		/* after loading a colorscheme */