Hi Bram and list,

Type `:messages ` and push Tab key.

None patched behavior:
- Output Ctrl-I code
  :messages ^I

Patched behavior:
- Complete `clear`
  :messages clear


Attach a patch. (Contains a test)
Check it please.
--
Best regards,
Hirohito Higashi (a.k.a. h_east)

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diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index ac7beb7..6802b8b 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -4281,6 +4281,11 @@ set_one_cmd_context(
 	    xp->xp_pattern = arg;
 	    break;
 
+	case CMD_messages:
+	    xp->xp_context = EXPAND_MESSAGES;
+	    xp->xp_pattern = arg;
+	    break;
+
 #if defined(FEAT_CMDHIST)
 	case CMD_history:
 	    xp->xp_context = EXPAND_HISTORY;
@@ -5893,6 +5898,7 @@ static struct
 #endif
     {EXPAND_MAPPINGS, "mapping"},
     {EXPAND_MENUS, "menu"},
+    {EXPAND_MESSAGES, "messages"},
     {EXPAND_OWNSYNTAX, "syntax"},
 #if defined(FEAT_PROFILE)
     {EXPAND_SYNTIME, "syntime"},
@@ -11901,6 +11907,18 @@ get_behave_arg(expand_T *xp UNUSED, int idx)
 	return (char_u *)"xterm";
     return NULL;
 }
+
+/*
+ * Function given to ExpandGeneric() to obtain the possible arguments of the
+ * ":messages {clear}" command.
+ */
+    char_u *
+get_messages_arg(expand_T *xp UNUSED, int idx)
+{
+    if (idx == 0)
+	return (char_u *)"clear";
+    return NULL;
+}
 #endif
 
 #ifdef FEAT_AUTOCMD
diff --git a/src/ex_getln.c b/src/ex_getln.c
index 25a12be..5d098cc 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -4832,6 +4832,7 @@ ExpandFromContext(
 	{
 	    {EXPAND_COMMANDS, get_command_name, FALSE, TRUE},
 	    {EXPAND_BEHAVE, get_behave_arg, TRUE, TRUE},
+	    {EXPAND_MESSAGES, get_messages_arg, TRUE, TRUE},
 #ifdef FEAT_CMDHIST
 	    {EXPAND_HISTORY, get_history_arg, TRUE, TRUE},
 #endif
diff --git a/src/proto/ex_docmd.pro b/src/proto/ex_docmd.pro
index b92ce80..11a3f71 100644
--- a/src/proto/ex_docmd.pro
+++ b/src/proto/ex_docmd.pro
@@ -61,4 +61,5 @@ int put_eol(FILE *fd);
 int put_line(FILE *fd, char *s);
 void dialog_msg(char_u *buff, char *format, char_u *fname);
 char_u *get_behave_arg(expand_T *xp, int idx);
+char_u *get_messages_arg(expand_T *xp, int idx);
 /* vim: set ft=c : */
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 4bacf57..3718087 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -129,6 +129,11 @@ func Test_getcompletion()
   let l = getcompletion('dark', 'highlight')
   call assert_equal([], l)
 
+  let l = getcompletion('', 'messages')
+  call assert_true(index(l, 'clear') >= 0)
+  let l = getcompletion('not', 'messages')
+  call assert_equal([], l)
+
   if has('cscope')
     let l = getcompletion('', 'cscope')
     let cmds = ['add', 'find', 'help', 'kill', 'reset', 'show']
diff --git a/src/vim.h b/src/vim.h
index a787575..0ac296e 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -793,6 +793,7 @@ extern char *(*dyn_libintl_textdomain)(const char *domainname);
 #define EXPAND_SYNTIME		43
 #define EXPAND_USER_ADDR_TYPE	44
 #define EXPAND_PACKADD		45
+#define EXPAND_MESSAGES		46
 
 /* Values for exmode_active (0 is no exmode) */
 #define EXMODE_NORMAL		1

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