From 811c45163c5613981c8e5abdca40e28c1b61d076 Mon Sep 17 00:00:00 2001
From: Jurica Bradaric <jbradaric@gmail.com>
Date: Tue, 25 Jul 2017 18:30:28 +0200
Subject: [PATCH] vim-patch:8.0.0034

Problem:    No completion for ":messages".
Solution:   Complete "clear" argument. (Hirohito Higashi)

https://github.com/vim/vim/commit/9e507ca8a3e1535e62de4bd86374b0fcd18ef5b8
---
 runtime/doc/eval.txt              |  2 ++
 runtime/doc/map.txt               |  1 +
 src/nvim/ex_docmd.c               | 16 ++++++++++++++++
 src/nvim/ex_getln.c               |  1 +
 src/nvim/testdir/test_cmdline.vim |  5 +++++
 src/nvim/version.c                |  2 +-
 src/nvim/vim.h                    |  1 +
 7 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 8882043162..3e75a42a62 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -4046,7 +4046,9 @@ getcompletion({pat}, {type} [, {filtered}])		*getcompletion()*
 		locale		locale names (as output of locale -a)
 		mapping		mapping name
 		menu		menus
+		messages	|:messages| suboptions
 		option		options
+		packadd		optional package |pack-add| names
 		shellcmd	Shell command
 		sign		|:sign| suboptions
 		syntax		syntax file names |'syntax'|
diff --git a/runtime/doc/map.txt b/runtime/doc/map.txt
index bfcf621cb8..944f7474be 100644
--- a/runtime/doc/map.txt
+++ b/runtime/doc/map.txt
@@ -1202,6 +1202,7 @@ completion can be enabled:
 	-complete=locale	locale names (as output of locale -a)
 	-complete=mapping	mapping name
 	-complete=menu		menus
+	-complete=messages	|:messages| suboptions
 	-complete=option	options
 	-complete=packadd	optional package |pack-add| names
 	-complete=shellcmd	Shell command
diff --git a/src/nvim/ex_docmd.c b/src/nvim/ex_docmd.c
index d2eb881bc6..99a0b86d2b 100644
--- a/src/nvim/ex_docmd.c
+++ b/src/nvim/ex_docmd.c
@@ -3440,6 +3440,11 @@ const char * set_one_cmd_context(
     xp->xp_pattern = (char_u *)arg;
     break;
 
+  case CMD_messages:
+    xp->xp_context = EXPAND_MESSAGES;
+    xp->xp_pattern = (char_u *)arg;
+    break;
+
   case CMD_history:
     xp->xp_context = EXPAND_HISTORY;
     xp->xp_pattern = (char_u *)arg;
@@ -4874,6 +4879,7 @@ static struct {
 #endif
   { EXPAND_MAPPINGS, "mapping" },
   { EXPAND_MENUS, "menu" },
+  { EXPAND_MESSAGES, "messages" },
   { EXPAND_OWNSYNTAX, "syntax" },
   { EXPAND_SYNTIME, "syntime" },
   { EXPAND_SETTINGS, "option" },
@@ -9595,6 +9601,16 @@ char_u *get_behave_arg(expand_T *xp, int idx)
   return NULL;
 }
 
+// Function given to ExpandGeneric() to obtain the possible arguments of the
+// ":messages {clear}" command.
+char_u *get_messages_arg(expand_T *xp FUNC_ATTR_UNUSED, int idx)
+{
+  if (idx == 0) {
+    return (char_u *)"clear";
+  }
+  return NULL;
+}
+
 static TriState filetype_detect = kNone;
 static TriState filetype_plugin = kNone;
 static TriState filetype_indent = kNone;
diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index 0ba6c79a71..1d81a39dfe 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -4050,6 +4050,7 @@ ExpandFromContext (
     } tab[] = {
       { EXPAND_COMMANDS, get_command_name, false, true },
       { EXPAND_BEHAVE, get_behave_arg, true, true },
+      { EXPAND_MESSAGES, get_messages_arg, true, true },
       { EXPAND_HISTORY, get_history_arg, true, true },
       { EXPAND_USER_COMMANDS, get_user_commands, false, true },
       { EXPAND_USER_ADDR_TYPE, get_user_cmd_addr_type, false, true },
diff --git a/src/nvim/testdir/test_cmdline.vim b/src/nvim/testdir/test_cmdline.vim
index 0c9d1297d6..f7a6aba6e7 100644
--- a/src/nvim/testdir/test_cmdline.vim
+++ b/src/nvim/testdir/test_cmdline.vim
@@ -130,6 +130,11 @@ 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/nvim/version.c b/src/nvim/version.c
index 62e8919913..44348c4d98 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -695,7 +695,7 @@ static const int included_patches[] = {
   37,
   // 36 NA
   35,
-  // 34,
+  34,
   33,
   32,
   31,
diff --git a/src/nvim/vim.h b/src/nvim/vim.h
index c71ca411ea..62ffc7433e 100644
--- a/src/nvim/vim.h
+++ b/src/nvim/vim.h
@@ -163,6 +163,7 @@ enum {
   EXPAND_SYNTIME,
   EXPAND_USER_ADDR_TYPE,
   EXPAND_PACKADD,
+  EXPAND_MESSAGES,
 };