vim-patch:9.1.0864: message history is fixed to 200 (#31215)

Problem:  message history is fixed to 200
Solution: Add the 'msghistory' option, increase the default
          value to 500 (Shougo Matsushita)

closes: vim/vim#16048

4bd9b2b246

Co-authored-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Co-authored-by: Milly <milly.ca@gmail.com>

src/nvim/message.c

@@ -981,7 +981,7 @@ static void add_msg_hist_multihl(const char *s, int len, int hl_id, bool multili
   }
 
   // Don't let the message history get too big
-  while (msg_hist_len > MAX_MSG_HIST_LEN) {
+  while (msg_hist_len > p_mhi) {
     delete_first_msg();
   }
 

src/nvim/option.c

@@ -2874,6 +2874,13 @@ static const char *validate_num_option(OptIndex opt_idx, OptInt *newval, char *e
       return e_invarg;
     }
     break;
+  case kOptMsghistory:
+    if (value < 0) {
+      return e_positive;
+    } else if (value > 10000) {
+      return e_invarg;
+    }
+    break;
   case kOptPyxversion:
     if (value == 0) {
       *newval = 3;

src/nvim/option_vars.h

@@ -536,6 +536,7 @@ EXTERN OptInt p_mousescroll_vert INIT( = MOUSESCROLL_VERT_DFLT);
 EXTERN OptInt p_mousescroll_hor INIT( = MOUSESCROLL_HOR_DFLT);
 EXTERN OptInt p_mouset;         ///< 'mousetime'
 EXTERN int p_more;              ///< 'more'
+EXTERN OptInt p_mhi;            ///< 'msghistory'
 EXTERN char *p_nf;              ///< 'nrformats'
 EXTERN char *p_opfunc;          ///< 'operatorfunc'
 EXTERN char *p_para;            ///< 'paragraphs'

src/nvim/options.lua

@@ -3962,7 +3962,8 @@ return {
       desc = [=[
         A history of ":" commands, and a history of previous search patterns
         is remembered.  This option decides how many entries may be stored in
-        each of these histories (see |cmdline-editing|).
+        each of these histories (see |cmdline-editing| and 'msghistory' for
+        the number of messages to remember).
         The maximum value is 10000.
       ]=],
       full_name = 'history',
@@ -5757,6 +5758,19 @@ return {
       type = 'number',
       varname = 'p_mouset',
     },
+    {
+      abbreviation = 'mhi',
+      defaults = { if_true = 500 },
+      desc = [=[
+        Determines how many entries are remembered in the |:messages| history.
+        The maximum value is 10000.
+      ]=],
+      full_name = 'msghistory',
+      scope = { 'global' },
+      short_desc = N_('how many messages are remembered'),
+      type = 'number',
+      varname = 'p_mhi',
+    },
     {
       abbreviation = 'nf',
       cb = 'did_set_nrformats',

src/nvim/vim_defs.h

@@ -2,7 +2,6 @@
 
 // Some defines from the old feature.h
 #define SESSION_FILE "Session.vim"
-#define MAX_MSG_HIST_LEN 200
 #define SYS_OPTWIN_FILE "$VIMRUNTIME/optwin.vim"
 #define RUNTIME_DIRNAME "runtime"