add log messages page

The new command `<show-messages>` will show a backlog of 100 messages
from:
- mutt_message()
- mutt_error()
- mutt_perror()
- mutt_debug() if enabled

curs_main.c

@@ -47,6 +47,7 @@
 #include "ncrypt/ncrypt.h"
 #include "opcodes.h"
 #include "options.h"
+#include "pager.h"
 #include "pattern.h"
 #include "protos.h"
 #include "sort.h"
@@ -1489,6 +1490,25 @@ int mutt_index_menu(void)
         break;
 #endif /* USE_POP */
 
+      case OP_SHOW_MESSAGES:
+      {
+        char tempfile[PATH_MAX];
+        mutt_mktemp(tempfile, sizeof(tempfile));
+
+        FILE *fp = mutt_file_fopen(tempfile, "a+");
+        if (!fp)
+        {
+          mutt_perror("fopen");
+          break;
+        }
+
+        log_queue_save(fp);
+        mutt_file_fclose(&fp);
+
+        mutt_do_pager("messages", tempfile, MUTT_PAGER_LOGS, NULL);
+        break;
+      }
+
       case OP_HELP:
 
         mutt_help(MENU_MAIN);

functions.h

@@ -92,6 +92,7 @@ const struct Binding OpGeneric[] = { /* map: generic */
 };
 
 const struct Binding OpMain[] = { /* map: index */
+  { "show-messages",             OP_SHOW_MESSAGES,                  "M" },
   { "create-alias",              OP_CREATE_ALIAS,                   "a" },
   { "bounce-message",            OP_BOUNCE_MESSAGE,                 "b" },
   { "break-thread",              OP_MAIN_BREAK_THREAD,              "#" },

mutt/logging.c

@@ -342,6 +342,36 @@ void log_queue_flush(log_dispatcher_t disp)
   log_queue_empty();
 }
 
+/**
+ * log_queue_save - Save the contents of the queue to a temporary file
+ * @param fp Open file handle
+ * @retval num Number of lines written to the file
+ *
+ * The queue is written to a temporary file.  The format is:
+ * * `[HH:MM:SS]<LEVEL> FORMATTED-MESSAGE`
+ *
+ * @note The caller should free the returned string and delete the file.
+ */
+int log_queue_save(FILE *fp)
+{
+  if (!fp)
+    return 0;
+
+  char buf[32];
+  int count = 0;
+  struct LogLine *ll = NULL;
+  STAILQ_FOREACH(ll, &LogQueue, entries)
+  {
+    strftime(buf, sizeof(buf), "%H:%M:%S", localtime(&ll->time));
+    fprintf(fp, "[%s]<%c> %s", buf, LevelAbbr[ll->level + 3], ll->message);
+    if (ll->level <= 0)
+      fputs("\n", fp);
+    count++;
+  }
+
+  return count;
+}
+
 /**
  * log_disp_queue - Save a log line to an internal queue
  * @param stamp    Unix time

mutt/logging.h

@@ -83,6 +83,7 @@ int log_disp_terminal(time_t stamp, const char *file, int line, const char *func
 int  log_queue_add(struct LogLine *ll);
 void log_queue_empty(void);
 void log_queue_flush(log_dispatcher_t disp);
+int  log_queue_save(FILE *fp);
 void log_queue_set_max_size(int size);
 
 void log_file_close(bool verbose);

mutt_curses.h

@@ -163,6 +163,7 @@ enum ColorId
   MT_COLOR_SB_INDICATOR,
   MT_COLOR_SB_SPOOLFILE,
 #endif
+  MT_COLOR_MESSAGE_LOG,
   /* please no non-MT_COLOR_INDEX objects after this point */
   MT_COLOR_INDEX,
   MT_COLOR_INDEX_AUTHOR,

mutt_logging.c

@@ -171,6 +171,8 @@ int log_disp_curses(time_t stamp, const char *file, int line,
   }
 
   log_disp_file(stamp, file, line, function, level, "%s", buf);
+  if (stamp == 0)
+    log_disp_queue(stamp, file, line, function, level, "%s", buf);
 
   /* Don't display debugging message on screen */
   if (level > LL_MESSAGE)

opcodes.h

@@ -27,6 +27,7 @@
 
 #define OPS_CORE(_fmt) \
   _fmt(OP_NULL,                           N_("null operation")) \
+  _fmt(OP_SHOW_MESSAGES,                  N_("show messages")) \
   _fmt(OP_END_COND,                       N_("end of conditional execution (noop)")) \
   _fmt(OP_ATTACH_VIEW_MAILCAP,            N_("force viewing of attachment using mailcap")) \
   _fmt(OP_ATTACH_VIEW_TEXT,               N_("view attachment as text")) \

pager.c

@@ -236,7 +236,11 @@ static void resolve_color(struct Line *line_info, int n, int cnt, int flags,
   }
   else
     m = n;
-  if (!(flags & MUTT_SHOWCOLOR))
+  if (flags & MUTT_PAGER_LOGS)
+  {
+    def_color = ColorDefs[(line_info[n].syntax)[0].color];
+  }
+  else if (!(flags & MUTT_SHOWCOLOR))
     def_color = ColorDefs[MT_COLOR_NORMAL];
   else if (line_info[m].type == MT_COLOR_HEADER)
     def_color = (line_info[m].syntax)[0].color;
@@ -1015,6 +1019,16 @@ static void resolve_types(char *buf, char *raw, struct Line *line_info, int n,
     if (nl > 0)
       buf[nl] = '\n';
   }
+
+  if (line_info[n].type == MT_COLOR_MESSAGE_LOG)
+  {
+    line_info[n].chunks = 1;
+    line_info[n].syntax = mutt_mem_calloc(1, sizeof(struct Syntax));
+
+    (line_info[n].syntax)[i].color = MT_COLOR_ERROR;
+    (line_info[n].syntax)[i].first = 5;
+    (line_info[n].syntax)[i].last = 10;
+  }
 }
 
 static int is_ansi(unsigned char *buf)
@@ -1446,6 +1460,25 @@ static int display_line(FILE *f, LOFF_T *last_pos, struct Line **line_info,
     }
   }
 
+  if (flags & MUTT_PAGER_LOGS)
+  {
+    /* determine the line class */
+    if (fill_buffer(f, last_pos, (*line_info)[n].offset, &buf, &fmt, &buflen, &buf_ready) < 0)
+    {
+      if (change_last)
+        (*last)--;
+      goto out;
+    }
+
+    (*line_info)[n].type = MT_COLOR_MESSAGE_LOG;
+    if (buf[11] == 'M')
+      (*line_info)[n].syntax[0].color = MT_COLOR_MESSAGE;
+    else if (buf[11] == 'E')
+      (*line_info)[n].syntax[0].color = MT_COLOR_ERROR;
+    else
+      (*line_info)[n].syntax[0].color = MT_COLOR_NORMAL;
+  }
+
   /* only do color highlighting if we are viewing a message */
   if (flags & (MUTT_SHOWCOLOR | MUTT_TYPES))
   {

pager.h

@@ -43,8 +43,9 @@ struct Menu;
 #define MUTT_PAGER_MESSAGE    (MUTT_SHOWCOLOR | MUTT_PAGER_MARKER)
 #define MUTT_PAGER_ATTACHMENT (1 << 8)
 #define MUTT_PAGER_NOWRAP     (1 << 9)    /**< format for term width, ignore $wrap */
+#define MUTT_PAGER_LOGS       (1 << 10)   /**< Logview mode */
 
-#define MUTT_DISPLAYFLAGS (MUTT_SHOW | MUTT_PAGER_NSKIP | MUTT_PAGER_MARKER)
+#define MUTT_DISPLAYFLAGS (MUTT_SHOW | MUTT_PAGER_NSKIP | MUTT_PAGER_MARKER | MUTT_PAGER_LOGS)
 
 /**
  * struct Pager - An email being displayed