Tweak the default choose modes formats:

- Only show pane title if it is not default and not empty.
- Add a prettier time format and use that instead of long ctime().
- Remove clutter and change the order.

format.c

@@ -100,6 +100,7 @@ format_job_cmp(struct format_job *fj1, struct format_job *fj2)
 #define FORMAT_SESSIONS 0x80
 #define FORMAT_WINDOWS 0x100
 #define FORMAT_PANES 0x200
+#define FORMAT_PRETTY 0x400
 
 /* Limit on recursion. */
 #define FORMAT_LOOP_LIMIT 10
@@ -1322,6 +1323,52 @@ format_quote(const char *s)
 	return (out);
 }
 
+/* Make a prettier time. */
+static char *
+format_pretty_time(time_t t)
+{
+	struct tm       now_tm, tm;
+	time_t		now, age;
+	char		s[6];
+	int		m;
+
+	time(&now);
+	if (now < t)
+		now = t;
+	age = now - t;
+
+	localtime_r(&now, &now_tm);
+	localtime_r(&t, &tm);
+
+	/* Last 24 hours. */
+	if (age < 24 * 3600) {
+		strftime(s, sizeof s, "%H:%M", &tm);
+		return (xstrdup(s));
+	}
+
+	/* This month or last 28 days. */
+	if ((tm.tm_year == now_tm.tm_year && tm.tm_mon == now_tm.tm_mon) ||
+	    age < 28 * 24 * 3600) {
+		strftime(s, sizeof s, "%a%d", &tm);
+		return (xstrdup(s));
+	}
+
+	/* Last 12 months. */
+	if (now_tm.tm_mon == 0)
+		m = 11;
+	else
+		m = now_tm.tm_mon - 1;
+	if ((tm.tm_year == now_tm.tm_year && tm.tm_mon < now_tm.tm_mon) ||
+	    (tm.tm_year == now_tm.tm_year - 1 && tm.tm_mon > now_tm.tm_mon)) {
+		strftime(s, sizeof s, "%d%b", &tm);
+		return (xstrdup(s));
+	}
+
+	/* Older than that. */
+	strftime(s, sizeof s, "%h%y", &tm);
+	return (xstrdup(s));
+}
+
 /* Find a format entry. */
 static char *
 format_find(struct format_tree *ft, const char *key, int modifiers)
@@ -1331,9 +1378,10 @@ format_find(struct format_tree *ft, const char *key, int modifiers)
 	static char		 s[64];
 	struct options_entry	*o;
 	int			 idx;
-	char			*found, *saved;
+	char			*found = NULL, *saved;
+	const char		*errstr;
+	time_t			 t = 0;
 
-	if (~modifiers & FORMAT_TIMESTRING) {
 	o = options_parse_get(global_options, key, &idx, 0);
 	if (o == NULL && ft->wp != NULL)
 		o = options_parse_get(ft->wp->options, key, &idx, 0);
@@ -1349,22 +1397,12 @@ format_find(struct format_tree *ft, const char *key, int modifiers)
 		found = options_tostring(o, idx, 1);
 		goto found;
 	}
-	}
-	found = NULL;
 
 	fe_find.key = (char *)key;
 	fe = RB_FIND(format_entry_tree, &ft->tree, &fe_find);
 	if (fe != NULL) {
-		if (modifiers & FORMAT_TIMESTRING) {
-			if (fe->t == 0)
-				return (NULL);
-			ctime_r(&fe->t, s);
-			s[strcspn(s, "\n")] = '\0';
-			found = xstrdup(s);
-			goto found;
-		}
 		if (fe->t != 0) {
-			xasprintf(&found, "%lld", (long long)fe->t);
+			t = fe->t;
 			goto found;
 		}
 		if (fe->value == NULL && fe->cb != NULL)
@@ -1390,7 +1428,28 @@ format_find(struct format_tree *ft, const char *key, int modifiers)
 	return (NULL);
 
 found:
-	if (found == NULL)
+	if (modifiers & FORMAT_TIMESTRING) {
+		if (t == 0 && found != NULL) {
+			t = strtonum(found, 0, INT64_MAX, &errstr);
+			if (errstr != NULL)
+				t = 0;
+			free(found);
+		}
+		if (t == 0)
+			return (NULL);
+		if (modifiers & FORMAT_PRETTY)
+			found = format_pretty_time(t);
+		else {
+			ctime_r(&t, s);
+			s[strcspn(s, "\n")] = '\0';
+			found = xstrdup(s);
+		}
+		return (found);
+	}
+
+	if (t != 0)
+		xasprintf(&found, "%lld", (long long)t);
+	else if (found == NULL)
 		return (NULL);
 	if (modifiers & FORMAT_BASENAME) {
 		saved = found;
@@ -1532,7 +1591,7 @@ format_build_modifiers(struct format_tree *ft, const char **s, u_int *count)
 			cp++;
 
 		/* Check single character modifiers with no arguments. */
-		if (strchr("lbdtqETSWP<>", cp[0]) != NULL &&
+		if (strchr("lbdqETSWP<>", cp[0]) != NULL &&
 		    format_is_end(cp[1])) {
 			format_add_modifier(&list, count, cp, 1, NULL, 0);
 			cp++;
@@ -1553,7 +1612,7 @@ format_build_modifiers(struct format_tree *ft, const char **s, u_int *count)
 		}
 
 		/* Now try single character with arguments. */
-		if (strchr("mCs=pe", cp[0]) == NULL)
+		if (strchr("mCst=pe", cp[0]) == NULL)
 			break;
 		c = cp[0];
 
@@ -1991,6 +2050,10 @@ format_replace(struct format_tree *ft, const char *key, size_t keylen,
 				break;
 			case 't':
 				modifiers |= FORMAT_TIMESTRING;
+				if (fm->argc < 1)
+					break;
+				if (strchr(fm->argv[0], 'p') != NULL)
+					modifiers |= FORMAT_PRETTY;
 				break;
 			case 'q':
 				modifiers |= FORMAT_QUOTE;

tmux.1

@@ -4353,6 +4353,10 @@ gives
 .Ql #{t:window_activity}
 gives
 .Ql Sun Oct 25 09:25:02 2015 .
+Adding
+.Ql p (
+.Ql `t/p` )
+will use shorter but less accurate time format for times in the past.
 The
 .Ql b:\&
 and

window-buffer.c

@@ -37,7 +37,7 @@ static void		 window_buffer_key(struct window_mode_entry *,
 #define WINDOW_BUFFER_DEFAULT_COMMAND "paste-buffer -b '%%'"
 
 #define WINDOW_BUFFER_DEFAULT_FORMAT \
-	"#{buffer_size} bytes (#{t:buffer_created})"
+	"#{t/p:buffer_created}: #{buffer_sample}"
 
 static const struct menu_item window_buffer_menu_items[] = {
 	{ "Paste", 'p', NULL },

window-client.c

@@ -37,8 +37,7 @@ static void		 window_client_key(struct window_mode_entry *,
 #define WINDOW_CLIENT_DEFAULT_COMMAND "detach-client -t '%%'"
 
 #define WINDOW_CLIENT_DEFAULT_FORMAT \
-	"session #{session_name} " \
+	"#{t/p:client_activity}: session #{session_name}"
-	"(#{client_width}x#{client_height}, #{t:client_activity})"
 
 static const struct menu_item window_client_menu_items[] = {
 	{ "Detach", 'd', NULL },

window-tree.c

@@ -38,13 +38,13 @@ static void		 window_tree_key(struct window_mode_entry *,
 #define WINDOW_TREE_DEFAULT_FORMAT \
 	"#{?pane_format," \
 		"#{?pane_marked,#[reverse],}" \
-		"#{pane_current_command}#{?pane_active,*,}#{?pane_marked,M,} \"#{pane_title}\"" \
+		"#{pane_current_command}#{?pane_active,*,}#{?pane_marked,M,}" \
+		"#{?#{&&:#{pane_title},#{!=:#{pane_title},#{host_short}}},: \"#{pane_title}\",}" \
 	"," \
 		"#{?window_format," \
 			"#{?window_marked_flag,#[reverse],}" \
 			"#{window_name}#{window_flags}" \
-			"(#{window_panes} panes)" \
+			"#{?#{&&:#{==:#{window_panes},1},#{&&:#{pane_title},#{!=:#{pane_title},#{host_short}}}},: \"#{pane_title}\",}" \
-			"#{?#{==:#{window_panes},1}, \"#{pane_title}\",}" \
 		"," \
 			"#{session_windows} windows" \
 			"#{?session_grouped, " \