From 2fef10b9ac926de223e0e88b2d77489e983f62e5 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Fri, 5 May 2017 11:59:47 +0000
Subject: [PATCH] Add some formats to look at the session window stack,
 suggested by Scott ROCHFORD.

---
 format.c | 67 +++++++++++++++++++++++++++++++++++++++-----------------
 tmux.1   |  2 ++
 2 files changed, 49 insertions(+), 20 deletions(-)

diff --git a/format.c b/format.c
index 133ab779..b64af61e 100644
--- a/format.c
+++ b/format.c
@@ -42,25 +42,6 @@ typedef void (*format_cb)(struct format_tree *, struct format_entry *);
 static char	*format_job_get(struct format_tree *, const char *);
 static void	 format_job_timer(int, short, void *);
 
-static void	 format_cb_host(struct format_tree *, struct format_entry *);
-static void	 format_cb_host_short(struct format_tree *,
-		     struct format_entry *);
-static void	 format_cb_pid(struct format_tree *, struct format_entry *);
-static void	 format_cb_session_alerts(struct format_tree *,
-		     struct format_entry *);
-static void	 format_cb_window_layout(struct format_tree *,
-		     struct format_entry *);
-static void	 format_cb_window_visible_layout(struct format_tree *,
-		     struct format_entry *);
-static void	 format_cb_start_command(struct format_tree *,
-		     struct format_entry *);
-static void	 format_cb_current_command(struct format_tree *,
-		     struct format_entry *);
-static void	 format_cb_history_bytes(struct format_tree *,
-		     struct format_entry *);
-static void	 format_cb_pane_tabs(struct format_tree *,
-		     struct format_entry *);
-
 static char	*format_find(struct format_tree *, const char *, int);
 static void	 format_add_cb(struct format_tree *, const char *, format_cb);
 static void	 format_add_tv(struct format_tree *, const char *,
@@ -126,6 +107,7 @@ struct format_entry {
 /* Format entry tree. */
 struct format_tree {
 	struct window		*w;
+	struct winlink		*wl;
 	struct session		*s;
 	struct window_pane	*wp;
 
@@ -416,7 +398,7 @@ format_cb_session_alerts(struct format_tree *ft, struct format_entry *fe)
 {
 	struct session	*s = ft->s;
 	struct winlink	*wl;
-	char		 alerts[256], tmp[16];
+	char		 alerts[1024], tmp[16];
 
 	if (s == NULL)
 		return;
@@ -440,6 +422,48 @@ format_cb_session_alerts(struct format_tree *ft, struct format_entry *fe)
 	fe->value = xstrdup(alerts);
 }
 
+/* Callback for session_stack. */
+static void
+format_cb_session_stack(struct format_tree *ft, struct format_entry *fe)
+{
+	struct session	*s = ft->s;
+	struct winlink	*wl;
+	char		 result[1024], tmp[16];
+
+	if (s == NULL)
+		return;
+
+	xsnprintf(result, sizeof result, "%u", s->curw->idx);
+	TAILQ_FOREACH(wl, &s->lastw, sentry) {
+		xsnprintf(tmp, sizeof tmp, "%u", wl->idx);
+
+		if (*result != '\0')
+			strlcat(result, ",", sizeof result);
+		strlcat(result, tmp, sizeof result);
+	}
+	fe->value = xstrdup(result);
+}
+
+/* Callback for window_stack_index. */
+static void
+format_cb_window_stack_index(struct format_tree *ft, struct format_entry *fe)
+{
+	struct session	*s = ft->wl->session;
+	struct winlink	*wl;
+	u_int		 idx;
+
+	idx = 0;
+	TAILQ_FOREACH(wl, &s->lastw, sentry) {
+		idx++;
+		if (wl == ft->wl)
+			break;
+	}
+	if (wl != NULL)
+		xasprintf(&fe->value, "%u", idx);
+	else
+		fe->value = xstrdup("0");
+}
+
 /* Callback for window_layout. */
 static void
 format_cb_window_layout(struct format_tree *ft, struct format_entry *fe)
@@ -1200,6 +1224,7 @@ format_defaults_session(struct format_tree *ft, struct session *s)
 	format_add(ft, "session_many_attached", "%d", s->attached > 1);
 
 	format_add_cb(ft, "session_alerts", format_cb_session_alerts);
+	format_add_cb(ft, "session_stack", format_cb_session_stack);
 }
 
 /* Set default format keys for a client. */
@@ -1286,10 +1311,12 @@ format_defaults_winlink(struct format_tree *ft, struct winlink *wl)
 
 	if (ft->w == NULL)
 		ft->w = wl->window;
+	ft->wl = wl;
 
 	format_defaults_window(ft, w);
 
 	format_add(ft, "window_index", "%d", wl->idx);
+	format_add_cb(ft, "window_stack_index", format_cb_window_stack_index);
 	format_add(ft, "window_flags", "%s", window_printable_flags(wl));
 	format_add(ft, "window_active", "%d", wl == s->curw);
 
diff --git a/tmux.1 b/tmux.1
index 23a28a1f..39e8d0df 100644
--- a/tmux.1
+++ b/tmux.1
@@ -3586,6 +3586,7 @@ The following variables are available, where appropriate:
 .It Li "session_id" Ta "" Ta "Unique session ID"
 .It Li "session_many_attached" Ta "" Ta "1 if multiple clients attached"
 .It Li "session_name" Ta "#S" Ta "Name of session"
+.It Li "session_stack" Ta "" Ta "Window indexes in most recent order"
 .It Li "session_width" Ta "" Ta "Width of session"
 .It Li "session_windows" Ta "" Ta "Number of windows in session"
 .It Li "socket_path" Ta "" Ta "Server socket path"
@@ -3605,6 +3606,7 @@ The following variables are available, where appropriate:
 .It Li "window_name" Ta "#W" Ta "Name of window"
 .It Li "window_panes" Ta "" Ta "Number of panes in window"
 .It Li "window_silence_flag" Ta "" Ta "1 if window has silence alert"
+.It Li "window_stack_index" Ta "" Ta "Index in session most recent stack"
 .It Li "window_visible_layout" Ta "" Ta "Window layout description, respecting zoomed window panes"
 .It Li "window_width" Ta "" Ta "Width of window"
 .It Li "window_zoomed_flag" Ta "" Ta "1 if window is zoomed"