Put socket path in $TMUX.

TODO

@@ -81,7 +81,6 @@
 - attach should have a flag to create session if it doesn't exist
 - swap-pane-up, swap-pane-down (maybe move-pane-*)
 - move-pane (to window) (maybe break-pane?)
-- $TMUX should contain socket path
 - 88 colour support; new grid cell flag, and 256<->88 88<->16 translation tables
 - some fix for SF feature request 2527847 - now remain-by-default has gone
   cannot control it per-session

client-fn.c

@@ -1,4 +1,4 @@
-/* $Id: client-fn.c,v 1.5 2009-01-10 14:43:43 nicm Exp $ */
+/* $Id: client-fn.c,v 1.6 2009-03-04 17:24:07 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -26,29 +26,39 @@
 void
 client_fill_session(struct msg_command_data *data)
 {
-	char		*env, *ptr, buf[256];
+	char		*env, *ptr1, *ptr2, buf[256];
+	size_t		 len;
 	const char	*errstr;
 	long long	 ll;
 
 	data->pid = -1;
 	if ((env = getenv("TMUX")) == NULL)
 		return;
-	if ((ptr = strchr(env, ',')) == NULL)
-		return;
-	if ((size_t) (ptr - env) > sizeof buf)
-		return;
-	memcpy(buf, env, ptr - env);
-	buf[ptr - env] = '\0';
 
-	ll = strtonum(ptr + 1, 0, UINT_MAX, &errstr);
+	if ((ptr2 = strrchr(env, ',')) == NULL || ptr2 == env)
-	if (errstr != NULL)
 		return;
-	data->idx = ll;
+	for (ptr1 = ptr2 - 1; ptr1 > env && *ptr1 != ','; ptr1--)
+		;
+	if (*ptr1 != ',')
+		return;
+	ptr1++;
+	ptr2++;
+
+	len = ptr2 - ptr1 - 1;
+	if (len > (sizeof buf) - 1)
+		return;
+	memcpy(buf, ptr1, len);
+	buf[len] = '\0';
 
 	ll = strtonum(buf, 0, LONG_MAX, &errstr);
 	if (errstr != NULL)
 		return;
 	data->pid = ll;
+
+	ll = strtonum(ptr2, 0, UINT_MAX, &errstr);
+	if (errstr != NULL)
+		return;
+	data->idx = ll;
 }
 
 void

cmd-respawn-window.c

@@ -1,4 +1,4 @@
-/* $Id: cmd-respawn-window.c,v 1.13 2009-01-23 16:59:14 nicm Exp $ */
+/* $Id: cmd-respawn-window.c,v 1.14 2009-03-04 17:24:07 nicm Exp $ */
 
 /*
  * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -49,9 +49,8 @@ cmd_respawn_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	struct window		*w;
 	struct window_pane	*wp;
 	struct session		*s;
-	const char		*env[] = CHILD_ENVIRON;
+	const char	       **env;
-	char		 	 buf[256], *cause;
+	char		 	*cause;
-	u_int			 i;
 
 	if ((wl = cmd_find_window(ctx, data->target, &s)) == NULL)
 		return (-1);
@@ -67,10 +66,7 @@ cmd_respawn_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 		}
 	}
 
-	if (session_index(s, &i) != 0)
+	env = server_fill_environ(s);
-		fatalx("session not found");
-	xsnprintf(buf, sizeof buf, "TMUX=%ld,%u", (long) getpid(), i);
-	env[0] = buf;
 
 	wp = TAILQ_FIRST(&w->panes);
 	TAILQ_REMOVE(&w->panes, wp, entry);

cmd-split-window.c

@@ -1,4 +1,4 @@
-/* $Id: cmd-split-window.c,v 1.8 2009-01-23 16:59:14 nicm Exp $ */
+/* $Id: cmd-split-window.c,v 1.9 2009-03-04 17:24:07 nicm Exp $ */
 
 /*
  * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -139,18 +139,15 @@ cmd_split_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	struct winlink			*wl;
 	struct window			*w;
 	struct window_pane		*wp;
-	const char			*env[] = CHILD_ENVIRON;
+	const char		       **env;
-	char		 		 buf[256], *cmd, *cwd, *cause;
+	char		 		*cmd, *cwd, *cause;
-	u_int				 i, hlimit, lines;
+	u_int				 hlimit, lines;
 
 	if ((wl = cmd_find_window(ctx, data->target, &s)) == NULL)
 		return (-1);
 	w = wl->window;
 
-	if (session_index(s, &i) != 0)
+	env = server_fill_environ(s);
-		fatalx("session not found");
-	xsnprintf(buf, sizeof buf, "TMUX=%ld,%u", (long) getpid(), i);
-	env[0] = buf;
 
 	cmd = data->cmd;
 	if (cmd == NULL)

server-fn.c

@@ -1,4 +1,4 @@
-/* $Id: server-fn.c,v 1.55 2009-02-27 16:01:31 nicm Exp $ */
+/* $Id: server-fn.c,v 1.56 2009-03-04 17:24:07 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -26,6 +26,23 @@
 
 int	server_lock_callback(void *, const char *);
 
+const char **
+server_fill_environ(struct session *s)
+{
+	static const char *env[] = { NULL /* TMUX= */, "TERM=screen", NULL };
+	static char	  *tmuxvar[MAXPATHLEN + 256];
+	u_int		   idx;
+
+	if (session_index(s, &idx) != 0)
+		fatalx("session not found");
+
+	xsnprintf(tmuxvar, sizeof tmuxvar,
+	    "TMUX=%s,%ld,%u", socket_path, (long) getpid(), idx);
+	env[0] = tmuxvar;
+
+	return (env);
+}
+
 void
 server_write_client(
     struct client *c, enum hdrtype type, const void *buf, size_t len)

session.c

@@ -1,4 +1,4 @@
-/* $Id: session.c,v 1.52 2009-01-23 16:59:14 nicm Exp $ */
+/* $Id: session.c,v 1.53 2009-03-04 17:24:07 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -200,14 +200,10 @@ session_new(struct session *s,
     const char *name, const char *cmd, const char *cwd, int idx, char **cause)
 {
 	struct window	*w;
-	const char	*env[] = CHILD_ENVIRON;
+	const char     **env;
-	char		 buf[256];
 	u_int		 i, hlimit;
 
-	if (session_index(s, &i) != 0)
+	env = server_fill_environ(s);
-		fatalx("session not found");
-	xsnprintf(buf, sizeof buf, "TMUX=%ld,%u", (long) getpid(), i);
-	env[0] = buf;
 
 	hlimit = options_get_number(&s->options, "history-limit");
 	w = window_create(name, cmd, cwd, env, s->sx, s->sy, hlimit, cause);

tmux.h

@@ -1,4 +1,4 @@
-/* $Id: tmux.h,v 1.276 2009-03-02 18:05:40 nicm Exp $ */
+/* $Id: tmux.h,v 1.277 2009-03-04 17:24:07 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -19,7 +19,7 @@
 #ifndef TMUX_H
 #define TMUX_H
 
-#define PROTOCOL_VERSION -11
+#define PROTOCOL_VERSION -12
 
 /* Shut up gcc warnings about empty if bodies. */
 #define RB_AUGMENT(x) do {} while (0)
@@ -117,9 +117,6 @@ extern const char    *__progname;
 /* Default prompt history length. */
 #define PROMPT_HISTORY 100
 
-/* Default environment. */
-#define CHILD_ENVIRON { NULL /* TMUX= */, "TERM=screen", NULL }
-
 /* Minimum pane size. */
 #define PANE_MINIMUM 4	/* includes separator line */
 
@@ -1313,9 +1310,7 @@ int	 server_start(const char *);
 int	 server_msg_dispatch(struct client *);
 
 /* server-fn.c */
-struct session *server_extract_session(
+const char **server_fill_environ(struct session *);
-    	     struct msg_command_data *, char *, char **);
-void	 server_write(struct client *, enum hdrtype, const void *, size_t);
 void	 server_write_client(
              struct client *, enum hdrtype, const void *, size_t);
 void	 server_write_session(