Store the current working directory in the session, change the default-path

option to default to empty and make that mean that the stored session CWD is
used.

cmd-new-session.c

@@ -18,8 +18,10 @@
 
 #include <sys/types.h>
 
+#include <pwd.h>
 #include <string.h>
 #include <termios.h>
+#include <unistd.h>
 
 #include "tmux.h"
 
@@ -125,8 +127,9 @@ cmd_new_session_exec(struct cmd *self, struct cmd_ctx *ctx)
 	struct window_pane		*wp;
 	struct environ			 env;
 	struct termios			 tio, *tiop;
-	const char			*update;
-	char				*overrides, *cmd, *cwd, *cause;
+	struct passwd			*pw;
+	const char			*update, *cwd;
+	char				*overrides, *cmd, *cause;
 	int				 detached, idx;
 	u_int				 sx, sy, i;
 
@@ -198,8 +201,13 @@ cmd_new_session_exec(struct cmd *self, struct cmd_ctx *ctx)
 	/* Get the new session working directory. */
 	if (ctx->cmdclient != NULL && ctx->cmdclient->cwd != NULL)
 		cwd = ctx->cmdclient->cwd;
-	else
-		cwd = options_get_string(&global_s_options, "default-path");
+	else {
+		pw = getpwuid(getuid());
+		if (pw->pw_dir != NULL && *pw->pw_dir != '\0')
+			cwd = pw->pw_dir;
+		else
+			cwd = "/";
+	}
 
 	/* Find new session size. */
 	if (detached) {

cmd-new-window.c

@@ -176,10 +176,13 @@ cmd_new_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	cmd = data->cmd;
 	if (cmd == NULL)
 		cmd = options_get_string(&s->options, "default-command");
-	if (ctx->cmdclient == NULL || ctx->cmdclient->cwd == NULL)
-		cwd = options_get_string(&s->options, "default-path");
-	else
-		cwd = ctx->cmdclient->cwd;
+	cwd = options_get_string(&s->options, "default-path");
+	if (*cwd == '\0') {
+		if (ctx->cmdclient != NULL && ctx->cmdclient->cwd != NULL)
+			cwd = ctx->cmdclient->cwd;
+		else
+			cwd = s->cwd;
+	}
 
 	if (idx == -1)
 		idx = -1 - options_get_number(&s->options, "base-index");

cmd-split-window.c

@@ -170,10 +170,13 @@ cmd_split_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	cmd = data->cmd;
 	if (cmd == NULL)
 		cmd = options_get_string(&s->options, "default-command");
-	if (ctx->cmdclient == NULL || ctx->cmdclient->cwd == NULL)
-		cwd = options_get_string(&s->options, "default-path");
-	else
-		cwd = ctx->cmdclient->cwd;
+	cwd = options_get_string(&s->options, "default-path");
+	if (*cwd == '\0') {
+		if (ctx->cmdclient != NULL && ctx->cmdclient->cwd != NULL)
+			cwd = ctx->cmdclient->cwd;
+		else
+			cwd = s->cwd;
+	}
 
 	type = LAYOUT_TOPBOTTOM;
 	if (data->flag_horizontal)

session.c

@@ -68,6 +68,8 @@ session_create(const char *name, const char *cmd, const char *cwd,
 		fatal("gettimeofday failed");
 	memcpy(&s->activity_time, &s->creation_time, sizeof s->activity_time);
 
+	s->cwd = xstrdup(cwd);
+
 	s->curw = NULL;
 	TAILQ_INIT(&s->lastw);
 	RB_INIT(&s->windows);
@@ -142,6 +144,7 @@ session_destroy(struct session *s)
 	while (!RB_EMPTY(&s->windows))
 		winlink_remove(&s->windows, RB_ROOT(&s->windows));
 
+	xfree(s->cwd);
 	xfree(s->name);
 
 	for (i = 0; i < ARRAY_LENGTH(&dead_sessions); i++) {

tmux.1

@@ -1626,7 +1626,8 @@ is used as a login shell.
 .It Ic default-path Ar path
 Set the default working directory for processes created from keys, or
 interactively from the prompt.
-The default is the current working directory when the server is started.
+The default is empty, which means to use the working directory of the shell
+from which the server was started if it is available or the user's home if not.
 .It Ic default-terminal Ar terminal
 Set the default terminal for new windows created in this session - the
 default value of the

tmux.c

@@ -239,7 +239,7 @@ main(int argc, char **argv)
 	struct env_data		 envdata;
 	struct msg_command_data	 cmddata;
 	char			*s, *shellcmd, *path, *label, *home, *cause;
-	char			 cwd[MAXPATHLEN], **var;
+	char		       **var;
 	void			*buf;
 	size_t			 len;
 	int	 		 opt, flags, quiet = 0, cmdflags = 0;
@@ -339,6 +339,7 @@ main(int argc, char **argv)
 	options_set_number(so, "bell-action", BELL_ANY);
 	options_set_number(so, "buffer-limit", 9);
 	options_set_string(so, "default-command", "%s", "");
+	options_set_string(so, "default-path", "%s", "");
 	options_set_string(so, "default-shell", "%s", getshell());
 	options_set_string(so, "default-terminal", "screen");
 	options_set_number(so, "detach-on-destroy", 1);
@@ -435,15 +436,6 @@ main(int argc, char **argv)
 		options_set_number(wo, "utf8", 0);
 	}
 
-	if (getcwd(cwd, sizeof cwd) == NULL) {
-		pw = getpwuid(getuid());
-		if (pw->pw_dir != NULL && *pw->pw_dir != '\0')
-			strlcpy(cwd, pw->pw_dir, sizeof cwd);
-		else
-			strlcpy(cwd, "/", sizeof cwd);
-	}
-	options_set_string(so, "default-path", "%s", cwd);
-
 	if (cfg_file == NULL) {
 		home = getenv("HOME");
 		if (home == NULL || *home == '\0') {

tmux.h

@@ -926,6 +926,7 @@ TAILQ_HEAD(session_groups, session_group);
 
 struct session {
 	char		*name;
+	char		*cwd;
 
 	struct timeval	 creation_time;
 	struct timeval	 activity_time;