Add option command-prefix which is automatically prepended to any command

(apart from a naked default-shell). The default is "exec ".

cmd-split-window.c

@@ -58,8 +58,8 @@ cmd_split_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	struct window		*w;
 	struct window_pane	*wp, *new_wp = NULL;
 	struct environ		 env;
-	const char		*cmd, *cwd, *shell;
+	const char		*cmd, *cwd, *shell, *prefix;
-	char			*cause, *new_cause;
+	char			*cause, *new_cause, *cmd1;
 	u_int			 hlimit;
 	int			 size, percentage;
 	enum layout_type	 type;
@@ -121,9 +121,18 @@ cmd_split_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 		goto error;
 	}
 	new_wp = window_add_pane(w, hlimit);
-	if (window_pane_spawn(
+
-	    new_wp, cmd, shell, cwd, &env, s->tio, &cause) != 0)
+	if (*cmd != '\0') {
+		prefix = options_get_string(&w->options, "command-prefix");
+		xasprintf(&cmd1, "%s%s", prefix, cmd);
+	} else
+		cmd1 = xstrdup("");
+	if (window_pane_spawn(new_wp, cmd1, shell, cwd, &env, s->tio,
+	    &cause) != 0) {
+		free(cmd1);
 		goto error;
+	}
+	free(cmd1);
 	layout_assign_pane(lc, new_wp);
 
 	server_redraw_window(w);

names.c

@@ -26,8 +26,8 @@
 
 #include "tmux.h"
 
-void	 window_name_callback(unused int, unused short, void *);
+void	 window_name_callback(int, short, void *);
-char	*parse_window_name(const char *);
+char	*parse_window_name(struct window *, const char *);
 
 void
 queue_window_name(struct window *w)
@@ -73,9 +73,9 @@ window_name_callback(unused int fd, unused short events, void *data)
 		 */
 		if (w->active->cmd != NULL && *w->active->cmd == '\0' &&
 		    name != NULL && name[0] == '-' && name[1] != '\0')
-			wname = parse_window_name(name + 1);
+			wname = parse_window_name(w, name + 1);
 		else
-			wname = parse_window_name(name);
+			wname = parse_window_name(w, name);
 		free(name);
 	}
 
@@ -98,18 +98,22 @@ default_window_name(struct window *w)
 	if (w->active->screen != &w->active->base)
 		return (xstrdup("[tmux]"));
 	if (w->active->cmd != NULL && *w->active->cmd != '\0')
-		return (parse_window_name(w->active->cmd));
+		return (parse_window_name(w, w->active->cmd));
-	return (parse_window_name(w->active->shell));
+	return (parse_window_name(w, w->active->shell));
 }
 
 char *
-parse_window_name(const char *in)
+parse_window_name(struct window *w, const char *in)
 {
-	char	*copy, *name, *ptr;
+	char	*copy, *name, *ptr, *prefix;
+	size_t	 prefixlen;
+
+	prefix = options_get_string(&w->options, "command-prefix");
+	prefixlen = strlen(prefix);
 
 	name = copy = xstrdup(in);
-	if (strncmp(name, "exec ", (sizeof "exec ") - 1) == 0)
+	if (strncmp(name, prefix, prefixlen) == 0)
-		name = name + (sizeof "exec ") - 1;
+		name = name + prefixlen;
 
 	while (*name == ' ')
 		name++;

options-table.c

@@ -476,7 +476,6 @@ const struct options_table_entry window_options_table[] = {
 	  .default_num = 1
 	},
 
-
 	{ .name = "c0-change-trigger",
 	  .type = OPTIONS_TABLE_NUMBER,
 	  .default_num = 250,
@@ -502,6 +501,11 @@ const struct options_table_entry window_options_table[] = {
 	  .default_num = 1
 	},
 
+	{ .name = "command-prefix",
+	  .type = OPTIONS_TABLE_STRING,
+	  .default_str = "exec "
+	},
+
 	{ .name = "force-height",
 	  .type = OPTIONS_TABLE_NUMBER,
 	  .minimum = 0,

tmux.1

@@ -2708,6 +2708,13 @@ Set clock colour.
 .Xc
 Set clock hour format.
 .Pp
+.It Ic command-prefix Ar string
+String prefixed to commands (apart from a plain shell as set by the
+.Ic default-shell
+option).
+The default is
+.Ql "exec\ " .
+.Pp
 .It Ic force-height Ar height
 .It Ic force-width Ar width
 Prevent

window.c

@@ -311,20 +311,32 @@ window_create(const char *name, const char *cmd, const char *shell,
 {
 	struct window		*w;
 	struct window_pane	*wp;
+	const char		*prefix;
+	char			*cmd1;
 
 	w = window_create1(sx, sy);
 	wp = window_add_pane(w, hlimit);
 	layout_init(w);
-	if (window_pane_spawn(wp, cmd, shell, cwd, env, tio, cause) != 0) {
+
+	if (*cmd != '\0') {
+		prefix = options_get_string(&w->options, "command-prefix");
+		xasprintf(&cmd1, "%s%s", prefix, cmd);
+	} else
+		cmd1 = xstrdup("");
+	if (window_pane_spawn(wp, cmd1, shell, cwd, env, tio, cause) != 0) {
 		window_destroy(w);
+		free(cmd1);
 		return (NULL);
 	}
+	free(cmd1);
+
 	w->active = TAILQ_FIRST(&w->panes);
 	if (name != NULL) {
 		w->name = xstrdup(name);
 		options_set_number(&w->options, "automatic-rename", 0);
 	} else
 		w->name = default_window_name(w);
+
 	return (w);
 }
 
@@ -701,6 +713,8 @@ window_pane_spawn(struct window_pane *wp, const char *cmd, const char *shell,
 		wp->cwd = xstrdup(cwd);
 	}
 
+	log_debug("spawn: %s -- %s", wp->shell, wp->cmd);
+
 	memset(&ws, 0, sizeof ws);
 	ws.ws_col = screen_size_x(&wp->base);
 	ws.ws_row = screen_size_y(&wp->base);