Add 'e' key in buffer mode to open the buffer in an editor.

cmd-display-menu.c

@@ -313,7 +313,7 @@ cmd_display_popup_exec(struct cmd *self, struct cmdq_item *item)
 	else if (args_has(args, 'E'))
 		flags |= POPUP_CLOSEEXIT;
 	if (popup_display(flags, item, px, py, w, h, nlines, lines, shellcmd,
-	    cmd, cwd, tc, target) != 0)
+	    cmd, cwd, tc, target, NULL, NULL) != 0)
 		return (CMD_RETURN_NORMAL);
 	return (CMD_RETURN_WAIT);
 }

format-draw.c

@@ -738,7 +738,7 @@ format_draw(struct screen_write_ctx *octx, const struct grid_cell *base,
 
 	/*
 	 * Draw the screens. How they are arranged depends on where the list
-	 * appearsq.
+	 * appears.
 	 */
 	switch (list_align) {
 	case STYLE_ALIGN_DEFAULT:

job.c

@@ -19,6 +19,7 @@
 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
+#include <sys/wait.h>
 
 #include <fcntl.h>
 #include <paths.h>
@@ -285,6 +286,12 @@ job_check_died(pid_t pid, int status)
 	}
 	if (job == NULL)
 		return;
+	if (WIFSTOPPED(status)) {
+		if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
+			return;
+		killpg(job->pid, SIGCONT);
+		return;
+	}
 	log_debug("job died %p: %s, pid %ld", job, job->cmd, (long) job->pid);
 
 	job->status = status;

options-table.c

@@ -210,6 +210,12 @@ const struct options_table_entry options_table[] = {
 	  .default_str = "screen"
 	},
 
+	{ .name = "editor",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .default_str = _PATH_VI
+	},
+
 	{ .name = "escape-time",
 	  .type = OPTIONS_TABLE_NUMBER,
 	  .scope = OPTIONS_TABLE_SERVER,

paste.c

@@ -297,6 +297,15 @@ paste_set(char *data, size_t size, const char *name, char **cause)
 	return (0);
 }
 
+/* Set paste data without otherwise changing it. */
+void
+paste_replace(struct paste_buffer *pb, char *data, size_t size)
+{
+	free(pb->data);
+	pb->data = data;
+	pb->size = size;
+}
+
 /* Convert start of buffer into a nice string. */
 char *
 paste_make_sample(struct paste_buffer *pb)

popup.c

@@ -40,6 +40,8 @@ struct popup_data {
 	struct job		 *job;
 	struct input_ctx	 *ictx;
 	int			  status;
+	popup_close_cb		  cb;
+	void			 *arg;
 
 	u_int			  px;
 	u_int			  py;
@@ -150,6 +152,9 @@ popup_free_cb(struct client *c)
 	struct cmdq_item	*item = pd->item;
 	u_int			 i;
 
+	if (pd->cb != NULL)
+		pd->cb(pd->status, pd->arg);
+
 	if (item != NULL) {
 		if (pd->ictx != NULL &&
 		    cmdq_get_client(item) != NULL &&
@@ -403,7 +408,7 @@ int
 popup_display(int flags, struct cmdq_item *item, u_int px, u_int py, u_int sx,
     u_int sy, u_int nlines, const char **lines, const char *shellcmd,
     const char *cmd, const char *cwd, struct client *c,
-    struct cmd_find_state *fs)
+    struct cmd_find_state *fs, popup_close_cb cb, void *arg)
 {
 	struct popup_data	*pd;
 	u_int			 i;
@@ -422,6 +427,8 @@ popup_display(int flags, struct cmdq_item *item, u_int px, u_int py, u_int sx,
 	pd->c = c;
 	pd->c->references++;
 
+	pd->cb = cb;
+	pd->arg = arg;
 	pd->status = 128 + SIGHUP;
 
 	if (fs != NULL)

server.c

@@ -481,4 +481,5 @@ server_child_stopped(pid_t pid, int status)
 			}
 		}
 	}
+	job_check_died(pid, status);
 }

tmux.1

@@ -3113,6 +3113,10 @@ Set the time in milliseconds for which
 waits after an escape is input to determine if it is part of a function or meta
 key sequences.
 The default is 500 milliseconds.
+.It Ic editor Ar shell-command
+Set the command used when
+.Nm
+runs an editor.
 .It Xo Ic exit-empty
 .Op Ic on | off
 .Xc
@@ -5339,6 +5343,7 @@ The following keys may be used in buffer mode:
 .It Li "P" Ta "Paste tagged buffers"
 .It Li "d" Ta "Delete selected buffer"
 .It Li "D" Ta "Delete tagged buffers"
+.It Li "e" Ta "Open the buffer in an editor"
 .It Li "f" Ta "Enter a format to filter items"
 .It Li "O" Ta "Change sort field"
 .It Li "r" Ta "Reverse sort order"

tmux.c

@@ -443,6 +443,7 @@ main(int argc, char **argv)
 
 	/* Override keys to vi if VISUAL or EDITOR are set. */
 	if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
+		options_set_string(global_options, "editor", 0, "%s", s);
 		if (strrchr(s, '/') != NULL)
 			s = strrchr(s, '/') + 1;
 		if (strstr(s, "vi") != NULL)

tmux.h

@@ -1806,6 +1806,7 @@ void		 paste_free(struct paste_buffer *);
 void		 paste_add(const char *, char *, size_t);
 int		 paste_rename(const char *, const char *, char **);
 int		 paste_set(char *, size_t, const char *, char **);
+void		 paste_replace(struct paste_buffer *, char *, size_t);
 char		*paste_make_sample(struct paste_buffer *);
 
 /* format.c */
@@ -2813,12 +2814,14 @@ int		 menu_display(struct menu *, int, struct cmdq_item *, u_int,
 #define POPUP_WRITEKEYS 0x1
 #define POPUP_CLOSEEXIT 0x2
 #define POPUP_CLOSEEXITZERO 0x4
+typedef void (*popup_close_cb)(int, void *);
 u_int		 popup_width(struct cmdq_item *, u_int, const char **,
 		    struct client *, struct cmd_find_state *);
 u_int		 popup_height(u_int, const char **);
 int		 popup_display(int, struct cmdq_item *, u_int, u_int, u_int,
 		    u_int, u_int, const char **, const char *, const char *,
-		    const char *, struct client *, struct cmd_find_state *);
+		    const char *, struct client *, struct cmd_find_state *,
+		    popup_close_cb, void *);
 
 /* style.c */
 int		 style_parse(struct style *,const struct grid_cell *,

window-buffer.c

@@ -18,9 +18,12 @@
 
 #include <sys/types.h>
 
+#include <paths.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
+#include <unistd.h>
 #include <vis.h>
 
 #include "tmux.h"
@@ -95,6 +98,13 @@ struct window_buffer_modedata {
 	u_int				  item_size;
 };
 
+struct window_buffer_editdata {
+	u_int			 wp_id;
+	char			*path;
+	char			*name;
+	struct paste_buffer	*pb;
+};
+
 static struct window_buffer_itemdata *
 window_buffer_add_item(struct window_buffer_modedata *data)
 {
@@ -353,6 +363,126 @@ window_buffer_do_paste(void *modedata, void *itemdata, struct client *c,
 		mode_tree_run_command(c, NULL, data->command, item->name);
 }
 
+static void
+window_buffer_finish_edit(struct window_buffer_editdata *ed)
+{
+	unlink(ed->path);
+	free(ed->path);
+	free(ed->name);
+	free(ed);
+}
+
+static void
+window_buffer_edit_close_cb(int status, void *arg)
+{
+	struct window_buffer_editdata	*ed = arg;
+	FILE				*f;
+	off_t				 len;
+	char				*buf;
+	size_t				 oldlen;
+	const char			*oldbuf;
+	struct paste_buffer		*pb;
+	struct window_pane		*wp;
+	struct window_buffer_modedata	*data;
+	struct window_mode_entry	*wme;
+
+	if (status != 0) {
+		window_buffer_finish_edit(ed);
+		return;
+	}
+
+	pb = paste_get_name(ed->name);
+	if (pb == NULL || pb != ed->pb) {
+		window_buffer_finish_edit(ed);
+		return;
+	}
+
+	f = fopen(ed->path, "r");
+	if (f != NULL) {
+		fseeko(f, 0, SEEK_END);
+		len = ftello(f);
+		fseeko(f, 0, SEEK_SET);
+
+		if (len > 0 &&
+		    (uintmax_t)len <= (uintmax_t)SIZE_MAX &&
+		    (buf = malloc(len)) != NULL &&
+		    fread(buf, len, 1, f) == 1) {
+			oldbuf = paste_buffer_data(pb, &oldlen);
+			if (oldlen != '\0' &&
+			    oldbuf[oldlen - 1] != '\n' &&
+			    buf[len - 1] == '\n')
+				len--;
+			if (len != 0)
+				paste_replace(pb, buf, len);
+		}
+		fclose(f);
+	}
+
+	wp = window_pane_find_by_id(ed->wp_id);
+	if (wp != NULL) {
+		wme = TAILQ_FIRST(&wp->modes);
+		if (wme->mode == &window_buffer_mode) {
+			data = wme->data;
+			mode_tree_build(data->data);
+			mode_tree_draw(data->data);
+		}
+		wp->flags |= PANE_REDRAW;
+	}
+	window_buffer_finish_edit(ed);
+}
+
+static void
+window_buffer_start_edit(struct window_buffer_modedata *data,
+    struct window_buffer_itemdata *item, struct client *c)
+{
+	struct paste_buffer		*pb;
+	int				 fd;
+	FILE				*f;
+	const char			*buf;
+	size_t				 len;
+	struct window_buffer_editdata	*ed;
+	char				*cmd;
+	char				 path[] = _PATH_TMP "tmux.XXXXXXXX";
+	const char			*editor;
+	u_int				 px, py, sx, sy;
+
+	if ((pb = paste_get_name(item->name)) == NULL)
+		return;
+	buf = paste_buffer_data(pb, &len);
+
+	editor = options_get_string(global_options, "editor");
+	if (*editor == '\0')
+		return;
+
+	fd = mkstemp(path);
+	if (fd == -1)
+		return;
+	f = fdopen(fd, "w");
+	if (fwrite(buf, len, 1, f) != 1) {
+		fclose(f);
+		return;
+	}
+	fclose(f);
+
+	ed = xcalloc(1, sizeof *ed);
+	ed->wp_id = data->wp->id;
+	ed->path = xstrdup(path);
+	ed->name = xstrdup(paste_buffer_name(pb));
+	ed->pb = pb;
+
+	sx = c->tty.sx * 9 / 10;
+	sy = c->tty.sy * 9 / 10;
+	px = (c->tty.sx / 2) - (sx / 2);
+	py = (c->tty.sy / 2) - (sy / 2);
+
+	xasprintf(&cmd, "%s %s", editor, path);
+	if (popup_display(POPUP_WRITEKEYS|POPUP_CLOSEEXIT, NULL, px, py, sx, sy,
+	    0, NULL, cmd, NULL, _PATH_TMP, c, NULL, window_buffer_edit_close_cb,
+	    ed) != 0)
+		window_buffer_finish_edit(ed);
+	free(cmd);
+}
+
 static void
 window_buffer_key(struct window_mode_entry *wme, struct client *c,
     __unused struct session *s, __unused struct winlink *wl, key_code key,
@@ -366,6 +496,10 @@ window_buffer_key(struct window_mode_entry *wme, struct client *c,
 
 	finished = mode_tree_key(mtd, c, &key, m, NULL, NULL);
 	switch (key) {
+	case 'e':
+		item = mode_tree_get_current(mtd);
+		window_buffer_start_edit(data, item, c);
+		break;
 	case 'd':
 		item = mode_tree_get_current(mtd);
 		window_buffer_do_delete(data, item, c, key);