Import tmux, a terminal multiplexor allowing (among other things) a single

terminal to be switched between several different windows and programs
displayed on one terminal be detached from one terminal and moved to another.

ok deraadt pirofti

1 files changed, 378 insertions, 0 deletions

diff --git a/session.c b/session.c
new file mode 100644
index 00000000..3b65127c
--- /dev/null
+++ b/session.c
@@ -0,0 +1,378 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/time.h>
+
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "tmux.h"
+
+/* Global session list. */
+struct sessions	sessions;
+
+struct winlink *session_next_activity(struct session *, struct winlink *);
+struct winlink *session_previous_activity(struct session *, struct winlink *);
+
+void
+session_alert_cancel(struct session *s, struct winlink *wl)
+{
+	struct session_alert	*sa, *sb;
+
+	sa = SLIST_FIRST(&s->alerts);
+	while (sa != NULL) {
+		sb = sa;
+		sa = SLIST_NEXT(sa, entry);
+
+		if (wl == NULL || sb->wl == wl) {
+			SLIST_REMOVE(&s->alerts, sb, session_alert, entry);
+			xfree(sb);
+		}
+	}
+}
+
+void
+session_alert_add(struct session *s, struct window *w, int type)
+{
+	struct session_alert	*sa;
+	struct winlink		*wl;
+
+	RB_FOREACH(wl, winlinks, &s->windows) {
+		if (wl == s->curw)
+			continue;
+
+		if (wl->window == w &&
+		    !session_alert_has(s, wl, type)) {
+			sa = xmalloc(sizeof *sa);
+			sa->wl = wl;
+			sa->type = type;
+			SLIST_INSERT_HEAD(&s->alerts, sa, entry);
+		}
+	}
+}
+
+int
+session_alert_has(struct session *s, struct winlink *wl, int type)
+{
+	struct session_alert	*sa;
+
+	SLIST_FOREACH(sa, &s->alerts, entry) {
+		if (sa->wl == wl && sa->type == type)
+			return (1);
+	}
+
+	return (0);
+}
+
+int
+session_alert_has_window(struct session *s, struct window *w, int type)
+{
+	struct session_alert	*sa;
+
+	SLIST_FOREACH(sa, &s->alerts, entry) {
+		if (sa->wl->window == w && sa->type == type)
+			return (1);
+	}
+
+	return (0);
+}
+
+/* Find session by name. */
+struct session *
+session_find(const char *name)
+{
+	struct session	*s;
+	u_int		 i;
+
+	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
+		s = ARRAY_ITEM(&sessions, i);
+		if (s != NULL && strcmp(s->name, name) == 0)
+			return (s);
+	}
+
+	return (NULL);
+}
+
+/* Create a new session. */
+struct session *
+session_create(const char *name,
+    const char *cmd, const char *cwd, u_int sx, u_int sy, char **cause)
+{
+	struct session	*s;
+	u_int		 i;
+
+	s = xmalloc(sizeof *s);
+	s->flags = 0;
+	if (gettimeofday(&s->tv, NULL) != 0)
+		fatal("gettimeofday");
+	s->curw = NULL;
+	SLIST_INIT(&s->lastw);
+	RB_INIT(&s->windows);
+	SLIST_INIT(&s->alerts);
+	paste_init_stack(&s->buffers);
+	options_init(&s->options, &global_options);
+
+	s->sx = sx;
+	s->sy = sy;
+
+	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
+		if (ARRAY_ITEM(&sessions, i) == NULL) {
+			ARRAY_SET(&sessions, i, s);
+			break;
+		}
+	}
+	if (i == ARRAY_LENGTH(&sessions))
+		ARRAY_ADD(&sessions, s);
+
+	if (name != NULL)
+		s->name = xstrdup(name);
+	else
+		xasprintf(&s->name, "%u", i);
+	if (session_new(s, NULL, cmd, cwd, -1, cause) == NULL) {
+		session_destroy(s);
+		return (NULL);
+	}
+	session_select(s, 0);
+
+	log_debug("session %s created", s->name);
+
+	return (s);
+}
+
+/* Destroy a session. */
+void
+session_destroy(struct session *s)
+{
+	u_int	i;
+
+	log_debug("session %s destroyed", s->name);
+
+	if (session_index(s, &i) != 0)
+		fatalx("session not found");
+	ARRAY_SET(&sessions, i, NULL);
+	while (!ARRAY_EMPTY(&sessions) && ARRAY_LAST(&sessions) == NULL)
+		ARRAY_TRUNC(&sessions, 1);
+
+	session_alert_cancel(s, NULL);
+	options_free(&s->options);
+	paste_free_stack(&s->buffers);
+
+	while (!SLIST_EMPTY(&s->lastw))
+		winlink_stack_remove(&s->lastw, SLIST_FIRST(&s->lastw));
+	while (!RB_EMPTY(&s->windows))
+		winlink_remove(&s->windows, RB_ROOT(&s->windows));
+
+	xfree(s->name);
+	xfree(s);
+}
+
+/* Find session index. */
+int
+session_index(struct session *s, u_int *i)
+{
+	for (*i = 0; *i < ARRAY_LENGTH(&sessions); (*i)++) {
+		if (s == ARRAY_ITEM(&sessions, *i))
+			return (0);
+	}
+	return (-1);
+}
+
+/* Create a new window on a session. */
+struct winlink *
+session_new(struct session *s,
+    const char *name, const char *cmd, const char *cwd, int idx, char **cause)
+{
+	struct window	*w;
+	const char     **env;
+	u_int		 hlimit;
+
+	env = server_fill_environ(s);
+
+	hlimit = options_get_number(&s->options, "history-limit");
+	w = window_create(name, cmd, cwd, env, s->sx, s->sy, hlimit, cause);
+	if (w == NULL)
+		return (NULL);
+
+	if (options_get_number(&s->options, "set-remain-on-exit"))
+		options_set_number(&w->options, "remain-on-exit", 1);
+
+	return (session_attach(s, w, idx, cause));
+}
+
+/* Attach a window to a session. */
+struct winlink *
+session_attach(struct session *s, struct window *w, int idx, char **cause)
+{
+	struct winlink	*wl;
+
+	if ((wl = winlink_add(&s->windows, w, idx)) == NULL)
+		xasprintf(cause, "index in use: %d", idx);
+	return (wl);
+}
+
+/* Detach a window from a session. */
+int
+session_detach(struct session *s, struct winlink *wl)
+{
+	if (s->curw == wl &&
+	    session_last(s) != 0 && session_previous(s, 0) != 0)
+		session_next(s, 0);
+
+	session_alert_cancel(s, wl);
+	winlink_stack_remove(&s->lastw, wl);
+	winlink_remove(&s->windows, wl);
+	if (RB_EMPTY(&s->windows)) {
+		session_destroy(s);
+		return (1);
+	}
+	return (0);
+}
+
+/* Return if session has window. */
+int
+session_has(struct session *s, struct window *w)
+{
+	struct winlink	*wl;
+
+	RB_FOREACH(wl, winlinks, &s->windows) {
+		if (wl->window == w)
+			return (1);
+	}
+	return (0);
+}
+
+struct winlink *
+session_next_activity(struct session *s, struct winlink *wl)
+{
+	while (wl != NULL) {
+		if (session_alert_has(s, wl, WINDOW_BELL))
+			break;
+		if (session_alert_has(s, wl, WINDOW_ACTIVITY))
+			break;
+		if (session_alert_has(s, wl, WINDOW_CONTENT))
+			break;
+		wl = winlink_next(&s->windows, wl);
+	}
+	return (wl);
+}
+
+/* Move session to next window. */
+int
+session_next(struct session *s, int activity)
+{
+	struct winlink	*wl;
+
+	if (s->curw == NULL)
+		return (-1);
+
+	wl = winlink_next(&s->windows, s->curw);
+	if (activity)
+		wl = session_next_activity(s, wl);
+	if (wl == NULL) {
+		wl = RB_MIN(winlinks, &s->windows);
+		if (activity && ((wl = session_next_activity(s, wl)) == NULL))
+			return (-1);
+	}
+	if (wl == s->curw)
+		return (1);
+	winlink_stack_remove(&s->lastw, wl);
+	winlink_stack_push(&s->lastw, s->curw);
+	s->curw = wl;
+	session_alert_cancel(s, wl);
+	return (0);
+}
+
+struct winlink *
+session_previous_activity(struct session *s, struct winlink *wl)
+{
+	while (wl != NULL) {
+		if (session_alert_has(s, wl, WINDOW_BELL))
+			break;
+		if (session_alert_has(s, wl, WINDOW_ACTIVITY))
+			break;
+		if (session_alert_has(s, wl, WINDOW_CONTENT))
+			break;
+		wl = winlink_previous(&s->windows, wl);
+	}
+	return (wl);
+}
+
+/* Move session to previous window. */
+int
+session_previous(struct session *s, int activity)
+{
+	struct winlink	*wl;
+
+	if (s->curw == NULL)
+		return (-1);
+
+	wl = winlink_previous(&s->windows, s->curw);
+	if (activity)
+		wl = session_previous_activity(s, wl);
+	if (wl == NULL) {
+		wl = RB_MAX(winlinks, &s->windows);
+		if (activity && (wl = session_previous_activity(s, wl)) == NULL)
+			return (-1);
+	}
+	if (wl == s->curw)
+		return (1);
+	winlink_stack_remove(&s->lastw, wl);
+	winlink_stack_push(&s->lastw, s->curw);
+	s->curw = wl;
+	session_alert_cancel(s, wl);
+	return (0);
+}
+
+/* Move session to specific window. */
+int
+session_select(struct session *s, int idx)
+{
+	struct winlink	*wl;
+
+	wl = winlink_find_by_index(&s->windows, idx);
+	if (wl == NULL)
+		return (-1);
+	if (wl == s->curw)
+		return (1);
+	winlink_stack_remove(&s->lastw, wl);
+	winlink_stack_push(&s->lastw, s->curw);
+	s->curw = wl;
+	session_alert_cancel(s, wl);
+	return (0);
+}
+
+/* Move session to last used window. */
+int
+session_last(struct session *s)
+{
+	struct winlink	*wl;
+
+	wl = SLIST_FIRST(&s->lastw);
+	if (wl == NULL)
+		return (-1);
+	if (wl == s->curw)
+		return (1);
+
+	winlink_stack_remove(&s->lastw, wl);
+	winlink_stack_push(&s->lastw, s->curw);
+	s->curw = wl;
+	session_alert_cancel(s, wl);
+	return (0);
+}