From: NeilBrown <neil@brown.name>
Date: Thu, 10 Dec 2015 06:00:28 +0000 (+1100)
Subject: Add infrastructure to allow panes to get notifications from other panes.
X-Git-Tag: lca2016~70
X-Git-Url: http://git.neil.brown.name/?a=commitdiff_plain;h=0f40bcce783354a927ae28193a42d73722d20389;p=edlib.git

Add infrastructure to allow panes to get notifications from other panes.

Signed-off-by: NeilBrown <neil@brown.name>
---

diff --git a/core-pane.c b/core-pane.c
index a6df9507..9c762dcd 100644
--- a/core-pane.c
+++ b/core-pane.c
@@ -43,6 +43,8 @@ void pane_init(struct pane *p, struct pane *par, struct list_head *here)
 	else
 		INIT_LIST_HEAD(&p->siblings);
 	INIT_LIST_HEAD(&p->children);
+	INIT_LIST_HEAD(&p->notifiers);
+	INIT_LIST_HEAD(&p->notifiees);
 	p->x = p->y = p->z = 0;
 	p->cx = p->cy = -1;
 	p->h = p->w = 0;
@@ -155,6 +157,45 @@ void pane_refresh(struct pane *p)
 	__pane_refresh(&ci);
 }
 
+void pane_add_notify(struct pane *target, struct pane *source, char *msg)
+{
+	struct notifier *n = malloc(sizeof(*n));
+
+	n->notifiee = target;
+	n->notification = strdup(msg);
+	list_add(&n->notifier_link, &source->notifiees);
+	list_add(&n->notifiee_link, &target->notifiers);
+}
+
+static void pane_drop_notifiers(struct pane *p)
+{
+	while (!list_empty(&p->notifiers)) {
+		struct notifier *n = list_first_entry(&p->notifiers,
+						      struct notifier,
+						      notifiee_link);
+		list_del_init(&n->notifiee_link);
+		list_del_init(&n->notifier_link);
+		free(n->notification);
+		free(n);
+	}
+}
+
+static void pane_notify_close(struct pane *p)
+{
+	while (!list_empty(&p->notifiees)) {
+		struct notifier *n = list_first_entry(&p->notifiers,
+						      struct notifier,
+						      notifiee_link);
+		list_del_init(&n->notifiee_link);
+		list_del_init(&n->notifier_link);
+		if (strcmp(n->notification, "Notify:Close") == 0)
+			comm_call_pane(n->notifiee, n->notification, p,
+				       0, NULL, NULL, 0);
+		free(n->notification);
+		free(n);
+	}
+}
+
 void pane_close(struct pane *p)
 {
 	struct pane *c;
@@ -169,6 +210,8 @@ void pane_close(struct pane *p)
 		p->parent->focus = NULL;
 	}
 	list_del_init(&p->siblings);
+	pane_drop_notifiers(p);
+	pane_notify_close(p);
 	if (p->handle) {
 		struct cmd_info ci = {0};
 
diff --git a/core.h b/core.h
index 4e3c8ce4..393343c6 100644
--- a/core.h
+++ b/core.h
@@ -55,12 +55,20 @@ struct pane {
 	void			*data;
 	struct mark		*pointer;
 	struct attrset		*attrs;
+	struct list_head	notifiers, notifiees;
 };
 
 struct command {
 	int	(*func)(const struct cmd_info *ci);
 };
 
+struct notifier {
+	struct pane		*notifiee;
+	char			*notification;
+	struct list_head	notifier_link, notifiee_link;
+};
+void pane_add_notify(struct pane *target, struct pane *source, char *msg);
+
 /* this is ->data for a document pane.  Only core-doc and
  * individual document handlers can know about this.
  */
@@ -548,6 +556,25 @@ static inline int comm_call(struct command *comm, char *key, struct pane *focus,
 	return comm->func(&ci);
 }
 
+static inline int comm_call_pane(struct pane *home, char *key, struct pane *focus,
+				 int numeric, struct mark *m, char *str, int extra)
+{
+	struct cmd_info ci = {0};
+	struct command *comm = home->handle;
+
+	if (!comm)
+		return -1;
+	ci.home = home;
+	ci.key = key;
+	ci.focus = focus;
+	ci.numeric = numeric;
+	ci.mark = m;
+	ci.str = str;
+	ci.extra = extra;
+	ci.comm = comm;
+	return comm->func(&ci);
+}
+
 static inline int comm_call7(struct command *comm, char *key,
 			     struct pane *focus,
 			     int numeric, struct mark *m, char *str,