From 8ac024bd9aebfe73a44069aae5ddd4499e9e1713 Mon Sep 17 00:00:00 2001
From: Nikita Ivanov <nikita.vyach.ivanov@gmail.com>
Date: Sun, 9 Feb 2025 23:12:09 +0100
Subject: [PATCH] setrule: add/change rules at runtime

---
 config.def.h |  9 ++++++++-
 dwl.c        | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 64 insertions(+), 2 deletions(-)

diff --git a/config.def.h b/config.def.h
index 22d2171..666a8c3 100644
--- a/config.def.h
+++ b/config.def.h
@@ -20,14 +20,20 @@ static const float fullscreen_bg[]         = {0.1f, 0.1f, 0.1f, 1.0f}; /* You ca
 /* logging */
 static int log_level = WLR_ERROR;
 
+/* Max amount of rules */
+#define RULES_MAX 100
+
 /* NOTE: ALWAYS keep a rule declared even if you don't use rules (e.g leave at least one example) */
-static const Rule rules[] = {
+static Rule rules[RULES_MAX] = {
 	/* app_id             title       tags mask     isfloating   monitor */
 	/* examples: */
 	{ "Gimp_EXAMPLE",     NULL,       0,            1,           -1 }, /* Start on currently visible tags floating, not tiled */
 	{ "firefox_EXAMPLE",  NULL,       1 << 8,       0,           -1 }, /* Start on ONLY tag "9" */
 };
 
+static const Rule rule_default =
+	{ NULL,               NULL,       0,            0,           -1 };
+
 /* layout(s) */
 static const Layout layouts[] = {
 	/* symbol     arrange function */
@@ -142,6 +148,7 @@ static const Key keys[] = {
 	{ MODKEY,                    XKB_KEY_space,      setlayout,      {0} },
 	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_space,      togglefloating, {0} },
 	{ MODKEY,                    XKB_KEY_e,         togglefullscreen, {0} },
+	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_R,          setruleisfloating,{0} },
 	{ MODKEY,                    XKB_KEY_0,          view,           {.ui = ~0} },
 	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_parenright, tag,            {.ui = ~0} },
 	{ MODKEY,                    XKB_KEY_comma,      focusmon,       {.i = WLR_DIRECTION_LEFT} },
diff --git a/dwl.c b/dwl.c
index def2562..82929ca 100644
--- a/dwl.c
+++ b/dwl.c
@@ -290,6 +290,7 @@ static void focusmon(const Arg *arg);
 static void focusstack(const Arg *arg);
 static Client *focustop(Monitor *m);
 static void fullscreennotify(struct wl_listener *listener, void *data);
+static Rule *getrule(Client *c);
 static void gpureset(struct wl_listener *listener, void *data);
 static void handlesig(int signo);
 static void incnmaster(const Arg *arg);
@@ -331,6 +332,7 @@ static void setlayout(const Arg *arg);
 static void setmfact(const Arg *arg);
 static void setmon(Client *c, Monitor *m, uint32_t newtags);
 static void setpsel(struct wl_listener *listener, void *data);
+static void setruleisfloating(const Arg *arg);
 static void setsel(struct wl_listener *listener, void *data);
 static void setup(void);
 static void spawn(const Arg *arg);
@@ -466,7 +468,7 @@ applyrules(Client *c)
 	if (!(title = client_get_title(c)))
 		title = broken;
 
-	for (r = rules; r < END(rules); r++) {
+	for (r = rules; r->id || r->title; r++) {
 		if ((!r->title || strstr(title, r->title))
 				&& (!r->id || strstr(appid, r->id))) {
 			c->isfloating = r->isfloating;
@@ -1472,6 +1474,50 @@ fullscreennotify(struct wl_listener *listener, void *data)
 	setfullscreen(c, client_wants_fullscreen(c));
 }
 
+Rule *
+getrule(Client *c)
+{
+	Rule *r, *e = NULL;
+	const char *appid, *title;
+
+	if (!c)
+		return NULL;
+	
+	if (!(appid = client_get_appid(c)))
+		appid = broken;
+	if (!(title = client_get_title(c)))
+		title = broken;
+
+	/*
+	 * Find first matching rule from the end. It seems intuitive to me
+	 * that the the first matching rule from the end is going to be
+	 * overriden. I also do not include the last element (hence -2)
+	 * in the search because we always want to keep at least one empty
+	 * slot for applyrules().
+	 */
+	for (r = END(rules) - 2; r >= rules; r--) {
+		if (!r->title && !r->id) {
+			e = r;
+		} else {
+			if ((!r->title || strstr(title, r->title))
+					&& (!r->id || strstr(appid, r->id))) {
+				break;
+			}
+		}
+	}
+	if (r < rules)
+		r = e;
+	if (!r) /* No free slots left */
+		return NULL;
+	if (r == e) { /* Fill the empty slot */
+		*r = rule_default;
+		/* r->title = strdup(title); */
+		r->id = strdup(appid);
+	}
+
+	return r;
+}
+
 void
 gpureset(struct wl_listener *listener, void *data)
 {
@@ -2417,6 +2463,15 @@ setpsel(struct wl_listener *listener, void *data)
 	wlr_seat_set_primary_selection(seat, event->source, event->serial);
 }
 
+void
+setruleisfloating(const Arg *arg)
+{
+	Rule *r = getrule(focustop(selmon));
+	if (!r)
+		return;
+	r->isfloating = !r->isfloating;
+}
+
 void
 setsel(struct wl_listener *listener, void *data)
 {
-- 
2.48.1