view: associate launch contexts with views

Views now maintain a reference to a launch context which, as a last
resort, is populated at map time with a context associated with its pid.
This opens the possibility of populating it before map via another
source, e.g. xdga-tokens or configuration.

include/sway/desktop/launcher.h

@@ -3,10 +3,26 @@
 
 #include <stdlib.h>
 
-struct sway_workspace *workspace_for_pid(pid_t pid);
+struct launcher_ctx {
+	pid_t pid;
+	char *name;
+	struct wlr_xdg_activation_token_v1 *token;
+	struct wl_listener token_destroy;
+
+	struct sway_node *node;
+	struct wl_listener node_destroy;
+
+	struct wl_list link; // sway_server::pending_launcher_ctxs
+};
+
+struct launcher_ctx *launcher_ctx_find_pid(pid_t pid);
+
+struct sway_workspace *launcher_ctx_get_workspace(struct launcher_ctx *ctx);
+
+void launcher_ctx_consume(struct launcher_ctx *ctx);
+
+void launcher_ctx_destroy(struct launcher_ctx *ctx);
 
 void launcher_ctx_create(pid_t pid);
 
-void remove_workspace_pid(pid_t pid);
-
 #endif

include/sway/tree/view.h

@@ -74,6 +74,7 @@ struct sway_view {
 	struct sway_xdg_decoration *xdg_decoration;
 
 	pid_t pid;
+	struct launcher_ctx *ctx;
 
 	// The size the view would want to be if it weren't tiled.
 	// Used when changing a view from tiled to floating.
@@ -372,4 +373,6 @@ void view_save_buffer(struct sway_view *view);
 
 bool view_is_transient_for(struct sway_view *child, struct sway_view *ancestor);
 
+void view_assign_ctx(struct sway_view *view, struct launcher_ctx *ctx);
+
 #endif

sway/desktop/launcher.c

@@ -13,18 +13,6 @@
 
 static struct wl_list launcher_ctxs;
 
-struct launcher_ctx {
-	pid_t pid;
-	char *name;
-	struct wlr_xdg_activation_token_v1 *token;
-	struct wl_listener token_destroy;
-
-	struct sway_node *node;
-	struct wl_listener node_destroy;
-
-	struct wl_list link;
-};
-
 /**
  * Get the pid of a parent process given the pid of a child process.
  *
@@ -59,7 +47,20 @@ static pid_t get_parent_pid(pid_t child) {
 	return -1;
 }
 
-static void launcher_ctx_destroy(struct launcher_ctx *ctx) {
+void launcher_ctx_consume(struct launcher_ctx *ctx) {
+	// The view is now responsible for destroying this ctx
+	wl_list_remove(&ctx->token_destroy.link);
+	wl_list_init(&ctx->token_destroy.link);
+
+	wlr_xdg_activation_token_v1_destroy(ctx->token);
+	ctx->token = NULL;
+
+	// Prevent additional matches
+	wl_list_remove(&ctx->link);
+	wl_list_init(&ctx->link);
+}
+
+void launcher_ctx_destroy(struct launcher_ctx *ctx) {
 	if (ctx == NULL) {
 		return;
 	}
@@ -71,7 +72,7 @@ static void launcher_ctx_destroy(struct launcher_ctx *ctx) {
 	free(ctx);
 }
 
-static struct launcher_ctx *launcher_ctx_find_pid(pid_t pid) {
+struct launcher_ctx *launcher_ctx_find_pid(pid_t pid) {
 	if (!launcher_ctxs.prev && !launcher_ctxs.next) {
 		wl_list_init(&launcher_ctxs);
 		return NULL;
@@ -97,7 +98,7 @@ static struct launcher_ctx *launcher_ctx_find_pid(pid_t pid) {
 	return ctx;
 }
 
-static struct sway_workspace *launcher_ctx_get_workspace(
+struct sway_workspace *launcher_ctx_get_workspace(
 		struct launcher_ctx *ctx) {
 	struct sway_workspace *ws = NULL;
 	struct sway_output *output = NULL;
@@ -135,16 +136,6 @@ static struct sway_workspace *launcher_ctx_get_workspace(
 	return ws;
 }
 
-struct sway_workspace *workspace_for_pid(pid_t pid) {
-	struct launcher_ctx *ctx = launcher_ctx_find_pid(pid);
-	if (ctx == NULL) {
-		return NULL;
-	}
-	struct sway_workspace *ws = launcher_ctx_get_workspace(ctx);
-	launcher_ctx_destroy(ctx);
-	return ws;
-}
-
 static void ctx_handle_node_destroy(struct wl_listener *listener, void *data) {
 	struct launcher_ctx *ctx = wl_container_of(listener, ctx, node_destroy);
 	switch (ctx->node->type) {
@@ -217,12 +208,3 @@ void launcher_ctx_create(pid_t pid) {
 
 	wl_list_insert(&launcher_ctxs, &ctx->link);
 }
-
-void remove_workspace_pid(pid_t pid) {
-	if (!launcher_ctxs.prev || !launcher_ctxs.next) {
-		return;
-	}
-
-	struct launcher_ctx *ctx = launcher_ctx_find_pid(pid);
-	launcher_ctx_destroy(ctx);
-}

sway/tree/view.c

@@ -64,6 +64,8 @@ void view_destroy(struct sway_view *view) {
 	}
 	list_free(view->executed_criteria);
 
+	view_assign_ctx(view, NULL);
+
 	free(view->title_format);
 
 	if (view->impl->destroy) {
@@ -534,6 +536,20 @@ static void view_populate_pid(struct sway_view *view) {
 	view->pid = pid;
 }
 
+void view_assign_ctx(struct sway_view *view, struct launcher_ctx *ctx) {
+	if (view->ctx) {
+		// This ctx has been replaced
+		launcher_ctx_destroy(view->ctx);
+		view->ctx = NULL;
+	}
+	if (ctx == NULL) {
+		return;
+	}
+	launcher_ctx_consume(ctx);
+
+	view->ctx = ctx;
+}
+
 static struct sway_workspace *select_workspace(struct sway_view *view) {
 	struct sway_seat *seat = input_manager_current_seat();
 
@@ -569,13 +585,14 @@ static struct sway_workspace *select_workspace(struct sway_view *view) {
 	}
 	list_free(criterias);
 	if (ws) {
-		remove_workspace_pid(view->pid);
+		view_assign_ctx(view, NULL);
 		return ws;
 	}
 
 	// Check if there's a PID mapping
-	ws = workspace_for_pid(view->pid);
+	ws = view->ctx ? launcher_ctx_get_workspace(view->ctx) : NULL;
 	if (ws) {
+		view_assign_ctx(view, NULL);
 		return ws;
 	}
 
@@ -718,6 +735,13 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface,
 	view_populate_pid(view);
 	view->container = container_create(view);
 
+	if (view->ctx == NULL) {
+		struct launcher_ctx *ctx = launcher_ctx_find_pid(view->pid);
+		if (ctx != NULL) {
+			view_assign_ctx(view, ctx);
+		}
+	}
+
 	// If there is a request to be opened fullscreen on a specific output, try
 	// to honor that request. Otherwise, fallback to assigns, pid mappings,
 	// focused workspace, etc