launcher: export xdga tokens and use them for workspace matching

include/sway/desktop/launcher.h

@@ -9,6 +9,8 @@ struct launcher_ctx {
 	struct wlr_xdg_activation_token_v1 *token;
 	struct wl_listener token_destroy;
 
+	bool activated;
+
 	struct sway_node *node;
 	struct wl_listener node_destroy;
 
@@ -25,4 +27,6 @@ void launcher_ctx_destroy(struct launcher_ctx *ctx);
 
 struct launcher_ctx *launcher_ctx_create(void);
 
+const char *launcher_ctx_get_token_name(struct launcher_ctx *ctx);
+
 #endif

sway/commands/exec_always.c

@@ -27,6 +27,11 @@ struct cmd_results *cmd_exec_validate(int argc, char **argv) {
 	return error;
 }
 
+static void export_xdga_token(struct launcher_ctx *ctx) {
+	const char *token = launcher_ctx_get_token_name(ctx);
+	setenv("XDG_ACTIVATION_TOKEN", token, 1);
+}
+
 struct cmd_results *cmd_exec_process(int argc, char **argv) {
 	struct cmd_results *error = NULL;
 	char *cmd = NULL;
@@ -66,6 +71,9 @@ struct cmd_results *cmd_exec_process(int argc, char **argv) {
 		close(fd[0]);
 		if ((child = fork()) == 0) {
 			close(fd[1]);
+			if (ctx) {
+				export_xdga_token(ctx);
+			}
 			execlp("sh", "sh", "-c", cmd, (void *)NULL);
 			sway_log_errno(SWAY_ERROR, "execlp failed");
 			_exit(1);

sway/desktop/launcher.c

@@ -50,7 +50,10 @@ void launcher_ctx_consume(struct launcher_ctx *ctx) {
 	wl_list_remove(&ctx->token_destroy.link);
 	wl_list_init(&ctx->token_destroy.link);
 
-	wlr_xdg_activation_token_v1_destroy(ctx->token);
+	if (!ctx->activated) {
+		// An unactivated token hasn't been destroyed yet
+		wlr_xdg_activation_token_v1_destroy(ctx->token);
+	}
 	ctx->token = NULL;
 
 	// Prevent additional matches
@@ -201,3 +204,8 @@ struct launcher_ctx *launcher_ctx_create() {
 	wl_list_insert(&server.pending_launcher_ctxs, &ctx->link);
 	return ctx;
 }
+
+const char *launcher_ctx_get_token_name(struct launcher_ctx *ctx) {
+	const char *token = wlr_xdg_activation_token_v1_get_name(ctx->token);
+	return token;
+}

sway/xdg_activation_v1.c

@@ -1,4 +1,5 @@
 #include <wlr/types/wlr_xdg_activation_v1.h>
+#include "sway/desktop/launcher.h"
 #include "sway/tree/view.h"
 
 void xdg_activation_v1_handle_request_activate(struct wl_listener *listener,
@@ -15,7 +16,22 @@ void xdg_activation_v1_handle_request_activate(struct wl_listener *listener,
 		return;
 	}
 	struct sway_view *view = xdg_surface->data;
-	if (!xdg_surface->mapped || view == NULL) {
+	if (view == NULL) {
+		return;
+	}
+
+	if (!xdg_surface->mapped) {
+		// This is a startup notification. If we are tracking it, the data
+		// field is a launcher_ctx.
+		struct launcher_ctx *ctx = event->token->data;
+		if (!ctx || ctx->activated) {
+			// This ctx has already been activated and cannot be used again
+			// for a startup notification. It will be destroyed
+			return;
+		} else {
+			ctx->activated = true;
+			view_assign_ctx(view, ctx);
+		}
 		return;
 	}