From ab565e2c8722ae5ee6d7746ea1630da9f42bbff2 Mon Sep 17 00:00:00 2001
From: Charlotte Meyer <dev@buffet.sh>
Date: Tue, 26 Mar 2019 21:45:00 +0100
Subject: [PATCH] Spawning a frontend

---
 include/kiwmi/frontend.h | 19 ++++++++++++++++
 include/kiwmi/server.h   |  6 ++++-
 kiwmi/frontend.c         | 47 ++++++++++++++++++++++++++++++++++++++++
 kiwmi/main.c             |  2 +-
 kiwmi/meson.build        |  1 +
 kiwmi/server.c           |  8 ++++++-
 6 files changed, 80 insertions(+), 3 deletions(-)
 create mode 100644 include/kiwmi/frontend.h
 create mode 100644 kiwmi/frontend.c

diff --git a/include/kiwmi/frontend.h b/include/kiwmi/frontend.h
new file mode 100644
index 0000000..3772ca6
--- /dev/null
+++ b/include/kiwmi/frontend.h
@@ -0,0 +1,19 @@
+/* Copyright (c), Charlotte Meyer <dev@buffet.sh>
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef KIWMI_FRONTEND_H
+#define KIWMI_FRONTEND_H
+
+#include <stdbool.h>
+
+struct kiwmi_frontend {
+    const char *frontend_path;
+};
+
+bool frontend_init(struct kiwmi_frontend *frontend, const char *frontend_path);
+
+#endif /* KIWMI_FRONTEND_H */
diff --git a/include/kiwmi/server.h b/include/kiwmi/server.h
index 23ff90c..42f772c 100644
--- a/include/kiwmi/server.h
+++ b/include/kiwmi/server.h
@@ -8,7 +8,10 @@
 #ifndef KIWMI_SERVER_H
 #define KIWMI_SERVER_H
 
+#include <stdbool.h>
+
 #include "kiwmi/desktop/desktop.h"
+#include "kiwmi/frontend.h"
 #include "kiwmi/input/input.h"
 
 struct kiwmi_server {
@@ -17,9 +20,10 @@ struct kiwmi_server {
     const char *socket;
     struct kiwmi_desktop desktop;
     struct kiwmi_input input;
+    struct kiwmi_frontend frontend;
 };
 
-bool server_init(struct kiwmi_server *server);
+bool server_init(struct kiwmi_server *server, const char *frontend_path);
 bool server_run(struct kiwmi_server *server);
 void server_fini(struct kiwmi_server *server);
 
diff --git a/kiwmi/frontend.c b/kiwmi/frontend.c
new file mode 100644
index 0000000..bc082e5
--- /dev/null
+++ b/kiwmi/frontend.c
@@ -0,0 +1,47 @@
+/* Copyright (c), Charlotte Meyer <dev@buffet.sh>
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include "kiwmi/frontend.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <unistd.h>
+
+#include <wlr/util/log.h>
+
+static bool
+spawn_frontend(const char *path)
+{
+    pid_t pid = fork();
+
+    if (pid < 0) {
+        wlr_log(WLR_ERROR, "Failed to start frontend (fork)");
+        return false;
+    }
+
+    if (pid == 0) {
+        execlp(path, path, NULL);
+        wlr_log(WLR_ERROR, "Failed to start frontend (exec), continuing");
+        _exit(EXIT_FAILURE);
+    }
+
+    return true;
+}
+
+bool
+frontend_init(struct kiwmi_frontend *frontend, const char *frontend_path)
+{
+    frontend->frontend_path = frontend_path;
+
+    if (strcmp(frontend_path, "NONE") == 0) {
+        wlr_log(WLR_ERROR, "Launching without a frontend");
+        return true;
+    } else {
+        return spawn_frontend(frontend_path);
+    }
+}
diff --git a/kiwmi/main.c b/kiwmi/main.c
index e4e5fac..d5076de 100644
--- a/kiwmi/main.c
+++ b/kiwmi/main.c
@@ -72,7 +72,7 @@ main(int argc, char **argv)
 
     struct kiwmi_server server;
 
-    if (!server_init(&server)) {
+    if (!server_init(&server, frontend_path)) {
         wlr_log(WLR_ERROR, "Failed to initialize server");
         exit(EXIT_FAILURE);
     }
diff --git a/kiwmi/meson.build b/kiwmi/meson.build
index 489b970..3a8feeb 100644
--- a/kiwmi/meson.build
+++ b/kiwmi/meson.build
@@ -1,5 +1,6 @@
 kiwmi_sources = files(
   'main.c',
+  'frontend.c',
   'server.c',
   'desktop/desktop.c',
   'desktop/output.c',
diff --git a/kiwmi/server.c b/kiwmi/server.c
index 9eace5a..98d1248 100644
--- a/kiwmi/server.c
+++ b/kiwmi/server.c
@@ -15,7 +15,7 @@
 #include <wlr/util/log.h>
 
 bool
-server_init(struct kiwmi_server *server)
+server_init(struct kiwmi_server *server, const char *frontend_path)
 {
     wlr_log(WLR_DEBUG, "Initializing Wayland server");
 
@@ -42,6 +42,12 @@ server_init(struct kiwmi_server *server)
         return false;
     }
 
+    if (!frontend_init(&server->frontend, frontend_path)) {
+        wlr_log(WLR_ERROR, "Failed to initialize frontend");
+        wl_display_destroy(server->wl_display);
+        return false;
+    }
+
     return true;
 }