1 files changed, 113 insertions, 0 deletions
diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..a053638
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gio/gio.h>
+
+#include "utils.h"
+
+/* Search by descending quality level */
+static const gchar *icon_sizes[] = {
+    "scalable",
+    "512x512",
+    "256x256",
+    "192x192",
+    "128x128",
+    "96x96",
+    "72x72",
+    "64x64",
+    "48x48",
+    "32x32",
+    "24x24",
+    "16x16",
+    "symbolic",
+    NULL
+};
+
+/*
+ * Recursively search the `base_path` folder for a file whose name
+ * starts with `icon_name`: this way we don't care about the extension
+ * and can also get files with an extended name (for example,
+ * "`icon_name`-symbolic.png" would still be recognized as a valid match)
+ */
+static gchar *find_icon(const gchar *base_path, const gchar *icon_name)
+{
+    g_autoptr(GFile) base_dir = g_file_new_for_path(base_path);
+    g_autoptr(GFileEnumerator) child_list =
+            g_file_enumerate_children(base_dir, "*", G_FILE_QUERY_INFO_NONE,
+                                      NULL, NULL);
+
+    if (!child_list)
+        return NULL;
+
+    while (TRUE) {
+        GFile *current_file;
+        GFileInfo *current_file_info;
+
+        g_file_enumerator_iterate(child_list, &current_file_info,
+                                  &current_file, NULL, NULL);
+        if (!current_file_info || !current_file)
+            break;
+
+        if (g_file_info_get_file_type(current_file_info) == G_FILE_TYPE_DIRECTORY) {
+            gchar *icon_path = find_icon(g_file_get_path(current_file), icon_name);
+            if (icon_path)
+                return icon_path;
+        } else if (g_str_has_prefix(g_file_get_basename(current_file), icon_name)) {
+            return g_strdup(g_file_get_path(current_file));
+        }
+    }
+
+    return NULL;
+}
+
+/*
+ * Search through a list of folders for the `icon_name` icon file
+ */
+gchar *applaunchd_utils_get_icon(GStrv dir_list, const gchar *icon_name)
+{
+    gchar *icon_path = NULL;
+
+    for (GStrv base_path = dir_list; *base_path != NULL ; base_path++) {
+        g_autoptr(GFile) base_dir = g_file_new_build_filename(*base_path,
+                                                              "icons", NULL);
+
+        g_autoptr(GFileEnumerator) child_list =
+                g_file_enumerate_children(base_dir, "standard::type=directory",
+                                          G_FILE_QUERY_INFO_NONE, NULL, NULL);
+
+        if (!child_list)
+            continue;
+
+        while (TRUE) {
+            GFile *theme_dir;
+            g_file_enumerator_iterate(child_list, NULL, &theme_dir,
+                                      NULL, NULL);
+            if (!theme_dir)
+                break;
+
+            for (gint i = 0; icon_sizes[i]; i++) {
+                g_autofree gchar *theme_path =
+                        g_build_filename(g_file_get_path(theme_dir),
+                                         icon_sizes[i], NULL);
+                icon_path = find_icon(theme_path, icon_name);
+                if (icon_path)
+                    return icon_path;
+            }
+        }
+    }
+
+    return NULL;
+}