Add proper user-friendly theme manager (#635)

Co-authored-by: Justice Almanzar <superdash993@gmail.com>
Co-authored-by: Nuckyz <61953774+Nuckyz@users.noreply.github.com>
Co-authored-by: V <vendicated@riseup.net>

1 files changed, 81 insertions, 0 deletions

diff --git a/src/main/themes/index.ts b/src/main/themes/index.ts
new file mode 100644
index 0000000..f660e50
--- /dev/null
+++ b/src/main/themes/index.ts
@@ -0,0 +1,81 @@
+/* eslint-disable header/header */
+
+/*!
+ * BetterDiscord addon meta parser
+ * Copyright 2023 BetterDiscord contributors
+ * Copyright 2023 Vendicated and Vencord contributors
+ *
+ * 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.
+ */
+
+const splitRegex = /[^\S\r\n]*?\r?(?:\r\n|\n)[^\S\r\n]*?\*[^\S\r\n]?/;
+const escapedAtRegex = /^\\@/;
+
+export interface UserThemeHeader {
+    fileName: string;
+    name: string;
+    author: string;
+    description: string;
+    version?: string;
+    license?: string;
+    source?: string;
+    website?: string;
+    invite?: string;
+}
+
+function makeHeader(fileName: string, opts: Partial<UserThemeHeader> = {}): UserThemeHeader {
+    return {
+        fileName,
+        name: opts.name ?? fileName.replace(/\.css$/i, ""),
+        author: opts.author ?? "Unknown Author",
+        description: opts.description ?? "A Discord Theme.",
+        version: opts.version,
+        license: opts.license,
+        source: opts.source,
+        website: opts.website,
+        invite: opts.invite
+    };
+}
+
+export function stripBOM(fileContent: string) {
+    if (fileContent.charCodeAt(0) === 0xFEFF) {
+        fileContent = fileContent.slice(1);
+    }
+    return fileContent;
+}
+
+export function getThemeInfo(css: string, fileName: string): UserThemeHeader {
+    if (!css) return makeHeader(fileName);
+
+    const block = css.split("/**", 2)?.[1]?.split("*/", 1)?.[0];
+    if (!block) return makeHeader(fileName);
+
+    const header: Partial<UserThemeHeader> = {};
+    let field = "";
+    let accum = "";
+    for (const line of block.split(splitRegex)) {
+        if (line.length === 0) continue;
+        if (line.charAt(0) === "@" && line.charAt(1) !== " ") {
+            header[field] = accum.trim();
+            const l = line.indexOf(" ");
+            field = line.substring(1, l);
+            accum = line.substring(l + 1);
+        }
+        else {
+            accum += " " + line.replace("\\n", "\n").replace(escapedAtRegex, "@");
+        }
+    }
+    header[field] = accum.trim();
+    delete header[""];
+    return makeHeader(fileName, header);
+}