feat(#35): multiple style sheets

src/parser/config.ts

@@ -30,6 +30,20 @@ const configPaths = [
     path.join(homedir(), '.vivify.json'),
 ];
 
+// read contents of file at paths or files at paths
+const getFileContents = (paths: string[] | string | undefined): string => {
+    if (paths === undefined) return '';
+    const getFileContent = (p: string): string => {
+        const resolved = p[0] === '~' ? path.join(homedir(), p.slice(1)) : p;
+        return fs.existsSync(resolved) ? fs.readFileSync(resolved, 'utf8') : '';
+    };
+
+    if (Array.isArray(paths)) {
+        return paths.map(getFileContent).join('\n');
+    }
+    return getFileContent(paths);
+};
+
 const getConfig = (): Config => {
     let config = undefined;
     // greedily get config
@@ -44,11 +58,8 @@ const getConfig = (): Config => {
     if (config === undefined) return defaultConfig;
 
     // get styles
-    if (config.styles && config.styles.length > 0) {
-        const stylePath =
-            config.styles[0] === '~' ? path.join(homedir(), config.styles.slice(1)) : config.styles;
-        config.styles = fs.existsSync(stylePath) ? fs.readFileSync(stylePath, 'utf8') : '';
-    }
+    config.styles = getFileContents(config.styles);
+
     // fill missing values from default config
     for (const [key, value] of Object.entries(defaultConfig)) {
         if (config[key] === undefined) config[key] = value;