feat: add --extension/-x parameter overwrite default .js extension parser (#35)

src/bin/create-index.js

@@ -37,12 +37,22 @@ const argv = yargs
       type: 'string'
     }
   })
+  .options({
+    extensions: {
+      alias: 'x',
+      default: ['js'],
+      description: 'Allows some extensions to be parsed as valid source. First extension will always be preferred to homonyms with another allowed extension.',
+      type: 'array'
+    }
+  })
   .example('create-index ./src ./src/utilities', 'Creates or updates an existing create-index index file in the target (./src, ./src/utilities) directories.')
   .example('create-index --update ./src ./tests', 'Finds all create-index index files in the target directories and descending directories. Updates found index files.')
+  .example('create-index ./src --extensions js jsx', 'Creates or updates an existing create-index index file in the target (./src) directory for both .js and .jsx extensions.')
   .argv;
 
 writeIndexCli(argv._, {
   banner: argv.banner,
+  extensions: argv.extensions,
   ignoreUnsafe: argv.ignoreUnsafe,
   recursive: argv.recursive,
   updateIndex: argv.update

src/utilities/readDirectory.js

@@ -31,9 +31,26 @@ const isSafeName = (fileName) => {
   return /^[a-z][a-z0-9._]+$/i.test(fileName);
 };
 
-const removeDuplicates = (files) => {
+const stripExtension = (fileName) => {
+  const pos = fileName.lastIndexOf('.');
+
+  if (pos === -1) {
+    return fileName;
+  }
+
+  return fileName.substr(0, pos);
+};
+
+const removeDuplicates = (files, preferredExtension) => {
   return _.filter(files, (fileName) => {
-    return !_.includes(files, fileName + '.js');
+    const withoutExtension = stripExtension(fileName);
+    const mainAlternative = withoutExtension + '.' + preferredExtension;
+
+    if (mainAlternative === fileName) {
+      return true;
+    }
+
+    return !_.includes(files, mainAlternative);
   });
 };
 
@@ -45,6 +62,7 @@ export default (directoryPath, options = {}) => {
   }
 
   children = fs.readdirSync(directoryPath);
+  const {extensions = ['js']} = options;
 
   children = _.filter(children, (fileName) => {
     const absolutePath = path.resolve(directoryPath, fileName);
@@ -66,7 +84,9 @@ export default (directoryPath, options = {}) => {
       return false;
     }
 
-    if (!isDirectory && !_.endsWith(fileName, '.js')) {
+    if (!isDirectory && !extensions.some((ext) => {
+      return _.endsWith(fileName, '.' + ext);
+    })) {
       return false;
     }
 
@@ -77,7 +97,7 @@ export default (directoryPath, options = {}) => {
     return true;
   });
 
-  children = removeDuplicates(children);
+  children = removeDuplicates(children, extensions[0]);
 
   return children.sort();
 };

src/utilities/writeIndex.js

@@ -13,7 +13,7 @@ export default (directoryPaths, options = {}) => {
     });
 
   _.forEach(sortedDirectoryPaths, (directoryPath) => {
-    const siblings = readDirectory(directoryPath);
+    const siblings = readDirectory(directoryPath, options);
     const indexCode = createIndexCode(siblings);
     const indexFilePath = path.resolve(directoryPath, 'index.js');
 

src/utilities/writeIndexCli.js

@@ -20,6 +20,7 @@ export default (directoryPaths, options = {}) => {
   } else {
     log('Recursive:', options.recursive ? chalk.green('true') : chalk.red('false'));
     log('Ignore unsafe:', options.ignoreUnsafe ? chalk.green('true') : chalk.red('false'));
+    log('Extensions:', chalk.green(options.extensions));
   }
 
   if (options.updateIndex || options.recursive) {
@@ -43,7 +44,10 @@ export default (directoryPaths, options = {}) => {
   _.forEach(sortedDirectoryPaths, (directoryPath) => {
     let existingIndexCode;
 
-    const siblings = readDirectory(directoryPath, {silent: options.ignoreUnsafe});
+    const siblings = readDirectory(directoryPath, {
+      extensions: options.extensions,
+      silent: options.ignoreUnsafe
+    });
 
     const indexCode = createIndexCode(siblings, {
       banner: options.banner