More descriptive bin program output (fixes #1)

src/utilities/index.js

@@ -1,8 +1,10 @@
 'create index';
 
 export createIndexCode from './createIndexCode.js';
+export log from './log.js';
 export readDirectory from './readDirectory.js';
 export sortByDepth from './sortByDepth.js';
 export validateTargetDirectory from './validateTargetDirectory.js';
 export writeIndex from './writeIndex.js';
+export writeIndexCli from './writeIndexCli.js';
 

src/utilities/log.js

@@ -0,0 +1,8 @@
+import chalk from 'chalk';
+import moment from 'moment';
+
+export default (...append) => {
+    /* eslint-disable no-console */
+    console.log(chalk.dim('[' + moment().format('HH:mm:ss') + ']'), ...append);
+    /* eslint-enable no-console */
+};

src/utilities/writeIndexCli.js

@@ -0,0 +1,54 @@
+import _ from 'lodash';
+import createIndexCode from './createIndexCode';
+import fs from 'fs';
+import path from 'path';
+import validateTargetDirectory from './validateTargetDirectory';
+import readDirectory from './readDirectory';
+import sortByDepth from './sortByDepth';
+import log from './log';
+import chalk from 'chalk';
+
+export default (directoryPaths) => {
+    let sortedDirectoryPaths;
+
+    sortedDirectoryPaths = sortByDepth(directoryPaths);
+
+    log('Target directories', sortedDirectoryPaths);
+
+    _.forEach(sortedDirectoryPaths, (directoryPath) => {
+        validateTargetDirectory(directoryPath);
+    });
+
+    _.forEach(sortedDirectoryPaths, (directoryPath) => {
+        let existingIndexCode,
+            indexCode,
+            indexFilePath,
+            siblings;
+
+        siblings = readDirectory(directoryPath);
+
+        indexCode = createIndexCode(siblings);
+
+        indexFilePath = path.resolve(directoryPath, 'index.js');
+
+        try {
+            existingIndexCode = fs.readFileSync(indexFilePath, 'utf8');
+        /* eslint-disable no-empty */
+        } catch (error) {
+
+        }
+        /* eslint-enable no-empty */
+
+        fs.writeFileSync(indexFilePath, indexCode);
+
+        if (existingIndexCode && existingIndexCode === indexCode) {
+            log(indexFilePath, chalk.yellow('[index have not changed]'));
+        } else if (existingIndexCode && existingIndexCode !== indexCode) {
+            log(indexFilePath, chalk.green('[updated index]'));
+        } else {
+            log(indexFilePath, chalk.green('[created index]'));
+        }
+    });
+
+    log('Done');
+};