config: implement ncu-config

Author: joyeecheung

bin/ncu-config

@@ -0,0 +1,71 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {
+  getConfig, updateConfig
+} = require('../lib/config');
+
+const yargs = require('yargs');
+const argv = yargs
+  .command({
+    command: 'set <key> <value>',
+    desc: 'Set a config variable',
+    builder: (yargs) => {
+      yargs
+        .positional('key', {
+          describe: 'key of the configuration',
+          type: 'string'
+        })
+        .positional('value', {
+          describe: 'value of the configuration'
+        });
+    },
+    handler: setHandler
+  })
+  .command({
+    command: 'get <key>',
+    desc: 'Get a config variable',
+    builder: (yargs) => {
+      yargs
+        .positional('key', {
+          describe: 'key of the configuration',
+          type: 'string'
+        });
+    },
+    handler: getHandler
+  })
+  .command({
+    command: 'list',
+    desc: 'List the configurations',
+    handler: listHandler
+  })
+  .demandCommand(1, 'must provide a valid command')
+  .boolean('global')
+  .default({ global: false })
+  .help()
+  .argv;
+
+function setHandler(argv) {
+  const config = getConfig(argv.global);
+  console.log(
+    `Updating ${argv.global ? 'global' : 'local'} configuration ` +
+    `[${argv.key}]: ${config[argv.key]} -> ${argv.value}`);
+  updateConfig(argv.global, { [argv.key]: argv.value });
+}
+
+function getHandler(argv) {
+  const config = getConfig(argv.global);
+  console.log(config[argv.key]);
+}
+
+function listHandler(argv) {
+  const config = getConfig(argv.global);
+  for (const key of Object.keys(config)) {
+    console.log(`${key}: ${config[key]}`);
+  }
+}
+
+if (!['get', 'set', 'list'].includes(argv._[0])) {
+  yargs.showHelp();
+}

lib/config.js

@@ -0,0 +1,49 @@
+'use strict';
+
+const path = require('path');
+const os = require('os');
+const { readJson, writeJson } = require('./file');
+
+exports.getMergedConfig = function(dir, home) {
+  const globalConfig = exports.getConfig(true, home);
+  const localConfig = exports.getConfig(false, dir);
+  return Object.assign(globalConfig, localConfig);
+};
+
+exports.getConfig = function(isGlobal, dir) {
+  const configPath = exports.getConfigPath(isGlobal, dir);
+  return readJson(configPath);
+};
+
+exports.getConfigPath = function(isGlobal, dir) {
+  if (isGlobal) {
+    const home = exports.getHomeDir(dir);
+    const ncurcPath = path.join(home, '.ncurc');
+    return ncurcPath;
+  } else {
+    const ncuDir = exports.getNcuDir(dir);
+    const configPath = path.join(ncuDir, 'config');
+    return configPath;
+  }
+};
+
+exports.writeConfig = function(isGlobal, obj, dir) {
+  writeJson(exports.getConfigPath(isGlobal, dir), obj);
+};
+
+exports.updateConfig = function(isGlobal, obj, dir) {
+  const config = exports.getConfig(isGlobal, dir);
+  const configPath = exports.getConfigPath(isGlobal, dir);
+  writeJson(configPath, Object.assign(config, obj));
+};
+
+exports.getHomeDir = function(home) {
+  if (process.env.XDG_CONFIG_HOME) {
+    return process.env.XDG_CONFIG_HOME;
+  }
+  return home || os.homedir();
+};
+
+exports.getNcuDir = function(dir) {
+  return path.join(dir || process.cwd(), '.ncu');
+};

lib/file.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const fs = require('fs');
+
+exports.writeFile = function(file, content) {
+  fs.writeFileSync(file, content, 'utf8');
+};
+
+exports.writeJson = function(file, obj) {
+  exports.writeFile(file, JSON.stringify(obj, null, 2));
+};
+
+exports.readFile = function(file) {
+  if (fs.existsSync(file)) {
+    return fs.readFileSync(file, 'utf8');
+  }
+  return '';
+};
+
+exports.readJson = function(file) {
+  const content = exports.readFile(file);
+  if (content) {
+    return JSON.parse(content);
+  }
+  return {};
+};

package.json

@@ -4,7 +4,8 @@
   "description": "Utilities for Node.js core collaborators",
   "main": "./bin/metadata.js",
   "bin": {
-    "get-metadata": "./bin/get-metadata"
+    "get-metadata": "./bin/get-metadata",
+    "ncu-config": "./bin/ncu-config"
   },
   "scripts": {
     "test": "npm run test-unit && npm run lint",
@@ -33,6 +34,7 @@
     "ghauth": "^3.2.1",
     "jsdom": "^11.3.0",
     "ora": "^1.3.0",
+    "read": "^1.0.7",
     "request": "^2.83.0",
     "request-promise-native": "^1.0.5",
     "yargs": "^10.0.3"