feat(cli): add --config to command line options

lib/config/config-loader.js

@@ -1,10 +1,26 @@
 // LICENSE : MIT
 "use strict";
 var rc = require('rc-loader');
+var tryResolve = require("try-resolve");
 // DEFAULT CONFIG FILE NAME
 var CONFIG_FILENAME = "textlint";
+var CONFIG_PACKAGE_PREFIX = "textlint-config-";
+function isConfigModule(filePath) {
+    if (filePath == null) {
+        return false;
+    }
+    // scoped module package
+    return (filePath.charAt(0) === "@" || filePath.indexOf(CONFIG_PACKAGE_PREFIX) !== -1);
+}
 function load(configFilePath) {
-    var config = configFilePath ? {config: configFilePath} : null;
-    return rc(CONFIG_FILENAME, {}, config);
+    if (isConfigModule(configFilePath)) {
+        // config as a module - shared config
+        // FIXME: not tested function
+        return require(tryResolve.relative(configFilePath))
+    } else {
+        // auto or specify config file
+        var config = configFilePath ? {config: configFilePath} : null;
+        return rc(CONFIG_FILENAME, {}, config);
+    }
 }
 module.exports = load;

lib/config/config.js

@@ -42,6 +42,8 @@ function Config(options) {
      * @type {string|null}
      */
     this.configFile = options.configFile;
+    // TODO: add `noUseConfig` option
+    // configFile is optional
     var userConfig = loadConfig(this.configFile);
     // rule names
     var ruleKeys = userConfig.rules ? availableRuleKeys(userConfig.rules) : [];

lib/options.js

@@ -14,6 +14,13 @@ module.exports = optionator({
             type: "Boolean",
             description: "Show help."
         },
+        {
+            option: "config",
+            alias: "c",
+            type: "path::String",
+            description: "Use configuration from this file or sharable config.",
+            example: "--config /path/to/.textlintrc"
+        },
         {
             option: "rule",
             type: "[path::String]",

lib/textlint-engine.js

@@ -5,7 +5,6 @@ var textLint = require("./textlint");
 var fileTraverse = require("./util/traverse");
 var Config = require("./config/config");
 var createFormatter = require("textlint-formatter");
-var fs = require("fs");
 var tryResolve = require("try-resolve");
 var path = require("path");
 var debug = require("debug")("text:cli-engine");