feat(commands): option to specify .npmrc path with use (#13)

* chore(readme): update readme

* feat(commands): option to specify .npmrc path with `use`

README.md

@@ -18,9 +18,11 @@
 
 ## Synopsis
 
-`npmum` is a command line tool to manage your npm login user.
+`npmum` is a command line tool to manage your current `npm login` user.
 
-By storing tokens under a username alias, the token in `~/.npmrc` will be updated based on the username.
+If you've ever needed to publish to npm with multiple users, this tool is for you.
+
+`npmum` stores tokens under a username alias. This allows you to easily switch between users by changing the token in `~/.npmrc` based on the username alias.
 
 ## Install
 
@@ -30,9 +32,18 @@ $ npm install npmum -g
 
 ## Usage
 
+- First, obtain a token for your user from [npmjs.org](https://www.npmjs.com/)
+- Run `npmum add <YOUR_USER_NAME>` and paste your token when prompted
+    - You can also pass in the token with the `--token` option
+- Now, whenever you want to change to this user, simply run `npmum use <YOUR_USER_NAME>`
+- Use `npmum ls` to list your users and the current active user
+- To remove a user, run `npmum rm <YOUR_USER_NAME>`
+
+## API
+
 ### Add
 
-Will prompt you for a token to add under the name alias.  
+Prompts you for a token to add under the username alias.
 You can also provide the token via `-t`/`--token`.
 
 ```
@@ -41,23 +52,23 @@ $ npmum add <user>[ --token <token>]
 
 ### Use
 
-Use the provided user.
+Use the token for provided username alias.
 
 ```
 $ npmum use <user>
 ```
 
 ### Remove
 
-Remove a user from the config.
+Remove a user token from the config.
 
 ```
 $ npmum rm <user>
 ```
 
 ### List
 
-List users and their truncated tokens.
+List users and their truncated tokens, along with the current selected user.
 
 ```
 $ npmum ls

src/commands/use.js

@@ -28,25 +28,32 @@ function _writeNpmrc(path, text) {
   });
 }
 
-function handle(name) {
+function handle(name, options = {}) {
   const user = storage.getUser(name);
-  const npmrcPath = `${require('os').homedir()}/.npmrc`;
+  const npmrcPath = options.path || `${require('os').homedir()}/.npmrc`;
 
   return Promise.resolve()
   .then(() => {
     if (!user) throw new errors.UserNotFound();
     if (!user.token) throw new errors.InvalidUserToken();
 
+    if (!fs.existsSync(npmrcPath)) return '';
     return use._readNpmrc(npmrcPath);
   })
   .then(text => {
     const regexp = /(_authToken=)(.*)/i;
-    const updatedText = text.replace(regexp, `$1${user.token}`);
-    return use._writeNpmrc(npmrcPath, updatedText);
+    if (regexp.test(text)) {
+      const updateText = text.replace(regexp, `$1${user.token}`);
+      return updateText;
+    }
+
+    const setNewText = `//registry.npmjs.org/:_authToken=${user.token}`;
+    return setNewText;
   })
+  .then(text => use._writeNpmrc(npmrcPath, text))
   .then(() => {
     storage.setCurrentUser(name);
-    console.log(`NPM login user: ${name}.`);
+    console.log(`Set npm login user: "${name}".`);
     return true;
   })
   .catch(errors.handle);

src/errors.js

@@ -1,7 +1,7 @@
 function handle(err) {
   const message = err.message || 'Unknown error';
   const code = err.code || 1;
-  console.log(message);
+  console.error(message);
 
   process.exitCode = code;
   return false;

src/index.js

@@ -7,33 +7,29 @@ const ls = require('./commands/ls');
 const rm = require('./commands/rm');
 const use = require('./commands/use');
 const add = require('./commands/add');
-// const {login} = require('./commands/login');
 
 updateNotifier({pkg: {name, version}, updateCheckInterval: 1000 * 60 * 60 * 6})
   .notify({isGlobal: true});
 
 function setup(argv) {
   program.version(version);
 
-  // program.command('login')
-  //   .description('Add user via npm login')
-  //   .action(login);
-
   program.command('add <name>')
-    .description('Add token with name')
+    .description('Add a user alias to an npm token')
     .option('-t, --token <token>', 'Set token via command')
     .action(add.handle);
 
   program.command('ls')
-    .description('List token names')
+    .description('List user tokens and the current user')
     .action(ls.handle);
 
   program.command('rm')
-    .description('Remove token by name')
+    .description('Remove user token by name')
     .action(rm.handle);
 
   program.command('use <name>')
-    .description('Use token by name')
+    .description('Use user token by name')
+    .option('-p, --path <path>', 'Specify path to .npmrc')
     .action(use.handle);
 
   program.parse(argv);