[added] alternative package root folder option

Author: AlexKVal

README.md

@@ -35,6 +35,17 @@ including `bower` publishing, for you - automatically.
 _Initial idea is got from `React-Bootstrap` release tools `./tools/release`,
 that have been written by [Matt Smith @mtscout6](https://github.com/mtscout6)_
 
+#### Alternative npm package root folder
+
+Say you want to publish to `npmjs` only the content of your `lib` folder.
+Then you can do it as simple as adding this option to your `package.json`
+```json
+"release-script": {
+  "altPkgRootFolder": "lib"
+}
+```
+and that's all.
+
 #### Options
 
 All options for this package are kept under `'release-script'` node in your project's `package.json`
@@ -44,6 +55,7 @@ All options for this package are kept under `'release-script'` node in your proj
   - `default` value: `'amd'`
 - `tmpBowerRepo` - the folder name for temporary files for bower pkg.
   - `default` value: `'tmp-bower-repo'`
+- `altPkgRootFolder` - the folder name for alternative npm package root folder
 
 It is advised to add `bowerRoot` and `tmpBowerRepo` folders to your `.gitignore` file.
 
@@ -54,7 +66,8 @@ E.g.:
 "release-script": {
   "bowerRepo": "[email protected]:<org-author-name>/<name-of-project>-bower.git",
   "bowerRoot": "amd",
-  "tmpBowerRepo": "tmp-bower-repo"
+  "tmpBowerRepo": "tmp-bower-repo",
+  "altPkgRootFolder": "lib"
 }
 ```
 
@@ -89,7 +102,11 @@ You can set a custom message for release via `--notes` CLI option:
 - adds git tag with new version (and changelog message, if used)
 - pushes changes to github repo
 - if github token is present, publishes release to GitHub, named as `<repo> vx.x.x`
-- releases npm package by `npm publish` command
+- if `altPkgRootFolder` doesn't set it will just `npm publish` as usual
+  - otherwise if `altPkgRootFolder` set then this script
+    - will `npm publish` from the `altPkgRootFolder` folder
+    - with the custom version of `package.json` with removed `scripts` and `devDependencies`
+    - also it will remove the `altPkgRootFolder` part from the `main` file path
 - if `bowerRepo` field is present in the `package.json`, then it releases bower package:
   - clones bower repo to local `tmpBowerRepo` temp folder. `git clone bowerRepo tmpBowerRepo`
   - then it cleans up all but `.git` files in the `tmpBowerRepo`

src/release.js

@@ -38,6 +38,7 @@ const bowerRepo = configOptions.bowerRepo; // if it is not set, then there is no
 
 const githubToken = process.env.GITHUB_TOKEN;
 
+const altPkgRootFolder = configOptions.altPkgRootFolder;
 
 //------------------------------------------------------------------------------
 // command line options
@@ -256,7 +257,26 @@ function release({ type, preid }) {
     console.log('Package is private, skipping npm release'.yellow);
   } else {
     console.log('Releasing: '.cyan + 'npm package'.green);
-    safeRun('npm publish');
+
+    // publishing just /altPkgRootFolder content
+    if (altPkgRootFolder) {
+      // prepare custom `package.json` without `scripts` and `devDependencies`
+      // because it already has been saved, we safely can use the same object
+      delete npmjson.files; // because otherwise it would be wrong
+      delete npmjson.scripts;
+      delete npmjson.devDependencies;
+      delete npmjson['release-script']; // this also doesn't belong to output
+      const regexp = new RegExp(altPkgRootFolder + '\\/?');
+      npmjson.main = npmjson.main.replace(regexp, ''); // remove folder part from path
+      `${JSON.stringify(npmjson, null, 2)}\n`.to(path.join(altPkgRootFolder, 'package.json'));
+
+      pushd(altPkgRootFolder);
+      safeRun('npm publish');
+      popd();
+    } else {
+      safeRun('npm publish');
+    }
+
     console.log('Released: '.cyan + 'npm package'.green);
   }