feat: initial implementation

.editorconfig

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+root = true
+
+[*]
+
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitignore

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+node_modules
+*.log
+*.dump
+*.swp
+.DS_Store
+.nyc_output

.travis.yml

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+sudo: false
+language: node_js
+cache:
+  directories:
+  - node_modules
+notifications:
+  email: false
+node_js:
+  - 6
+  - 4
+  - '0.12'
+before_script:
+  - npm prune
+after_success:
+  - 'curl -Lo travis_after_all.py https://git.io/travis_after_all'
+  - python travis_after_all.py
+  - 'export $(cat .to_export_back) &> /dev/null'
+  - npm run semantic-release
+branches:
+  except:
+    - "/^v\\d+\\.\\d+\\.\\d+$/"

README.md

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+# @greenkeeper/rc
+
+[![Build Status](https://travis-ci.org/greenkeeperio/rc.svg?branch=master)](https://travis-ci.org/greenkeeperio/rc)
+[![Dependency Status](https://david-dm.org/greenkeeperio/rc/master.svg)](https://david-dm.org/greenkeeperio/rc/master)
+[![devDependency Status](https://david-dm.org/greenkeeperio/rc/master/dev-status.svg)](https://david-dm.org/greenkeeperio/rc/master#info=devDependencies)
+[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](https://github.com/feross/standard)
+[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
+
+`get`, `set`, `unset`, `replace` or `merge` Greenkeeper config and persist it to a `.greenkeeperrc` file in the homedir.

index.js

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+var fs = require('fs')
+var path = require('path')
+
+var _ = require('lodash')
+var home = require('os-homedir')
+
+var configPath = path.join(home(), '.greenkeeperrc')
+
+var config
+
+try {
+  config = JSON.parse(fs.readFileSync(configPath))
+} catch (e) {
+  config = {}
+}
+
+exports.get = function (name) {
+  return name
+    ? config[name]
+    : config
+}
+
+exports.set = function (name, value) {
+  config[name] = value
+  exports._save()
+}
+
+exports.unset = function (name) {
+  delete config[name]
+  exports._save()
+}
+
+exports.replace = function (newConfig) {
+  config = newConfig
+  exports._save()
+}
+
+exports.merge = function (newConfig) {
+  _.merge(config, newConfig)
+  exports._save()
+}
+
+exports._save = function () {
+  fs.writeFileSync(configPath, JSON.stringify(config, null, 2))
+}

package.json

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+{
+  "name": "@greenkeeper/rc",
+  "description": "CRUD for .greenkeeperrc file",
+  "author": "Stephan Bönnemann <[email protected]> (http://boennemann.me)",
+  "bugs": {
+    "url": "https://github.com/greenkeeperio/rc/issues"
+  },
+  "dependencies": {
+    "lodash": "^4.11.1",
+    "os-homedir": "^1.0.1"
+  },
+  "devDependencies": {
+    "standard": "^6.0.8",
+    "semantic-release": "^4.3.5"
+  },
+  "homepage": "https://greenkeeper.io",
+  "license": "Apache-2.0",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/greenkeeperio/rc.git"
+  },
+  "scripts": {
+    "test": "standard",
+    "semantic-release": "semantic-release pre && npm publish && semantic-release post"
+  },
+  "publishConfig": {
+    "access": "public"
+  }
+}