feat(coverage): add codecov to coverage providers

Coveralls is the default, you can select codecov in your package.json
file by adding `--provider=codecov` to the `coverage-publish` script.

bin/coverage

@@ -4,23 +4,45 @@
 
 const gulp = require('gulp')
 const coveralls = require('coveralls')
+const codecov = require('codecov/lib/codecov').upload
 const fs = require('fs')
 const path = require('path')
 const args = require('args-parser')(process.argv)
 
 require('../src/gulp-log')(gulp)
 require('../gulp')(gulp, ['coverage'])
 
-if (args.publish) {
+const handlers = {
+  coveralls: (coverFile) => {
+    const input = fs.readFileSync(coverFile)
+    coveralls.handleInput(input.toString(), (err) => {
+      if (err) {
+        throw err
+      }
+
+      console.log('Finished uploading coveralls report')
   // ./node_modules/.bin/coveralls --verbose < coverage/lcov.info
-  const input = fs.readFileSync(path.join(process.cwd(), 'coverage', 'lcov.info'))
-  coveralls.handleInput(input.toString(), (err) => {
-    if (err) {
-      throw err
-    }
+    })
+  },
+  codecov: (coverFile) => {
+    codecov({options: {
+      file: coverFile,
+      disable: 'search'
+    }})
+  }
+}
+
+if (args.publish) {
+  const provider = args.provider || 'coveralls'
+  const handler = handlers[provider]
+  if (handler === undefined) {
+    const msg = 'no such coverage report provider: ' + provider
+    console.log(msg)
+    throw new Error(msg)
+  }
 
-    console.log('Finished uploading coveralls report')
-  })
+  const coverFile = path.join(process.cwd(), 'coverage', 'lcov.info')
+  handler(coverFile)
 } else {
   gulp.start('coverage')
 }

package.json

@@ -33,6 +33,7 @@
     "browserify-zlib-next": "^1.0.0",
     "chalk": "^1.1.3",
     "clean-documentation-theme": "^0.4.2",
+    "codecov": "^1.0.1",
     "conventional-github-releaser": "^1.1.3",
     "coveralls": "^2.11.15",
     "detect-node": "^2.0.3",
@@ -99,4 +100,4 @@
     "greenkeeperio-bot <support@greenkeeper.io>",
     "npmcdn-to-unpkg-bot <npmcdn-to-unpkg-bot@users.noreply.github.com>"
   ]
-}
+}