Add appveyor support (#75)

* Add appveyor build badge

scripts/prepare-release.ts

@@ -0,0 +1,66 @@
+import * as fs from 'fs-extra'
+import * as path from 'path'
+import { spawn, ChildProcess } from 'child_process'
+import { chdir } from 'process'
+
+async function exec(cmd: string, args: string[] = []) {
+  const child = spawn(cmd, args, { shell: true })
+  redirectOutputFor(child)
+  await waitFor(child)
+}
+
+function redirectOutputFor(child: ChildProcess) {
+  const printStdout = (data: Buffer) => {
+    process.stdout.write(data.toString())
+  }
+  const printStderr = (data: Buffer) => {
+    process.stderr.write(data.toString())
+  }
+  child.stdout.on('data', printStdout)
+  child.stderr.on('data', printStderr)
+
+  child.once('close', () => {
+    child.stdout.off('data', printStdout)
+    child.stderr.off('data', printStderr)
+  })
+}
+
+async function waitFor(child: ChildProcess) {
+
+  return new Promise((resolve) => {
+    child.once('close', () => resolve())
+  })
+}
+
+const targetDir = path.join('build', 'clean')
+async function prepareRelease() {
+  const originalDir = __dirname
+  await fs.remove(targetDir)
+  await fs.mkdirp(targetDir)
+
+  // Create fresh clone of the local git repo
+  await exec('git', ['clone', '.git', targetDir])
+
+  // Enter git repo
+  chdir(targetDir)
+
+  // Install app dependencies
+  chdir('app')
+  await exec('yarn')
+  chdir('..')
+
+  // Install electron dependencies
+  await exec('yarn')
+
+  // Build App and Electron backend
+  await exec('yarn', ['build'])
+
+  // Clean up
+  await fs.remove('node_modules')
+  await exec('yarn', ['install', '--production'])
+  await fs.remove(path.join('app', 'node_modules'))
+
+  chdir(originalDir)
+}
+
+prepareRelease()