added release.mjs script and release.yml gh action (#75)

.github/workflows/release.yml

@@ -0,0 +1,34 @@
+# Very important!
+# Make sure that the github token has read AND WRITE access on github.
+#   1. hit https://github.com/seatsio/[REPO]/settings/actions
+#   2. under "Workflow permissions", make sure "Read and write permissions" is checked instead of the (default?) read only.
+#
+
+name: Release
+run-name: Release ${{ github.repository }}
+on:
+  workflow_dispatch:
+    inputs:
+      versionToBump:
+        description: 'The version to bump. Major for incompatible API changes, minor for adding BC features'
+        required: true
+        type: choice
+        options:
+          - minor
+          - major
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: fregante/setup-git-user@v2
+      - id: install-zx
+        run: npm i -g zx
+      - id: install-semver-tool
+        run: |
+          wget -O /usr/local/bin/semver https://raw.githubusercontent.com/fsaintjacques/semver-tool/master/src/semver
+          chmod +x /usr/local/bin/semver
+      - run: zx ./release.mjs -v $VERSION_TO_BUMP
+        env:
+          VERSION_TO_BUMP: ${{ inputs.versionToBump }}
+          GH_TOKEN: ${{ github.token }}

release.mjs

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+#!/usr/bin/env zx
+
+/*
+* Script to release the seats.io java lib.
+*   - changes the version number in README.md
+*   - changes the version number in build.gradle
+*   - creates the release in Gihub (using gh cli)
+*
+*
+* Prerequisites:
+*   - zx installed (https://github.com/google/zx)
+*   - gh cli installed (https://cli.github.com/)
+*   - semver cli installed (https://github.com/fsaintjacques/semver-tool)
+*
+* Usage:
+*   zx ./release.mjs -v major/minor -n "release notes"
+* */
+
+// don't output the commands themselves
+$.verbose = false
+
+const versionToBump = getVersionToBump()
+const latestVersion = await fetchLatestReleasedVersionNumber()
+
+await pullLastVersion().then(release)
+
+function getVersionToBump() {
+    if (!argv.v || !(argv.v === 'minor' || argv.v === 'major')) {
+        throw new Error ("Please specify -v major/minor")
+    }
+    return argv.v
+}
+
+function removeLeadingV(tagName) {
+    if (tagName.startsWith('v')) {
+        return tagName.substring(1)
+    }
+    return tagName
+}
+
+async function fetchLatestReleasedVersionNumber() {
+    let result = await $`gh release view --json tagName`
+    let tagName = JSON.parse(result).tagName
+    return removeLeadingV(tagName)
+}
+
+async function determineNextVersionNumber(previous) {
+    return (await $`semver bump ${versionToBump} ${previous}`).stdout.trim()
+}
+
+async function pullLastVersion() {
+    await $`git checkout master`
+    await $`git pull origin master`
+}
+
+async function release() {
+    const nextVersion = await determineNextVersionNumber(latestVersion)
+    const newTag = 'v' + nextVersion
+    return await $`gh release create ${newTag} --generate-notes`.catch(error => {
+        console.error('something went wrong while creating the release. Please revert the version change!')
+        throw error
+    })
+}