Github action for releases

.github/workflows/release.yml

@@ -0,0 +1,37 @@
+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+      - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10
+
+# TODO: also publish the dist
+name: Create Release
+
+jobs:
+  build:
+    name: Create Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Go 1.13.6
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.13.6
+      - name: Checkout code
+        uses: actions/checkout@master
+      - name: Get release notes
+        id: release-notes
+        run: |
+          go run ./script/issue-command/main.go set-output \
+            --name=body \
+            "$(go run ./script/release-changelog/main.go)"
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          body: "${{ steps.release-notes.outputs.body }}"
+          draft: true
+          prerelease: false

script/issue-command/main.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func escapeData(data string) string {
+	data = strings.ReplaceAll(data, "%", "%25")
+	data = strings.ReplaceAll(data, "\r", "%0D")
+	data = strings.ReplaceAll(data, "\n", "%0A")
+	return data
+}
+
+func escapeProperty(prop string) string {
+	prop = escapeData(prop)
+	prop = strings.ReplaceAll(prop, ":", "%3A")
+	prop = strings.ReplaceAll(prop, ",", "%2C")
+	return prop
+}
+
+// Go implementation of
+// https://github.com/actions/toolkit/blob/master/packages/core/src/command.ts
+func main() {
+	var remain []string
+	var props []string
+
+	for _, arg := range os.Args[1:] {
+		if arg == "--" {
+			continue
+		}
+		if strings.HasPrefix(arg, "--") {
+			kv := strings.SplitN(arg[2:], "=", 2)
+			if len(kv) != 2 {
+				panic(fmt.Sprintf("expected %s to be of form --key=value", arg[2:]))
+			}
+			props = append(props, fmt.Sprintf("%s=%s", kv[0], escapeProperty(kv[1])))
+		} else {
+			remain = append(remain, arg)
+		}
+	}
+
+	if len(remain) != 2 {
+		panic(fmt.Sprintf("expected 2 remaining arguments, go %v", remain))
+	}
+
+	cmd := remain[0]
+	msg := escapeData(remain[1])
+	var propStr string
+	if len(props) > 0 {
+		propStr = " " + strings.Join(props, ",")
+	}
+
+	fmt.Printf("::%s%s::%s", cmd, propStr, msg)
+}

script/release-changelog/main.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"bufio"
+	"os"
+	"strings"
+)
+
+func run() error {
+	headers := 0
+
+	f, err := os.Open("CHANGELOG.md")
+	if err != nil {
+		return err
+	}
+
+	r := bufio.NewReader(f)
+
+	prev, err := r.ReadString('\n')
+	if err != nil {
+		return err
+	}
+
+	for {
+		line, err := r.ReadString('\n')
+		if err != nil {
+			return err
+		}
+		if strings.HasPrefix(line, "======") {
+			headers++
+		}
+		if headers > 1 {
+			return nil
+		}
+
+		os.Stdout.WriteString(prev)
+		prev = line
+	}
+}
+
+func main() {
+	err := run()
+	if err != nil {
+		panic(err)
+	}
+}