feat: create release command

cmd/release/main.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"regexp"
+	"strings"
+	"time"
+
+	"github.com/Masterminds/semver/v3"
+)
+
+const (
+	changelogSource = "CHANGELOG.md"
+	changelogTarget = "docs/docs/changelog.md"
+)
+
+const changelogTemplate = `---
+slug: /changelog/
+sidebar_position: 7
+---`
+
+var (
+	changelogReleaseRegex = regexp.MustCompile(`## Unreleased`)
+	changelogUserRegex    = regexp.MustCompile(`@(\w+)`)
+	changelogIssueRegex   = regexp.MustCompile(`#(\d+)`)
+)
+
+func main() {
+	if err := release(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func release() error {
+	if len(os.Args) != 2 {
+		return errors.New("error: expected version number")
+	}
+
+	version, err := getVersion()
+	if err != nil {
+		return err
+	}
+
+	if err := bumpVersion(version, os.Args[1]); err != nil {
+		return err
+	}
+
+	fmt.Println(version)
+
+	if err := changelog(version); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func getVersion() (*semver.Version, error) {
+	cmd := exec.Command("git", "describe", "--tags", "--abbrev=0")
+	b, err := cmd.Output()
+	if err != nil {
+		return nil, err
+	}
+
+	return semver.NewVersion(strings.TrimSpace(string(b)))
+}
+
+func bumpVersion(version *semver.Version, verb string) error {
+	switch verb {
+	case "major":
+		*version = version.IncMajor()
+	case "minor":
+		*version = version.IncMinor()
+	case "patch":
+		*version = version.IncPatch()
+	default:
+		*version = *semver.MustParse(verb)
+	}
+	return nil
+}
+
+func changelog(version *semver.Version) error {
+	// Open changelog source file
+	b, err := os.ReadFile(changelogSource)
+	if err != nil {
+		panic(err)
+	}
+	changelog := string(b)
+	date := time.Now().Format("2006-01-02")
+
+	// Replace "Unreleased" with the new version and date
+	changelog = changelogReleaseRegex.ReplaceAllString(changelog, fmt.Sprintf("## v%s - %s", version, date))
+
+	// Write the changelog to the source file
+	if err := os.WriteFile(changelogSource, []byte(changelog), 0644); err != nil {
+		panic(err)
+	}
+
+	// Add the frontmatter to the changelog
+	changelog = fmt.Sprintf("%s\n\n%s", changelogTemplate, changelog)
+
+	// Replace @user and #issue with full links
+	changelog = changelogUserRegex.ReplaceAllString(changelog, "[@$1](https://github.com/$1)")
+	changelog = changelogIssueRegex.ReplaceAllString(changelog, "[#$1](https://github.com/go-task/task/issues/$1)")
+
+	// Write the changelog to the target file
+	if err := os.WriteFile(changelogTarget, []byte(changelog), 0644); err != nil {
+		panic(err)
+	}
+
+	return nil
+}