mirror of
https://github.com/Luzifer/git-changerelease.git
synced 2024-10-18 14:14:20 +00:00
324 lines
7.6 KiB
Go
324 lines
7.6 KiB
Go
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package main
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//go:generate go-bindata -o assets.go assets/
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import (
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"bytes"
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"errors"
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"fmt"
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"html/template"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"regexp"
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"strconv"
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"strings"
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"time"
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"gopkg.in/yaml.v2"
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"github.com/Luzifer/rconfig"
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"github.com/mitchellh/go-homedir"
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)
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type semVerBump uint
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const (
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semVerBumpMinor semVerBump = iota
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semVerBumpPatch
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semVerBumpMajor
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)
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type commit struct {
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ShortHash string
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Subject string
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AuthorName string
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AuthorEmail string
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}
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func parseCommit(line string) (*commit, error) {
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t := strings.Split(line, "\t")
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if len(t) != 4 {
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return nil, errors.New("Unexpected line format")
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}
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return &commit{
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ShortHash: t[0],
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Subject: t[1],
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AuthorName: t[2],
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AuthorEmail: t[3],
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}, nil
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}
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type configFile struct {
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MatchPatch []string `yaml:"match_patch"`
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MatchMajor []string `yaml:"match_major"`
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}
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var (
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cfg = struct {
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ChangelogFile string `flag:"changelog" default:"History.md" description:"File to write the changelog to"`
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ConfigFile string `flag:"config" default:"~/.git_changerelease.yaml" description:"Location of the configuration file"`
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MkConfig bool `flag:"create-config" default:"false" description:"Copy an example configuration file to the location of --config"`
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NoEdit bool `flag:"no-edit" default:"false" description:"Do not open the $EDITOR to modify the changelog"`
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PreRelease string `flag:"pre-release" default:"" description:"Pre-Release information to append to the version (e.g. 'beta' or 'alpha.1')"`
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ReleaseMeta string `flag:"release-meta" default:"" description:"Release metadata to append to the version (e.g. 'exp.sha.5114f85' or '20130313144700')"`
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VersionAndExit bool `flag:"version" default:"false" description:"Prints current version and exits"`
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}{}
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config configFile
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version = "dev"
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)
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func init() {
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if err := rconfig.Parse(&cfg); err != nil {
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log.Fatalf("Unable to parse commandline options: %s", err)
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}
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if ecfg, err := homedir.Expand(cfg.ConfigFile); err != nil {
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log.Fatalf("Unable to parse config path: %s", err)
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} else {
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cfg.ConfigFile = ecfg
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}
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if cfg.VersionAndExit {
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fmt.Printf("git-changerelease %s\n", version)
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os.Exit(0)
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}
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if cfg.MkConfig {
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data, _ := Asset("assets/git_changerelease.yaml")
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ioutil.WriteFile(cfg.ConfigFile, data, 0600)
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log.Printf("Wrote an example configuration to %s", cfg.ConfigFile)
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os.Exit(0)
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}
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if !cfg.NoEdit && os.Getenv("EDITOR") == "" {
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log.Fatalf("You chose to open the changelog in the editor but there is no $EDITOR in your env")
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}
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if err := loadConfig(); err != nil {
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log.Fatalf("Unable to load config file: %s", err)
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}
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}
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func loadConfig() error {
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if _, err := os.Stat(cfg.ConfigFile); err != nil {
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return errors.New("Config file does not exist, use --create-config to create one")
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}
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data, err := ioutil.ReadFile(cfg.ConfigFile)
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if err != nil {
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return err
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}
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return yaml.Unmarshal(data, &config)
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}
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func git(stderrEnabled bool, args ...string) (string, error) {
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buf := bytes.NewBuffer([]byte{})
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cmd := exec.Command("git", args...)
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cmd.Stdout = buf
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if stderrEnabled {
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cmd.Stderr = os.Stderr
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}
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err := cmd.Run()
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return strings.TrimSpace(buf.String()), err
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}
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func gitErr(args ...string) (string, error) {
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return git(true, args...)
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}
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func gitSilent(args ...string) (string, error) {
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return git(false, args...)
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}
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func doSemVerBump(previousVersion string, bumpType semVerBump) (string, error) {
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previousVersion = strings.Split(previousVersion, "-")[0] // Don't care about pre-release / meta-data
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previousVersion = strings.TrimLeft(previousVersion, "v")
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elements := strings.Split(previousVersion, ".")
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major, err := strconv.Atoi(elements[0])
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if err != nil {
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return "", err
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}
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minor, err := strconv.Atoi(elements[1])
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if err != nil {
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return "", err
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}
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patch, err := strconv.Atoi(elements[2])
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if err != nil {
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return "", err
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}
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switch bumpType {
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case semVerBumpPatch:
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patch += 1
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case semVerBumpMinor:
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patch = 0
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minor += 1
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case semVerBumpMajor:
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patch = 0
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minor = 0
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major += 1
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}
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nextVer := []string{strings.Join([]string{
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strconv.Itoa(major),
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strconv.Itoa(minor),
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strconv.Itoa(patch),
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}, ".")}
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if cfg.PreRelease != "" {
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nextVer = append(nextVer, "-"+cfg.PreRelease)
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}
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if cfg.ReleaseMeta != "" {
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nextVer = append(nextVer, "+"+cfg.ReleaseMeta)
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}
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return strings.Join(nextVer, ""), nil
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}
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func selectBumpType(logs []commit) (semVerBump, error) {
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bump := semVerBumpMinor
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matchers := map[*regexp.Regexp]semVerBump{}
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for _, m := range config.MatchPatch {
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r, err := regexp.Compile(m)
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if err != nil {
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return 0, err
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}
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matchers[r] = semVerBumpPatch
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}
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for _, m := range config.MatchMajor {
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r, err := regexp.Compile(m)
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if err != nil {
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return 0, err
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}
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matchers[r] = semVerBumpMajor
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}
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for _, l := range logs {
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for m, t := range matchers {
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if m.MatchString(l.Subject) && t > bump {
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bump = t
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}
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}
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}
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return bump, nil
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}
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func readChangelog() string {
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var changelog string
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if _, err := os.Stat(cfg.ChangelogFile); err == nil {
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d, err := ioutil.ReadFile(cfg.ChangelogFile)
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if err != nil {
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log.Fatalf("Unable to read old changelog: %s", err)
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}
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changelog = string(d)
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}
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return changelog
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}
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func main() {
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// Get last tag
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lastTag, err := gitSilent("describe", "--tags", "--abbrev=0")
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// Fetch logs since last tag / since repo start
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logArgs := []string{"log", `--format=%h%x09%s%x09%an%x09%ae`, "--abbrev-commit"}
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if err == nil {
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logArgs = append(logArgs, fmt.Sprintf("%s..HEAD", lastTag))
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} else {
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lastTag = "0.0.0"
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}
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rawLogs, err := gitErr(logArgs...)
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if err != nil {
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log.Fatalf("Unable to read git log entries: %s", err)
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}
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logs := []commit{}
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for _, l := range strings.Split(rawLogs, "\n") {
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if l == "" {
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continue
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}
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pl, err := parseCommit(l)
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if err != nil {
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log.Fatalf("Git used an unexpected log format.")
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}
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logs = append(logs, *pl)
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}
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if len(logs) == 0 {
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log.Printf("Found no changes since last tag, stopping now.")
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return
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}
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// Tetermine increase type
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semVerBumpType, err := selectBumpType(logs)
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if err != nil {
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log.Fatalf("Could not determine how to increase the version: %s", err)
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}
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// Generate new version
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newVersion, err := doSemVerBump(lastTag, semVerBumpType)
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if err != nil {
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log.Fatalf("Was unable to increase the version: %s", err)
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}
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// Render log
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rawTpl, _ := Asset("assets/log_template.md")
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tpl, err := template.New("log_template").Parse(string(rawTpl))
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if err != nil {
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log.Fatalf("Unable to parse log template: %s", err)
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}
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buf := bytes.NewBuffer([]byte{})
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tpl.Execute(buf, map[string]interface{}{
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"NextVersion": newVersion,
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"Now": time.Now(),
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"LogLines": logs,
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"OldLog": readChangelog(),
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})
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if err := ioutil.WriteFile(cfg.ChangelogFile, buf.Bytes(), 0644); err != nil {
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log.Fatalf("Unable to write new changelog: %s", err)
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}
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// Spawning editor
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if !cfg.NoEdit {
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editor := exec.Command(os.Getenv("EDITOR"), cfg.ChangelogFile)
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editor.Stdin = os.Stdin
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editor.Stdout = os.Stdout
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editor.Stderr = os.Stderr
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if err := editor.Run(); err != nil {
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log.Fatalf("Editor ended with non-zero status, stopping here.")
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}
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}
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// Read back version from changelog file
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changelog := strings.Split(readChangelog(), "\n")
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if len(changelog) < 1 {
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log.Fatalf("Changelog is empty, no way to read back the version.")
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}
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newVersion = strings.Split(changelog[0], " ")[1]
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// Write the tag
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if _, err := gitErr("add", cfg.ChangelogFile); err != nil {
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log.Fatalf("Unable to add changelog file: %s", err)
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}
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if _, err := gitErr("commit", "-m", "Prepared release v"+newVersion); err != nil {
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log.Fatalf("Unable to commit changelog: %s", err)
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}
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if _, err := gitErr("tag", "-s", "-m", "v"+newVersion, "v"+newVersion); err != nil {
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log.Fatalf("Unable to tag release: %s", err)
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}
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}
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