feat: rough porting from python

a fast and rough porting version,
from python to go.

Author: JayceChant

commit-msg.go

@@ -0,0 +1,143 @@
+package main
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"regexp"
+	"strings"
+)
+
+const (
+	MERGE_PATTERN  = `^Merge `
+	HEADER_PATTERN = `^((fixup! |squash! )?(\w+)(?:\(([^\)\s]+)\))?: (.+))(?:\n|$)`
+	LINE_LIMIT     = 100
+	BODY_REQUIRED  = false
+)
+
+var (
+	typeList = [...]string{
+		"feat",     // 新功能（feature）
+		"fix",      // 修补bug
+		"docs",     // 文档（documentation）
+		"style",    // 格式（不影响代码运行的变动）
+		"refactor", // 重构（既不是新增功能，也不是修改bug的代码变动）
+		"perf",     // 提升性能（performance）
+		"test",     // 增加测试
+		"chore",    // 构建过程或辅助工具的变动'
+		"revert",   // 撤销以前的 commit
+		"Revert"}   // 有些版本的工具生成的revert message首字母大写
+)
+
+func getMsg(path string) string {
+	if path == "" {
+		log.Fatalln("Arg missing.")
+	}
+
+	f, err := os.Stat(path)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	if f.IsDir() {
+		log.Fatalln(path, "is not a file.")
+	}
+
+	buf, err := ioutil.ReadFile(path)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	return string(buf)
+}
+
+func checkEmpty(str string) bool {
+	return strings.TrimSpace(str) == ""
+}
+
+func checkType(type_ string) {
+	for _, t := range typeList {
+		if type_ == t {
+			return
+		}
+	}
+	log.Fatalln("Wrong type.")
+}
+
+func checkHeader(header string) {
+	if checkEmpty(header) {
+		log.Fatalln("Empty header.")
+	}
+
+	re := regexp.MustCompile(HEADER_PATTERN)
+	groups := re.FindStringSubmatch(header)
+
+	isFixupOrSquash := (groups[2] != "")
+
+	type_ := groups[3]
+	// scope = groups[4] // TODO: 根据配置对scope检查
+	// subject = (groups[5] != "") // TODO: 根据规则对subject检查
+	checkType(type_)
+
+	length := len(header)
+	if length > LINE_LIMIT && !(isFixupOrSquash || type_ == "revert") {
+		log.Fatalln("Line overlong.")
+	}
+}
+
+func checkBody(body string) {
+	if checkEmpty(body) {
+		if BODY_REQUIRED {
+			log.Fatalln("Empty body.")
+		} else {
+			return
+		}
+	}
+
+	if !checkEmpty(strings.SplitN(body, "\n", 2)[0]) {
+		log.Fatalln("Blank line lacking between header and body.")
+	}
+
+	for _, line := range strings.Split(body, "\n") {
+		if len(line) > LINE_LIMIT {
+			log.Fatalln("Line overlong.")
+		}
+	}
+}
+
+func validateMsg(msg string) {
+	msg = strings.TrimSpace(msg)
+	if msg == "" {
+		log.Fatalln("Empty Message.")
+	}
+
+	isMerge, err := regexp.MatchString(MERGE_PATTERN, msg)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	if isMerge {
+		log.Println("Merge message, skip check.")
+		os.Exit(0)
+	}
+
+	sections := strings.SplitN(msg, "\n", 2)
+	checkHeader(sections[0])
+
+	if len(sections) == 2 {
+		checkBody(sections[1])
+	} else if BODY_REQUIRED {
+		log.Fatalln("Body missing. Maybe a new line is lacking.")
+	}
+}
+
+func main() {
+	msgFile := ""
+	if len(os.Args) > 1 {
+		msgFile = os.Args[1]
+	}
+
+	msg := getMsg(msgFile)
+
+	validateMsg(msg)
+}