init project

.gitignore

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+changelog

README.md

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+[简体中文](https://github.com/go-gitea/gitea/blob/master/README_ZH.md)
+
+# Changelog - Generate changelog of gitea repository
+
+[![Build Status](https://drone.gitea.io/api/badges/go-gitea/changelog/status.svg)](https://drone.gitea.io/go-gitea/changelog)
+
+## Purpose
+
+This repo currently is part of Gitea. The purpose it to generate changelog when writing release notes. If a project management like Gitea, it could use this tool, otherwise please find another. The tool generate changelog depends on your PRs on the milestone and the labels of a PR.
+
+## Installation
+
+```
+go get github.com/go-gitea/changelog
+```
+
+## Configuration
+
+See the [changelog.yml.example](changelog.yml.example) example file.
+
+## Usage
+
+```
+changelog -m=1.2.0 -c=/path/to/my_config_file
+```
+
+## Contributing
+
+Fork -> Patch -> Push -> Pull Request
+
+## Authors
+
+* [Maintainers](https://github.com/orgs/go-gitea/people)
+* [Contributors](https://github.com/go-gitea/gitea/graphs/contributors)
+* [Translators](options/locale/TRANSLATORS)
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](https://github.com/go-gitea/gitea/blob/master/LICENSE) file for the full license text.

changelog.yml.example

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+repo: go-gitea/gitea
+groups:
+  - 
+    name: BREAKING
+    labels:
+      - kind/breaking
+  - 
+    name: FEATURE
+    labels:
+      - kind/feature
+  -
+    name: BUGFIXES
+    labels:
+      - kind/bug
+  - 
+    name: ENHANCEMENT
+    labels:
+      - kind/enhancement
+      - kind/refactor
+      - kind/ui
+  -
+    name: SECURITY
+    labels:
+      - kind/security
+  - 
+    name: TESTING
+    labels:
+      - kind/testing
+  - 
+    name: TRANSLATION
+    labels:
+      - kind/translation
+  - 
+    name: BUILD
+    labels:
+      - kind/build
+      - kind/lint
+  - 
+    name: DOCS
+    labels:
+    - kind/docs
+  - 
+    name: MISC
+    default: true

main.go

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+package main
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"time"
+
+	"github.com/go-yaml/yaml"
+	"github.com/google/go-github/github"
+	"github.com/urfave/cli"
+)
+
+const (
+	// Version of changelog
+	Version = "0.1"
+)
+
+func main() {
+	app := cli.NewApp()
+	app.Name = "changelog"
+	app.Usage = "Generate changelog of gitea repository"
+	app.Version = Version
+	app.Commands = []cli.Command{
+		cmdGenerate,
+	}
+	err := app.Run(os.Args)
+	if err != nil {
+		log.Fatal(4, "Failed to run app with %s: %v", os.Args, err)
+	}
+}
+
+var cmdGenerate = cli.Command{
+	Name:        "generate",
+	Usage:       "generate changelog of gitea repository",
+	Description: `generate changelog of gitea repository`,
+	Action:      runGenerate,
+	Flags: []cli.Flag{
+		cli.StringFlag{
+			Name:  "milestone, m",
+			Usage: "Generate which tag from",
+		},
+		cli.StringFlag{
+			Name:  "config, c",
+			Usage: "Specify a config file",
+		},
+	},
+}
+
+type Config struct {
+	Repo   string `yml:"repo"`
+	Groups []struct {
+		Name    string   `yml:"name"`
+		Labels  []string `yml:"labels"`
+		Default bool     `yml:"default"`
+	}
+}
+
+var (
+	defaultConfig = []byte(`repo: go-gitea/gitea
+groups:
+  - 
+    name: BREAKING
+    labels:
+      - kind/breaking
+  - 
+    name: FEATURE
+    labels:
+      - kind/feature
+  -
+    name: BUGFIXES
+    labels:
+      - kind/bug
+  - 
+    name: ENHANCEMENT
+    labels:
+      - kind/enhancement
+      - kind/refactor
+  -
+    name: SECURITY
+    labels:
+      - kind/security
+  - 
+    name: TESTING
+    labels:
+      - kind/testing
+  - 
+    name: TRANSLATION
+    labels:
+      - kind/translation
+  - 
+    name: BUILD
+    labels:
+      - kind/build
+      - kind/lint
+  - 
+    name: DOCS
+    labels:
+    - kind/docs
+  - 
+    name: MISC
+    default: true`)
+)
+
+func runGenerate(cmd *cli.Context) {
+	milestone := cmd.String("milestone")
+	if milestone == "" {
+		fmt.Println("Please specify a milestone")
+		return
+	}
+
+	var err error
+	var configContent []byte
+	if cmd.String("config") == "" {
+		configContent = defaultConfig
+	} else {
+		configContent, err = ioutil.ReadFile(cmd.String("config"))
+		if err != nil {
+			fmt.Printf("Load config from file %s failed: %v\n", cmd.String("config"), err)
+			return
+		}
+	}
+
+	var config Config
+	err = yaml.Unmarshal(configContent, &config)
+	if err != nil {
+		fmt.Printf("Unmarshal config content failed: %v\n", err)
+		return
+	}
+
+	client := github.NewClient(nil)
+	ctx := context.Background()
+
+	var labels = make(map[string]string)
+	var changelogs = make(map[string][]github.Issue)
+	for _, g := range config.Groups {
+		changelogs[g.Name] = []github.Issue{}
+		for _, l := range g.Labels {
+			labels[l] = g.Name
+		}
+	}
+
+	var query = fmt.Sprintf(`repo:%s is:merged milestone:"%s"`, config.Repo, milestone)
+	var p = 1
+	var perPage = 100
+	for {
+		result, _, err := client.Search.Issues(ctx, query, &github.SearchOptions{
+			ListOptions: github.ListOptions{
+				Page:    p,
+				PerPage: perPage,
+			},
+		})
+		p++
+		if err != nil {
+			log.Fatal(err.Error())
+		}
+
+		for _, pr := range result.Issues {
+			var found bool
+			for _, lb := range pr.Labels {
+				if g, ok := labels[lb.GetName()]; ok {
+					changelogs[g] = append(changelogs[g], pr)
+					found = true
+					break
+				}
+			}
+			if !found {
+				changelogs["MISC"] = append(changelogs["MISC"], pr)
+			}
+		}
+
+		if len(result.Issues) != perPage {
+			break
+		}
+	}
+
+	fmt.Printf("## [%s](https://github.com/%s/releases/tag/v%s) - %s\n", config.Repo, milestone, milestone, time.Now().Format("2006-01-02"))
+	for _, g := range config.Groups {
+		fmt.Println("* " + g.Name)
+		for _, pr := range changelogs[g.Name] {
+			fmt.Printf("  * %s (#%d)\n", *pr.Title, *pr.Number)
+		}
+	}
+}