Add init command (#33)

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: jolheiser <john.olheiser@gmail.com>
Reviewed-on: https://gitea.com/gitea/changelog/pulls/33
Reviewed-by: 6543 <6543@noreply.gitea.io>
Reviewed-by: Guillermo Prandi <guillep2k@noreply.gitea.io>

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## [0.1.0](https://gitea.com/gitea/changelog/pulls?q=&type=all&state=closed&milestone=1231) - 2020-01-25
 * FEATURES
+  * Add init command (#33)
   * Add subcommand to display contributors of milestone (#10)
 * BUGFIXES
   * Fix README about import path (#22)

changelog.example.go

@@ -22,7 +22,7 @@ const (
 package config
 
 func init() {
-	defaultConfig = []byte(` + "`" + `%s` + "`" + `)
+	DefaultConfig = []byte(` + "`" + `%s` + "`" + `)
 }
 `
 )

cmd/init.go

@@ -0,0 +1,46 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package cmd
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"code.gitea.io/changelog/config"
+
+	"github.com/urfave/cli/v2"
+)
+
+var (
+	Init = &cli.Command{
+		Name:  "init",
+		Usage: "Initialize a default .changelog.yml",
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:        "name",
+				Aliases:     []string{"n"},
+				Usage:       "Name of the changelog config",
+				Value:       ".changelog.yml",
+				Destination: &nameFlag,
+			},
+		},
+		Action: runInit,
+	}
+	nameFlag string
+)
+
+func runInit(cmd *cli.Context) error {
+	if _, err := os.Stat(nameFlag); err == nil {
+		return fmt.Errorf("file '%s' already exists", nameFlag)
+	}
+
+	if err := ioutil.WriteFile(nameFlag, config.DefaultConfig, os.ModePerm); err != nil {
+		return err
+	}
+
+	fmt.Printf("Config initialized at '%s'\n", nameFlag)
+	return nil
+}

config/config.go

@@ -11,7 +11,7 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
-var defaultConfig []byte
+var DefaultConfig []byte
 
 // Group is a grouping of PRs
 type Group struct {
@@ -35,7 +35,7 @@ func New(configPath string) (*Config, error) {
 	var err error
 	var configContent []byte
 	if len(configPath) == 0 {
-		configContent = defaultConfig
+		configContent = DefaultConfig
 	} else {
 		configContent, err = ioutil.ReadFile(configPath)
 		if err != nil {

config/config_default.go

@@ -5,7 +5,7 @@
 package config
 
 func init() {
-	defaultConfig = []byte(`# The full repository name
+	DefaultConfig = []byte(`# The full repository name
 repo: go-gitea/gitea
 
 # Service type (gitea or github)

main.go

@@ -12,6 +12,7 @@ import (
 	"os"
 
 	"code.gitea.io/changelog/cmd"
+
 	"github.com/urfave/cli/v2"
 )
 
@@ -30,7 +31,6 @@ func main() {
 				Name:        "milestone",
 				Aliases:     []string{"m"},
 				Usage:       "Targeted milestone",
-				Required:    true,
 				Destination: &cmd.MilestoneFlag,
 			},
 			&cli.StringFlag{
@@ -61,6 +61,7 @@ func main() {
 		Commands: []*cli.Command{
 			cmd.Generate,
 			cmd.Contributors,
+			cmd.Init,
 		},
 	}