changelog-entry: allow customizing allowed types (#33)

Author: dadgar

cmd/changelog-entry/README.md

@@ -23,6 +23,25 @@ $ changelog-entry -type improvement -subcategory monitoring -description "optimi
 
 If parameters are missing the command will prompt to fill them, the pull request number is optional and if not provided the command will try to guess it based on the current branch name and remote if the current directory is in a git repository.
 
+### Customizing the allowed types
+
+To customize the types that will be displayed in the prompt, create a line
+delimited file with the types are allow and pass it as the `-allowed-types-file`
+flag.
+
+As an example, to allow only `bug` and `enhancement` types, create a file with the following content:
+
+```sh
+bug
+enhancement
+```
+
+Then pass it to the command:
+
+```sh
+$ changelog-entry -allowed-types-file=types.txt
+```
+
 ## Output
 
 ``````markdown

cmd/changelog-entry/main.go

@@ -10,15 +10,16 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-	"github.com/go-git/go-git/v5"
-	"github.com/google/go-github/github"
-	"github.com/hashicorp/go-changelog"
-	"github.com/manifoldco/promptui"
 	"os"
 	"path"
 	"regexp"
 	"strings"
 	"text/template"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/google/go-github/github"
+	"github.com/hashicorp/go-changelog"
+	"github.com/manifoldco/promptui"
 )
 
 //go:embed changelog-entry.tmpl
@@ -43,7 +44,7 @@ func main() {
 		fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
 	}
-	var subcategory, changeType, description, changelogTmpl, dir, url string
+	var subcategory, changeType, description, changelogTmpl, dir, url, allowedTypes string
 	var pr int
 	var Url bool
 	flag.BoolVar(&Url, "add-url", false, "add GitHub issue URL (omitted by default due to formatting in changelog-build)")
@@ -53,6 +54,7 @@ func main() {
 	flag.StringVar(&description, "description", "", "the changelog entry content")
 	flag.StringVar(&changelogTmpl, "changelog-template", "", "the path of the file holding the template to use for the changelog entries")
 	flag.StringVar(&dir, "dir", "", "the relative path from the current directory of where the changelog entry file should be written")
+	flag.StringVar(&allowedTypes, "allowed-types-file", "", "the relative path from the current directory to a line separated file of allowed types. If not provided, default types are used")
 	flag.Parse()
 
 	if pr == -1 {
@@ -66,10 +68,21 @@ func main() {
 	}
 	fmt.Fprintln(os.Stderr, "Found matching pull request:", url)
 
+	promptTypes := changelog.TypeValues
+	if allowedTypes != "" {
+		file, err := os.ReadFile(allowedTypes)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Failed to read allowed types file: %s\n", err)
+			os.Exit(1)
+		}
+
+		promptTypes = strings.Split(strings.TrimSpace(string(file)), "\n")
+	}
+
 	if changeType == "" {
 		prompt := promptui.Select{
 			Label: "Select a change type",
-			Items: changelog.TypeValues,
+			Items: promptTypes,
 		}
 
 		_, changeType, err = prompt.Run()