Add a --file flag (#9)

Adds a flag allowing the user to specify the Changelog file to read
from.

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [[1.2.0]] - 2020.01.06
+
+### Added
+
+- Add a flag allowing the user to specify the Changelog file to read from.
+
 ## [[1.1.2]] - 2019.12.30
 
 ### Fixed

cmd/root.go

@@ -24,9 +24,11 @@ var rootCmd = &cobra.Command{
 		// Get the flags.
 		extract, err := cmd.Flags().GetBool("extract")
 		utils.Check(err)
+		file, err := cmd.Flags().GetString("file")
+		utils.Check(err)
 
 		// Read the last release information from the Changelog.
-		title, content, err := keeparelease.ReadChangelog("")
+		title, content, err := keeparelease.ReadChangelog(file)
 		utils.Check(err)
 
 		// If extract only, simply display the content of the last release.
@@ -81,6 +83,7 @@ func init() {
 	rootCmd.Flags().BoolP("extract", "x", false, "Only extract the last release information")
 	rootCmd.Flags().StringP("tag", "t", "", "Use a specific tag")
 	rootCmd.Flags().StringArrayP("attach", "a", []string{}, "Specify the assets to include into the release")
+	rootCmd.Flags().StringP("file", "f", "CHANGELOG.md", "Specify a changelog file")
 }
 
 func uploadAssets(gh *github.Client, release *github.Release, assets []string) {

keeparelease/keeparelease.go

@@ -64,9 +64,6 @@ func ParseChangelog(changelog string) (title, content string, err error) {
 // ReadChangelog reads the changelog file.
 // Returns the title of the last release as well as its content.
 func ReadChangelog(file string) (title, content string, err error) {
-	if file == "" {
-		file = "CHANGELOG.md"
-	}
 	dat, err := ioutil.ReadFile(file)
 	if err != nil {
 		return "", "", err