feat: add a new --suffix flag

Signed-off-by: Carlos A Becker <caarlos0@gmail.com>

README.md

@@ -100,6 +100,10 @@ For example, `v1.2.3` would be output as `1.2.3`.
 The default prefix is `v`, however a custom prefix can be supplied using `--prefix`.
 So for `--prefix=foo/v --strip-prefix` and tag `foo/v1.2.3`, the output would be `1.2.3`.
 
+## adding a suffix
+
+`--suffix` can be used to set a custom suffix for the tag, e.g. build metadata or prelease.
+
 ## force patch version increment
 
 Setting the `--force-patch-increment` flag forces a patch version increment regardless of the commit message content.

main.go

@@ -24,6 +24,7 @@ var (
 	preRelease          = app.Flag("pre-release", "discards pre-release metadata if set to false").Default("true").Bool()
 	build               = app.Flag("build", "discards build metadata if set to false").Default("true").Bool()
 	prefix              = app.Flag("prefix", "set a custom prefix").Default("v").String()
+	suffix              = app.Flag("suffix", "set a custom a custom suffix (metadata and/or prerelease)").String()
 	stripPrefix         = app.Flag("strip-prefix", "strips the prefix from the tag").Default("false").Bool()
 	tagMode             = app.Flag("tag-mode", "determines if latest tag of the current or all branches will be used").Default("current-branch").Enum("current-branch", "all-branches")
 	forcePatchIncrement = nextCmd.Flag("force-patch-increment", "forces a patch version increment regardless of the commit message content").Default("false").Bool()
@@ -67,13 +68,20 @@ func main() {
 	case currentCmd.FullCommand():
 		result = *current
 	}
-	fmt.Println(getVersion(tag, *prefix, result.String(), *stripPrefix))
+
+	result.SetMetadata(current.Metadata())
+	fmt.Println(getVersion(tag, *prefix, result.String(), *suffix, *stripPrefix))
 }
 
-func getVersion(tag, prefix, result string, stripPrefix bool) string {
+func getVersion(tag, prefix, result, suffix string, stripPrefix bool) string {
 	if stripPrefix {
 		prefix = ""
 	}
+
+	if suffix != "" {
+		result = result + "-" + suffix
+	}
+
 	return prefix + result
 }