use external semver

Makefile

@@ -20,10 +20,15 @@ test: tidy fmt vet
 	go test ./...  -coverprofile=coverage.out
 	go tool cover -func=coverage.out
 
-release:
+release: semver
-	@version=$$(go run version/semver/main.go); \
+	@version=$$(semver); \
 	git tag -s $$version -m"Release $$version"
 	goreleaser --rm-dist
 
 test-release:
 	goreleaser --skip-publish --snapshot --rm-dist
+
+semver:
+ifeq (, $(shell which semver))
+ $(shell go get -u github.com/bakito/semver)
+endif

version/semver/main.go

@@ -1,49 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"fmt"
-	"os"
-	"os/exec"
-	"strings"
-
-	"github.com/coreos/go-semver/semver"
-)
-
-func main() {
-	out, err := exec.Command("git", "branch", "--show-current").Output()
-	if err != nil {
-		panic(err)
-	}
-	branch := strings.TrimSpace(string(out))
-	if branch != "main" {
-		panic(fmt.Errorf(`error: must be in "master" branch, current branch: %q`, branch))
-	}
-
-	out, err = exec.Command("git", "describe").Output()
-	if err != nil {
-		panic(err)
-	}
-
-	version := strings.TrimPrefix(strings.TrimSpace(string(out)), "v")
-	v := semver.New(version)
-	v.BumpPatch()
-	reader := bufio.NewReader(os.Stdin)
-	if _, err = fmt.Fprintf(os.Stderr, "Enter Release Version: [v%v] ", v); err != nil {
-		panic(err)
-	}
-
-	text, err := reader.ReadString('\n')
-	if err != nil {
-		panic(err)
-	}
-	if strings.HasPrefix(text, "v") {
-		text = text[1:]
-		v = semver.New(strings.TrimSpace(text))
-	}
-
-	if _, err = fmt.Fprintf(os.Stderr, "Using Version: v%v\n", v); err != nil {
-		panic(err)
-	}
-	fmt.Printf("v%v", v)
-}