sever-parse: add thing

semver-parse/main.go

···
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/Masterminds/semver/v3"
+)
+
+func main() {
+	if err := realMain(
+		os.Args,
+		os.Stdin,
+		os.Stdout,
+		os.Stderr,
+	); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+	}
+}
+
+func realMain(
+	_ []string,
+	stdin io.Reader,
+	stdout io.Writer,
+	stderr io.Writer,
+) error {
+	scanner := bufio.NewScanner(stdin)
+	for scanner.Scan() {
+		line := scanner.Text()
+		version, err := semver.NewVersion(line)
+		if err != nil {
+			fmt.Fprintf(stderr, "%v: %v\n", err, line)
+			continue
+		}
+
+		dump(stdout, version)
+	}
+
+	return scanner.Err()
+}
+
+func dump(w io.Writer, v *semver.Version) {
+	fmt.Fprintf(w, "Version: %s\n", v)
+	fmt.Fprintf(w, "Major: %d\n", v.Major())
+	fmt.Fprintf(w, "Minor: %d\n", v.Minor())
+	fmt.Fprintf(w, "Patch: %d\n", v.Patch())
+	fmt.Fprintf(w, "Prerelease: %s\n", v.Prerelease())
+	fmt.Fprintf(w, "Meta: %s\n", v.Metadata())
+}