feat: Add version print

pkg/version/verflag/verflag.go

@@ -0,0 +1,48 @@
+// MIT License
+//
+// Copyright (c) 2024 vinchent <vinchent@vinchent.xyz>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package verflag
+
+import (
+	"fmt"
+	"os"
+
+	"git.vinchent.xyz/vinchent/howmuch/pkg/version"
+	"github.com/spf13/pflag"
+)
+
+const versionFlagName = "version"
+
+var doPrint *bool
+
+func AddFlags(fs *pflag.FlagSet) {
+	doPrint = fs.BoolP("version", "v", true, "Print version and exit")
+	// By default, set to false
+	*doPrint = false
+}
+
+func PrintVersion() {
+	fmt.Printf("%s\n", version.Get().String())
+	if *doPrint {
+		os.Exit(0)
+	}
+}