feat: add version info

Signed-off-by: Abirdcfly <fp544037857@gmail.com>

cmd/dupword/main.go

@@ -23,11 +23,26 @@
 package main
 
 import (
+	"fmt"
+	"runtime/debug"
+
 	"github.com/Abirdcfly/dupword"
 
 	"golang.org/x/tools/go/analysis/singlechecker"
 )
 
 func main() {
+	dupword.Version = buildVersion()
 	singlechecker.Main(dupword.NewAnalyzer())
 }
+
+var (
+	version = "dev"
+	commit  = "none"
+	date    = "now"
+)
+
+func buildVersion() string {
+	info, _ := debug.ReadBuildInfo()
+	return fmt.Sprintf("version\t%s\ncommit\t%s\ndate\t%s\n%s", version, commit, date, info.String())
+}

dupword.go

@@ -78,6 +78,7 @@ func NewAnalyzer() *analysis.Analyzer {
 	}
 	a.Flags.Init(Name, flag.ExitOnError)
 	a.Flags.Var(analyzer, "keyword", "key words for detecting duplicate words")
+	a.Flags.Var(version{}, "V", "print version and exit")
 	return a
 }
 

version.go

@@ -0,0 +1,41 @@
+// MIT License
+//
+// # Copyright (c) 2022 Abirdcfly
+//
+// 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 dupword
+
+import (
+	"fmt"
+	"os"
+)
+
+var Version = "dev"
+
+type version struct{}
+
+func (version) IsBoolFlag() bool { return true }
+func (version) Get() interface{} { return nil }
+func (version) String() string   { return "" }
+func (version) Set(_ string) error {
+	fmt.Println(Version)
+	os.Exit(0)
+	return nil
+}