Version flag implementation

main.go

@@ -16,11 +16,24 @@ import (
 
 	"github.com/arduino/arduino-language-server/ls"
 	"github.com/arduino/arduino-language-server/streams"
+	"github.com/arduino/arduino-language-server/version"
 	"github.com/arduino/go-paths-helper"
 	"github.com/mattn/go-isatty"
 )
 
 func main() {
+	showVersion := flag.Bool("version", false, "Show version information")
+	flag.BoolVar(showVersion, "v", false, "Show version information")
+
+	// Parse flags early to handle version flag
+	flag.Parse()
+
+	if *showVersion {
+		info := version.NewInfo("arduino-language-server")
+		fmt.Println(info.ShortString())
+		os.Exit(0)
+	}
+
 	if len(os.Args) > 1 && os.Args[1] == "remove-temp-files" {
 		for _, tmpFile := range os.Args[2:] {
 			// SAFETY CHECK

version/version.go

@@ -15,7 +15,10 @@
 
 package version
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
 var (
 	defaultVersionString = "0.0.0-git"
@@ -46,6 +49,24 @@ func (i *Info) String() string {
 	return fmt.Sprintf("%[1]s Version: %[2]s Commit: %[3]s Date: %[4]s", i.Application, i.VersionString, i.Commit, i.Date)
 }
 
+func (i *Info) ShortString() string {
+	base := fmt.Sprintf("%s %s", i.Application, i.VersionString)
+	if i.Commit == "" && i.Date == "" {
+		return base
+	}
+
+	details := []string{}
+	if i.Commit != "" {
+		details = append(details, i.Commit)
+	}
+	if i.Date != "" {
+		shortDate := strings.Split(i.Date, "T")[0]
+		details = append(details, shortDate)
+	}
+
+	return fmt.Sprintf("%s (%s)", base, strings.Join(details, " "))
+}
+
 //nolint:gochecknoinits
 func init() {
 	if versionString == "" {

version/version_test.go

@@ -0,0 +1,78 @@
+package version
+
+import (
+	"testing"
+)
+
+func TestNewInfo(t *testing.T) {
+	info := NewInfo("TestApp")
+	if info.Application != "TestApp" {
+		t.Errorf("Expected application name 'TestApp', got '%s'", info.Application)
+	}
+}
+
+func TestInfoString(t *testing.T) {
+	info := &Info{
+		Application:   "TestApp",
+		VersionString: "1.0.0",
+		Commit:        "abc123",
+		Date:          "2023-01-01",
+	}
+	expected := "TestApp Version: 1.0.0 Commit: abc123 Date: 2023-01-01"
+	if got := info.String(); got != expected {
+		t.Errorf("Expected '%s', got '%s'", expected, got)
+	}
+}
+
+func TestInfoShortString(t *testing.T) {
+	tests := []struct {
+		name     string
+		info     Info
+		expected string
+	}{
+		{
+			name: "full info",
+			info: Info{
+				Application:   "TestApp",
+				VersionString: "1.0.0",
+				Commit:        "abc123",
+				Date:          "2023-01-01T12:00:00Z",
+			},
+			expected: "TestApp 1.0.0 (abc123 2023-01-01)",
+		},
+		{
+			name: "no commit",
+			info: Info{
+				Application:   "TestApp",
+				VersionString: "1.0.0",
+				Date:          "2023-01-01T12:00:00Z",
+			},
+			expected: "TestApp 1.0.0 (2023-01-01)",
+		},
+		{
+			name: "no date",
+			info: Info{
+				Application:   "TestApp",
+				VersionString: "1.0.0",
+				Commit:        "abc123",
+			},
+			expected: "TestApp 1.0.0 (abc123)",
+		},
+		{
+			name: "version only",
+			info: Info{
+				Application:   "TestApp",
+				VersionString: "1.0.0",
+			},
+			expected: "TestApp 1.0.0",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.info.ShortString(); got != tt.expected {
+				t.Errorf("Expected '%s', got '%s'", tt.expected, got)
+			}
+		})
+	}
+}