add ldflags for branch to gothub update

cmd/gothub/update.go

@@ -3,6 +3,7 @@ package gothub
 import (
 	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/spf13/cobra"
 
@@ -30,6 +31,9 @@ func update() {
 		os.Exit(1)
 	}
 	gitPull := exec.Command("git", "pull")
+	curBranch := exec.Command("git", "rev-parse", "--abbrev-ref", "HEAD")
+	curBranchOut, _ := curBranch.CombinedOutput()
+	ldFlags := "-X codeberg.org/gothub/gothub/utils.Branch=" + strings.Replace(string(curBranchOut), "\n", "", -1)
 	var out bytes.Buffer
 	gitPull.Stdout = &out
 	err := gitPull.Run()
@@ -42,7 +46,7 @@ func update() {
 		os.Exit(1)
 	}
 	if runtime.GOOS == "windows" {
-		err := exec.Command("go", "build", "-o", "gothub.exe").Run()
+		err := exec.Command("go", "build", "-o", "gothub.exe", ldFlags).Run()
 		if err != nil {
 			fmt.Println("Couldn't build GotHub.", err)
 			os.Exit(1)
@@ -51,7 +55,7 @@ func update() {
 			os.Exit(0)
 		}
 	} else {
-		err := exec.Command("go", "build").Run()
+		err := exec.Command("go", "build", "-ldflags", ldFlags).Run()
 		if err != nil {
 			fmt.Println("Couldn't build GotHub.", err)
 			os.Exit(1)