read version from build info if version was not injected at build time (go install)

inject version from tag at build time for local builds

Taskfile.yaml

@@ -7,6 +7,8 @@ vars:
   PROGRAM: gobs-cli
   SHELL: '{{if eq .OS "Windows_NT"}}powershell{{end}}'
   BIN_DIR: bin
+  VERSION:
+    sh: 'git describe --tags $(git rev-list --tags --max-count=1)'
 
 tasks:
   default:
@@ -35,13 +37,13 @@ tasks:
   build-windows:
     desc: Build the gobs-cli project for Windows
     cmds:
-      - GOOS=windows GOARCH=amd64 go build -ldflags "-X 'main.version=debug'" -o {{.BIN_DIR}}/{{.PROGRAM}}_windows_amd64.exe
+      - GOOS=windows GOARCH=amd64 go build -ldflags "-X 'main.version={{.VERSION}}'" -o {{.BIN_DIR}}/{{.PROGRAM}}_windows_amd64.exe
     internal: true
 
   build-linux:
     desc: Build the gobs-cli project for Linux
     cmds:
-      - GOOS=linux GOARCH=amd64 go build -ldflags "-X 'main.version=debug'" -o {{.BIN_DIR}}/{{.PROGRAM}}_linux_amd64
+      - GOOS=linux GOARCH=amd64 go build -ldflags "-X 'main.version={{.VERSION}}'" -o {{.BIN_DIR}}/{{.PROGRAM}}_linux_amd64
     internal: true
 
   test:

version.go

@@ -2,11 +2,13 @@ package main
 
 import (
 	"fmt"
+	"runtime/debug"
+	"strings"
 
 	"github.com/alecthomas/kong"
 )
 
-var version = "unknown"
+var version string
 
 // VersionFlag is a custom flag type for displaying version information.
 type VersionFlag string
@@ -19,6 +21,14 @@ func (v VersionFlag) IsBool() bool { return true }
 
 // BeforeApply implements the kong.Flag interface for VersionFlag.
 func (v VersionFlag) BeforeApply(app *kong.Kong, _ kong.Vars) error { // nolint: unparam
+	if version == "" {
+		info, ok := debug.ReadBuildInfo()
+		if !ok {
+			return fmt.Errorf("failed to read build info")
+		}
+		version = strings.Split(info.Main.Version, "-")[0]
+	}
+
 	fmt.Printf("gobs-cli version: %s\n", version)
 	app.Exit(0) // Exit the application after printing the version
 	return nil