Add version flag

The main.version variable can be overridden at build time:

go build -ldflags="-X 'main.version=v0.0.1'"

This is done by default by goreleaser (see
https://goreleaser.com/customization/build/)

cmd/root.go

@@ -16,9 +16,6 @@
 package cmd
 
 import (
-	"fmt"
-	"os"
-
 	"github.com/sboehler/knut/cmd/balance"
 	"github.com/sboehler/knut/cmd/benchmark"
 	"github.com/sboehler/knut/cmd/completion"
@@ -33,11 +30,12 @@ import (
 )
 
 // CreateCmd creates the command.
-func CreateCmd() *cobra.Command {
+func CreateCmd(version string) *cobra.Command {
 	var c = &cobra.Command{
-		Use:   "knut",
-		Short: "knut is a plain text accounting tool",
-		Long:  `knut is a plain text accounting tool for tracking personal finances and investments.`,
+		Use:     "knut",
+		Short:   "knut is a plain text accounting tool",
+		Long:    `knut is a plain text accounting tool for tracking personal finances and investments.`,
+		Version: version,
 	}
 	c.AddCommand(balance.CreateCmd())
 	c.AddCommand(importer.CreateCmd())
@@ -48,15 +46,6 @@ func CreateCmd() *cobra.Command {
 	c.AddCommand(benchmark.CreateCmd())
 	c.AddCommand(web.CreateCmd())
 	c.AddCommand(completion.CreateCmd(c))
-	return c
-}
 
-// Execute adds all child commands to the root command and sets flags appropriately.
-// This is called by main.main(). It only needs to happen once to the RootCmd.
-func Execute() {
-	c := CreateCmd()
-	if err := c.Execute(); err != nil {
-		fmt.Fprintln(c.ErrOrStderr(), err)
-		os.Exit(1)
-	}
+	return c
 }

main.go

@@ -15,6 +15,9 @@
 package main
 
 import (
+	"fmt"
+	"os"
+
 	"github.com/sboehler/knut/cmd"
 
 	// enable importers here
@@ -27,6 +30,12 @@ import (
 	_ "github.com/sboehler/knut/cmd/importer/viac"
 )
 
+var version = "development"
+
 func main() {
-	cmd.Execute()
+	var c = cmd.CreateCmd(version)
+	if err := c.Execute(); err != nil {
+		fmt.Fprintln(c.ErrOrStderr(), err)
+		os.Exit(1)
+	}
 }

scripts/builddoc.go

@@ -113,7 +113,7 @@ func generate(c *config) error {
 }
 
 func run(args []string) string {
-	var c = cmd.CreateCmd()
+	var c = cmd.CreateCmd("development")
 	c.SetArgs(args)
 	var b strings.Builder
 	b.WriteString("$ knut")