simple CLI

cmd/main.go

@@ -0,0 +1,7 @@
+package main
+
+import "github.com/noirbizarre/gonja/cmd/sub"
+
+func main() {
+	sub.Execute()
+}

cmd/sub/root.go

@@ -0,0 +1,76 @@
+/*
+Copyright © 2022 Christian Kniep <[email protected]>
+*/
+package sub
+
+import (
+	"os"
+	"strings"
+
+	"github.com/noirbizarre/gonja"
+	"github.com/spf13/cobra"
+)
+
+// rootCmd represents the base command when called without any subcommands
+var (
+	rootCmd = &cobra.Command{
+		Use:   "gonja-cli <template> <dst>",
+		Short: "Command-line tool to render gonja templates",
+		Long:  `Command-line tool to render gonja templates`,
+		Run:   rCmd,
+	}
+)
+
+// 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() {
+	err := rootCmd.Execute()
+	if err != nil {
+		os.Exit(1)
+	}
+}
+
+func init() {
+	cobra.OnInitialize(initConfig)
+	// Here you will define your flags and configuration settings.
+	// Cobra supports persistent flags, which, if defined here,
+	// will be global for your application.
+}
+
+// initConfig reads in config file and ENV variables if set.
+func initConfig() {
+
+}
+
+func rCmd(cmd *cobra.Command, args []string) {
+	if len(args) < 2 {
+		cmd.Help()
+		os.Exit(1)
+	}
+	tpl, err := gonja.FromFile(args[0])
+	if err != nil {
+		panic(err)
+	}
+	// Now you can render the template with the given
+	// gonja.Context how often you want to.
+	ctx := gonja.Context{}
+	for _, element := range os.Environ() {
+		variable := strings.Split(element, "=")
+		ctx[variable[0]] = variable[1]
+	}
+	out, err := tpl.Execute(ctx)
+	if err != nil {
+		panic(err)
+	}
+	dst := args[1]
+	if dst == "-" {
+		os.Stdout.WriteString(out)
+	} else {
+		f, err := os.Create(dst)
+		if err != nil {
+			panic(err)
+		}
+		defer f.Close()
+		f.WriteString(out + "\n")
+	}
+}

cmd/sub/root_test.go

@@ -0,0 +1,27 @@
+package sub
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_Render(t *testing.T) {
+	fIn, err := os.CreateTemp("", "goja-cli-test")
+	assert.NoError(t, err)
+	defer os.Remove(fIn.Name())
+	fIn.WriteString("{{ FOO }}")
+	fIn.Sync()
+	os.Setenv("FOO", "bar")
+	fOut, err := os.CreateTemp("", "goja-cli-out")
+	assert.NoError(t, err)
+	defer os.Remove(fOut.Name())
+	rCmd(nil, []string{fIn.Name(), fOut.Name()})
+	assert.NoError(t, err)
+	assert.FileExists(t, fOut.Name())
+	file, err := ioutil.ReadFile(fOut.Name())
+	assert.NoError(t, err)
+	assert.Equal(t, "bar\n", string(file))
+}

go.mod

@@ -11,6 +11,8 @@ require (
 	github.com/pkg/errors v0.8.1
 	github.com/pmezard/go-difflib v1.0.0
 	github.com/sirupsen/logrus v1.3.0
+	github.com/spf13/cobra v1.6.1
 	github.com/stretchr/testify v1.2.2
 	github.com/x-cray/logrus-prefixed-formatter v0.5.2
+	golang.org/x/sys v0.2.0 // indirect
 )

go.sum

@@ -6,18 +6,25 @@ github.com/bmuller/arrow v0.0.0-20180318014521-b14bfde8dff2/go.mod h1:+voQMVaya0
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+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
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+github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
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+github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
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@@ -31,32 +38,49 @@ github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hd
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