refactor: rewrite gendocs to generate en/zh docs for one time

scripts/gen-docs/main.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/cobra/doc"
+
+	"kusionstack.io/kusion/pkg/kusionctl/cmd"
+	"kusionstack.io/kusion/pkg/log"
+	uio "kusionstack.io/kusion/pkg/util/io"
+)
+
+var docsMatrix = map[string]string{
+	"en": "en_US.UTF-8",
+	"zh": "zh_CN.UTF-8",
+}
+
+func main() {
+	// use os.Args instead of "flags" because "flags" will mess up the man pages!
+	path := "docs/cmd/"
+	if len(os.Args) == 2 {
+		path = os.Args[1]
+	} else if len(os.Args) > 2 {
+		log.Fatal("usage: %s [output directory]\n", os.Args[0])
+	}
+
+	outDir, err := uio.OutDir(path)
+	if err != nil {
+		log.Fatal(os.Stderr, "failed to get output directory: %v\n", err)
+	}
+
+	genDocs(outDir)
+}
+
+func genDocs(rootDir string) {
+	for langDir, lang := range docsMatrix {
+		targetDir := filepath.Join(rootDir, langDir)
+		if err := os.MkdirAll(targetDir, os.ModePerm); err != nil {
+			log.Fatal("make target dir '%s' failed: %v", targetDir, err)
+		}
+		if err := os.Setenv("LANG", lang); err != nil {
+			log.Fatal("set env 'LANG' to '%s' failed: %v", lang, err)
+		}
+		command := cmd.NewKusionctlCmd(bytes.NewReader(nil), io.Discard, io.Discard)
+		if err := doc.GenMarkdownTree(command, targetDir); err != nil {
+			log.Fatal("generate markdown tree failed: %v", err)
+		}
+	}
+}