Add: CmdHelper

Author: Openset

helper/README.md

@@ -1,3 +1,5 @@
+<!--This file generated by command(leetcode helper); DO NOT EDIT.-->
+
 # Helper
 
 ```text
@@ -7,8 +9,11 @@ Usage:
 	leetcode <command> [arguments]
 The commands are:
 	readme      	build README.md file
+	helper      	build helper file
+	question    	build problem description file
 	test        	run go test
 	update      	update self
+	description 	build all problems description file
 	version     	print leetcode version
 	help        	show command usage
 

internal/base/base.go

@@ -2,7 +2,9 @@ package base
 
 import (
 	"fmt"
+	"io/ioutil"
 	"os"
+	"path"
 	"strings"
 )
 
@@ -51,6 +53,21 @@ func Usage() {
 	Exit()
 }
 
+func FilePutContents(filename string, data []byte) {
+	filename = getFilePath(filename)
+	err := ioutil.WriteFile(filename, data, 0644)
+	CheckErr(err)
+}
+
+func getFilePath(filename string) string {
+	if dir := path.Dir(filename); dir != "" {
+		if err := os.MkdirAll(dir, 0755); err != nil {
+			CheckErr(err)
+		}
+	}
+	return filename
+}
+
 func CheckErr(err error) {
 	if err != nil {
 		panic(err)

internal/helper/helper.go

@@ -0,0 +1,30 @@
+package helper
+
+import (
+	"bytes"
+	"os/exec"
+
+	"github.com/openset/leetcode/internal/base"
+)
+
+var CmdHelper = &base.Command{
+	Run:       runHelper,
+	UsageLine: "helper",
+	Short:     "build helper file",
+	Long:      "build helper README.md file.",
+}
+
+func runHelper(cmd *base.Command, args []string) {
+	if len(args) != 0 {
+		cmd.Usage()
+	}
+	var bf bytes.Buffer
+	bf.WriteString("<!--This file generated by command(leetcode helper); DO NOT EDIT.-->\n\n")
+	bf.WriteString("# Helper\n\n")
+	bf.WriteString("```text\n")
+	out, err := exec.Command(base.CmdName).Output()
+	base.CheckErr(err)
+	bf.Write(out)
+	bf.WriteString("```\n")
+	base.FilePutContents("helper/README.md", bf.Bytes())
+}

main.go

@@ -8,6 +8,7 @@ import (
 	"github.com/openset/leetcode/internal/base"
 	"github.com/openset/leetcode/internal/description"
 	"github.com/openset/leetcode/internal/help"
+	"github.com/openset/leetcode/internal/helper"
 	"github.com/openset/leetcode/internal/question"
 	"github.com/openset/leetcode/internal/readme"
 	"github.com/openset/leetcode/internal/test"
@@ -19,9 +20,10 @@ func init() {
 	base.Commands = []*base.Command{
 		readme.CmdReadme,
 		question.CmdQuestion,
+		description.CmdDescription,
 		test.CmdTest,
 		update.CmdUpdate,
-		description.CmdDescription,
+		helper.CmdHelper,
 		version.CmdVersion,
 		help.CmdHelp,
 	}