generating "," instead of keeping it in repository

,

@@ -1,14 +0,0 @@
-#!/bin/sh
-
-script_path=$(realpath $0)
-script_dir=$(dirname $script_path)
-
-cd $script_dir
-
-output=/tmp/commandgo
-
-# 为什么不直接使用 go run . 呢
-# 因为 go run 编译时会往 PATH 里注入 Go 的 bin 目录，这个修改过后的 PATH 会传递给子进程
-# 于是程序运行起来时获取的 PATH 环境变量和外界不一致，因此不用 go run . 编译运行
-go build -o $output . && $output $@
-

.gitignore

@@ -1 +1,2 @@
+,
 *~

main.go

@@ -1,10 +1,29 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"os"
 )
 
+var commaSh = `#!/bin/sh
+
+script_path=$(realpath $0)
+script_dir=$(dirname $script_path)
+
+cd $script_dir
+
+output=/tmp/commandgo
+
+# why not just using "go run ." ?
+# Because "go run ." will inject GOBIN into PATH while compiling,
+# and modifed PATH will pass into actual program.
+# So the program doesn't have the same PATH as outside.
+# It's not a acceptable behavior.
+
+go build -o $output . && $output $@
+`
+
 func commandsUsage() string {
 	return fmt.Sprintf(
 		`commands:
@@ -13,6 +32,18 @@ func commandsUsage() string {
 }
 
 func main() {
+	pwd, err := os.Getwd()
+	if err != nil {
+		panic(fmt.Errorf("detect current directory failed! %w", err))
+	}
+	target := pwd + string(os.PathSeparator) + ","
+	_, err = os.Stat(target)
+	if errors.Is(err, os.ErrNotExist) {
+		err := os.WriteFile(target, []byte(commaSh), 0755)
+		if err != nil {
+			panic(fmt.Errorf("write sh failed: %w", err))
+		}
+	}
 	if len(os.Args) >= 2 {
 		switch os.Args[1] {
 		case "path":

readme.md

@@ -2,5 +2,21 @@
 
 Personal tools set written in Golang.
 
-To use it just clone and add the directory to *PATH*.
-Then type "," command, all commands will appear.
+## How to run
+
+0. Clone this repository to somewhere
+0. Add the root directory to *PATH*
+0. change directory to the root directory
+0. Run `go run .` to generate "," command
+0. Run "," command to see all commands
+
+"," command can auto rebuild if you change the code in this repository.
+Actually it always builds each time you type it! Because `go build` is
+very fast and it has cache, it's not a problem in terms of speed.
+
+## Q&A
+
+Q: Why generating "," shell script instead of putting it in repository?
+
+A: I like the repository keeps 100% Go source code. I tried writting ","
+shell script as a Go source code with shebang, but it didn't work.