[golang]寫了一個可以用 go 來寫腳本的工具：gosl

• 2019 年 10 月 11 日
• 筆記

轉自：https://golangtc.com/t/53cca103320b52060a000030

寫了一個可以用 go 來寫腳本的工具：gosl

代碼和使用說明可以看這裡： http://github.com/daviddengcn/gosl

Go Search 已經完全用 gosl 來啟動了。

相比 bash/Python 寫腳本的好處：

1. 純 Go 語言，沒有新的學習成本
2. 引入預先導入的 package 和預定義的內置函數，方便腳本書寫
3. 可以無縫的和 Go 項目銜接，例如可以直接讀取數據和配置。
4. 和 Go 有相同的執行效率，大大快過 Python

這裡貼一個簡單的例子：

#!/bin/gosl    APPS := []string {    "tocrawl", "crawler", "mergedocs", "indexer",  }    for {    for _, app := range APPS {      Printf("Running %s...n", app)      Bash(app)    }  }

gosl 

This is an application that can make you write script with the Go language.

It is NOT an interpreter but the pure Go. The preprocessor tranforms the script into a Go program, instantly compiles and runs. So it is almost same as the standard Go with the same efficiency.

Benefit

1. Pure Go language. No need to learn a new script language.
2. Pre-imported packages and pre-defined functions make it easy to code.
3. Seamless integration with the Go project. E.g. can easily load configuration or data file from the Go project.
4. Running efficiency same as Go, much faster than Python.

Example

• Simple

#!/bin/gosl    import "encoding/json"    toJson := func(lines []string) string {    res, _ := json.Marshal(struct {      Lines []string `json:"lines"`    }{      Lines: lines,    })    return string(res)  }    files := BashEval("ls -l %s", "/tmp/")    Println(toJson(Split(files, "n")))      

• Go Search is now operating with gosl. So you can find some good examples at: https://github.com/daviddengcn/gcse/tree/master/scripts
• go-diff also provides scripts in gosl: https://github.com/daviddengcn/go-diff/tree/master/scripts

Installation and Usage

Download and install the package

go get github.com/daviddengcn/gosl go install github.com/daviddengcn/gosl

(Optional) Link to /bin

sudo ln -s $GOPATH/bin/gosl /bin/gosl

If you don't want to do this, the interpreter line can be like this, assuming $GOPATH/bin is in your $PATH:

#!/usr/bin/env gosl

Run a script

If a script starts with the bash interpreter line: #!/bin/gosl. You can run it like this

chmod a+x example.gs ./example.gs [params…]

Or you can explictly call gosl to run it:

gosl example.gs [params…]

Pre-imported Packages

The following packages are pre-imported with ., i.e. you can directly use the methods exported by them. No complain of the compiler if you don't use them.

fmt, os, strings, strconv, math, time, and github.com/daviddengcn/gosl/builtin

Frequently Used builtin Functions

More functions are defined in package daviddengcn/gosl/builtin/ (godoc)