go工具

以一个简单的例子说明一下go中比较有用的小工具

1. 小工具

1.1 生成一个main.go脚本

jeffreyguan@localhost ~$ cat > main.go
package main
import "fmt"
func main() { fmt.Println("Hello, Jeffrey Guan") }

jeffreyguan@localhost ~$ cat main.go                                                                                                                  130 ↵
package main
import "fmt"
func main() { fmt.Println("Hello, Jeffrey Guan") }

1.2. gofmt main.go

jeffreyguan@localhost ~$ gofmt main.go
package main

import "fmt"

func main() { fmt.Println("Hello, Jeffrey Guan") }

1.3. gofmt -d main.go

jeffreyguan@localhost ~$ gofmt -d main.go
diff -u main.go.orig main.go
--- main.go.orig    2019-08-17 21:42:13.000000000 +0800
+++ main.go 2019-08-17 21:42:13.000000000 +0800
@@ -1,5 +1,5 @@
 package main
-import "fmt"
-func main() { fmt.Println("Hello, Jeffrey Guan") }

+import "fmt"

+func main() { fmt.Println("Hello, Jeffrey Guan") }

1.4. gofmt -w main.go

jeffreyguan@localhost ~$ gofmt -w main.go

jeffreyguan@localhost ~$ cat main.go
package main

import "fmt"

func main() { fmt.Println("Hello, Jeffrey Guan") }

1.5. go build

jeffreyguan@localhost ~$ go build main.go
jeffreyguan@localhost ~$ file main
main: Mach-O 64-bit executable x86_64

按平台生成可执行文件

jeffreyguan@localhost ~$ GOOS=windows go build main.go

jeffreyguan@localhost ~$ file main.exe
main.exe: PE32+ executable (console) x86-64 (stripped to external PDB), for MS Windows

1.6. go get

go get github.com/golang/example/hello

1.7. go list

jeffreyguan@localhost ~/lanjie$ cat main.go
// demo is also demo
package main

import "fmt"

func main() { fmt.Println("Hello, Jeffrey Guan") }
jeffreyguan@localhost ~/lanjie$ go list -f '{{ .Name }}'
main
jeffreyguan@localhost ~/lanjie$ go list -f '{{ .Name }}: {{ .Doc}}'
main: demo is also demo
jeffreyguan@localhost ~/lanjie$ go list -f '{{ .Name }}: {{ .Doc}}'
main: demo is also demo
jeffreyguan@localhost ~/lanjie$ go list -f '{{ .Imports }}'
[fmt]
jeffreyguan@localhost ~/lanjie$ go list -f '{{ join .Imports "\n"}}' fmt
errors
internal/fmtsort
io
math
os
reflect
strconv
sync
unicode/utf8
jeffreyguan@localhost ~/lanjie$ go list -f '{{ .Doc }}' fmt
Package fmt implements formatted I/O with functions analogous to C's printf and scanf.

1.8. do doc

jeffreyguan@localhost ~/lanjie$ go doc fmt
jeffreyguan@localhost ~/lanjie$ go doc fmt Println
func Println(a ...interface{}) (n int, err error)
    Println formats using the default formats for its operands and writes to
    standard output. Spaces are always added between operands and a newline is
    appended. It returns the number of bytes written and any write error
    encountered.

# 在本地启动go doc
jeffreyguan@localhost ~/lanjie$ godoc -http=localhost:6060

1.9 errcheck

1.10 go vet

2. 通过go启动web服务

参考1
参考2