Go言語勉強メモ

$ sudo apt install golang
$ go version
go version go1.21.1 linux/amd64

package main

import "fmt"

func main() {
  fmt.Printf("Hello World!\n")
}

$ go run hello.go
Hello World!

$ go get -u github.com/spf13/cobra@latest
go: go.mod file not found in current directory or any parent directory.
	'go get' is no longer supported outside a module.
	To build and install a command, use 'go install' with a version,
	like 'go install example.com/cmd@latest'
	For more information, see https://golang.org/doc/go-get-install-deprecation
	or run 'go help get' or 'go help install'.

$  go mod init HelloCobra
go: creating new go.mod: module HelloCobra

 $ go get -u github.com/spf13/cobra@latest
go: added github.com/inconshreveable/mousetrap v1.1.0
go: added github.com/spf13/cobra v1.8.0
go: added github.com/spf13/pflag v1.0.5

$ go install github.com/spf13/cobra-cli@latest
# 画面出力は省略
# 雛形作成
$ cobra-ci
コマンド 'cobra-ci' が見つかりません。もしかして:
  command 'cobra-cli' from deb cobra-cli (1.3.0-3build1)
次を試してみてください: sudo apt install <deb name>

$ go env GOPATH
/home/XXX/go
$ ll /home/XXX/go/bin/
合計 43492
drwxrwxr-x 2 XXX XXX     4096  2月 11 11:35 ./
drwxrwxr-x 4 XXX XXX     4096  2月 11 10:44 ../
-rwxrwxr-x 1 XXX XXX  8791501  2月 11 11:08 cobra-cli*
-rwxrwxr-x 1 XXX XXX  5531963  2月 11 11:35 goimports*
-rwxrwxr-x 1 XXX XXX 30199285  2月 11 11:35 gopls*

$ export PATH="~/go/bin:$PATH"
$ source ~/.bashrc 
$ cobra-cli 
Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.

Usage:
  cobra-cli [command]

Available Commands:
  add         Add a command to a Cobra Application
  completion  Generate the autocompletion script for the specified shell
  help        Help about any command
  init        Initialize a Cobra Application

Flags:
  -a, --author string    author name for copyright attribution (default "YOUR NAME")
      --config string    config file (default is $HOME/.cobra.yaml)
  -h, --help             help for cobra-cli
  -l, --license string   name of license for the project
      --viper            use Viper for configuration

Use "cobra-cli [command] --help" for more information about a command.

$ cobra-cli init --license MIT --viper=false

$ go run main.go
A longer description that spans multiple lines and likely contains
examples and usage of using your application. For example:

Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.