Golang语言开发（四）

go get github.com/samber/lo@v1

import (
    "github.com/samber/lo"
    lop "github.com/samber/lo/parallel"
)

$ go get github.com/duke-git/lancet/v2

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    s := "hello"
    rs := strutil.ReverseStr(s)
    fmt.Println(rs) //olleh
}

go install github.com/x-motemen/gore/cmd/gore@latest

gore

go get -u /github.com/antonmedv/expr

package main

import (
	"fmt"
	"github.com/antonmedv/expr"
)

func main() {
	env := map[string]interface{}{
		"foo": 1,
		"bar": 2,
	}

	out, err := expr.Eval("foo + bar", env)

	if err != nil {
		panic(err)
	}
	fmt.Print(out)
}

go get github.com/melbahja/goph

package main

import (
	"log"
	"fmt"
	"github.com/melbahja/goph"
)

func main() {

	// Start new ssh connection with private key.
	auth, err := goph.Key("/home/mohamed/.ssh/id_rsa", "")
	if err != nil {
		log.Fatal(err)
	}

	client, err := goph.New("root", "192.1.1.3", auth)
	if err != nil {
		log.Fatal(err)
	}

	// Defer closing the network connection.
	defer client.Close()

	// Execute your command.
	out, err := client.Run("ls /tmp/")

	if err != nil {
		log.Fatal(err)
	}

	// Get your output as []byte.
	fmt.Println(string(out))
}

// with private key
auth, err := goph.Key("/home/mohamed/.ssh/id_rsa", "you_passphrase_here")
if err != nil {
	// handle error
}

client, err := goph.New("root", "192.1.1.3", auth)

// Clones the given repository in memory, creating the remote, the local
// branches and fetching the objects, exactly as:
Info("git clone https://github.com/go-git/go-billy")

r, err := git.Clone(memory.NewStorage(), nil, &git.CloneOptions{
    URL: "https://github.com/go-git/go-billy",
})

CheckIfError(err)

// Gets the HEAD history from HEAD, just like this command:
Info("git log")

// ... retrieves the branch pointed by HEAD
ref, err := r.Head()
CheckIfError(err)


// ... retrieves the commit history
cIter, err := r.Log(&git.LogOptions{From: ref.Hash()})
CheckIfError(err)

// ... just iterates over the commits, printing it
err = cIter.ForEach(func(c *object.Commit) error {
	fmt.Println(c)
	return nil
})
CheckIfError(err)

package main

import "github.com/melbahja/got"

func main() {

	g := got.New()

	err := g.Download("http://localhost/file.ext", "/path/to/save")

	if err != nil {
		// ..
	}
}

package main

import (
    "fmt"

    "github.com/shirou/gopsutil/v3/mem"
    // "github.com/shirou/gopsutil/mem"  // to use v2
)

func main() {
    v, _ := mem.VirtualMemory()

    // almost every return value is a struct
    fmt.Printf("Total: %v, Free:%v, UsedPercent:%f%%\n", v.Total, v.Free, v.UsedPercent)

    // convert to JSON. String() is also implemented
    fmt.Println(v)
}

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/urfave/cli/v2"
)

func main() {
    app := &cli.App{
        Name:  "greet",
        Usage: "fight the loneliness!",
        Action: func(*cli.Context) error {
            fmt.Println("Hello friend!")
            return nil
        },
    }

    if err := app.Run(os.Args); err != nil {
        log.Fatal(err)
    }
}

go get github.com/d5/tengo/v2

package main

import (
	"context"
	"fmt"

	"github.com/d5/tengo/v2"
)

func main() {
	// create a new Script instance
	script := tengo.NewScript([]byte(
`each := func(seq, fn) {
    for x in seq { fn(x) }
}

sum := 0
mul := 1
each([a, b, c, d], func(x) {
    sum += x
    mul *= x
})`))

	// set values
	_ = script.Add("a", 1)
	_ = script.Add("b", 9)
	_ = script.Add("c", 8)
	_ = script.Add("d", 4)

	// run the script
	compiled, err := script.RunContext(context.Background())
	if err != nil {
		panic(err)
	}

	// retrieve values
	sum := compiled.Get("sum")
	mul := compiled.Get("mul")
	fmt.Println(sum, mul) // "22 288"
}