gobox中的常用工具包gomisc

有一些常用的工具函数，我们把它们放到gomisc这个包中。

工具介绍

Slice中的值Unique

func IntSliceUnique(s []int) []int
func StringSliceUnique(s []string) []string

示例：

package main

import (
    "github.com/goinbox/gomisc"

    "fmt"
)

func main() {
    TestIntSliceUnique()
    TestStringSliceUnique()
}

func TestIntSliceUnique() {
    s := []int{1, 2, 2, 3, 3, 3, 4, 4, 4, 4}

    fmt.Println("origin slice is: ", s)

    s = gomisc.IntSliceUnique(s)

    fmt.Println("after call slice is: ", s)
}

func TestStringSliceUnique() {
    s := []string{"a", "ab", "ab", "abc", "abc", "abc", "abcd", "abcd", "abcd", "abcd", "abcd"}

    fmt.Println("origin slice is: ", s)

    s = gomisc.StringSliceUnique(s)

    fmt.Println("after call slice is: ", s)
}

输出：

origin slice is:  [1 2 2 3 3 3 4 4 4 4]
after call slice is:  [1 2 3 4]
origin slice is:  [a ab ab abc abc abc abcd abcd abcd abcd abcd]
after call slice is:  [a ab abc abcd]

文件、目录是否存在

func FileExist(path string) bool
func DirExist(path string) bool

示例：

package main

import (
    "github.com/goinbox/gomisc"

    "fmt"
)

func main() {
    TestFileExist()
    TestDirExist()
}

func TestFileExist() {
    f := "/etc/passwd"

    r := gomisc.FileExist(f)
    if r {
        fmt.Println(f, "is exist")
    } else {
        fmt.Println(f, "is not exist")
    }
}

func TestDirExist() {
    d := "/home/ligang/devspace"

    r := gomisc.DirExist(d)
    if r {
        fmt.Println(d, "is exist")
    } else {
        fmt.Println(d, "is not exist")
    }
}

输出：

/etc/passwd is exist
/home/ligang/devspace is exist

多个[]byte拼接

func AppendBytes(b []byte, elems ...[]byte) []byte

示例：

package main

import (
    "github.com/goinbox/gomisc"

    "fmt"
)

func main() {
    b := []byte("abc")
    b = gomisc.AppendBytes(b, []byte("def"), []byte("ghi"))

    fmt.Println(string(b))
}

输出：

abcdefghi

列出目录中的所有文件（包括子目录）

func ListFilesInDir(rootDir string) ([]string, error)

示例：

package main

import (
    "github.com/goinbox/gomisc"

    "fmt"
)

func main() {
    fileList, err := gomisc.ListFilesInDir("/home/ligang/tmp")
    if err != nil {
        fmt.Println(err)
        return
    }

    for _, path := range fileList {
        fmt.Println(path)
    }
}

输出：

/home/ligang/tmp/misc/accounts.json
/home/ligang/tmp/go/main.go
/home/ligang/tmp/go/.idea/modules.xml
/home/ligang/tmp/go/.idea/workspace.xml
/home/ligang/tmp/go/.idea/go.iml

保存/解析json文件

func SaveJsonFile(filePath string, v interface{}) error
func ParseJsonFile(filePath string, v interface{}) error

示例：

package main

import (
    "github.com/goinbox/gomisc"

    "fmt"
)

func main() {
    filePath := "/tmp/test_save_parse_json_file.json"

    v1 := make(map[string]string)
    v1["k1"] = "a"
    v1["k2"] = "b"
    v1["k3"] = "c"

    err := gomisc.SaveJsonFile(filePath, v1)
    if err != nil {
        fmt.Println("save json file failed: " + err.Error())
    }

    v2 := make(map[string]string)
    err = gomisc.ParseJsonFile(filePath, &v2)
    if err != nil {
        fmt.Println("parse json file failed: " + err.Error())
    }

    ok := true
    for k, v := range v2 {
        if v != v1[k] {
            ok = false
            fmt.Println("save parse json file error, k: " + k + " not equal")
        }
    }
    if ok {
        fmt.Println("save parse json file ok")
    }
}

输出：

save parse json file ok

字符串截取

func SubString(str string, start, cnt int) (string, error)

示例：

package main

import (
    "github.com/goinbox/gomisc"

    "fmt"
)

func main() {
    s := "abcdefg"

    _, err := gomisc.SubString(s, 3, 20)
    fmt.Println(err)

    _, err = gomisc.SubString(s, 10, 3)
    fmt.Println(err)

    ss, _ := gomisc.SubString(s, 3, 4)
    fmt.Println(ss)
}

输出：

end too long
end too long
defg

时间格式化定义

const (
    TIME_FMT_STR_YEAR   = "2006"
    TIME_FMT_STR_MONTH  = "01"
    TIME_FMT_STR_DAY    = "02"
    TIME_FMT_STR_HOUR   = "15"
    TIME_FMT_STR_MINUTE = "04"
    TIME_FMT_STR_SECOND = "05"
)

// 时间格式：yy-mm-dd H:i:s
func TimeGeneralLayout() string {
    layout := TIME_FMT_STR_YEAR + "-" + TIME_FMT_STR_MONTH + "-" + TIME_FMT_STR_DAY + " "
    layout += TIME_FMT_STR_HOUR + ":" + TIME_FMT_STR_MINUTE + ":" + TIME_FMT_STR_SECOND

    return layout
}

生成随机数

func RandByTime(t *time.Time) int64

示例：

package main

import (
    "github.com/goinbox/gomisc"

    "fmt"
    "time"
)

func main() {
    tm := time.Now()
    fmt.Println(gomisc.RandByTime(&tm), gomisc.RandByTime(&tm), gomisc.RandByTime(nil))
}

输出：

6537266505970973466 6537266505970973466 5616191991172093652

欢迎大家使用，使用中有遇到问题随时反馈，我们会尽快响应，谢谢！