com

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 Go to latest Published: Mar 21, 2019 License: Apache-2.0 Imports: 26 Imported by: 0

README

Common Functions

Build Status Go Walker

This is an open source project for commonly used functions for the Go programming language.

This package need >= go 1.2

Code Convention: based on Go Code Convention.

Contribute

Your contribute is welcome, but you have to check following steps after you added some functions and commit them:

  1. Make sure you wrote user-friendly comments for all functions .
  2. Make sure you wrote test cases with any possible condition for all functions in file *_test.go.
  3. Make sure you wrote benchmarks for all functions in file *_test.go.
  4. Make sure you wrote useful examples for all functions in file example_test.go.
  5. Make sure you ran go test and got PASS .

Documentation

Overview

Package com is an open source project for commonly used functions for the Go programming language.

Index

Examples

Constants

View Source 
const (
	Gray = uint8(iota + 90)
	Red
	Green
	Yellow
	Blue
	Magenta
	//NRed      = uint8(31) // Normal
	EndColor = "\033[0m"
)

Color number constants.

View Source 
const (
	Byte  = 1
	KByte = Byte * 1024
	MByte = KByte * 1024
	GByte = MByte * 1024
	TByte = GByte * 1024
	PByte = TByte * 1024
	EByte = PByte * 1024
)

Storage unit constants.

Variables

View Source 
var UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1541.0 Safari/537.36"

Functions

func AESGCMDecrypt 

func AESGCMDecrypt(key, ciphertext []byte) ([]byte, error)

AESGCMDecrypt decrypts ciphertext with the given key using AES in GCM mode.

func AESGCMEncrypt 

func AESGCMEncrypt(key, plaintext []byte) ([]byte, error)

AESGCMEncrypt encrypts plaintext with the given key using AES in GCM mode.

func AppendStr 

func AppendStr(strs []string, str string) []string

AppendStr appends string to slice with no duplicates.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	s := []string{"a"}
	s = com.AppendStr(s, "a")
	s = com.AppendStr(s, "b")
	fmt.Println(s)
}

Output:

[a b]

func Base64Decode 

func Base64Decode(str string) (string, error)

base64 decode

func Base64Encode 

func Base64Encode(str string) string

base64 encode

func ColorLog 

func ColorLog(format string, a ...interface{})

ColorLog prints colored log to stdout. See color rules in function 'ColorLogS'.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	com.ColorLog(fmt.Sprintf(
		"[WARN] This is a tesing log that should be colored, path( %s ),"+
			" highlight # %s #, error [ %s ].",
		"path to somewhere", "highlighted content", "tesing error"))
}

Output:

func ColorLogS 

func ColorLogS(format string, a ...interface{}) string

ColorLogS colors log and return colored content. Log format: <level> <content [highlight][path]> [ error ]. Level: TRAC -> blue; ERRO -> red; WARN -> Magenta; SUCC -> green; others -> default. Content: default; path: yellow; error -> red. Level has to be surrounded by "[" and "]". Highlights have to be surrounded by "# " and " #"(space), "#" will be deleted. Paths have to be surrounded by "( " and " )"(space). Errors have to be surrounded by "[ " and " ]"(space). Note: it hasn't support windows yet, contribute is welcome.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	coloredLog := com.ColorLogS(fmt.Sprintf(
		"[WARN] This is a tesing log that should be colored, path( %s ),"+
			" highlight # %s #, error [ %s ].",
		"path to somewhere", "highlighted content", "tesing error"))
	fmt.Println(coloredLog)
}

Output:

func CompareSliceStr 

func CompareSliceStr(s1, s2 []string) bool

CompareSliceStr compares two 'string' type slices. It returns true if elements and order are both the same.

func CompareSliceStrU 

func CompareSliceStrU(s1, s2 []string) bool

CompareSliceStrU compares two 'string' type slices. It returns true if elements are the same, and ignores the order.

func Copy 

func Copy(src, dest string) error

Copy copies file from source to target path.

func CopyDir 

func CopyDir(srcPath, destPath string, filters ...func(filePath string) bool) error

CopyDir copy files recursively from source to target directory.

The filter accepts a function that process the path info. and should return true for need to filter.

It returns error when error occurs in underlying functions.

func Date 

func Date(ti int64, format string) string

Format unix time int64 to string

func DateParse 

func DateParse(dateString, format string) (time.Time, error)

Parse Date use PHP time format.

func DateS 

func DateS(ts string, format string) string

Format unix time string to string

func DateT 

func DateT(t time.Time, format string) string

Format time.Time struct to string MM - month - 01 M - month - 1, single bit DD - day - 02 D - day 2 YYYY - year - 2006 YY - year - 06 HH - 24 hours - 03 H - 24 hours - 3 hh - 12 hours - 03 h - 12 hours - 3 mm - minute - 04 m - minute - 4 ss - second - 05 s - second = 5

func ExecCmd 

func ExecCmd(cmdName string, args ...string) (string, string, error)

ExecCmd executes system command and return stdout, stderr in string type, along with possible error.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	stdout, stderr, err := com.ExecCmd("go", "help", "get")
	fmt.Println(stdout, stderr, err)
}

Output:

func ExecCmdBytes 

func ExecCmdBytes(cmdName string, args ...string) ([]byte, []byte, error)

ExecCmdBytes executes system command and return stdout, stderr in bytes type, along with possible error.

func ExecCmdDir 

func ExecCmdDir(dir, cmdName string, args ...string) (string, string, error)

ExecCmdDir executes system command in given directory and return stdout, stderr in string type, along with possible error.

func ExecCmdDirBytes 

func ExecCmdDirBytes(dir, cmdName string, args ...string) ([]byte, []byte, error)

ExecCmdDirBytes executes system command in given directory and return stdout, stderr in bytes type, along with possible error.

func Expand 

func Expand(template string, match map[string]string, subs ...string) string

Expand replaces {k} in template with match[k] or subs[atoi(k)] if k is not in match.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	match := map[string]string{
		"domain":    "gowalker.org",
		"subdomain": "github.com",
	}
	s := "http://{domain}/{subdomain}/{0}/{1}"
	fmt.Println(com.Expand(s, match, "Unknwon", "gowalker"))
}

Output:

http://gowalker.org/github.com/Unknwon/gowalker

func FetchFiles 

func FetchFiles(client *http.Client, files []RawFile, header http.Header) error

FetchFiles fetches files specified by the rawURL field in parallel.

Example 
package main

import (
	"fmt"
	"net/http"

	"github.com/Unknwon/com"
)

type rawFile struct {
	name   string
	rawURL string
	data   []byte
}

func (rf *rawFile) Name() string {
	return rf.name
}

func (rf *rawFile) RawUrl() string {
	return rf.rawURL
}

func (rf *rawFile) Data() []byte {
	return rf.data
}

func (rf *rawFile) SetData(p []byte) {
	rf.data = p
}

func main() {
	// Code that should be outside of your function body.
	// type rawFile struct {
	// name   string
	// 	rawURL string
	// 	data   []byte
	// }

	// func (rf *rawFile) Name() string {
	// 	return rf.name
	// }

	// func (rf *rawFile) RawUrl() string {
	// 	return rf.rawURL
	// }

	// func (rf *rawFile) Data() []byte {
	// 	return rf.data
	// }

	// func (rf *rawFile) SetData(p []byte) {
	// 	rf.data = p
	// }

	files := []com.RawFile{
		&rawFile{rawURL: "http://example.com"},
		&rawFile{rawURL: "http://example.com/foo"},
	}
	err := com.FetchFiles(&http.Client{}, files, nil)
	fmt.Println(err, len(files[0].Data()), len(files[1].Data()))
}

Output:

func FetchFilesCurl 

func FetchFilesCurl(files []RawFile, curlOptions ...string) error

FetchFilesCurl uses command `curl` to fetch files specified by the rawURL field in parallel.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

type rawFile struct {
	name   string
	rawURL string
	data   []byte
}

func (rf *rawFile) Name() string {
	return rf.name
}

func (rf *rawFile) RawUrl() string {
	return rf.rawURL
}

func (rf *rawFile) Data() []byte {
	return rf.data
}

func (rf *rawFile) SetData(p []byte) {
	rf.data = p
}

func main() {
	// Code that should be outside of your function body.
	// type rawFile struct {
	// name   string
	// 	rawURL string
	// 	data   []byte
	// }

	// func (rf *rawFile) Name() string {
	// 	return rf.name
	// }

	// func (rf *rawFile) RawUrl() string {
	// 	return rf.rawURL
	// }

	// func (rf *rawFile) Data() []byte {
	// 	return rf.data
	// }

	// func (rf *rawFile) SetData(p []byte) {
	// 	rf.data = p
	// }

	files := []com.RawFile{
		&rawFile{rawURL: "http://example.com"},
		&rawFile{rawURL: "http://example.com/foo"},
	}
	err := com.FetchFilesCurl(files)
	fmt.Println(err, len(files[0].Data()), len(files[1].Data()))
}

Output:

func FileMTime 

func FileMTime(file string) (int64, error)

FileMTime returns file modified time and possible error.

func FileSize 

func FileSize(file string) (int64, error)

FileSize returns file size in bytes and possible error.

func GetAllSubDirs 

func GetAllSubDirs(rootPath string) ([]string, error)

GetAllSubDirs returns all subdirectories of given root path. Slice does not include given path itself.

func GetFileListBySuffix 

func GetFileListBySuffix(dirPath, suffix string) ([]string, error)

GetFileListBySuffix returns an ordered list of file paths. It recognize if given path is a file, and don't do recursive find.

func GetGOPATHs 

func GetGOPATHs() []string

GetGOPATHs returns all paths in GOPATH variable.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	gps := com.GetGOPATHs()
	fmt.Println(gps)
}

Output:

func GetSrcPath 

func GetSrcPath(importPath string) (appPath string, err error)

GetSrcPath returns app. source code path. It only works when you have src. folder in GOPATH, it returns error not able to locate source folder path.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	srcPath, err := com.GetSrcPath("github.com/Unknwon/com")
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println(srcPath)
}

Output:

func HexStr2int 

func HexStr2int(hexStr string) (int, error)

HexStr2int converts hex format string to decimal number.

func HomeDir 

func HomeDir() (home string, err error)

HomeDir returns path of '~'(in Linux) on Windows, it returns error when the variable does not exist.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	hd, err := com.HomeDir()
	fmt.Println(hd, err)
}

Output:

func Html2JS 

func Html2JS(data []byte) []byte

Html2JS converts []byte type of HTML content into JS format.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	htm := "<div id=\"button\" class=\"btn\">Click me</div>\n\r"
	js := string(com.Html2JS([]byte(htm)))
	fmt.Println(js)
}

Output:

<div id=\"button\" class=\"btn\">Click me</div>\n

func HtmlDecode 

func HtmlDecode(str string) string

HtmlDecode decodes string to html chars

func HtmlEncode 

func HtmlEncode(str string) string

encode html chars to string

func HttpCall 

func HttpCall(client *http.Client, method, url string, header http.Header, body io.Reader) (io.ReadCloser, error)

HttpCall makes HTTP method call.

func HttpGet 

func HttpGet(client *http.Client, url string, header http.Header) (io.ReadCloser, error)

HttpGet gets the specified resource. ErrNotFound is returned if the server responds with status 404.

Example 
package main

import (
	"io/ioutil"
	"net/http"

	"github.com/Unknwon/com"
)

func main() ([]byte, error) {
	rc, err := com.HttpGet(&http.Client{}, "http://gowalker.org", nil)
	if err != nil {
		return nil, err
	}
	p, err := ioutil.ReadAll(rc)
	rc.Close()
	return p, err
}

Output:

func HttpGetBytes 

func HttpGetBytes(client *http.Client, url string, header http.Header) ([]byte, error)

HttpGetBytes gets the specified resource. ErrNotFound is returned if the server responds with status 404.

Example 
package main

import (
	"net/http"

	"github.com/Unknwon/com"
)

func main() ([]byte, error) {
	p, err := com.HttpGetBytes(&http.Client{}, "http://gowalker.org", nil)
	return p, err
}

Output:

func HttpGetJSON 

func HttpGetJSON(client *http.Client, url string, v interface{}) error

HttpGetJSON gets the specified resource and mapping to struct. ErrNotFound is returned if the server responds with status 404.

Example 
package main

import (
	"net/http"

	"github.com/Unknwon/com"
)

func main() interface{} {
	j := com.HttpGetJSON(&http.Client{}, "http://gowalker.org", nil)
	return j
}

Output:

func HttpGetToFile 

func HttpGetToFile(client *http.Client, url string, header http.Header, fileName string) error

HttpGetToFile gets the specified resource and writes to file. ErrNotFound is returned if the server responds with status 404.

func HttpPost 

func HttpPost(client *http.Client, url string, header http.Header, body []byte) (io.ReadCloser, error)

HttpPost posts the specified resource. ErrNotFound is returned if the server responds with status 404.

func HttpPostJSON 

func HttpPostJSON(client *http.Client, url string, body, v interface{}) error

HttpPostJSON posts the specified resource with struct values, and maps results to struct. ErrNotFound is returned if the server responds with status 404.

func HumaneFileSize 

func HumaneFileSize(s uint64) string

HumaneFileSize calculates the file size and generate user-friendly string.

func Int2HexStr 

func Int2HexStr(num int) (hex string)

Int2HexStr converts decimal number to hex format string.

func IsDir 

func IsDir(dir string) bool

IsDir returns true if given path is a directory, or returns false when it's a file or does not exist.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	if com.IsDir("files") {
		fmt.Println("directory 'files' exists")
		return
	}
	fmt.Println("'files' is not a directory or does not exist")
}

Output:

func IsEmail 

func IsEmail(email string) bool

IsEmail validates string is an email address, if not return false basically validation can match 99% cases

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	fmt.Println(com.IsEmail("test@example.com"))
	fmt.Println(com.IsEmail("@example.com"))
}

Output:

true
false

func IsEmailRFC 

func IsEmailRFC(email string) bool

IsEmailRFC validates string is an email address, if not return false this validation omits RFC 2822

func IsExist 

func IsExist(path string) bool

IsExist checks whether a file or directory exists. It returns false when the file or directory does not exist.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	if com.IsExist("file.go") {
		fmt.Println("file.go exists")
		return
	}
	fmt.Println("file.go does not exist")
}

Output:

func IsFile 

func IsFile(filePath string) bool

IsFile returns true if given path is a file, or returns false when it's a directory or does not exist.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	if com.IsFile("file.go") {
		fmt.Println("file.go exists")
		return
	}
	fmt.Println("file.go is not a file or does not exist")
}

Output:

func IsLetter 

func IsLetter(l uint8) bool

IsLetter returns true if the 'l' is an English letter.

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	fmt.Println(com.IsLetter('1'))
	fmt.Println(com.IsLetter('['))
	fmt.Println(com.IsLetter('a'))
	fmt.Println(com.IsLetter('Z'))
}

Output:

false
false
true
true

func IsSliceContainsInt64 

func IsSliceContainsInt64(sl []int64, i int64) bool

IsSliceContainsInt64 returns true if the int64 exists in given slice.

func IsSliceContainsStr 

func IsSliceContainsStr(sl []string, str string) bool

IsSliceContainsStr returns true if the string exists in given slice, ignore case.

func IsUrl 

func IsUrl(url string) bool

IsUrl validates string is a url link, if not return false simple validation can match 99% cases

Example 
package main

import (
	"fmt"

	"github.com/Unknwon/com"
)

func main() {
	fmt.Println(com.IsUrl("http://example.com"))
	fmt.Println(com.IsUrl("http//example.com"))
}

Output:

true
false

func LgetAllSubDirs 

func LgetAllSubDirs(rootPath string) ([]string, error)

LgetAllSubDirs returns all subdirectories of given root path, including following symbolic links, if any. Slice does not include given path itself.

func LstatDir 

func LstatDir(rootPath string, includeDir ...bool) ([]string, error)

LstatDir gathers information of given directory by depth-first. It returns slice of file list, follows symbolic links and includes subdirectories if enabled; it returns error and nil slice when error occurs in underlying functions, or given path is not a directory or does not exist.

Slice does not include given path itself. If subdirectories is enabled, they will have suffix '/'.

func Nl2br 

func Nl2br(str string) string

change \n to <br/>

func PowInt 

func PowInt(x int, y int) int

PowInt is int type of math.Pow function.

func RandomCreateBytes 

func RandomCreateBytes(n int, alphabets ...byte) []byte

RandomCreateBytes generate random []byte by specify chars.

func Reverse 

func Reverse(s string) string

Reverse s string, support unicode

func StatDir 

func StatDir(rootPath string, includeDir ...bool) ([]string, error)

StatDir gathers information of given directory by depth-first. It returns slice of file list and includes subdirectories if enabled; it returns error and nil slice when error occurs in underlying functions, or given path is not a directory or does not exist.

Slice does not include given path itself. If subdirectories is enabled, they will have suffix '/'.

func StripTags 

func StripTags(src string) string

strip tags in html string

func ToSnakeCase 

func ToSnakeCase(str string) string

ToSnakeCase can convert all upper case characters in a string to underscore format.

Some samples. 

"FirstName"  => "first_name"
"HTTPServer" => "http_server"
"NoHTTPS"    => "no_https"
"GO_PATH"    => "go_path"
"GO PATH"    => "go_path"      // space is converted to underscore.
"GO-PATH"    => "go_path"      // hyphen is converted to underscore.

From https://github.com/huandu/xstrings

func ToStr 

func ToStr(value interface{}, args ...int) (s string)

Convert any type to string.

func UrlDecode 

func UrlDecode(str string) (string, error)

url decode string

func UrlEncode 

func UrlEncode(str string) string

url encode string, is + not %20

func WriteFile 

func WriteFile(filename string, data []byte) error

WriteFile writes data to a file named by filename. If the file does not exist, WriteFile creates it and its upper level paths.

Types

type NotFoundError 

type NotFoundError struct {
	Message string
}

func (NotFoundError) Error 

func (e NotFoundError) Error() string

type RawFile 

type RawFile interface {
	Name() string
	RawUrl() string
	Data() []byte
	SetData([]byte)
}

A RawFile describes a file that can be downloaded.

type RemoteError 

type RemoteError struct {
	Host string
	Err  error
}

func (*RemoteError) Error 

func (e *RemoteError) Error() string

type StrTo 

type StrTo string

Convert string to specify type.

func (StrTo) Exist 

func (f StrTo) Exist() bool

func (StrTo) Float64 

func (f StrTo) Float64() (float64, error)

func (StrTo) Int 

func (f StrTo) Int() (int, error)

func (StrTo) Int64 

func (f StrTo) Int64() (int64, error)

func (StrTo) MustFloat64 

func (f StrTo) MustFloat64() float64

func (StrTo) MustInt 

func (f StrTo) MustInt() int

func (StrTo) MustInt64 

func (f StrTo) MustInt64() int64

func (StrTo) MustUint8 

func (f StrTo) MustUint8() uint8

func (StrTo) String 

func (f StrTo) String() string

func (StrTo) Uint8 

func (f StrTo) Uint8() (uint8, error)

Source Files

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