golang实践之find工具

golang写个小工具练练手

https://github.com/beckbikang/go-mfind

a find tool write in golang we can use it find some file

一个简单的文本查找工具

简单的思路：
1 扫描所有的文件
2 多协程判断文件是否符合要求

DONE

1 find filename from a dirpath

TODO

1 just find filename
2 just find dirname
3 find file by size
4 find file by type
5 list more file info

mfinder.go

package finder

import (
    "fmt"
    "io/ioutil"
    "os"
    "runtime"
    "strings"
)

type Mfinder struct {
    DirPath     string   //查找的路径
    FindName    string   //查找的文件名中含有的字段
    MaxFileSize uint64   //文件的最大
    MinFileSize uint64   //文件的最小
    listFiles   []string //文件列表
    HasDir      bool     //是否包含dir
}

//初始化
func NewMfinderSimple(dirpath,filename string) *Mfinder {
    return &Mfinder{DirPath: dirpath,FindName: filename,HasDir: true}
}

//获取列表
func (mf *Mfinder) GetListFiles() []string {
    return mf.listFiles
}

//获取文件列表
func (mf *Mfinder) ListDir(dirPth string) (err error) {
    dirSlice,err := ioutil.ReadDir(dirPth)
    if err != nil {
        return err
    }
    PthSep := string(os.PathSeparator)

    for _,filename := range dirSlice {
        curFile := dirPth + PthSep + filename.Name()
        if filename.IsDir() {
            if mf.HasDir {
                mf.listFiles = append(mf.listFiles,curFile)
            }
            mf.ListDir(curFile)
        } else {
            mf.listFiles = append(mf.listFiles)
        }
    }
    return nil
}

//查找符合要求的文件
func (mf *Mfinder) GetRet(list []string,aChan chan []string) {
    aSlice := make([]string, 100)
    for _,v := range list {
        if mf.checkFindRet(v) {
            aSlice = append(aSlice,v)
        }
    }
    aChan <- aSlice
}

//是否含有子串
func (mf *Mfinder) checkFindRet(path string) bool {
    flag := false
    flag = strings.Contains(path,mf.FindName)

    return flag
}

//获取
func (mf *Mfinder) Run() {
    //利用cpu的多核心
    CPU_NUMS := runtime.NumCPU()
    runtime.GOMAXPROCS(CPU_NUMS)

    //获取文件列表

    mf.ListDir(mf.DirPath)
    listData := mf.GetListFiles()

    //文件查找
    aListLen := len(listData)
    step := (int)(aListLen / CPU_NUMS)

    //分配新的slice
    newSlice := make([][]string,CPU_NUMS)

    //创建携程
    chanArr := make([]chan []string,CPU_NUMS)

    //运行代码
    for i := 0; i < CPU_NUMS; i++ {
        chanArr[i] = make(chan []string)
        newSlice[i] = listData[(i * step):(i*step + step)]
        go mf.GetRet(newSlice[i],chanArr[i])
    }
    //打印找到的文件
    strList := make([]string, 30)
    for _,v := range chanArr {
        values := <-v
        for _,v1 := range values {
            if len(v1) == 0 {
                continue
            }
            fmt.Println(v1)
            strList = append(strList,v1)
        }
    }
}

main.go 文件

package main

import (
    "finder"
    "flag"
    "fmt"
    "log"
    "os"
)

var Usage = func() {
    fmt.Println("USAGE: mfind command [arguments] ...")
    fmt.Println("nThe commands are:ntpatht add file path.ntfilenametthe filename to be matched.")
}

func main() {
    //目录路径
    var dirpath string
    flag.StringVar(&dirpath,"path","","dir path")
    if dirpath == "." {
        newPath,err := os.Getwd()
        dirpath = newPath
        if err != nil {
            log.Fatal("get current dir path faildn")
        }
    }

    //要查找的文件名
    var filename string

    flag.Parse()
    fmt.Println(dirpath,filename)
    if len(dirpath) > 0 && len(filename) > 0 {
        mf := finder.NewMfinderSimple(dirpath,filename)
        mf.Run()
    } else {
        Usage()
    }
}