simple regex-based recursive filename search

search.go

package main

import (
    "io/ioutil"
    "os"
    "path"
    "regexp"
)

func handle(err error) {
    if err != nil {
        panic(err)
    }
}

func fileList(dirname string) []string {
    contents, err := ioutil.ReadDir(dirname)
    handle(err)
    names := make([]string, len(contents))
    for _, file := range contents {
        if file.IsDir() {
            names = append(names, fileList(path.Join(dirname, file.Name()))...)
        } else {
            names = append(names, path.Join(dirname, file.Name()))
        }
    }
    return names
}

func main() {
    dirname, err := os.Getwd()
    handle(err)
    filePaths := fileList(dirname)
    for _, arg := range os.Args[1:] {
        re, err := regexp.Compile(arg)
        handle(err)
        for _, filePath := range filePaths {
            if re.MatchString(filePath) {
                println(path.Clean(filePath))
            }
        }
    }
}