sarulabs/statix

package helpers

import (
    "bytes"
    "crypto/md5"
    "encoding/hex"
    "os"
    "path/filepath"
)

// RewritePath rewrites `currentPath`.
// If `currentPath` is absolute, it does nothing but clean it.
// But if `currentPath` is relative, it is prefixed by `basePath`.
func RewritePath(basePath, currentPath string) string {
    if basePath == "" || filepath.IsAbs(currentPath) {
        return filepath.Clean(currentPath)
    }

    b := bytes.NewBufferString(basePath)
    b.WriteByte(os.PathSeparator)
    b.WriteString(currentPath)

    return filepath.Clean(b.String())
}

// AddFileSuffix adds a suffix in a filename.
// If the filename has an extension, the suffix is added just before.
// The returned path is cleaned.
func AddFileSuffix(filename, suffix string) string {
    dir := filepath.Dir(filename)
    ext := filepath.Ext(filename)
    base := filepath.Base(filename)
    name := base[:len(base)-len(ext)]

    b := bytes.NewBuffer(nil)
    b.WriteString(dir)
    b.WriteByte(os.PathSeparator)
    b.WriteString(name)
    b.WriteString(suffix)
    b.WriteString(ext)

    return filepath.Clean(b.String())
}

// MD5 returns the md5 hash of an array of byte.
func MD5(content []byte) string {
    h := md5.New()
    h.Write(content)
    return hex.EncodeToString(h.Sum(nil))
}