mirror of
https://github.com/gohugoio/hugo.git
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112 lines
2.6 KiB
Go
112 lines
2.6 KiB
Go
// Copyright © 2014 Steve Francia <spf@spf13.com>.
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//
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// Licensed under the Simple Public License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://opensource.org/licenses/Simple-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package helpers
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import (
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"bytes"
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"crypto/md5"
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"encoding/hex"
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"fmt"
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"io"
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"net"
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"path/filepath"
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"strings"
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)
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// Filepath separator defined by os.Separator.
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const FilePathSeparator = string(filepath.Separator)
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func FindAvailablePort() (*net.TCPAddr, error) {
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l, err := net.Listen("tcp", ":0")
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if err == nil {
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defer l.Close()
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addr := l.Addr()
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if a, ok := addr.(*net.TCPAddr); ok {
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return a, nil
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}
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return nil, fmt.Errorf("Unable to obtain a valid tcp port. %v", addr)
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}
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return nil, err
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}
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// InStringArray checks if a string is an element of a slice of strings
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// and returns a boolean value.
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func InStringArray(arr []string, el string) bool {
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for _, v := range arr {
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if v == el {
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return true
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}
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}
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return false
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}
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// GuessType attempts to guess the type of file from a given string.
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func GuessType(in string) string {
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switch strings.ToLower(in) {
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case "md", "markdown", "mdown":
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return "markdown"
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case "rst":
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return "rst"
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case "html", "htm":
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return "html"
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}
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return "unknown"
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}
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// ReaderToBytes takes an io.Reader argument, reads from it
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// and returns bytes.
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func ReaderToBytes(lines io.Reader) []byte {
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b := new(bytes.Buffer)
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b.ReadFrom(lines)
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return b.Bytes()
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}
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// ReaderToString is the same as ReaderToBytes, but returns a string.
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func ReaderToString(lines io.Reader) string {
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b := new(bytes.Buffer)
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b.ReadFrom(lines)
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return b.String()
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}
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// StringToReader does the opposite of ReaderToString.
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func StringToReader(in string) io.Reader {
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return strings.NewReader(in)
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}
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// BytesToReader does the opposite of ReaderToBytes.
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func BytesToReader(in []byte) io.Reader {
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return bytes.NewReader(in)
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}
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// SliceToLower goes through the source slice and lowers all values.
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func SliceToLower(s []string) []string {
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if s == nil {
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return nil
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}
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l := make([]string, len(s))
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for i, v := range s {
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l[i] = strings.ToLower(v)
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}
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return l
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}
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// Md5String takes a string and returns its MD5 hash.
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func Md5String(f string) string {
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h := md5.New()
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h.Write([]byte(f))
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return hex.EncodeToString(h.Sum([]byte{}))
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}
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