hugo/helpers/pygments.go

// Copyright © 2013 Steve Francia <spf@spf13.com>.
//
// Licensed under the Simple Public License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://opensource.org/licenses/Simple-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package helpers

import (
    "bytes"
    "log"
    "os/exec"
    "strings"
)

func Highlight(code string, lexer string) string {
    var pygmentsBin = "pygmentize"

    if _, err := exec.LookPath(pygmentsBin); err != nil {
        log.Print("Highlighting requries Pygments to be installed and in the path")
        return code
    }

    var out bytes.Buffer
    var stderr bytes.Buffer

    cmd := exec.Command(pygmentsBin, "-l"+lexer, "-fhtml", "-O style=monokai,noclasses=true,encoding=utf-8")
    cmd.Stdin = strings.NewReader(code)
    cmd.Stdout = &out
    cmd.Stderr = &stderr

    if err := cmd.Run(); err != nil {
        log.Print(stderr.String())
        return code
    }

    return out.String()
}