hugo/helpers/pygments.go

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// 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 (
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"bytes"
"fmt"
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"os/exec"
"strings"
jww "github.com/spf13/jwalterweatherman"
"github.com/spf13/viper"
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)
func Highlight(code string, lexer string) string {
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var pygmentsBin = "pygmentize"
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if _, err := exec.LookPath(pygmentsBin); err != nil {
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jww.WARN.Println("Highlighting requires Pygments to be installed and in the path")
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return code
}
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var out bytes.Buffer
var stderr bytes.Buffer
style := viper.GetString("PygmentsStyle")
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noclasses := "true"
if viper.GetBool("PygmentsUseClasses") {
noclasses = "false"
}
cmd := exec.Command(pygmentsBin, "-l"+lexer, "-fhtml", "-O",
fmt.Sprintf("style=%s,noclasses=%s,encoding=utf8", style, noclasses))
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cmd.Stdin = strings.NewReader(code)
cmd.Stdout = &out
cmd.Stderr = &stderr
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if err := cmd.Run(); err != nil {
jww.ERROR.Print(stderr.String())
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return code
}
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return out.String()
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}