Adding Pygments helper

helpers/pygments.go

@@ -0,0 +1,45 @@
+// 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())
+		log.Fatal(err)
+	}
+
+	return out.String()
+}