Adding Pygments helper

diff --git a/helpers/pygments.go b/helpers/pygments.go
new file mode 100644 (file)
index 0000000..6b912fc
--- /dev/null
+++ b/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()
+}