Converting HTML to Compojure DSL

Compojure DSL for creating HTML/XML is great unless you have a lot of HTML code already written. At first my plan was to parse it, write it to a file and manually format it, then I stumbled on this post from compojure mailing list, it is a small utility function written by Robin Brandt. It converts the given HTML file to clojure/compojure DSL.

(ns de.evernet2000.util
  (:use clojure.contrib.str-utils)
  (:use clojure.contrib.duck-streams)
  (:use clojure.contrib.pprint)
  (:use [clojure.xml :only (parse)])
  (:import (java.io File)))

(defn format-attrs
  [m]
  (when m
    (format "%s" m)))

(defn empty-when-null
  [x]
  (if (nil? x)
    ""
    x))

(declare format-full-node)

(defn format-node
  [node]
  (cond
    (string? node) (format "\"%s\"" (.trim node))
    (nil? node) nil
    :else (format-full-node node)))

(defn format-full-node
  [node]
  (format "[%s %s %s]\n"
          (:tag node)
          (empty-when-null (format-attrs (:attrs node)))
          (str-join " " (map format-node (:content node)))))

(defn transform-file
  [filename]
  (print (pprint (read-string (format-node (parse filename))))))

It will complain if you have badly written HTML, in my case it only complained about a bunch of br statements, a simple search and replaced fixed it. If you can't get it to accept your HTML try running it through JTidy, that should fix it.