cryogen-core/src/cryogen_core/toc.clj

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(ns cryogen-core.toc
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(:require [crouton.html :as html]
[hiccup.core :as hiccup]))
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(def _h [:h1 :h2 :h3 :h4 :h5 :h6])
(defn- compare_index [i1 i2] (- (.indexOf _h i2) (.indexOf _h i1)))
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(defn get-headings [content]
(reduce
(fn [headings {:keys [tag attrs content] :as elm}]
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(if (some #{tag} _h)
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(conj headings elm)
(if-let [more-headings (get-headings content)]
(into headings more-headings)
headings)))
[] content))
(defn make-links [headings]
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(loop [items headings acc nil _last nil]
(if-let [{tag :tag [{{name :name} :attrs} title] :content} (first items)]
(if (nil? name) (recur (rest items) acc nil)
(let [entry [:li [:a {:href (str "#" name)} title]]
jump (compare_index _last tag)]
(cond (> jump 0) (recur (rest items) (str acc "<ol>" (hiccup/html entry)) tag)
(= jump 0) (recur (rest items) (str acc (hiccup/html entry)) tag)
(< jump 0) (recur (rest items) (str acc (apply str (repeat (* -1 jump) "</ol>"))
(hiccup/html entry)) tag))))
(str acc "</ol>"))))
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(defn generate-toc [html]
(-> html
(.getBytes)
(java.io.ByteArrayInputStream.)
(html/parse)
:content
(get-headings)
(make-links)
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(clojure.string/replace-first #"ol" "ol class=\"contents\"")))