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