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92 lines
2.7 KiB
Clojure
92 lines
2.7 KiB
Clojure
(ns frontend.diff
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(:require [clojure.string :as string]
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["diff" :as jsdiff]
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["diff-match-patch" :as diff-match-patch]
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[goog.object :as gobj]
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[lambdaisland.glogi :as log]
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[cljs-bean.core :as bean]
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[frontend.util :as util]
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[frontend.text :as text]))
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;; TODO: replace with diff-match-patch
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(defn diff
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[s1 s2]
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(-> ((gobj/get jsdiff "diffLines") s1 s2)
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bean/->clj))
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(defonce dmp (diff-match-patch.))
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(defn diffs
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[s1 s2]
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(.diff_main dmp s1 s2 true))
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(defn get-patches
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[s1 s2 diffs]
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(.patch_make dmp s1 s2 diffs))
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(defn apply-patches!
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[text patches]
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(if (seq patches)
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(let [result (.patch_apply dmp patches text)]
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(nth result 0))
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text))
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(def inline-special-chars
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#{\* \_ \/ \` \+ \^ \~ \$})
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(defn- markdown-link?
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[markup current-line pos]
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(and current-line
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(= (util/nth-safe markup pos) "]")
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(= (util/nth-safe markup (inc pos)) "(")
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(string/includes? (subs current-line 0 pos) "[")
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(string/includes? (subs current-line pos) ")")))
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;; (find-position "** hello _w_" "hello w")
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(defn find-position
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[markup text]
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(when (and (string? markup) (string? text))
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(try
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(let [pos (loop [t1 (-> markup string/lower-case seq)
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t2 (-> text string/lower-case seq)
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i1 0
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i2 0]
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(let [[h1 & r1] t1
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[h2 & r2] t2]
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(cond
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(or (empty? t1) (empty? t2))
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i1
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(= h1 h2)
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(recur r1 r2 (inc i1) (inc i2))
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(#{\[ \space \]} h2)
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(recur t1 r2 i1 (inc i2))
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:else
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(recur r1 t2 (inc i1) i2))))
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current-line (text/get-current-line-by-pos markup pos)]
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(cond
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(= (util/nth-safe markup pos)
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(util/nth-safe markup (inc pos))
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"]")
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(+ pos 2)
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(contains? inline-special-chars (util/nth-safe markup pos))
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(let [matched (->> (take-while inline-special-chars (util/safe-subs markup pos))
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(apply str))
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matched? (and current-line (string/includes? current-line (string/reverse matched)))]
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(if matched?
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(+ pos (count matched))
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pos))
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(markdown-link? markup current-line pos)
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(let [idx (string/index-of (subs current-line pos) ")")]
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(+ pos (inc idx)))
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:else
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pos))
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(catch js/Error e
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(log/error :diff/find-position {:error e})
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(count markup)))))
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