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(ns clarktown.correctors.indented-code-block
(:require
[clojure.string :as string]
[clarktown.matchers.list-block :as list-block-matcher]))
(defn- in-code-block?
"Determines whether the current `line` is within a code block."
[lines index]
(->> (take index lines)
(filter #(string/starts-with? (string/trim %) "```"))
count
odd?))
(defn newline-above?
"Determines whether there's a need for an empty new line
above the `line` at the current `index`. In the case of a
code block, which starts with three backticks (```), if there's
no empty newline above, we need to create one, and so this
function must then return `true`."
[lines line index]
(let [space-count (count (take-while #{\space} line))
not-first? (> index 0)
prev-line (when not-first?
(nth lines (- index 1)))
space-count-prev-line (count (take-while #{\space} prev-line))]
(and (>= space-count 4)
not-first?
(not (in-code-block? lines index))
(not (list-block-matcher/match? line))
(not (list-block-matcher/match? prev-line))
(not (>= space-count-prev-line 4))
(not (= (-> prev-line
string/trim)
"")))))
(defn newline-below?
"Determines whether there's a need for an empty new line
below the `line` at the current `index`. In the case of a
code block, which ends with three backticks (```), if there's
no empty newline above, we need to create one, and so this
function must then return `true`."
[lines line index]
(let [space-count (count (take-while #{\space} line))
not-last? (< index (- (count lines) 1))
next-line (when not-last?
(nth lines (+ index 1)))
space-count-next-line (count (take-while #{\space} next-line))]
(and (>= space-count 4)
not-last?
(not (in-code-block? lines index))
(not (list-block-matcher/match? line))
(not (list-block-matcher/match? next-line))
(not (>= space-count-next-line 4))
(not (= (-> next-line
string/trim) "")))))
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