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Allow using $source$ inside Markdown files #219

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Allow using $source$ inside Markdown files #219

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15 changes: 12 additions & 3 deletions support/shake/app/Shake/Markdown.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -72,17 +72,26 @@ buildMarkdown refs modname input output = do
| length modname > 24 = '…':reverse (take 24 (reverse modname))
| otherwise = modname

variables =
[ ("title", title)
, ("source", permalink)
]

addVars :: (Text -> String -> b -> b) -> b -> b
addVars f a = foldl' (\a (k, v) -> f k v a) a variables

mStr = MetaString . Text.pack
patchMeta
= Meta
. Map.insert "title" (mStr title)
. Map.insert "source" (mStr permalink)
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. addVars (\k v -> Map.insert k (mStr v))
. Map.insert "bibliography" (mStr bibliographyName)
. Map.insert "link-citations" (MetaBool True)
. unMeta

(markdown, references) <- liftIO do
contents <- Text.readFile input
-- Perform a basic variable substitution on the file. We don't really want to use
-- Pandoc's full templating system, as the $xyz$ variable syntax conflicts with LaTeX.
contents <- addVars (\k v -> Text.replace ("$" <> k <> "$") (Text.pack v)) <$> Text.readFile input
either (fail . show) pure =<< runIO do
Pandoc meta markdown <- readMarkdown def { readerExtensions = getDefaultExtensions "markdown" } [(input, contents)]
let pandoc = Pandoc (patchMeta meta) markdown
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