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38 lines
912 B
Nix
38 lines
912 B
Nix
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# Quick-and-dirty re-implementation of org-babel-tangle in Nix.
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{ languages
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, processLines
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}:
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string:
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with builtins;
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let
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lines = filter isString (split "\n" string);
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dropUntil = import ./dropUntil.nix;
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blockStartRegexp =
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"[[:space:]]*\#\\+[Bb][Ee][Gg][Ii][Nn]_[Ss][Rr][Cc][[:space:]]+"
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+ "(" + (concatStringsSep "|" languages) + ")"
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+ "([[:space:]].*)?";
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isBlockStart = line: match blockStartRegexp line != null;
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splitListWith = import ./splitWith.nix;
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blockEndRegexp = "[[:space:]]*\#\\+[Ee][Nn][Dd]_[Ss][Rr][Cc].*";
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isBlockEnd = line: match blockEndRegexp line != null;
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go = acc: xs:
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let
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st1 = dropUntil isBlockStart xs;
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st2 = splitListWith isBlockEnd st1;
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in
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if length xs == 0
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then acc
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else if length st1 == 0
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then acc
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else (go (acc ++ [ st2.before ]) st2.after);
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in
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concatStringsSep "\n" (concatLists (go [ ] (processLines lines)))
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