63 lines
1.7 KiB
Nix
63 lines
1.7 KiB
Nix
# Basic git INI-like file format parser
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#
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# Probably not feature complete anytime soon...
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#
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# Notable omissions:
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# - multiline values (if supported??)
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# - proper subsections
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# - includes
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# - conditional includes
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# - keys with embedded whitespace
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#
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# Low hanging fruit:
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# - group by section if you need to query the file often
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#
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# Unknowns:
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# - whitespace before section header?
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# - what if no section is specified before first item?
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#
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{ lib ? import <nixpkgs/lib>, ... }:
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let
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inherit (lib.strings) splitString hasPrefix removePrefix removeSuffix replaceStrings;
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inherit (lib.lists) foldl' head tail;
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parseIniText = text:
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let
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rawLines = splitString "\n" text;
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folded = foldl' step zero rawLines;
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zero = { section = "";
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items = [];
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};
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step = r@{ section, items }: line:
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if hasPrefix "[" line
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then r // {
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section = removePrefix "[" (removeSuffix "]" line);
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}
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else if builtins.match ".*=.*" line != null then
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let
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s = splitString "=" line;
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s0 = head s;
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key = replaceStrings [" " "\t"] ["" ""] s0;
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v = removePrefix "${s0}=" line;
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value = lstrip v;
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in
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r // {
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items = items ++ [{ inherit section key value; }];
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}
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else
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r
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;
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in
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folded.items
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;
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lstrip = s: if hasPrefix " " s then lstrip (removePrefix " " s)
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else if hasPrefix "\t" s then lstrip (removePrefix "\t" s)
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else s;
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parseIniFile = p:
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builtins.addErrorContext ("while parsing INI file " + toString p) (
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parseIniText (builtins.readFile p)
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)
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;
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in {
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inherit parseIniText parseIniFile;
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}
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