nixpkgs/pkgs/games/dwarf-fortress/dwarf-therapist/wrapper.nix

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{ symlinkJoin, lib, dwarf-therapist-original, dwarf-fortress-original, makeWrapper }:
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let
df = dwarf-fortress-original;
dt = dwarf-therapist-original;
inifile = "linux/v0${df.baseVersion}.${df.patchVersion}.ini";
dfHashFile = "${df}/hash.md5";
in symlinkJoin {
name = "dwarf-therapist-${dt.version}";
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paths = [ dt ];
buildInputs = [ makeWrapper ];
postBuild = ''
# DwarfTherapist assumes it's run in $out/share/dwarftherapist and
# therefore uses many relative paths.
wrapProgram $out/bin/DwarfTherapist \
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--run "cd $out/share/dwarftherapist"
rm -rf $out/share/dwarftherapist/memory_layouts/linux
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mkdir -p $out/share/dwarftherapist/memory_layouts/linux
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origmd5=$(cat "${dfHashFile}.orig" | cut -c1-8)
patchedmd5=$(cat "${dfHashFile}" | cut -c1-8)
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substitute \
${dt.layouts}/${inifile} \
$out/share/dwarftherapist/memory_layouts/${inifile} \
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--replace "$origmd5" "$patchedmd5"
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'';
}