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71 lines
2.3 KiB
Nix
71 lines
2.3 KiB
Nix
{ lib
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, fetchurl
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, python3
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, readline
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, stdenv
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, enableCurrenciesUpdater ? true
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}:
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let
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pythonEnv = python3.withPackages(p: [
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p.requests
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]);
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in stdenv.mkDerivation (finalAttrs: {
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pname = "units";
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version = "2.23";
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src = fetchurl {
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url = "mirror://gnu/units/units-${finalAttrs.version}.tar.gz";
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hash = "sha256-2Ve0USRZJcnmFMRRM5dEljDq+SvWK4SVugm741Ghc3A=";
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};
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outputs = [ "out" "info" "man" ];
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buildInputs = [
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readline
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] ++ lib.optionals enableCurrenciesUpdater [
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pythonEnv
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];
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prePatch = lib.optionalString enableCurrenciesUpdater ''
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substituteInPlace units_cur \
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--replace "#!/usr/bin/env python" ${pythonEnv}/bin/python
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'';
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postInstall = lib.optionalString enableCurrenciesUpdater ''
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cp units_cur ${placeholder "out"}/bin/
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'';
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doCheck = true;
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meta = {
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homepage = "https://www.gnu.org/software/units/";
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description = "Unit conversion tool";
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longDescription = ''
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GNU Units converts quantities expressed in various systems of measurement
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to their equivalents in other systems of measurement. Like many similar
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programs, it can handle multiplicative scale changes. It can also handle
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nonlinear conversions such as Fahrenheit to Celsius or wire gauge, and it
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can convert from and to sums of units, such as converting between meters
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and feet plus inches.
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Beyond simple unit conversions, GNU Units can be used as a general-purpose
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scientific calculator that keeps track of units in its calculations. You
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can form arbitrary complex mathematical expressions of dimensions
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including sums, products, quotients, powers, and even roots of
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dimensions. Thus you can ensure accuracy and dimensional consistency when
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working with long expressions that involve many different units that may
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combine in complex ways.
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The units are defined in an external data file. You can use the extensive
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data file that comes with this program, or you can provide your own data
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file to suit your needs. You can also use your own data file to supplement
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the standard data file.
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'';
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license = with lib.licenses; [ gpl3Plus ];
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mainProgram = "units";
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maintainers = with lib.maintainers; [ AndersonTorres ];
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platforms = lib.platforms.all;
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};
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})
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