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# Contains the ruby version heuristics
{ lib }:
let
# The returned set should be immutable
rubyVersion = major: minor: tiny: tail:
rec {
inherit major minor tiny tail;
# Contains the patch number "223" if tail is "p223" or null
patchLevel =
let
p = lib.removePrefix "p" tail;
isPosInt = num:
0 == lib.stringLength
(lib.replaceStrings
["0" "1" "2" "3" "4" "5" "6" "7" "8" "9"]
["" "" "" "" "" "" "" "" "" "" ]
num);
in
if lib.hasPrefix "p" tail && isPosInt p then p
else null;
# Shortcuts
majMin = "${major}.${minor}";
majMinTiny = "${major}.${minor}.${tiny}";
# Ruby separates lib and gem folders by ABI version which isn't very
# consistent.
libDir =
if lib.versionAtLeast majMinTiny "2.1.0" then
"${majMin}.0"
else if lib.versionAtLeast majMinTiny "2.0.0" then
"2.0.0"
else if lib.versionAtLeast majMinTiny "1.9.1" then
"1.9.1"
else
throw "version ${majMinTiny} is not supported";
# How ruby releases are tagged on github.com/ruby/ruby
gitTag =
let
base = "v${major}_${minor}_${tiny}";
in
if patchLevel != null then
"${base}_${patchLevel}"
else
if tail != "" then
"${base}_${tail}"
else
base;
# Implements the builtins.toString interface.
__toString = self:
self.majMinTiny + (
if self.patchLevel != null then
"-p${self.patchLevel}"
else
lib.optionalString (self.tail != "") "-${self.tail}"
);
};
in
rubyVersion
|