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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
|
