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nixpkgs/pkgs/development/lua-modules/lib.nix
Matthieu Coudron abc36451d7 lua: create a folder for hooks
- moved lua hooks to a specific folder as I foresee to add more
- moved generateLuarocksConfig to lib
- fix getLuaPath
- removed the useless rockspecDir
2021-09-27 23:42:54 +02:00

132 lines
4.4 KiB
Nix

{ pkgs, lib, lua }:
let
requiredLuaModules = drvs: with lib; let
modules = filter hasLuaModule drvs;
in unique ([lua] ++ modules ++ concatLists (catAttrs "requiredLuaModules" modules));
# Check whether a derivation provides a lua module.
hasLuaModule = drv: drv ? luaModule;
in
rec {
inherit hasLuaModule requiredLuaModules;
luaPathList = [
"share/lua/${lua.luaversion}/?.lua"
"share/lua/${lua.luaversion}/?/init.lua"
];
luaCPathList = [
"lib/lua/${lua.luaversion}/?.so"
];
/* generate paths without a prefix
*/
luaPathRelStr = lib.concatStringsSep ";" luaPathList;
luaCPathRelStr = lib.concatStringsSep ";" luaCPathList;
/* generate LUA_(C)PATH value for a specific derivation, i.e., with absolute paths
*/
genLuaPathAbsStr = drv: lib.concatMapStringsSep ";" (x: "${drv}/${x}") luaPathList;
genLuaCPathAbsStr = drv: lib.concatMapStringsSep ";" (x: "${drv}/${x}") luaCPathList;
/* Generate a LUA_PATH with absolute paths
*/
# genLuaPathAbs = drv:
# lib.concatStringsSep ";" (map (x: "${drv}/x") luaPathList);
luaAtLeast = lib.versionAtLeast lua.luaversion;
luaOlder = lib.versionOlder lua.luaversion;
isLua51 = (lib.versions.majorMinor lua.version) == "5.1";
isLua52 = (lib.versions.majorMinor lua.version) == "5.2";
isLua53 = lua.luaversion == "5.3";
isLuaJIT = lib.getName lua == "luajit";
/* generates the relative path towards the folder where
seems stable even when using lua_modules_path = ""
Example:
getDataFolder luaPackages.stdlib
=> stdlib-41.2.2-1-rocks/stdlib/41.2.2-1/doc
*/
getDataFolder = drv:
"${drv.pname}-${drv.version}-rocks/${drv.pname}/${drv.version}";
/* Convert derivation to a lua module.
so that luaRequireModules can be run later
*/
toLuaModule = drv:
drv.overrideAttrs( oldAttrs: {
# Use passthru in order to prevent rebuilds when possible.
passthru = (oldAttrs.passthru or {}) // {
luaModule = lua;
requiredLuaModules = requiredLuaModules drv.propagatedBuildInputs;
};
});
/* generate luarocks config
generateLuarocksConfig {
externalDeps = [ { name = "CRYPTO"; dep = pkgs.openssl; } ];
rocksSubdir = "subdir";
};
*/
generateLuarocksConfig = {
externalDeps
, requiredLuaRocks
, extraVariables ? {}
, rocksSubdir
}: let
rocksTrees = lib.imap0
(i: dep: "{ name = [[dep-${toString i}]], root = '${dep}', rocks_dir = '${dep}/${dep.rocksSubdir}' }")
requiredLuaRocks;
# Explicitly point luarocks to the relevant locations for multiple-output
# derivations that are external dependencies, to work around an issue it has
# (https://github.com/luarocks/luarocks/issues/766)
depVariables = lib.concatMap ({name, dep}: [
"${name}_INCDIR='${lib.getDev dep}/include';"
"${name}_LIBDIR='${lib.getLib dep}/lib';"
"${name}_BINDIR='${lib.getBin dep}/bin';"
]) externalDeps';
# example externalDeps': [ { name = "CRYPTO"; dep = pkgs.openssl; } ]
externalDeps' = lib.filter (dep: !lib.isDerivation dep) externalDeps;
externalDepsDirs = map
(x: "'${builtins.toString x}'")
(lib.filter (lib.isDerivation) externalDeps);
extraVariablesStr = lib.concatStringsSep "\n "
(lib.mapAttrsToList (k: v: "${k}='${v}';") extraVariables);
in ''
local_cache = ""
-- To prevent collisions when creating environments, we install the rock
-- files into per-package subdirectories
rocks_subdir = '${rocksSubdir}'
-- Then we need to tell luarocks where to find the rock files per
-- dependency
rocks_trees = {
${lib.concatStringsSep "\n, " rocksTrees}
}
'' + lib.optionalString lua.pkgs.isLuaJIT ''
-- Luajit provides some additional functionality built-in; this exposes
-- that to luarock's dependency system
rocks_provided = {
jit='${lua.luaversion}-1';
ffi='${lua.luaversion}-1';
luaffi='${lua.luaversion}-1';
bit='${lua.luaversion}-1';
}
'' + ''
-- For single-output external dependencies
external_deps_dirs = {
${lib.concatStringsSep "\n, " externalDepsDirs}
}
variables = {
-- Some needed machinery to handle multiple-output external dependencies,
-- as per https://github.com/luarocks/luarocks/issues/766
${lib.optionalString (lib.length depVariables > 0) ''
${lib.concatStringsSep "\n " depVariables}''}
${extraVariablesStr}
}
'';
}