diff options
Diffstat (limited to 'Master/texmf-dist/tex/luatex/luapackageloader')
-rw-r--r-- | Master/texmf-dist/tex/luatex/luapackageloader/luapackageloader.lua | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/luatex/luapackageloader/luapackageloader.lua b/Master/texmf-dist/tex/luatex/luapackageloader/luapackageloader.lua new file mode 100644 index 00000000000..7ebd5b63e31 --- /dev/null +++ b/Master/texmf-dist/tex/luatex/luapackageloader/luapackageloader.lua @@ -0,0 +1,71 @@ +-- Author: Deepak Jois +-- License: http://www.latex-project.org/lppl.txt +-- Date: 2017/05/26 +-- Version: 0.1 +local luapackageloader = {} + +-- Cache the current kpse based searchers +local kpse_lua_searcher = package.searchers[2] +local kpse_clua_searcher = package.searchers[3] + +-- Emulates the default package.searchers[2] searcher. +local function lua_searcher(name) + local file, err = package.searchpath(name,package.path) + if err then + return string.format("[lua searcher]: module not found: '%s'%s", name, err) + else + return loadfile(file) + end +end + +-- Emulates the default package.searchers[3] searcher. +local function clua_searcher(name) + local file, err = package.searchpath(name, package.cpath) + if err then + return string.format("[lua C searcher]: module not found: '%s'%s", name,err) + else + local symbol = name:gsub("%.","_") + return package.loadlib(file, "luaopen_"..symbol) + end +end + +local function combine_searchers(searcher1, searcher2) + return function(name) + local loader1 = searcher1(name) + if type(loader1) == "string" then -- Not found using searcher1. Try searcher2. + local loader2 = searcher2(name) + if type(loader2) == "string" then -- Not found using searcher2. Return error. + return string.format("%s\n\t%s", loader1, loader2) + end + return loader2 + end + return loader1 + end +end + +--- Use package.path and package.cpath to find Lua modules, +-- in case kpse searching fails. +-- +-- Package searching logic is overridden by default in LuaTeX to use kpse. +-- Calling this function reverts the searchers to use package.path and +-- package.cpath, if the kpse based searcher is not able to locate +-- a module. +-- +-- Package Loading References: +-- 1. http://www.lua.org/manual/5.2/manual.html#pdf-package.searchers +-- 2. LuaTeX Manual, Section 3.2, Lua behavior +function luapackageloader.add_lua_searchers() + package.searchers[2] = combine_searchers(kpse_lua_searcher, lua_searcher) + package.searchers[3] = combine_searchers(kpse_clua_searcher, clua_searcher) +end + +--- Restore the kpse package searchers that are used by default in LuaTeX. +-- +-- Call this to restore the default LuaTeX behavior for searching packages, +-- if you had earlier overridden it using `luapackageloader.add_lua_searchers()`. +function luapackageloader.restore_kpse_searchers() + package.searchers[2] = kpse_lua_searcher + package.searchers[3] = kpse_clua_searcher +end + +return luapackageloader |