diff options
Diffstat (limited to 'luatexbase-loader.dtx')
| -rw-r--r-- | luatexbase-loader.dtx | 88 |
1 files changed, 55 insertions, 33 deletions
diff --git a/luatexbase-loader.dtx b/luatexbase-loader.dtx index 0a3945f..8f01924 100644 --- a/luatexbase-loader.dtx +++ b/luatexbase-loader.dtx @@ -150,14 +150,16 @@ See source file '\inFileName' for details. % |foo/bar| using Kpathsea with the format |lua| (that is, search along % |LUAINPUTS| and try the following extensions: |.luc|, |.luctex|, |.texluc|, % |.lua|, |.luatex|, |.texlua|). If this search fails, it falls back to -% |foo.bar|. +% |foo.bar| (along the same path with the same extensions). % % Also, older versions of \luatex, such as 0.25.4 (\texlive 2008), don't know % about the |lua| format for kpse searching. So, an emulator for this function % is provided. The emulator is not perfect, in particular it may find more -% results than the normal |lua| format search. In order to ensure more -% homogeneous results across versions, this emulator is used as a fall-back -% when the real |lua| format search doesn't find any result. +% results than the normal |lua| format search.\footnote{An may also fail to +% find the file in particular cases, see comments in the implementation for +% details.} In order to ensure more homogeneous results across versions, this +% emulator is used as a fall-back when the real |lua| format search doesn't +% find any result. % % Finally, a combined version of this new kpse searcher and the original % function at |package.loaders[2]| (using first the new loader, then the old @@ -295,42 +297,62 @@ See source file '\inFileName' for details. module('luatexbase', package.seeall) % \end{macrocode} % -% Emulate (approximatively) kpse's lua format search. +% Emulate (approximatively) kpse's lua format search. More precisely, +% combine the search path of |texmfscripts| and |tex| in order to +% approximate |LUAINPUTS|. But we need to handle suffixes ourselves. % -% |lua_search_suffixes| is taken verbatim from Kpathsea's source +% |lua_suffixes| is taken verbatim from Kpathsea's source % (\file{tex-file.c}, constant |LUA_SUFFIXES|),\footnote{Unchanged since -% 2007-07-06, last checked 2010-05-10.} except for the addition of the -% empty string at the beginning (since this is what kpse does: first try -% without adding a suffix). -% -% There is a problem with using the |tex| search format: kpse will try to -% add suffixes from the |TEX_SUFFIXES| constant, which leads to problems -% when a file \meta{name}|.tex| exists. We prevent that by checking the -% extension of the file found. +% 2007-07-06, last checked 2010-05-10.}. % % \begin{macrocode} -local lua_search_suffixes = { - "", ".luc", ".luctex", ".texluc", ".lua", ".luatex", ".texlua", - } -local lua_valid_suffixes = { - luc = true, - lua = true, - luctex = true, - texluc = true, - luatex = true, - texlua = true, +local lua_suffixes = { + ".luc", ".luctex", ".texluc", ".lua", ".luatex", ".texlua", } -local function find_file_lua_emul(name) - for _, suf in ipairs(lua_search_suffixes) do - local name = name..suf +% \end{macrocode} +% +% Auxiliary function for suffixes: says if |suffix| is a suffix of |name|. +% +% \begin{macrocode} +local function ends_with(suffix, name) + return name:sub(-suffix:len()) == suffix +end +% \end{macrocode} +% +% The search function first builds the list of filenames to be search. For +% the lua format, kpse always adds a suffix if no (known) suffix is +% present, so we do the same. +% +% \begin{macrocode} +function find_file_lua_emul(name) + local search_list = {} + for _, suffix in ipairs(lua_suffixes) do + if ends_with(suffix, name) then + search_list = { name } + break + else + table.insert(search_list, name..suffix) + end + end +% \end{macrocode} +% +% Now look for each file in this list. +% +% \begin{macrocode} + for _, search_name in ipairs(search_list) do local f = kpse.find_file(name, 'texmfscripts') or kpse.find_file(name, 'tex') - if suf == "" and f then - local ext = string.match(f,"^.+%.([^/\\]-)$") - if lua_valid_suffixes[suf] then - return f - end - elseif f then +% \end{macrocode} +% +% There is a problem with using the |tex| search format: kpse will try to +% add suffixes from the |TEX_SUFFIXES| list, which may lead to problems +% if a file like \meta{name}|.lua.tex| exists. We prevent that by checking if +% the file found ends with the required name. So \meta{name}|.lua| will +% still be hidden by \meta{name}.|lua.tex| but it seems less bad not to +% find it than to return an incorrect result. +% +% \begin{macrocode} + if f and ends_with(search_name, f) then return f end end |