On 26 September 2013 01:20, Gary V. Vaughan <g...@vaughan.pe> wrote:
> In the rockspec for Zile I have:
>
> build = {
> copy_directories = { "bin", "doc" },
> …
> }
>
> Where the doc directory contains COPYING, FAQ and some other stuff I'd like
> to display with a key chord invoked from Zmacs.
>
> How do I find the contents of the copied doc tree from Lua (so that it works
> regardless of the rocks tree location that contains it)?
Finding resource files portably and with relocatable packages is
always tricky...
I tried a first approach at tackling this problem with this:
https://github.com/hishamhm/datafile
I just tested it with zile, and I had to make a minor tweak in
LuaRocks to make it work (LuaRocks tested for Lua 5.1 by checking "if
setfenv then" and looks like there's a checker for undeclared globals
in zile that doesn't like this). After I made the tweak in LR (now in
git) I was able do to this in zmacs/main.lua:
local datafile = require("datafile")
local PATH_FAQ = datafile.path("doc/FAQ")
and the LuaRocks-aware opener was able to find the file.
datafile is alpha-quality software though, but I really think we need
a small portable library to avoid hardcoding paths to resource files.
Unix people don't care a lot about making binary installations
relocatable (even though I think they should), but on Windows at least
I think it's expected that software shouldn't break if you choose to
install a binary in a different folder.
(datafile supports 'contexts' which helps it finding files. I have
'config' and 'cache' right now as predefined contexts, which are
inspired by freedesktop.org paths; "doc" probably deserves to be a
predefined context as well.)
-- Hisham
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