I have a directory laid out :
-parent
-target
-current
-firstChild
-secondChild
I am trying to direct my package.path from inside "secondChild" to "target" to retrieve other .lua folders stashed there. I have this set up currently
package.path = package.path .. ';../?.lua;../?.lua;../?.lua;target/?.lua'
That doesn't find what I'm looking for and I'm sure that part of my problem is that I do not understand all of the syntaxes. ";../?.lua" says, to me, that I am dropping back to "firstChild" and checking to see if there are lua files?
What am I missing here?
Given your (updated) directory structure you need to have ../../../target/?.lua in package.path to reference modules in target folder from secondChild. ?.lua will search in secondChild, ../?.lua will search in firstChild, ../../?.lua will search in current, ../../../?.lua will search in parent and ../../../target/?.lua will search in target (assuming your current directory is secondChild when you start your script and also assuming that - is not part of the directory name). Having ../?.lua only makes the search to happen in the parent of secondChild and having target/?.lua makes the search to happen in secondChild/target/ folder, which doesn't exist.
The error message you get when you try to "require" a module includes all the paths that have been checked by the search, which usually provides a clue as to how the search path should be modified.
Related
So i've been trying to figure this out, im doing the following
main.lua:
package.path = io.popen("cd"):read'*all' -- to set the path the same as main.lua (for exporting)
local u = require("utilities") -- this is the line that dosent work
utilities.lua:
local u = {}
function u.GetService(s)
return require(tostring(s))
end
function u.Wait(s)
local ntime = os.clock() + s/10
repeat until os.clock() > ntime
end
function u.NPWait(s)
local ntime = os.time() + s
repeat until os.time() > ntime
end
return u
The error:
module 'utilities' not found:
Then here goes a search that DOES look in the correct folder, however it looks for .dll files
Require has never been something I've been good at, Sometimes I get it to work, sometimes it breaks like this, if someone can help me understand how to fix this then thank you, as this has been annoying me every so often
You're misunderstanding package.path.
Unlike the PATH variable used by windows and linux, in Lua you don't just tell it what directory to look in but also what the files should look like.
What you're doing is erasing the default search paths completely and replacing it with a broken path that won't find any files.
Generally speaking, to add a new directory to your path, you should add both C:\path\to\your\files\?.lua, and C:\path\to\your\files\?\init.lua, which are the two ways Lua loads modules by default.
You also shouldn't replace package.path, because you're keeping modules from being loaded elsewhere.
Your code should look somewhat like this:
local cd = io.popen("cd")
package.path = cd:read('*line') .. "\\?.lua;" .. package.path
cd:close()
The reason why it's still looking for DLL files is that package.cpath is separate, so you're not changing that.
require("utilities.lua") should work.
You have to specify how to get from the required name to the file. For example by adding a path and a file extension to it.
If you want to require c:\folder\script.lua with require("script") your package.path must contain something like c:\folder\?.lua where ? is replaced by the required name.
If you have your module in a folder with its name and let's say a init.lua for that module the path is c:\folder\?\init.lua
Just print the original package.path and see what's inside befor you overwrite it.
Refer to Lua Reference Manual 6.3 Modules: package.searchpath
A path is a string containing a sequence of templates separated by
semicolons. For each template, the function replaces each
interrogation mark (if any) in the template with a copy of name
wherein all occurrences of sep (a dot, by default) were replaced by
rep (the system's directory separator, by default), and then tries to
open the resulting file name.
For instance, if the path is the string
"./?.lua;./?.lc;/usr/local/?/init.lua" the search for the name foo.a will try to open the files ./foo/a.lua, ./foo/a.lc, and
/usr/local/foo/a/init.lua, in that order.
I'm trying to repackage into a Docker container some Lua library that is made of the main module and some helper modules. The helper modules are kept inside a subfolder of the library so that imports from the main file are done as
require 'helpers/SomeHelper'
The problem is: because of the way I want the Docker container to work, it would be extremely helpful if I can invoke this library from a different working folder. That is, my call to the main program would be something like
th /app/main.lua
regardless of the actual working directory I'm standing. Unfortunately, relative imports seem to fail when the working directory is different from the directory where the main file is located.
Is there any way I can configure LUA_PATH or any other mechanism to make these imports work correctly? Note that changing the code of the library itself would be a poor solution, as it wasn't developed by me and I would like to be able to update it to newer versions easily.
If you don't care about the working directory, you can just load lfs / LuaFileSytem and use lfs.chdir( src_dir ) to change to the source directory (potentially saving the current working directory with lfs.currentdir( ) first.)
You can also extend the search path of Lua so that it will search those extra directories. The search is driven by package.searchpath. To add a directory /foo/bar/ to the search in a way that supports all normally supported library layouts, add
/foo/bar/?.lua;/foo/bar/?/init.lua to package.path
/foo/bar/?.so (or .dylib or .dll on other OSen) to package.cpath
You can use several ways to extend the path.
One option that works well is to set the LUA_PATH / LUA_CPATH environment variables. (A ;; sequence in one of them will expand to the full default path.) This can be done from .profile or other setup scripts via an earlier export LUA_PATH="..." or (if started from a wrapper script) inline by setting variables just for that call LUA_PATH="..." lua /foo/bar.lua. (Note that if you export this variable in too broad a scope, other Lua scripts will also get their path extended and may find potentially incompatible Lua libraries.)
(You can also manually modify package.(c)path from LUA_INIT. That way, you won't be able to independently disable LUA_INIT or LUA_PATH, but you can use all of Lua to generate the path dynamically.)
A third option (this may be best in your specific case) is to put the extension of package.path at the top of your main script, as in
do
local dir = (arg[0]:match "^(.*)/$")
if dir then -- else cwd is . which works by default
package.path = dir.."/?.lua;"..dir.."/?/init.lua;"..package.path
package.cpath = dir.."/?.so;"..package.cpath
end
end
-- rest of your program goes here
When running a script with the Lua interpreter, arg[0] is the script. So this extends the path to include the program's directory no matter where it is located, and it will only affect the search path of this particular script / program.
You should not forget about that not all modules are loaded from FS directly.
E.g. to improve perfomance it is possible read/compile file to memory and then
use preload table to provide way to load module from memory.
Basic example
--- preload code. It can be done by host application.
local FooUtils = function()
return {
print = function(...)
print("foo", ...)
end
}
end
local Foo = function()
local Utils = require "foo.utils"
return {
foo = function()
Utils.print"hello"
end
}
end
package.preload['foo.utils'] = FooUtils
package.preload['foo'] = Foo
--- main application
require "foo".foo()
In this example assume that FooUtils and Foo just example of compiled modules.
E.g. it can be like FooUtils = loadstring('path/to/utils.lua) and it can be done
even in separate Lua state and then used in any other.
It is important to remember that Foo module have no idea about how host application does lookup of foo.utils.
So there no standart way to provide original file path or relevant paths.
So if you write some module wich relays on relative paths then this module
may be not working in some environments.
So I just suggest use full namespace like require 'foo.utils' instead of require 'utils'
So in lua, i want to import a module.
I want to have my "polygon" lib in a subfolder, so i reference it like this
local polygon = require('polygon.polygon')
however, it needs another module called 'delaunay', it cannot find it as it checks the main folder
Is there anyway short of editing my library, to get this to work? (some kind of ability to add search paths?)
Thanks
To know where to look for modules, Lua's require uses the variables package.path (.lua) and package.cpath (.so/.dll). You can change them in your program to look in the directory you have it in. For consistency's sake, you can look at their contents to know which OS-specific separator to use. For example:
local sep = package.path:find("\\") and "\\" or "/"
package.path = package.path .. ";." .. sep .. "polygon" .. sep .. "?.lua"
This would include ./polygon/?.lua into the search path, and a call to require "delaunay" would therefore have the require function look for ./polygon/delaunay.lua in addition to existing paths. Bear in mind that in require strings, . denotes a separator as far as file searching is concerned, so calling require "polygon.delaunay" in this scenario will mean searching for ./polygon/polygon/delaunay.lua.
From what I understand of your question, changing the package.path variable to include the path to where your delaunay library is stored would solve your issue, although to give a specific solution more information about your project and directory structure is required.
All what loaded into package.loaded can be load with require() because require() looks first in package.loaded...
-- Lua 5.3 ( lua -i )
> package.loaded.code=load(code.dump)()
> test=require('code')
> test
function: 0x565cb820
So you can use load() or loadfile('/path/to/your_code.lua') to do this. Another nice feature of this method is to load dumped code...
> package.loaded.shell=loadfile('shell.bin')
> shell=require('shell')
> shell('cat shell.bin')
uaS�
�
xV(w#F#�d�#��F�#G���d#��F�#G���d#&�typestringoexecute
/bin/bash>
In any way, it appears that you will have to deal with the subfolders explicitly.
As in, either the module polygon will have to import delaunay as polygon.delaunay.
Or module names will have to be appended to package.path so that lua could search through subfolders for filenames:
package.path=package.path..";./polygon/?.lua"
More info is here.
It is pointed out in comments, you'd probably want to ensure that path concatenation happens only once.
Also, one should be wary of name shadowing.
Finally, while we are at stirring up the past, a pretty nifty trick to solve the issue was proposed here five years before the question.
usually when I have a question about something remotely software related I find that someone else has already asked the very same thing, and gotten good answers that works for me too.
This time, though, I've failed to find an answer to my predicament.
Here we go:
I'm currently trying to move up my Lua-programming a notch or three and want to use modules. So, I've got a structure like this:
main.lua
foo/bar.lua
Now, in main.lua I do
require("foo.bar")
which fails,
main.lua:1 module 'foo.bar' not found:
no field package.preload['foo.bar']
no file 'foo.bar.lua'
no file 'foo.bar.lua'
no file 'foo.lua'
Ok, something might be wrong with my package.path so I use package.searchpath("foo.bar", package.path) to see what I', doing wrong.
The problem is that package.searchpath resolves foo.bar to foo/bar.lua which is exactly right.
As I've understood it, package.searchpath tries to find the module in the same way as require, but there seems to be som glitch in my case.
What strikes me as odd is the repetition of the no file 'foo.bar.lua' in the error output
Have I misunderstood the use of require?
I'm using LuaJIT-2.0.0 to run my chunks
Update:
I'm using LuaJIT-2.0.0 to run my chunks <- This was the reason for my problem, stock Lua-5.2.2 behaves as expected
package.path = debug.getinfo(1,"S").source:match[[^#?(.*[\/])[^\/]-$]] .."?.lua;".. package.path
require("foo.bar")
This line causes require to look in the same directory as the
current file when asked to load other files. If you want it to instead
search a directory relative to the current directory, insert the
relative path between " and ?.lua
Here is part of require description:
[...] Otherwise require searches for a Lua loader using the path stored in
package.path. If that also fails, it searches for a C loader using the
path stored in package.cpath. If that also fails, it tries an
all-in-one loader (see package.loaders).
Default path for package.path is always the .exe that executes specified script.
Let me explain my situation with some dummy file names.
I am working in directory 'A' which has a sub directory 'a'. I am running a function 'func1' which is present in both folders. 'func1' needs 'file1' & 'file2' during its execution. 'file1' & 'file2' are present in both folders with some parameters changed inside them. It is not possible for me to change file names at all.
Now, the problem is that when I am running 'func1' in 'A', everything is working fine. But, when I run 'func1' in 'a' using 'addpath/rmpath', rather than using 'file1' & 'file2' from 'a', it is using 'file1' & 'file2' from 'A' which is producing wrong results.
Please tell me how can I change path so that when I run 'func1' in sub directory 'a', it always use 'file1' & 'file2' from 'a' rather than directory 'A'.
I hope I am clear in my explanation :S
If I have understood correctly, you are hoping that if you use addpath to add the subdirectory to the search path, Matlab will give the search path precedence over the current directory. Unfortunately, it is precisely the other way around, as per the Matlab documentation: "Functions in the current folder take precedence over functions with the same file name that reside anywhere on the search path." - and this also applies to the load function when reading data files. (incidentally, I suspect that for this reason you are also not running the version of func1 that you think you are running - try typing which func1 to find out).
Anyway, the solution here is to make sure that Matlab picks the right version of file1 and file2, which you could do in several ways:
Change your working directory to a, since the working directory has precedence: cd a
Put the two versions into separate subfolders, e.g. a and b, and use addpath to add them separatley
Change the different versions of func1 to have explicit references to the files, i.e. load('./a/file1')
With addpath and rmpath you modify the search path in Matlab. Your search path basically is a list of folders where Matlab looks for functions. Not for files you want to open.
If you have your files in folder A and this is your current working directory, Matlab will look for the files in A. If you change to a and change your working directory accordingly, Matlab will open the files in a - this has nothing to do with your search path. If you want to open files from a specific directory, use the entire path in the open command:
fileID = fopen('/path/to/A/file1');
In your case, the case may be that the fopen is applied in the way explained above. If you want Matlab to always open files from the current working directory, change it to:
fileID = fopen('file1');