I am wondering if there is a way of getting the path to the currently executing lua script file?
This is specifically not the current working directory, which could be
Shortest form which I have found looks like this:
debug.getinfo(1).source:match("@?(.*/)")
Index 1, 2- other - depends on which function in call stack you want to query. 1 is last called function (where you're in). If you're running in global context, then probably 2 is more appropriate (haven't tested by myself)
If you want the real path including the filename, just use the following
pathWithFilename=io.popen("cd"):read'*all'
print(pathWithFilename)
Tested on Windows.
Explanation:
io.popen
- Sends commands to the command line, and returns the output.
"cd"
- when you input this in cmd
you get the current path as output.
:read'*all'
- as io.popen returns a file-like object you can read it with the same kind of commands. This reads the whole output.
If someone requires the UNC path:
function GetUNCPath(path,filename)
local DriveLetter=io.popen("cd "..path.." && echo %CD:~0,2%"):read'*l'
local NetPath=io.popen("net use "..DriveLetter):read'*all'
local NetRoot=NetPath:match("[^\n]*[\n]%a*%s*([%a*%p*]*)")
local PathTMP=io.popen("cd "..path.." && cd"):read'*l'
PathTMP=PathTMP:sub(3,-1)
UNCPath=NetRoot..PathTMP.."\\"..filename
return UNCPath
end
The only reliable way to get what you want is to replace dofile
with your own version of this function. Even the debug.getinfo
method won't work, because it will only return the string passed to dofile
. If that was a relative path, it has no idea how it was converted to an absolute path.
The overriding code would look something like this:
local function CreateDoFile()
local orgDoFile = dofile;
return function(filename)
if(filename) then --can be called with nil.
local pathToFile = extractFilePath(filename);
if(isRelativePath(pathToFile)) then
pathToFile = currentDir() .. "/" .. pathToFile;
end
--Store the path in a global, overwriting the previous value.
path = pathToFile;
end
return orgDoFile(filename); --proper tail call.
end
end
dofile = CreateDoFile(); //Override the old.
The functions extractFilePath
, isRelativePath
, and currentDir
are not Lua functions; you will have to write them yourself. The extractFilePath
function pulls a path string out of a filename. isRelativePath
takes a path and returns whether the given path is a relative pathname. currentDir
simply returns the current directory. Also, you will need to use "\" instead of "/" on Windows machines.
This function stores the path in a global called path
. You can change that to whatever you like.
I have written a function getScriptDir
which uses the debug information like a few other people have suggested, but this one is going to work everytime (at least in Windows). But the thing is there are quite a few lines of code as it uses another function string.cut
which i have created, which separates a string every given pattern, and puts it into a table.
function string.cut(s,pattern)
if pattern == nil then pattern = " " end
local cutstring = {}
local i1 = 0
repeat
i2 = nil
local i2 = string.find(s,pattern,i1+1)
if i2 == nil then i2 = string.len(s)+1 end
table.insert(cutstring,string.sub(s,i1+1,i2-1))
i1 = i2
until i2 == string.len(s)+1
return cutstring
end
function getScriptDir(source)
if source == nil then
source = debug.getinfo(1).source
end
local pwd1 = (io.popen("echo %cd%"):read("*l")):gsub("\\","/")
local pwd2 = source:sub(2):gsub("\\","/")
local pwd = ""
if pwd2:sub(2,3) == ":/" then
pwd = pwd2:sub(1,pwd2:find("[^/]*%.lua")-1)
else
local path1 = string.cut(pwd1:sub(4),"/")
local path2 = string.cut(pwd2,"/")
for i = 1,#path2-1 do
if path2[i] == ".." then
table.remove(path1)
else
table.insert(path1,path2[i])
end
end
pwd = pwd1:sub(1,3)
for i = 1,#path1 do
pwd = pwd..path1[i].."/"
end
end
return pwd
end
Note: if you want to use this function in another OS than Windows, you have to change the io.popen("echo %cd%")
in the line 15 to whatever command gives you present working directory in your OS, e.g. io.popen("pwd")
for Linux, and the pwd2:sub(2,3) == ":/"
in the line 18 to whatever represents the root directory in your OS, e.g. pwd2:sub(1,1) == "/"
for Linux.
Note2: if you don't provide the source
variable to the function via debug.getinfo(1).source
when calling it, then it will return the path to the directory of the file containing this function. Therefore, if you want to get the directory of a file which you called via dofile
or loadfile
, you will have to give it the source, like this: getScriptDir(debug.getinfo(1).source)
.