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|
--
-- path.lua
-- Path manipulation functions.
-- Copyright (c) 2002-2008 Jason Perkins and the Premake project
--
path = { }
--
-- Get the absolute file path from a relative path. The requested
-- file path doesn't actually need to exist.
--
function path.getabsolute(p)
-- normalize the target path
p = path.translate(p, "/")
if (p == "") then p = "." end
-- if the directory is already absolute I don't need to do anything
if (path.isabsolute(p)) then
return p
end
-- split up the supplied relative path and tackle it bit by bit
local result = os.getcwd()
for _,part in ipairs(p:explode("/", true)) do
if (part == "..") then
result = path.getdirectory(result)
elseif (part ~= ".") then
result = result .. "/" .. part
end
end
return result
end
--
-- Retrieve the filename portion of a path, without any extension.
--
function path.getbasename(p)
local name = path.getname(p)
local i = name:findlast(".", true)
if (i) then
return name:sub(1, i - 1)
else
return name
end
end
--
-- Retrieve the directory portion of a path, or an empty string if
-- the path does not include a directory.
--
function path.getdirectory(p)
local i = p:findlast("/", true)
if (i) then
if i > 1 then i = i - 1 end
return p:sub(1, i)
else
return "."
end
end
--
-- Retrieve the file extension.
--
function path.getextension(p)
local i = p:findlast(".", true)
if (i) then
return p:sub(i)
else
return ""
end
end
--
-- Retrieve the filename portion of a path.
--
function path.getname(p)
local i = p:findlast("/", true)
if (i) then
return p:sub(i + 1)
else
return p
end
end
--
-- Returns the relative path from src to dest.
--
function path.getrelative(src, dst)
local result = ""
-- normalize the two paths
src = path.getabsolute(src) .. "/"
dst = path.getabsolute(dst) .. "/"
-- same directory?
if (src == dst) then
return "."
end
-- trim off the common directories from the front
local i = src:find("/")
while (i) do
if (src:sub(1,i) == dst:sub(1,i)) then
src = src:sub(i + 1)
dst = dst:sub(i + 1)
else
break
end
i = src:find("/")
end
-- back up from dst to get to this common parent
i = src:find("/")
while (i) do
result = result .. "../"
i = src:find("/", i + 1)
end
-- tack on the path down to the dst from here
result = result .. dst
-- remove the trailing slash
return result:sub(1, -2)
end
--
-- Returns true if the path is absolute.
--
function path.isabsolute(p)
local ch1 = p:sub(1,1)
local ch2 = p:sub(2,2)
return (ch1 == "/" or ch1 == "\\" or ch2 == ":")
end
--
-- Returns true if the filename represents a C/C++ source code file. This check
-- is used to prevent passing non-code files to the compiler in makefiles. It is
-- not foolproof, but it has held up well. I'm open to better suggestions.
--
function path.iscfile(fname)
local extensions = { ".c", ".s" }
local ext = path.getextension(fname):lower()
return table.contains(extensions, ext)
end
function path.iscppfile(fname)
local extensions = { ".cc", ".cpp", ".cxx", ".c", ".s" }
local ext = path.getextension(fname):lower()
return table.contains(extensions, ext)
end
--
-- Returns true if the filename represents a Windows resource file. This check
-- is used to prevent passing non-resources to the compiler in makefiles.
--
function path.isresourcefile(fname)
local extensions = { ".rc" }
local ext = path.getextension(fname):lower()
return table.contains(extensions, ext)
end
--
-- Join two pieces of a path together into a single path.
--
function path.join(leading, trailing)
if (not leading) then
leading = ""
end
if (not trailing) then
return leading
end
if (path.isabsolute(trailing)) then
return trailing
end
if (leading == ".") then
leading = ""
end
if (leading:len() > 0 and not leading:endswith("/")) then
leading = leading .. "/"
end
return leading .. trailing
end
--
-- Convert the separators in a path from one form to another. If `sep`
-- is nil, then a platform-specific separator is used.
--
function path.translate(p, sep)
if (not sep) then
if (os.windows) then
sep = "\\"
else
sep = "/"
end
end
return p:gsub("[/\\]", sep)
end
|
