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|
--- Path manipulation and file queries.
--
-- This is modelled after Python's os.path library (10.1); see @{04-paths.md|the Guide}.
--
-- NOTE: the functions assume the paths being dealt with to originate
-- from the OS the application is running on. Windows drive letters are not
-- to be used when running on a Unix system for example. The one exception
-- is Windows paths to allow both forward and backward slashes (since Lua
-- also accepts those)
--
-- Dependencies: `pl.utils`, `lfs`
-- @module pl.path
-- imports and locals
local _G = _G
local sub = string.sub
local getenv = os.getenv
local tmpnam = os.tmpname
local package = package
local append, concat, remove = table.insert, table.concat, table.remove
local utils = require 'pl.utils'
local assert_string,raise = utils.assert_string,utils.raise
local res,lfs = _G.pcall(_G.require,'lfs')
if not res then
error("pl.path requires LuaFileSystem")
end
local attrib = lfs.attributes
local currentdir = lfs.currentdir
local link_attrib = lfs.symlinkattributes
local path = {}
local function err_func(name, param, err, code)
local ret = ("%s failed"):format(tostring(name))
if param ~= nil then
ret = ret .. (" for '%s'"):format(tostring(param))
end
ret = ret .. (": %s"):format(tostring(err))
if code ~= nil then
ret = ret .. (" (code %s)"):format(tostring(code))
end
return ret
end
--- Lua iterator over the entries of a given directory.
-- Implicit link to [`luafilesystem.dir`](https://keplerproject.github.io/luafilesystem/manual.html#reference)
-- @function dir
path.dir = lfs.dir
--- Creates a directory.
-- Implicit link to [`luafilesystem.mkdir`](https://keplerproject.github.io/luafilesystem/manual.html#reference)
-- @function mkdir
path.mkdir = function(d)
local ok, err, code = lfs.mkdir(d)
if not ok then
return ok, err_func("mkdir", d, err, code), code
end
return ok, err, code
end
--- Removes a directory.
-- Implicit link to [`luafilesystem.rmdir`](https://keplerproject.github.io/luafilesystem/manual.html#reference)
-- @function rmdir
path.rmdir = function(d)
local ok, err, code = lfs.rmdir(d)
if not ok then
return ok, err_func("rmdir", d, err, code), code
end
return ok, err, code
end
--- Gets attributes.
-- Implicit link to [`luafilesystem.attributes`](https://keplerproject.github.io/luafilesystem/manual.html#reference)
-- @function attrib
path.attrib = function(d, r)
local ok, err, code = attrib(d, r)
if not ok then
return ok, err_func("attrib", d, err, code), code
end
return ok, err, code
end
--- Get the working directory.
-- Implicit link to [`luafilesystem.currentdir`](https://keplerproject.github.io/luafilesystem/manual.html#reference)
-- @function currentdir
path.currentdir = function()
local ok, err, code = currentdir()
if not ok then
return ok, err_func("currentdir", nil, err, code), code
end
return ok, err, code
end
--- Gets symlink attributes.
-- Implicit link to [`luafilesystem.symlinkattributes`](https://keplerproject.github.io/luafilesystem/manual.html#reference)
-- @function link_attrib
path.link_attrib = function(d, r)
local ok, err, code = link_attrib(d, r)
if not ok then
return ok, err_func("link_attrib", d, err, code), code
end
return ok, err, code
end
--- Changes the working directory.
-- On Windows, if a drive is specified, it also changes the current drive. If
-- only specifying the drive, it will only switch drive, but not modify the path.
-- Implicit link to [`luafilesystem.chdir`](https://keplerproject.github.io/luafilesystem/manual.html#reference)
-- @function chdir
path.chdir = function(d)
local ok, err, code = lfs.chdir(d)
if not ok then
return ok, err_func("chdir", d, err, code), code
end
return ok, err, code
end
--- is this a directory?
-- @string P A file path
function path.isdir(P)
assert_string(1,P)
if P:match("\\$") then
P = P:sub(1,-2)
end
return attrib(P,'mode') == 'directory'
end
--- is this a file?
-- @string P A file path
function path.isfile(P)
assert_string(1,P)
return attrib(P,'mode') == 'file'
end
-- is this a symbolic link?
-- @string P A file path
function path.islink(P)
assert_string(1,P)
if link_attrib then
return link_attrib(P,'mode')=='link'
else
return false
end
end
--- return size of a file.
-- @string P A file path
function path.getsize(P)
assert_string(1,P)
return attrib(P,'size')
end
--- does a path exist?
-- @string P A file path
-- @return the file path if it exists (either as file, directory, socket, etc), nil otherwise
function path.exists(P)
assert_string(1,P)
return attrib(P,'mode') ~= nil and P
end
--- Return the time of last access as the number of seconds since the epoch.
-- @string P A file path
function path.getatime(P)
assert_string(1,P)
return attrib(P,'access')
end
--- Return the time of last modification as the number of seconds since the epoch.
-- @string P A file path
function path.getmtime(P)
assert_string(1,P)
return attrib(P,'modification')
end
---Return the system's ctime as the number of seconds since the epoch.
-- @string P A file path
function path.getctime(P)
assert_string(1,P)
return path.attrib(P,'change')
end
local function at(s,i)
return sub(s,i,i)
end
path.is_windows = utils.is_windows
local sep, other_sep, seps
-- constant sep is the directory separator for this platform.
-- constant dirsep is the separator in the PATH environment variable
if path.is_windows then
path.sep = '\\'; other_sep = '/'
path.dirsep = ';'
seps = { ['/'] = true, ['\\'] = true }
else
path.sep = '/'
path.dirsep = ':'
seps = { ['/'] = true }
end
sep = path.sep
--- are we running Windows?
-- @class field
-- @name path.is_windows
--- path separator for this platform.
-- @class field
-- @name path.sep
--- separator for PATH for this platform
-- @class field
-- @name path.dirsep
--- given a path, return the directory part and a file part.
-- if there's no directory part, the first value will be empty
-- @string P A file path
-- @return directory part
-- @return file part
-- @usage
-- local dir, file = path.splitpath("some/dir/myfile.txt")
-- assert(dir == "some/dir")
-- assert(file == "myfile.txt")
--
-- local dir, file = path.splitpath("some/dir/")
-- assert(dir == "some/dir")
-- assert(file == "")
--
-- local dir, file = path.splitpath("some_dir")
-- assert(dir == "")
-- assert(file == "some_dir")
function path.splitpath(P)
assert_string(1,P)
local i = #P
local ch = at(P,i)
while i > 0 and ch ~= sep and ch ~= other_sep do
i = i - 1
ch = at(P,i)
end
if i == 0 then
return '',P
else
return sub(P,1,i-1), sub(P,i+1)
end
end
--- return an absolute path.
-- @string P A file path
-- @string[opt] pwd optional start path to use (default is current dir)
function path.abspath(P,pwd)
assert_string(1,P)
if pwd then assert_string(2,pwd) end
local use_pwd = pwd ~= nil
if not use_pwd and not currentdir() then return P end
P = P:gsub('[\\/]$','')
pwd = pwd or currentdir()
if not path.isabs(P) then
P = path.join(pwd,P)
elseif path.is_windows and not use_pwd and at(P,2) ~= ':' and at(P,2) ~= '\\' then
P = pwd:sub(1,2)..P -- attach current drive to path like '\\fred.txt'
end
return path.normpath(P)
end
--- given a path, return the root part and the extension part.
-- if there's no extension part, the second value will be empty
-- @string P A file path
-- @treturn string root part (everything upto the "."", maybe empty)
-- @treturn string extension part (including the ".", maybe empty)
-- @usage
-- local file_path, ext = path.splitext("/bonzo/dog_stuff/cat.txt")
-- assert(file_path == "/bonzo/dog_stuff/cat")
-- assert(ext == ".txt")
--
-- local file_path, ext = path.splitext("")
-- assert(file_path == "")
-- assert(ext == "")
function path.splitext(P)
assert_string(1,P)
local i = #P
local ch = at(P,i)
while i > 0 and ch ~= '.' do
if seps[ch] then
return P,''
end
i = i - 1
ch = at(P,i)
end
if i == 0 then
return P,''
else
return sub(P,1,i-1),sub(P,i)
end
end
--- return the directory part of a path
-- @string P A file path
-- @treturn string everything before the last dir-separator
-- @see splitpath
-- @usage
-- path.dirname("/some/path/file.txt") -- "/some/path"
-- path.dirname("file.txt") -- "" (empty string)
function path.dirname(P)
assert_string(1,P)
local p1 = path.splitpath(P)
return p1
end
--- return the file part of a path
-- @string P A file path
-- @treturn string
-- @see splitpath
-- @usage
-- path.basename("/some/path/file.txt") -- "file.txt"
-- path.basename("/some/path/file/") -- "" (empty string)
function path.basename(P)
assert_string(1,P)
local _,p2 = path.splitpath(P)
return p2
end
--- get the extension part of a path.
-- @string P A file path
-- @treturn string
-- @see splitext
-- @usage
-- path.extension("/some/path/file.txt") -- ".txt"
-- path.extension("/some/path/file_txt") -- "" (empty string)
function path.extension(P)
assert_string(1,P)
local _,p2 = path.splitext(P)
return p2
end
--- is this an absolute path?
-- @string P A file path
-- @usage
-- path.isabs("hello/path") -- false
-- path.isabs("/hello/path") -- true
-- -- Windows;
-- path.isabs("hello\path") -- false
-- path.isabs("\hello\path") -- true
-- path.isabs("C:\hello\path") -- true
-- path.isabs("C:hello\path") -- false
function path.isabs(P)
assert_string(1,P)
if path.is_windows and at(P,2) == ":" then
return seps[at(P,3)] ~= nil
end
return seps[at(P,1)] ~= nil
end
--- return the path resulting from combining the individual paths.
-- if the second (or later) path is absolute, we return the last absolute path (joined with any non-absolute paths following).
-- empty elements (except the last) will be ignored.
-- @string p1 A file path
-- @string p2 A file path
-- @string ... more file paths
-- @treturn string the combined path
-- @usage
-- path.join("/first","second","third") -- "/first/second/third"
-- path.join("first","second/third") -- "first/second/third"
-- path.join("/first","/second","third") -- "/second/third"
function path.join(p1,p2,...)
assert_string(1,p1)
assert_string(2,p2)
if select('#',...) > 0 then
local p = path.join(p1,p2)
local args = {...}
for i = 1,#args do
assert_string(i,args[i])
p = path.join(p,args[i])
end
return p
end
if path.isabs(p2) then return p2 end
local endc = at(p1,#p1)
if endc ~= path.sep and endc ~= other_sep and endc ~= "" then
p1 = p1..path.sep
end
return p1..p2
end
--- normalize the case of a pathname. On Unix, this returns the path unchanged,
-- for Windows it converts;
--
-- * the path to lowercase
-- * forward slashes to backward slashes
-- @string P A file path
-- @usage path.normcase("/Some/Path/File.txt")
-- -- Windows: "\some\path\file.txt"
-- -- Others : "/Some/Path/File.txt"
function path.normcase(P)
assert_string(1,P)
if path.is_windows then
return P:gsub('/','\\'):lower()
else
return P
end
end
--- normalize a path name.
-- `A//B`, `A/./B`, and `A/foo/../B` all become `A/B`.
--
-- An empty path results in '.'.
-- @string P a file path
function path.normpath(P)
assert_string(1,P)
-- Split path into anchor and relative path.
local anchor = ''
if path.is_windows then
if P:match '^\\\\' then -- UNC
anchor = '\\\\'
P = P:sub(3)
elseif seps[at(P, 1)] then
anchor = '\\'
P = P:sub(2)
elseif at(P, 2) == ':' then
anchor = P:sub(1, 2)
P = P:sub(3)
if seps[at(P, 1)] then
anchor = anchor..'\\'
P = P:sub(2)
end
end
P = P:gsub('/','\\')
else
-- According to POSIX, in path start '//' and '/' are distinct,
-- but '///+' is equivalent to '/'.
if P:match '^//' and at(P, 3) ~= '/' then
anchor = '//'
P = P:sub(3)
elseif at(P, 1) == '/' then
anchor = '/'
P = P:match '^/*(.*)$'
end
end
local parts = {}
for part in P:gmatch('[^'..sep..']+') do
if part == '..' then
if #parts ~= 0 and parts[#parts] ~= '..' then
remove(parts)
else
append(parts, part)
end
elseif part ~= '.' then
append(parts, part)
end
end
P = anchor..concat(parts, sep)
if P == '' then P = '.' end
return P
end
--- relative path from current directory or optional start point
-- @string P a path
-- @string[opt] start optional start point (default current directory)
function path.relpath (P,start)
assert_string(1,P)
if start then assert_string(2,start) end
local split,min,append = utils.split, math.min, table.insert
P = path.abspath(P,start)
start = start or currentdir()
local compare
if path.is_windows then
P = P:gsub("/","\\")
start = start:gsub("/","\\")
compare = function(v) return v:lower() end
else
compare = function(v) return v end
end
local startl, Pl = split(start,sep), split(P,sep)
local n = min(#startl,#Pl)
if path.is_windows and n > 0 and at(Pl[1],2) == ':' and Pl[1] ~= startl[1] then
return P
end
local k = n+1 -- default value if this loop doesn't bail out!
for i = 1,n do
if compare(startl[i]) ~= compare(Pl[i]) then
k = i
break
end
end
local rell = {}
for i = 1, #startl-k+1 do rell[i] = '..' end
if k <= #Pl then
for i = k,#Pl do append(rell,Pl[i]) end
end
return table.concat(rell,sep)
end
--- Replace a starting '~' with the user's home directory.
-- In windows, if HOME isn't set, then USERPROFILE is used in preference to
-- HOMEDRIVE HOMEPATH. This is guaranteed to be writeable on all versions of Windows.
-- @string P A file path
function path.expanduser(P)
assert_string(1,P)
if at(P,1) == '~' then
local home = getenv('HOME')
if not home then -- has to be Windows
home = getenv 'USERPROFILE' or (getenv 'HOMEDRIVE' .. getenv 'HOMEPATH')
end
return home..sub(P,2)
else
return P
end
end
---Return a suitable full path to a new temporary file name.
-- unlike os.tmpname(), it always gives you a writeable path (uses TEMP environment variable on Windows)
function path.tmpname ()
local res = tmpnam()
-- On Windows if Lua is compiled using MSVC14 os.tmpname
-- already returns an absolute path within TEMP env variable directory,
-- no need to prepend it.
if path.is_windows and not res:find(':') then
res = getenv('TEMP')..res
end
return res
end
--- return the largest common prefix path of two paths.
-- @string path1 a file path
-- @string path2 a file path
-- @return the common prefix (Windows: separators will be normalized, casing will be original)
function path.common_prefix (path1,path2)
assert_string(1,path1)
assert_string(2,path2)
-- get them in order!
if #path1 > #path2 then path2,path1 = path1,path2 end
local compare
if path.is_windows then
path1 = path1:gsub("/", "\\")
path2 = path2:gsub("/", "\\")
compare = function(v) return v:lower() end
else
compare = function(v) return v end
end
for i = 1,#path1 do
if compare(at(path1,i)) ~= compare(at(path2,i)) then
local cp = path1:sub(1,i-1)
if at(path1,i-1) ~= sep then
cp = path.dirname(cp)
end
return cp
end
end
if at(path2,#path1+1) ~= sep then path1 = path.dirname(path1) end
return path1
--return ''
end
--- return the full path where a particular Lua module would be found.
-- Both package.path and package.cpath is searched, so the result may
-- either be a Lua file or a shared library.
-- @string mod name of the module
-- @return on success: path of module, lua or binary
-- @return on error: nil, error string listing paths tried
function path.package_path(mod)
assert_string(1,mod)
local res, err1, err2
res, err1 = package.searchpath(mod,package.path)
if res then return res,true end
res, err2 = package.searchpath(mod,package.cpath)
if res then return res,false end
return raise ('cannot find module on path\n' .. err1 .. "\n" .. err2)
end
---- finis -----
return path
|