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--[[
module for generic filesystem funcs
Copyright (c) Natanael Copa 2006
MM edited to use "posix"
]]--
module (..., package.seeall)
require("posix")
require("format")
-- generic wrapper funcs
function is_dir ( pathstr )
return posix.stat ( pathstr or "", "type" ) == "directory"
end
function is_file ( pathstr )
return posix.stat ( pathstr or "", "type" ) == "regular"
end
function is_link ( pathstr )
return posix.stat ( pathstr or "", "type" ) == "link"
end
-- Creates a directory if it doesn't exist, including the parent dirs
function create_directory ( path )
local pos = string.find(path, "/")
while pos do
posix.mkdir(string.sub(path, 1, pos))
pos = string.find(path, "/", pos+1)
end
posix.mkdir(path)
return is_dir(path)
end
-- Deletes a directory along with its contents
function remove_directory ( path )
if fs.is_dir(path) then
for d in posix.files(path) do
if (d == ".") or (d == "..") then
-- ignore
elseif fs.is_dir(path .. "/" .. d) then
remove_directory(path .. "/" ..d)
else
os.remove(path .. "/" ..d)
end
end
os.remove(path)
return true
end
return false
end
-- Creates a blank file (and the directory if necessary)
function create_file ( path )
path = path or ""
if not posix.stat(posix.dirname(path)) then create_directory(posix.dirname(path)) end
local f = io.open(path, "w")
if f then f:close() end
return is_file(path)
end
-- Copies the permissions and ownership of one file to another (if they exist and are the same type)
function copy_properties(source, dest)
if posix.stat(source or "", "type") == posix.stat(dest or "", "type") then
local stats = posix.stat(source)
posix.chmod(dest, stats.mode)
posix.chown(dest, stats.uid, stats.gid)
return true
end
return false
end
-- Copies a file to a directory or new filename (creating the directory if necessary)
-- fails if new file is already a directory (this is different than cp function)
-- if newpath ends in "/", will treat as a directory
function copy_file(oldpath, newpath)
local use_dir = string.find(newpath or "", "/%s*$")
if not is_file(oldpath) or not newpath or newpath == "" or (not use_dir and is_dir(newpath)) or (use_dir and is_dir(newpath .. posix.basename(oldpath))) then
return false
end
if use_dir then newpath = newpath .. posix.basename(oldpath) end
if not posix.stat(posix.dirname(newpath)) then create_directory(posix.dirname(newpath)) end
local old = io.open(oldpath, "r")
local new = io.open(newpath, "w")
new:write(old:read("*a"))
new:close()
old:close()
copy_properties(oldpath, newpath)
return is_file(newpath)
end
-- Moves a file to a directory or new filename (creating the directory if necessary)
-- fails if new file is already a directory (this is different than mv function)
-- if newpath ends in "/", will treat as a directory
function move_file(oldpath, newpath)
local use_dir = string.find(newpath or "", "/%s*$")
if not is_file(oldpath) or not newpath or newpath == "" or (not use_dir and is_dir(newpath)) or (use_dir and is_dir(newpath .. posix.basename(oldpath))) then
return false
end
if use_dir then newpath = newpath .. posix.basename(oldpath) end
if not posix.stat(posix.dirname(newpath)) then create_directory(posix.dirname(newpath)) end
local status, errstr, errno = os.rename(oldpath, newpath)
-- errno 18 means Invalid cross-device link
if status or errno ~= 18 then
-- successful move or failure due to something else
return (status ~= nil), errstr, errno
else
status = copy_file(oldpath, newpath)
if status then
os.remove(oldpath)
end
return status
end
end
-- Returns the contents of a file as a string
function read_file ( path )
local file = io.open(path or "")
if ( file ) then
local f = file:read("*a")
file:close()
return f
else
return nil
end
end
-- Returns an array with the contents of a file,
-- or nil and the error message
function read_file_as_array ( path )
local file, error = io.open(path or "")
if ( file == nil ) then
return nil, error
end
local f = {}
for line in file:lines() do
table.insert ( f , line )
--sometimes you will see it like f[#f+1] = line
end
file:close()
return f
end
-- write a string to a file, will replace file contents
function write_file ( path, str )
path = path or ""
if not posix.stat(posix.dirname(path)) then create_directory(posix.dirname(path)) end
local file = io.open(path, "w")
--append a newline char to EOF
str = string.gsub(str or "", "\n*$", "\n")
if ( file ) then
file:write(str)
file:close()
end
end
-- this could do more than a line. This will append
-- fs.write_line_file ("filename", "Line1 \nLines2 \nLines3")
function write_line_file ( path, str )
path = path or ""
if not posix.stat(posix.dirname(path)) then create_directory(posix.dirname(path)) end
local file = io.open(path)
if ( file) then
local c = file:read("*a") or ""
file:close()
fs.write_file(path, c .. (str or ""))
end
end
-- returns an array of files under "where" that match "what" (a Lua pattern)
function find_files_as_array ( what, where, follow, t )
where = where or posix.getcwd()
what = what or ".*"
t = t or {}
local link
if follow and fs.is_link(where) then
link = posix.readlink(where)
if not string.find(link, "^/") then
link = posix.dirname(where).."/"..link
end
end
if fs.is_dir(where) or (link and fs.is_dir(link)) then
for d in posix.files ( where ) do
if (d == ".") or ( d == "..") then
-- do nothing
elseif fs.is_dir ( where .. "/" .. d ) then
find_files_as_array (what, where .. "/" .. d, follow, t )
elseif follow and fs.is_link ( where .. "/" .. d ) then
find_files_as_array (what, where .. "/" .. d, follow, t )
elseif (string.match (d, "^" .. what .. "$" )) then
table.insert (t, ( string.gsub ( where .. "/" .. d, "/+", "/" ) ) )
end
end
elseif (string.match (posix.basename(where), "^" .. what .. "$" )) and posix.stat(where) then
table.insert (t, where )
end
return (t)
end
-- iterator function for finding dir entries matching (what) (a Lua pattern)
-- starting at where, or currentdir if not specified.
function find ( what, where, follow )
local t = find_files_as_array ( what, where, follow )
local idx = 0
return function ()
idx = idx + 1
return t[idx]
end
end
-- This function does almost the same as posix.stat, but instead it writes the output human readable.
function stat ( path )
local filedetails = posix.stat(path or "")
if (filedetails) then
filedetails["ctime"]=os.date("%c", filedetails["ctime"])
filedetails["mtime"]=os.date("%c", filedetails["mtime"])
filedetails["path"]=path
if ( filedetails["size"] > 1073741824 ) then
filedetails["size"]=((filedetails["size"]/1073741824) - (filedetails["size"]/1073741824%0.1)) .. "G"
elseif ( filedetails["size"] > 1048576 ) then
filedetails["size"]=((filedetails["size"]/1048576) - (filedetails["size"]/1048576%0.1)) .. "M"
elseif ( filedetails["size"] > 1024 ) then
filedetails["size"]=((filedetails["size"]/1024) - (filedetails["size"]/1024%0.1)) .. "k"
else
filedetails["size"]=filedetails["size"]
end
end
return filedetails
end
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