src/ffluci/fs.lua

   1 --[[
   2 FFLuCI - Filesystem tools
   3
   4 Description:
   5 A module offering often needed filesystem manipulation functions
   6
   7 FileId:
   8 $Id$
   9
  10 License:
  11 Copyright 2008 Steven Barth <steven@midlink.org>
  12
  13 Licensed under the Apache License, Version 2.0 (the "License");
  14 you may not use this file except in compliance with the License.
  15 You may obtain a copy of the License at
  16
  17         http://www.apache.org/licenses/LICENSE-2.0
  18
  19 Unless required by applicable law or agreed to in writing, software
  20 distributed under the License is distributed on an "AS IS" BASIS,
  21 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  22 See the License for the specific language governing permissions and
  23 limitations under the License.
  24
  25 ]]--
  26
  27 module("ffluci.fs", package.seeall)
  28
  29 require("posix")
  30
  31 -- Checks whether a file exists
  32 function isfile(filename)
  33         local fp = io.open(path, "r")
  34         if file then file:close() end
  35         return file ~= nil
  36 end
  37
  38 -- Returns the content of file
  39 function readfile(filename)
  40         local fp, err = io.open(filename)
  41
  42         if fp == nil then
  43                 return nil, err
  44         end
  45
  46         local data = fp:read("*a")
  47         fp:close()
  48         return data
  49 end
  50
  51 -- Returns the content of file as array of lines
  52 function readfilel(filename)
  53         local fp, err = io.open(filename)
  54         local line = ""
  55         local data = {}
  56
  57         if fp == nil then
  58                 return nil, err
  59         end
  60
  61         while true do
  62                 line = fp:read()
  63                 if (line == nil) then break end
  64                 table.insert(data, line)
  65         end
  66
  67         fp:close()
  68         return data
  69 end
  70
  71 -- Writes given data to a file
  72 function writefile(filename, data)
  73         local fp, err = io.open(filename, "w")
  74
  75         if fp == nil then
  76                 return nil, err
  77         end
  78
  79         fp:write(data)
  80         fp:close()
  81
  82         return true
  83 end
  84
  85 -- Returns the file modification date/time of "path"
  86 function mtime(path)
  87         return posix.stat(path, "mtime")
  88 end
  89
  90 -- basename wrapper
  91 basename = posix.basename
  92
  93 -- dirname wrapper
  94 dirname = posix.dirname
  95
  96 -- dir wrapper
  97 function dir(path)
  98         local dir = {}
  99         for node in posix.files(path) do
 100                 table.insert(dir, 1, node)
 101         end
 102         return dir
 103 end
 104
 105 -- Alias for lfs.mkdir
 106 mkdir = posix.mkdir