core/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 -- Glob
  32 function glob(pattern)
  33         return posix.glob(pattern)
  34 end
  35
  36 -- Checks whether a file exists
  37 function isfile(filename)
  38         local fp = io.open(path, "r")
  39         if file then file:close() end
  40         return file ~= nil
  41 end
  42
  43 -- Returns the content of file
  44 function readfile(filename)
  45         local fp, err = io.open(filename)
  46
  47         if fp == nil then
  48                 return nil, err
  49         end
  50
  51         local data = fp:read("*a")
  52         fp:close()
  53         return data
  54 end
  55
  56 -- Returns the content of file as array of lines
  57 function readfilel(filename)
  58         local fp, err = io.open(filename)
  59         local line = ""
  60         local data = {}
  61
  62         if fp == nil then
  63                 return nil, err
  64         end
  65
  66         while true do
  67                 line = fp:read()
  68                 if (line == nil) then break end
  69                 table.insert(data, line)
  70         end
  71
  72         fp:close()
  73         return data
  74 end
  75
  76 -- Writes given data to a file
  77 function writefile(filename, data)
  78         local fp, err = io.open(filename, "w")
  79
  80         if fp == nil then
  81                 return nil, err
  82         end
  83
  84         fp:write(data)
  85         fp:close()
  86
  87         return true
  88 end
  89
  90 -- Returns the file modification date/time of "path"
  91 function mtime(path)
  92         return posix.stat(path, "mtime")
  93 end
  94
  95 -- basename wrapper
  96 basename = posix.basename
  97
  98 -- dirname wrapper
  99 dirname = posix.dirname
 100
 101 -- dir wrapper
 102 function dir(path)
 103         local dir = {}
 104         for node in posix.files(path) do
 105                 table.insert(dir, 1, node)
 106         end
 107         return dir
 108 end
 109
 110 -- Alias for lfs.mkdir
 111 mkdir = posix.mkdir