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("lfs")
  30
  31 -- Returns the content of file
  32 function readfile(filename)
  33         local fp = io.open(filename)
  34         if fp == nil then
  35                 error("Unable to open file for reading: " .. filename)
  36         end
  37         local data = fp:read("*a")
  38         fp:close()
  39         return data
  40 end
  41
  42 -- Writes given data to a file
  43 function writefile(filename, data)
  44         local fp = io.open(filename, "w")
  45         if fp == nil then
  46                 error("Unable to open file for writing: " .. filename)
  47         end
  48         fp:write(data)
  49         fp:close()
  50 end
  51
  52 -- Returns the file modification date/time of "path"
  53 function mtime(path)
  54         return lfs.attributes(path, "modification")
  55 end
  56
  57 -- Simplified dirname function
  58 function dirname(file)
  59         return string.gsub(file, "[^/]+$", "")
  60 end
  61
  62 -- Diriterator - alias for lfs.dir - filter . and ..
  63 function dir(path)
  64         local e = {}
  65         for entry in lfs.dir(path) do
  66                 if not(entry == "." or entry == "..") then
  67                         table.insert(e, entry)
  68                 end
  69         end
  70         return e
  71 end