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
  35         if fp == nil then
  36                 error("Unable to open file for reading: " .. filename)
  37         end
  38
  39         local data = fp:read("*a")
  40         fp:close()
  41         return data
  42 end
  43
  44 -- Returns the content of file as array of lines
  45 function readfilel(filename)
  46         local fp = io.open(filename)
  47         local line = ""
  48         local data = {}
  49
  50         if fp == nil then
  51                 error("Unable to open file for reading: " .. filename)
  52         end
  53
  54         while true do
  55                 line = fp:read()
  56                 if (line == nil) then break end
  57                 table.insert(data, line)
  58         end
  59
  60         fp:close()
  61         return data
  62 end
  63
  64 -- Writes given data to a file
  65 function writefile(filename, data)
  66         local fp = io.open(filename, "w")
  67         if fp == nil then
  68                 error("Unable to open file for writing: " .. filename)
  69         end
  70         fp:write(data)
  71         fp:close()
  72 end
  73
  74 -- Returns the file modification date/time of "path"
  75 function mtime(path)
  76         return lfs.attributes(path, "modification")
  77 end
  78
  79 -- Simplified dirname function
  80 function dirname(file)
  81         return string.gsub(file, "[^/]+$", "")
  82 end
  83
  84 -- Diriterator - alias for lfs.dir - filter . and ..
  85 function dir(path)
  86         local e = {}
  87         for entry in lfs.dir(path) do
  88                 if not(entry == "." or entry == "..") then
  89                         table.insert(e, entry)
  90                 end
  91         end
  92         return e
  93 end