fdea1b51ec0d6b20933fca08e016de8e7bec6b74
[project/luci.git] / 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 -- 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 error(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 error(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 if fp == nil then
75 error(err)
76 end
77 fp:write(data)
78 fp:close()
79 end
80
81 -- Returns the file modification date/time of "path"
82 function mtime(path)
83 return lfs.attributes(path, "modification")
84 end
85
86 -- Simplified dirname function
87 function dirname(file)
88 return string.gsub(file, "[^/]+$", "")
89 end
90
91 -- Diriterator - alias for lfs.dir - filter . and ..
92 function dir(path)
93 local e = {}
94 for entry in lfs.dir(path) do
95 if not(entry == "." or entry == "..") then
96 table.insert(e, entry)
97 end
98 end
99 return e
100 end
101
102 -- Alias for lfs.mkdir
103 function mkdir(...)
104 return lfs.mkdir(...)
105 end