2 FFLuCI - Utility library
5 Several common useful Lua functions
11 Copyright 2008 Steven Barth <steven@midlink.org>
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
17 http://www.apache.org/licenses/LICENSE-2.0
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.
27 module("ffluci.util", package.seeall)
30 -- Lua simplified Python-style OO class support emulation
34 local create = function(class, ...)
36 setmetatable(inst, {__index = class})
45 local classmeta = {__call = create}
48 classmeta.__index = base
51 setmetatable(class, classmeta)
56 -- Checks whether a table has an object "value" in it
57 function contains(table, value)
58 for k,v in pairs(table) do
67 -- Dumps a table to stdout (useful for testing and debugging)
68 function dumptable(t, i)
70 for k,v in pairs(t) do
71 print(string.rep("\t", i) .. k, v)
72 if type(v) == "table" then
79 -- Escapes all occurences of c in s
82 return s:gsub(c, "\\" .. c)
86 -- Runs "command" and returns its output
87 function exec(command)
88 local pp = io.popen(command)
89 local data = pp:read("*a")
95 -- Runs "command" and returns its output as a array of lines
96 function execl(command)
97 local pp = io.popen(command)
103 if (line == nil) then break end
104 table.insert(data, line)
111 -- Populate obj in the scope of f as key
112 function extfenv(f, key, obj)
113 local scope = getfenv(f)
119 -- Updates the scope of f with "extscope"
120 function updfenv(f, extscope)
121 local scope = getfenv(f)
122 for k, v in pairs(extscope) do
128 -- Returns the filename of the calling script
130 return debug.getinfo(2, 'S').source:sub(2)