mirror of https://github.com/octoleo/lsyncd.git
63 lines
1.1 KiB
Lua
63 lines
1.1 KiB
Lua
--
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-- lock.lua from Lsyncd -- the Live (Mirror) Syncing Demon
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--
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--
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-- Locks globals.
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--
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-- No more globals can be created after this!
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--
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--
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-- License: GPLv2 (see COPYING) or any later version
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-- Authors: Axel Kittenberger <axkibe@gmail.com>
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--
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if lsyncd_version
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then
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print( 'Error, Lsyncd mantle already loaded' )
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os.exit( -1 )
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end
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local t = _G
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local mt = getmetatable( t ) or { }
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-- TODO try to remove the underscore exceptions
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mt.__index = function
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(
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t, -- table being accessed
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k -- key used to access
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)
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if k ~= '_' and string.sub( k, 1, 2 ) ~= '__'
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then
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error( 'Access of non-existing global "' .. k ..'"', 2 )
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else
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rawget( t, k )
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end
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end
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mt.__newindex = function
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(
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t, -- table getting a new index assigned
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k, -- key value to assign to
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v -- value to assign
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)
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if k ~= '_' and string.sub( k, 1, 2 ) ~= '__'
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then
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error(
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'Lsyncd does not allow GLOBALS to be created on the fly. '
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.. 'Declare "' .. k.. '" local or declare global on load.',
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2
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)
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else
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rawset( t, k, v )
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end
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end
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function lockGlobals( )
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setmetatable( t, mt )
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end
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