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RRDLua is a Lua module for RRD functions.
- Configuration
From the top dir of RRDtool package, run "./configure", or
"./configure --enable-lua-site-install" if you prefer to install in
Lua's search path.
You should have lua 5.0, or superior, and respective lua-dev packages
installed before executing configure.
- Compilation and installation
Run 'make' and 'sudo make install'. If you don't enable lua-site-install,
the Lua modules will be installed together with RRDtool, under the subdir
<INSTALL_PREFIX>lib/lua/<lua_version>.
- Testing
Install RRDtool first, as above. Then, enter the bindings/lua dir, run
'make test' and use your preferred viewer to display the just created
'test.png'. If you can read "Enjoy Lua RRDtool module!" on the picture,
everything went fine.
- Using with Lua 5.1
Start your programs with:
------..-----------------------------------------------------------
package.cpath = '<INSTALL_PREFIX/lib/lua/5.1/?.so;' ..
package.cpath
require 'rrd'
-------------------------------------------------------------------
OBS: If you use the option --enable-lua-site-install you won't need
to change package.cpath like above.
- Using with Lua 5.0
The Lua binding for RRDtool needs the compat-5.1 module to work with
Lua 5.0. Some Linux distros, like Ubuntu gutsy and hardy, have it
already integrated in Lua 5.0 -dev packages, so you just have to
require:
require 'compat-5.1'
For other platforms, the compat-5.1 module that comes with this Lua
binding will be installed for you in the same dir where RRDtool was
installed, under the subdir .../lib/lua/5.0. In this case, you must
tell your Lua programs where to find it by changing the Lua var
LUA_PATH:
--- compat-5.1.lua is only necessary for Lua 5.0 ------------------
original_LUA_PATH = LUA_PATH
-- try only compat-5.1 installed with RRDtool package
LUA_PATH = '<INSTALL_PREFIX>/lib/lua/5.0/?.lua'
require 'compat-5.1'
LUA_PATH = original_LUA_PATH
original_LUA_PATH = nil
--- end of code to require compat-5.1 -----------------------------
Now we can require the rrd module just like we did for 5.1 above:
-------------------------------------------------------------------
package.cpath = '<INSTALL_PREFIX>/lib/lua/5.0/?.so;' ..
package.cpath
require 'rrd'
-------------------------------------------------------------------
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