Tlua is a task runner for Lua that simplifies running and reusing small bits of useful code. It lets you very easily build a command-line interface for running scripts in a project.
It is in some ways conceptually similar to Rake, but is oriented exclusively towards task running rather replacing Makefiles, and doesn't require a special file format or DSL - it's just plain Lua.
Use TLua to run project tasks such as:
- Invoking tests
- Archiving files for a rock
- Generating Luadocs
- Populating a database with sample data
- etc.
Tlua looks for functions in a file named LuaTasks.lua in your current
directory, and also in a directory named .tlua in your home directory. The
files in ~/.tlua can be in any heirachy and have any name, as long as they
have the extension .lua.
Here's an example LuaTasks.lua file:
--- A "hello world" function for tlua.
-- Looks for a greeting in params[1], or defaults to "hello".
-- Looks for a person in params.to, or defaults to "world".
-- Example: tlua say olá to:João
local function sample_func()
local params = tlua.get_params()
local greeting = params[1] or "hello"
local who = params.to or "world"
print(string.format("%s %s!", greeting, who))
end
tlua.task("say", "Say a greeting", sample_func)
You can then invoke this task on the command line:
$ tlua say hello to:John
hello John!
Any function can be used as a task, as long as it does not require arguments. If you want to make a function that requires arguments into task, you can simply wrap it in a Tlua task that parses the parameters in the apropriate way:
local function test_match()
local params = tlua.get_params()
print(string.match(params[1], params[2]))
end
tlua.task("string.match", "Print the result of string.match", test_match)
Then, invoke the example:
$ tlua string.match '[email protected]' '.*@(.*)'
example.com
You can also set a default task:
tlua.default_task = "my.new.default.task"
Now when you invoke tlua with no arguments, your default task will be run
rather than the help task.
To see what tasks you have available, use tlua list:
$ tlua list
System tasks:
-------------
help Show this message
list List all tasks
User tasks:
-----------
clean Clean up project directory
docs Run Luadoc for the Tlua project
test Run tests
By adding tasks to files in your ~/.tlua directory, you can save useful code snippets from the Lua Users Wiki. This makes tlua sort of like Luarocks, but for functions rather than applications:
require 'tlua'
local split = tlua.get_task("ricci.lakes.split")
Install via Luarocks, or download and copy to the location you desire. At the moment, the best way to install via Luarocks is:
sudo luarocks build http://github.com/norman/tlua/raw/master/tlua-scm-1.rockspec
Norman Clarke - [email protected]
Copyright (c) 2010 Norman Clarke
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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