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## Overview
LuaCov is a simple coverage analyzer for [Lua](http://www.lua.org) scripts.
When a Lua script is run with the `luacov` module loaded, it generates a stats
file with the number of executions of each line of the script and its loaded
modules. The `luacov` command-line script then processes this file generating
a report file which allows one to visualize which code paths were not
traversed, which is useful for verifying the effectiveness of a test suite.
LuaCov is free software and, like Lua, is released under the [MIT
License](http://www.lua.org/license.html).
## Download and Installation
LuaCov can be downloaded from its [Github downloads
page](https://github.com/keplerproject/luacov/releases).
It can also be installed using Luarocks:
luarocks install luacov
LuaCov is written in pure Lua and has no external dependencies.
## Instructions
Using LuaCov consists of two steps: running your script to collect coverage
data, and then running `luacov` on the collected data to generate a report
(see _configuration_ below for other options).
To collect coverage data, your script needs to load the `luacov` Lua module.
This can be done from the command-line, without modifying your script, like
this:
lua -lluacov test.lua
Alternatively, you can add `require("luacov")` to the first line of your
script.
Once the script is run, a file called `luacov.stats.out` is generated. If the
file already exists, statistics are _added_ to it. This is useful, for
example, for making a series of runs with different input parameters in a test
suite. To start the accounting from scratch, just delete the stats file.
To generate a report, just run the `luacov` command-line script. It expects to
find a file named `luacov.stats.out` in the current directory, and outputs a
file named `luacov.report.out`. The script take the following parameters;
luacov [-c=configfile] [filename [ filename[ ...]]]
For the `-c` option see below at _configuration_. The filenames (actually
patterns) indicate the files to include in the report, specifying them here
equals to adding them to the `include` list in the configuration file.
This is an example output of the report file:
============================================================
../test.lua
============================================================
-- Which branch will run?
1 if 10 > 100 then
0 print("I don't think this line will execute.")
0 else
1 print("Hello, LuaCov!")
1 end
Note that to generate this report, `luacov` reads the source files. Therefore,
it expects to find them in the same location they were when the `luacov`
module ran (the stats file stores the filenames, but not the sources
themselves).
LuaCov saves its stats upon normal program termination. If your program is a
daemon -- in other words, if it does not terminate normally -- you can use the
`luacov.tick` module, which periodically saves the stats file. For example, to
run (on Unix systems) LuaCov on
[Xavante](http://www.keplerproject.org/xavante), just modify the first line of
`xavante_start.lua` so it reads:
#!/usr/bin/env lua -lluacov.tick
## Configuration
LuaCov includes several configuration options, which have their defaults
stored in `/luacov/defaults.lua`. These are the global defaults. To create
project specific defaults, copy the file and store it as `.luacov` in the
project directory from where `luacov` is being run.
Options include changing filenames, automatic report generation upon
completion and removal of the stats after generating the report.
## Credits
LuaCov was designed and implemented by Hisham Muhammad as a tool for testing
[Luarocks](http://www.luarocks.org).
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