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erlang.mk
=========
Common Makefile rules for building and testing Erlang applications.
Usage
-----
Add the file `erlang.mk` to your project, then use the following base
Makefile:
``` Makefile
PROJECT = my_project
include erlang.mk
```
Dependencies
------------
Erlang projects often depend on other projects to run. Adding dependencies
to the Makefile is easy. You need to create the variable `DEPS` listing
the names of all the dependencies, along with one `dep_$(NAME)` variable
per dependency giving the git repository and commit to retrieve.
These variables should be defined before the include line.
``` Makefile
DEPS = cowboy bullet
dep_cowboy = https://github.com/extend/cowboy.git 0.8.4
dep_bullet = https://github.com/extend/bullet.git 0.4.1
```
They will always be compiled using the command `make`.
You can also specify test-only dependencies. These dependencies will only
be downloaded when running `make tests`. The format is the same as above,
except the variable `TEST_DEPS` holds the list of test-only dependencies.
``` erlang
TEST_DEPS = ct_helper
dep_ct_helper = https://github.com/extend/ct_helper.git master
```
Please note that the test dependencies will only be compiled once
when they are fetched, unlike the normal dependencies.
Compiled files
--------------
The following files will be automatically compiled:
| Wildcard | Description |
| ------------------ | ----------------------------- |
| `src/*.app.src` | OTP application resource file |
| `src/*.erl` | Erlang source files |
| `src/*.core` | Core Erlang source files |
| `templates/*.dtl` | ErlyDTL template files |
Only the `.app.src` file and at least one `.erl` file are required.
Commands
--------
The following targets are defined:
| Targets | Description |
| ------------ | -------------------------------------------- |
| `all` | Compile the application and all dependencies |
| `clean-all` | Clean the application and all dependencies |
| `app` | Compile the application |
| `clean` | Clean the application |
| `deps` | Compile the dependencies |
| `clean-deps` | Clean the dependencies |
| `docs` | Generate the Edoc documentation |
| `clean-docs` | Clean the Edoc documentation |
| `tests` | Run the common_test suites |
| `build-plt` | Generate the PLT needed by Dialyzer |
| `dialyze` | Run Dialyzer on the application |
Cleaning means removing all generated and temporary files.
Dependencies are fetched as soon as a command involving them is
invoked. This means that most of the targets will trigger a
dependency fetch. It is only done once per dependency.
The default target when calling `make` is `all`.
You can combine targets to perform many operations. For example, the
shell command `make clean app` will have the effect of recompiling
the application fully, without touching the dependencies.
A common workflow when editing a file would be to run `make` regularly
to see if it compiles (or less often `make clean app` if you want to
recompile everything), followed by `make dialyze` to see if there are
any type errors and then `make tests` to run the test suites. The
result of the test runs can be browsed from the `logs/index.html` file.
Options
-------
The following variables can be overriden:
`V` defines the verbosity of the commands. You can set it
to an empty value to make commands verbose.
`ERLC_OPTS` allows you to change the `erlc` compilation
options. You should always compile with at least the `+debug_info` set.
`COMPILE_FIRST` is a list of modules (not filenames) that should be
compiled before all others.
`DEPS_DIR` is the path to the directory where the dependencies are
downloaded to. It defaults to `deps`. It will be propagated into
all the subsequent make calls, allowing all dependencies to use
the same folder as expected.
`CT_SUITES` is the list of common_test suites to run when you use
the `make tests` command. If your suite module is named `ponies_SUITE`
then you only need to put `ponies` in the list.
`PLT_APPS` is the list of applications to include when building the
`.plt` file for Dialyzer. You do not need to put `erts`, `kernel` or
`stdlib` in there because they will always be included. The applications
the project depends on will also be included.
`DIALYZER_OPTS` allows you to change the `dialyzer` options.
Extra targets
-------------
If you need more functionality out of your Makefile, you can add extra
targets after the include line.
Defining a target before the include line will override the default
target `all`.
Support
-------
* Official IRC Channel: #ninenines on irc.freenode.net
* [Mailing Lists](http://lists.ninenines.eu)
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