erlang.mk ========= Common Makefile rules for building and testing Erlang applications. Also features support for dependencies and a package index. Requirements ------------ `erlang.mk` requires GNU Make and expects to be ran in a standard unix environment with Erlang installed and in the `$PATH`. `erlang.mk` uses `wget` for downloading the package index file when the `pkg://` scheme is used. Usage ----- Add the file `erlang.mk` to your project, then use the following base Makefile: ``` Makefile PROJECT = my_project include erlang.mk ``` Dependencies ------------ Erlang projects often depend on other projects to run. Adding dependencies to the Makefile is easy. You need to create the variable `DEPS` listing the names of all the dependencies, along with one `dep_$(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`. If the dependency does not feature a Makefile, then erlang.mk will be used for building. 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. Package index ------------- A very basic package index is included with erlang.mk. You can list all known packages with the `make pkg-list` command. You can search a package with the `make pkg-search q=STRING` command, replacing `STRING` with what you want to search. Use quotes around the string if needed. In addition, it is possible to specify dependencies in a simplified manner if they exist in the package index. The above example could instead read as: ``` Makefile DEPS = cowboy bullet dep_cowboy = pkg://cowboy 0.8.4 dep_bullet = pkg://bullet 0.4.1 ``` erlang.mk will look inside the index for the proper URL and use it for fetching the dependency. All packages featured in the index are compatible with erlang.mk with no extra work required. Releases -------- If a `relx.config` file is present, erlang.mk will download `relx` automatically and build the release into the `_rel` folder. This is the default command when the file exists. No special configuration is required for this to work. Compiled files -------------- The following files will be automatically compiled: | Wildcard | Description | | ------------------------ | ----------------------------- | | `src/$(PROJECT).app.src` | OTP application resource file | | `src/*.erl` | Erlang source files | | `src/*.core` | Core Erlang source files | | `src/*.xrl` | Leex source files | | `src/*.yrl` | Yecc 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 | | `test_*` | Run the common_test suite `*` | | `tests` | Run all the common_test suites | | `build-plt` | Generate the PLT needed by Dialyzer | | `dialyze` | Run Dialyzer on the application | | `pkg-list` | List packages in the index | | `pkg-search` | Search for packages in the index | | `rel` | Build a release | | `clean-rel` | Delete the previously built release | 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. You can run an individual test suite by using the special `test_*` targets. For example if you have a common_test suite named `spdy` and you want to run only this suite and not the others, you can use the `make test_spdy` command. The default target when calling `make` is `all` when no `relx.config` exists, and `rel` when it does exist. 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. `EDOC_OPTS` allows you to specify [options](http://www.erlang.org/doc/man/edoc.html#run-3) to pass to `edoc` when building the documentation. Notice: not all options are documented in one place; follow the links to get to the options for the various operations of the documentation generation. `TEST_ERLC_OPTS` allows you to change the `erlc` compilation options that are used for building the project for testing, but also the tests themselves. Unlike `ERLC_OPTS` it doesn't consider warnings to be errors and does not warn when `export_all` is used. `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. `CT_OPTS` allows you to specify extra common_test options. `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_PLT` allows you to change the PLT file used by dialyzer. `DIALYZER_OPTS` allows you to change the `dialyzer` options. `PKG_FILE` allows you to change the location of the package index file on your system. `PKG_FILE_URL` allows you to change the URL from which the package index file is fetched. `RELX_CONFIG` is the location of the `relx.config` file, if any. `RELX` is the location of the `relx` executable for building releases. `RELX_URL` is the location where `relx` can be downloaded if it is not found locally. `RELX_OPTS` is for setting relx in-line options, if any. 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)