17616d1078
The introduction of setup_env as a global concept caused the rebar_port_compiler implementation to start getting called a LOT. The expansion of environment variables that happens in the port compiler was O(n^n), which means you could see upwards of 80k invocations of lists:foldl on a single app "./rebar clean". This commit reworks the expansion to be O(n^2), and reduces the running time for the same operation by 60%+. On a large project like Riak, the end result is that a build went from 200 seconds to 73. |
||
|---|---|---|
| ebin | ||
| include | ||
| inttest | ||
| priv | ||
| src | ||
| test | ||
| .gitignore | ||
| .hgignore | ||
| .hgtags | ||
| bootstrap | ||
| bootstrap.bat | ||
| LICENSE | ||
| Makefile | ||
| NOTES.org | ||
| README.md | ||
| rebar.bat | ||
| rebar.config | ||
| rebar.config.sample | ||
| THANKS | ||
rebar
rebar is an Erlang build tool that makes it easy to compile and
test Erlang applications, port drivers and releases.
rebar is a self-contained Erlang script, so it's easy to distribute or even
embed directly in a project. Where possible, rebar uses standard Erlang/OTP
conventions for project structures, thus minimizing the amount of build
configuration work. rebar also provides dependency management, enabling
application writers to easily re-use common libraries from a variety of
locations (git, hg, etc).
Building
Information on building and installing Erlang/OTP can be found
in the INSTALL.md document.
Dependencies
To build rebar you will need a working installation of Erlang R13B03 (or later).
Should you want to clone the rebar repository, you will also require git.
Downloading
Clone the git repository:
$ git clone git://github.com/basho/rebar.git
Building rebar
$ cd rebar
$ ./bootstrap
Recompile: src/getopt
...
Recompile: src/rebar_utils
==> rebar (compile)
Congratulations! You now have a self-contained script called "rebar" in
your current working directory. Place this script anywhere in your path
and you can use rebar to build OTP-compliant apps.
Contributing to rebar
Pull requests and branching
Use one topic branch per pull request.
Do not commit to master in your fork.
Provide a clean branch without any merge commits from upstream.
Usually you should squash any intermediate commits into the original single commit.
Code style
Do not introduce trailing whitespace.
Do not mix spaces and tabs.
Do not introduce lines longer than 80 characters.
erlang-mode (emacs) indentation is preferred. vi-only users are encouraged to give Vim emulation (more info) a try.
Writing Commit Messages
Structure your commit message like this:
One line summary (less than 50 characters) Longer description (wrap at 72 characters)
Summary
- Less than 50 characters
- What was changed
- Imperative present tense (fix, add, change)
Fix bug 123Add 'foobar' commandChange default timeout to 123
- No period
Description
- Wrap at 72 characters
- Why, explain intention and implementation approach
- Present tense
Atomicity
- Break up logical changes
- Make whitespace changes separately
Dialyzer and Tidier
Before you submit a patch check for discrepancies with Dialyzer:
$ make check
The following discrepancies are known and safe to ignore:
rebar_utils.erl:147: Call to missing or unexported function escript:foldl/3
It is strongly recommended to check the code with
Tidier.
Select all transformation options and enable automatic
transformation.
If Tidier suggests a transformation apply the changes manually
to the source code.
Do not use the code from the tarball (out.tgz) as it will have
white-space changes
applied by Erlang's pretty-printer.