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-Hacking on `bfs`
-================
-
-License
--------
-
-`bfs` is licensed under the [Zero-Clause BSD License](https://opensource.org/licenses/0BSD), a maximally permissive license.
-Contributions must use the same license.
-
-
-Implementation
---------------
-
-`bfs` is written in [C](https://en.wikipedia.org/wiki/C_(programming_language)), specifically [C11](https://en.wikipedia.org/wiki/C11_(C_standard_revision)).
-You can get a feel for the coding style by skimming the source code.
-[`main.c`](/src/main.c) contains an overview of the rest of source files.
-A quick summary:
-
-- Tabs for indentation, spaces for alignment.
-- Most types and functions should be namespaced with `bfs_`.
-  Exceptions are made for things that could be generally useful outside of `bfs`.
-- Error handling follows the C standard library conventions: return a nonzero `int` or a `NULL` pointer, with the error code in `errno`.
-  All failure cases should be handled, including `malloc()` failures.
-- `goto` is not considered harmful for cleaning up in error paths.
-
-
-Tests
------
-
-`bfs` includes an extensive test suite.
-See the [build documentation](BUILDING.md#testing) for details on running the tests.
-
-Test cases are grouped by the standard or `find` implementation that supports the tested feature(s):
-
-| Group                           | Description                           |
-|---------------------------------|---------------------------------------|
-| [`tests/posix`](/tests/posix)   | POSIX compatibility tests             |
-| [`tests/bsd`](/tests/bsd)       | BSD `find` features                   |
-| [`tests/gnu`](/tests/gnu)       | GNU `find` features                   |
-| [`tests/common`](/tests/common) | Features common to BSD and GNU `find` |
-| [`tests/bfs`](/tests/bfs)       | `bfs`-specific tests                  |
-
-Both new features and bug fixes should have associated tests.
-To add a test, create a new `*.sh` file in the appropriate group.
-Snapshot tests use the `bfs_diff` function to automatically compare the generated and expected outputs.
-For example,
-
-```bash
-# posix/something.sh
-bfs_diff basic -name something
-```
-
-`basic` is one of the directory trees generated for test cases; others include `links`, `loops`, `deep`, and `rainbow`.
-
-Run `./tests/tests.sh posix/something --update` to generate the reference snapshot (and don't forget to `git add` it).