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GaudiRelease/doc/manual/code-style.md
Go to the documentation of this file.
1 Code Style Conventions {#code-style}
2 ======================
3
4 Having a common formatting convention throughout the code makes it more easy to
5 follow for every developer.
6
7 Ideally, every source file in %Gaudi should follow the same conventions, but with
8 many contributors and no tool to enforce the conventions, the sources tend to
9 get chaotic. So, in the context of [GAUDI-1176](https://its.cern.ch/jira/browse/GAUDI-1176),
10 we added customized rules for the tool [`clang-format`](http://clang.llvm.org/docs/ClangFormat.html)
11 and helpers to use it.
12
13 For Python code we try to follow the rules described in [PEP-8](https://www.python.org/dev/peps/pep-0008/).
14 The tool [autopep8](https://pypi.python.org/pypi/autopep8) can be used to fix the
15 code, and if available it is used by the same helpers that we provide for `clang-format`.
16
17 To avoid that the rules are not followed, an automatic test is run on the
18 merge requests to verify that they were applied, so developers and contributors
19 are encouraged to apply the format rules to the files they modify.
20
21
22 Formatting the code
23 -------------------
24
25 There are several ways to apply the formating rules via the `clang-format` tool.
26 For example, the [`clang-format` documentation page](http://clang.llvm.org/docs/ClangFormat.html)
27 shows how to integrate its use in popular editors like Vim and Emacs, and IDEs
28 like [Qt Creator](https://www.qt.io/ide/) have plugins to call automatically
29 `clang-format`. In this cases, to format %Gaudi sources, one you specify the
30 style _file_.
31
32 For the cases where integration with an editor or an IDE is not possible, or
33 when the command line is preferred, we added a wrapper script in the build
34 directory (`apply-formatting`) that simplifies the call to `clang-format` and
35 `autopep8`. To use it you need to pass to it the path to the files you want
36 to reformat (only C++ and Python files are taken into account). For example to
37 apply the formatting rules to all files modified between two commits one can do
38 something like:
39
40 cd gaudi_src_dir
41 gaudi_build_dir/apply-formatting $(git diff --name-only origin/master HEAD)
42
43
44 It's also possible to apply the formatting rules to all the files in the project
45 with the special build target `apply-formatting`.