[cfe-dev] Clang-format configuration files

Kim Gräsman kim.grasman at gmail.com
Mon May 6 13:27:04 PDT 2013

Hi Alexander,

When I did external config for IWYU, I added an #include mechanism to allow
configurations composed from different files. In our case it was  to
support per-library configurations, which is probably not useful for
clang-format. However, it might be nice for you to allow "use the Google
style, but..." in the form of a base file and local overrides. E.g.

  # start from Google style
  BasedOn: google.clang-format

  # local adjustments
  ColumnLimit: 120

- Kim

On Monday, May 6, 2013, Alexander Kornienko wrote:

> It's time for clang-format to support more flexible style configuration.
> We're starting to work on configuration files support for clang-format.
> Some thoughts on desired features and overall design:
>    - *contents*: fields of the FormatStyle struct, which currently has <
>    20 fields of primitive types;
>    - *format*: a set of key-value pairs, most probably JSON or YAML with
>    flat structure, e.g.:
>      ColumnLimit: 80
>      ConstructorInitializerAllOnOneLineOrOnePerLine: true
>      ...
>    - *file location*: in a longer term we'd like to support local
>    per-project hierarchical model, so that style can be configured for a
>    project and then partially or fully overridden in its various subprojects.
>    E.g. for this directory structure:
>      dir:
>        .clang-format
>        a.cpp
>        subdir:
>          .clang-format
>          b.cpp
>    *clang-format dir/a.cpp* should read only dir/.clang-format (assuming
>    that there are no .clang-format files in parent directories), *clang-format
>    dir/subdir/b.cpp* should use configuration values from
>    dir/subdir/.clang-format, and for the values not defined there try to
>    get them from dir/.clang-format
>    - *command-line interface*: there's currently -style option which
>    takes a name of a predefined style, we can use "-style config" or "-style
>    file" to turn on configuration file parsing, or turn it on by default.
> Any comments/suggestions?
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