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Add style guide and formatting information #11669

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Sep 4, 2019
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@stuartmorgan stuartmorgan commented Aug 29, 2019

Updates CONTRIBUTING.md with style guide links for the engine languages, as well as a note about auto-formatting.

Addresses flutter/flutter#39442

Updates CONTRIBUTING.md with style guide links for the engine languages, as well as a note about auto-formatting.
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I'm not familiar with the Android code, so I don't know how true it is that we follow Google style there; maybe someone should weigh in on that aspect. (For C++/ObjC it's definitely not 100%, but for most of the code I've seen we are close enough that applying it more completely in the future wouldn't be a significant inconsistency.)

[Objective-C++](https://google.github.io/styleguide/objcguide.html#objective-c))
- [Java](https://google.github.io/styleguide/javaguide.html)

C++ and Objective-C/C++ files are formatted with `clang-format`, and GN files with `gn format`.
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We should clarify that clang-format must be invoked with the -file argument so that it picks up the .clang-format specification. By default, I don't think it respects the nearest .clang-format file. Also, mention that both clang-format and gn must be picked from either buildtools or third_party/gn so that folks don't end up using disparate versions of auto-formatter which may have slightly differing opinions on the same format.

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I was intending this to be advisory, rather than full instructions. I think if we want detailed instructions we should probably put them on another page and link to them from this sentence. Inlining instructions that work for all platforms would probably be more text than the page currently has...

@stuartmorgan stuartmorgan merged commit e2810dc into master Sep 4, 2019
engine-flutter-autoroll added a commit to engine-flutter-autoroll/flutter that referenced this pull request Sep 4, 2019
engine-flutter-autoroll added a commit to flutter/flutter that referenced this pull request Sep 5, 2019
git@github.com:flutter/engine.git/compare/e7f9ef6aa0b9...cd92039

git log e7f9ef6..cd92039 --no-merges --oneline
2019-09-04 mouad.debbar@gmail.com Handle new navigation platform messages (flutter/engine#11880)
2019-09-04 shihaohong@google.com Android 10+ View.getSystemGestureExclusionRects (flutter/engine#11451)
2019-09-04 aukwat@gmail.com Fix deleting Thai vowel bug on iOS (skip string range sanitization) (flutter/engine#11807)
2019-09-04 bkonyi@google.com Roll src/third_party/dart 4bd13a74d9..c3db2e3ee0 (4 commits)
2019-09-04 skia-flutter-autoroll@skia.org Roll src/third_party/skia c2dc9c864844..e7366841663b (2 commits) (flutter/engine#11878)
2019-09-04 iska.kaushik@gmail.com [flutter_runner] Add common libs to the test far (flutter/engine#11875)
2019-09-04 bkonyi@google.com Roll src/third_party/dart fd27e795ba..4bd13a74d9 (5 commits)
2019-09-04 aam@google.com Provide dart vm initalize isolate callback so that children isolates belong to parent's isolate group. (flutter/engine#9888)
2019-09-04 stuartmorgan@google.com Add style guide and formatting information (flutter/engine#11669)
2019-09-04 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from BR_-u... to LKWtB... (flutter/engine#11874)
2019-09-04 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from dRCdb... to m-hNV... (flutter/engine#11873)
2019-09-04 skia-flutter-autoroll@skia.org Roll src/third_party/skia 77743492418e..c2dc9c864844 (22 commits) (flutter/engine#11872)
2019-09-04 iska.kaushik@gmail.com Add a sample unit test target to flutter runner (flutter/engine#11847)
2019-09-04 iska.kaushik@gmail.com Support building standalone far packages with autogenerating manigests (flutter/engine#11849)
2019-09-04 bkonyi@google.com Roll src/third_party/dart 622747502e..fd27e795ba (9 commits)
2019-09-04 bkonyi@google.com Roll src/third_party/dart 54fdd559d8..622747502e (1 commits)
2019-09-04 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from KqidK... to BR_-u... (flutter/engine#11845)
2019-09-04 skia-flutter-autoroll@skia.org Roll src/third_party/skia 452ce044f0db..77743492418e (12 commits) (flutter/engine#11837)
2019-09-04 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from -kKi5... to dRCdb... (flutter/engine#11840)
2019-09-04 bkonyi@google.com Roll src/third_party/dart 36985859e4..54fdd559d8 (65 commits)
2019-09-04 chinmaygarde@google.com Minor tweaks to the Doxygen theme. (flutter/engine#11576)
2019-09-04 matthew-carroll@users.noreply.github.com Updated API usage in scenario app by deleting unnecessary method. (flutter/engine#11844)
2019-09-03 garyq@google.com Fix RTL justification alignment with newline (flutter/engine#11842)
2019-09-03 matthew-carroll@users.noreply.github.com Rename first frame method and notify FlutterActivity when full drawn (#38714 #36796). (flutter/engine#11357)
2019-09-03 skia-flutter-autoroll@skia.org Roll src/third_party/skia 8050d94ae227..452ce044f0db (1 commits) (flutter/engine#11834)
2019-09-03 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from a8wlq... to KqidK... (flutter/engine#11833)
2019-09-03 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from pVy4h... to -kKi5... (flutter/engine#11832)
2019-09-03 skia-flutter-autoroll@skia.org Roll src/third_party/skia 033c4014b788..8050d94ae227 (2 commits) (flutter/engine#11831)
2019-09-03 skia-flutter-autoroll@skia.org Roll src/third_party/skia 94c66475560d..033c4014b788 (2 commits) (flutter/engine#11830)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC franciscojma@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md
@tvolkert tvolkert deleted the contributing-style branch December 4, 2019 04:04
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