Clang-format config for FreeBSD style

[Alexander Richardson]

Hello all,

For CheriBSD I have added a .clang-format file[1] that (at least based
on some simple checking) gets reasonably close to existing style.
Is there any interest in adding this to the main repository so that
future patches can easily be formatted using git-clang-format or
clang-format-diff.
I find that clang-format increases my productivity when I submit
patches for LLVM since I can write my code, run git-clang-format and
then upload the patch to phabricator and know that I won't have to fix
lots of coding style errors before the patch can be submitted.
Would there be interest in adding this config file to the src repository?

I am not proposing mandatory clang-format before commit in a
phabricator hook, but I do wonder if this would be possible in the
future once clang-format produces correctly formatted code.
The attached config file gets close for some files that I tested but
there are definitely some line-wrapping changes that could cause
unncessary code churn if it was applied in bulk to existing code.
However, I do think that it could be useful for new patches (and makes
it easier for people like me who can't remember all the coding style
requirements for the different projects they contribute to).

Alex

[1]
# Basic .clang-format
---
BasedOnStyle: WebKit
AlignAfterOpenBracket: DontAlign
AlignConsecutiveAssignments: false
AlignConsecutiveDeclarations: false
AlignEscapedNewlines: Left
AlignOperands: false
AlignTrailingComments: false
AllowAllParametersOfDeclarationOnNextLine: false
AllowShortBlocksOnASingleLine: false
AllowShortCaseLabelsOnASingleLine: false
AllowShortFunctionsOnASingleLine: InlineOnly
AllowShortIfStatementsOnASingleLine: false
AllowShortLoopsOnASingleLine: false
AlwaysBreakAfterDefinitionReturnType: TopLevel
AlwaysBreakAfterReturnType: TopLevelDefinitions
BinPackArguments: true
BinPackParameters: true
BreakBeforeBinaryOperators: None
BreakBeforeBraces: WebKit
BreakBeforeTernaryOperators: false
# TODO: BreakStringLiterals can cause very strange formatting so turn it off?
# BreakStringLiterals: false
# Avoid breaking function calls before the first argument:
PenaltyBreakBeforeFirstCallParameter: 100000
CommentPragmas: '^ CHERI CHANGES START'
CompactNamespaces: true
DerivePointerAlignment: false
DisableFormat: false
ForEachMacros:
  - SLIST_FOREACH
  - SLIST_FOREACH_SAFE
  - LIST_FOREACH
  - LIST_FOREACH_SAFE
  - STAILQ_FOREACH
  - STAILQ_FOREACH_SAFE
  - TAILQ_FOREACH
  - TAILQ_FOREACH_SAFE
IndentCaseLabels: false
IndentPPDirectives: None
Language: Cpp
NamespaceIndentation: None
PointerAlignment: Right
ContinuationIndentWidth: 4
IndentWidth: 8
TabWidth: 8
ColumnLimit: 80
UseTab: Always
SortIncludes: false
...