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ConformalLabpp/.clang-format
Tarik Moussa f1d77aa293
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quality: add code-style + CGAL-convention checkers (local-only)
Closes the gap "no code-quality / convention gate" from the structural
review.  Three new artefacts, all local-only (CI promotion deferred
until the existing tree is 100 % clean under each):

1. .clang-format — project's existing style mechanically captured
   (4-space indent, opening brace on new line for class/struct/function,
   left-aligned pointer/reference modifiers, aligned `using = ...` blocks,
   100-col loose limit, no include re-ordering — matches code/include/
   today).

2. scripts/quality/clang-format.sh — drift detector.  Dry-run mode by
   default (always exits 0); --strict to fail on drift; --fix to apply
   suggested changes in place.  Skips code/deps/ and macOS-duplicate
   files.

3. scripts/quality/cgal-conventions.py — checker for the CGAL idioms
   that clang-format/clang-tidy cannot express:
     CGAL-1  include-guard format `CGAL_<DIRS>_<FILE>_H`
     CGAL-2  every public header has a `\\file` Doxygen brief
     CGAL-3  no nested namespaces beyond the allowed set
             (CGAL::parameters, CGAL::Conformal_map, internal_np, IO)
     CGAL-4  named-parameter tag types end in `_t`; value object does not
     CGAL-5  no `using namespace ...` at file scope (header leakage)
     CGAL-6  no #define beyond CGAL_* / include-guard

   Result on the current tree: 6 CGAL public headers, 0 violations.
   The checker therefore doubles as documentation of the conventions
   we already follow.

Both are wired into scripts/quality/run-all.sh's fast subset (~5 s
combined wall time).  README.md updated to split the gates into a
"style/convention" group (cheap, run-on-every-commit material) and a
"correctness/quality" group (slow, run-before-tag material).

The reviewer-facing locked-vs-flexible.md gains another " Closed"
row documenting both gates and the 0-violation baseline.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-24 08:37:12 +02:00

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# conformallab++ formatting policy
#
# Captures the style already present in code/include/. Documented here
# so clang-format can enforce it locally (scripts/quality/clang-format.sh)
# and so new contributors get the same output their editor would on save.
#
# This is NOT the upstream CGAL clang-format (there isn't one published);
# it's the style our tree already uses, mechanically extracted.
BasedOnStyle: LLVM
Language: Cpp
Standard: c++17
IndentWidth: 4
TabWidth: 4
UseTab: Never
ColumnLimit: 100 # loose; readability over hard wrap
# Brace placement — matches the project tree:
# functions / methods → opening brace on a new line (CGAL convention)
# structs / classes → opening brace on a new line
# else / catch → on the same line as the closing brace of the preceding block
BreakBeforeBraces: Custom
BraceWrapping:
AfterClass: true
AfterStruct: true
AfterEnum: true
AfterFunction: true
AfterNamespace: false
AfterUnion: true
AfterControlStatement: false
BeforeElse: false
BeforeCatch: false
IndentBraces: false
SplitEmptyFunction: false
SplitEmptyRecord: false
SplitEmptyNamespace: true
# Reference & pointer modifiers attach to the type (`int& x`, not `int &x`).
PointerAlignment: Left
ReferenceAlignment: Left
# Aligned `using = ...` blocks are intentional in the trait classes.
AlignConsecutiveDeclarations: AcrossEmptyLines
AlignConsecutiveAssignments: AcrossEmptyLines
AlignTrailingComments: true
AlignAfterOpenBracket: Align
AllowShortFunctionsOnASingleLine: Inline
AllowShortIfStatementsOnASingleLine: Never
AllowShortLoopsOnASingleLine: false
AllowShortBlocksOnASingleLine: Never
AllowShortLambdasOnASingleLine: Inline
# Template-related: break before each parameter when the template line
# would otherwise exceed ColumnLimit (matches existing
# `template <typename TriangleMesh, typename ...>` patterns).
BreakBeforeBinaryOperators: NonAssignment
BinPackParameters: false
BinPackArguments: false
AlwaysBreakTemplateDeclarations: Yes
SpaceAfterTemplateKeyword: true
NamespaceIndentation: None
AccessModifierOffset: -4
IndentCaseLabels: false
# Includes: keep manual ordering — re-ordering can break Eigen / CGAL
# transitive-include assumptions in subtle ways. We just enforce no
# accidental duplicate blank lines.
SortIncludes: Never
MaxEmptyLinesToKeep: 1
KeepEmptyLinesAtTheStartOfBlocks: false
# Comments: don't touch.
ReflowComments: false