[PATCH] [clang-tidy] Add a checker for long functions.

[Benjamin Kramer]

Hi alexfh, djasper,

As this is very dependent on the code base it has some ways of configuration.
It's possible to pick between 3 modes of operation:

- Line counting: number of lines including whitespace and comments
- Statement counting: number of statements within compoundStmts.
- Cyclomatic complexity: calculated from the CFG.

In addition a threshold can be picked, warnings are only emitted when it is met.
Sadly this is not configurable at runtime yet as there is some plumbing missing.

http://reviews.llvm.org/D4986

Files:
  clang-tidy/misc/CMakeLists.txt
  clang-tidy/misc/FunctionLength.cpp
  clang-tidy/misc/FunctionLength.h
  clang-tidy/misc/MiscTidyModule.cpp
  unittests/clang-tidy/CMakeLists.txt
  unittests/clang-tidy/FunctionLengthCheckTest.cpp
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