Pronto runner for clang-tidy

Pronto runner for clang-tidy, a clang-based C++ "linter" tool. What is Pronto?

This runner can be used after running clang-tidy on a codebase to submit the reported offences to web-based git repo managers (e.g. github, gitlab, ...) as comments using Pronto.

First, the following prerequisites need to be installed:

1. clang-tidy
2. Ruby
3. Pronto, this can be done after installing Ruby using:

   gem install pronto
   

After that, pronto-clang_tidy can be installed using:

gem install pronto-clang_tidy

Pronto will look for clang-tidy output file and submit its contents as soon as this runner is installed.

After configuring and running clang-tidy on your codebase, redirect and save its standard output to a file (e.g. clang-tidy.out).

To do that, you can use my modified version of run-clang-tidy.py to automatically save clang-tidy output into clang-tidy.out:

python run-clang-tidy.py -checks=* -p build

where build is your build directory (that is, the directory that contains the generated file compile_commands.json).

The name of the clang-tidy output file can be configured by setting the environment variable PRONTO_CLANG_TIDY_OUTFILE prior to running pronto. If it is not set, the runner will assume the file name is clang-tidy.out.