feat(cpplint): Port cpplint to Python 3 (#629)

- Replace Python 2 script with Python 3
- Update bootstrap script to comply with ShellCheck SC2038

.clang-tidy

@@ -1,3 +1,3 @@
-Checks: 'clang-diagnostic-*,clang-analyzer-*,google-*,cppcoreguidelines-*,modernize-*,performance-*,portability-*,readability-*,misc-*,-modernize-use-trailing-return-type,-readability-magic-numbers,-cppcoreguidelines-avoid-magic-numbers'
+Checks: 'clang-diagnostic-*,clang-analyzer-*,google-*,cppcoreguidelines-*,modernize-*,performance-*,portability-*,readability-*,misc-*,-modernize-use-trailing-return-type,-readability-magic-numbers,-cppcoreguidelines-avoid-magic-numbers','-readability-identifier-length'
 WarningsAsErrors: '*,-modernize-use-using'
 FormatStyle: file

.github/workflows/lint.yml

@@ -15,7 +15,7 @@ jobs:
         run: |
           sudo apt update
           sudo apt build-dep -y .
-          sudo apt install -y clang clang-format clang-tidy python2
+          sudo apt install -y clang clang-format clang-tidy python3
 
       - name: Compile
         run: |

cmake/check-code-style.cmake

@@ -23,11 +23,11 @@ else()
   endif()
 endif()
 
-find_program(PYTHON_EXEC NAMES "python2")
+find_program(PYTHON_EXEC NAMES "python3")
 if(NOT PYTHON_EXEC)
-  message(WARNING "Check for python2: Not found, cpplint.py will not be executed")
+  message(WARNING "Check for python3: Not found, cpplint.py will not be executed")
 else()
-  message(STATUS "Check for python2: Found")
+  message(STATUS "Check for python3: Found")
   execute_process(
     COMMAND ./cmake/run-cpplint-py.sh
     WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}