Add additional error handling to verification scripts

build_scripts/win/verify_formatting.cmd

@@ -5,5 +5,36 @@ REM As per above link, %~dp0 expands the zeroth arg to a drive letter and path o
 REM Project dir is up two dirs from the file.
 SET project_dir=%~dp0\..\..\
 
+ECHO %current_activity%: Testing if clang-format can be located:
+
+IF NOT DEFINED CLANG_FORMAT_LOC (
+    ECHO %current_activity%: CLANG_FORMAT_LOC not defined. Using default value.
+    SET CLANG_FORMAT_LOC="C:\Program Files\LLVM\bin\clang-format.exe"
+)
+ECHO %current_activity%: CLANG_FORMAT_LOC set to '%CLANG_FORMAT_LOC%'.
+
+REM EXIST won't find items in the PATH. WHERE will.
+SET CLANG_FORMAT_VALID=0
+IF EXIST %CLANG_FORMAT_LOC% SET CLANG_FORMAT_VALID=1
+IF %CLANG_FORMAT_VALID% EQU 0 (
+    WHERE /Q %CLANG_FORMAT_LOC%
+    IF NOT ERRORLEVEL 1 SET CLANG_FORMAT_VALID=1
+)
+
+IF %CLANG_FORMAT_VALID% EQU 1 (
+    ECHO %current_activity%: CLANG_FORMAT_LOC exists.
+) ELSE (
+    ECHO %current_activity%: CLANG_FORMAT_LOC directory does not exist. Exiting.
+    EXIT /B %exit_code_failure_build_locations%
+)
+
+ECHO %current_activity%: Clang-format located.
+
+%CLANG_FORMAT_LOC% --version
+
 python %project_dir%/build_scripts/run-clang-format.py %project_dir%/src -r --color never --clang-format-executable %CLANG_FORMAT_LOC%
-IF NOT ERRORLEVEL 1 THEN ECHO FORMATTED CORRECTLY.
+IF NOT ERRORLEVEL 1 (
+    ECHO FORMATTED CORRECTLY.
+) ELSE (
+    ECHO NOT FORMATTED CORRECTLY.
+)