.gitlab-ci: Generate cppcheck reports

Modify the cppcheck job to also generate cppcheck's reports
and provide them as artifacts to the user.

.gitlab-ci.yml

@@ -225,17 +225,22 @@ merge-req:ubuntu-clang-other-tests:
   rules:
     - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
   script:
-    - apt-get install -y cppcheck clang-tools
+    - apt-get install -y cppcheck clang-tools python-pygments
     # build-ubuntu puts us in `build`.
     - cd ..
     - python3 tools/checklicenses.py
-    - ./tools/cppcheck/cppcheck.sh -l 1
+    - ./tools/cppcheck/cppcheck.sh -l 1 -x | tee cppcheck_report.xml
+    - if [[ -s "cppcheck_report.xml" ]]; then cppcheck-htmlreport --file cppcheck_report.xml  --report-dir . ; fi
     - cd build
     - cmake -DENABLE_EXTRA_COMPILER_WARNINGS=on -DENABLE_CHECKHF_CONFLICT=on -DCMAKE_EXPORT_COMPILE_COMMANDS=on -DENABLE_CCACHE=ON -G Ninja ..
     - ninja
     - ./run/tshark -v
     - sh -c '[ ! -e ../tools/validate-clang-check.sh ] || ../tools/validate-clang-check.sh'
     - ninja checkAPI
+  artifacts:
+    paths:
+      - cppcheck_report.xml
+      - cppcheck_report.html  
 
 # XXX This is still beta:
 # https://docs.gitlab.com/ee/user/gitlab_com/index.html#windows-shared-runners-beta

tools/cppcheck/cppcheck.sh

@@ -97,7 +97,7 @@ fi
 if [ "$LAST_COMMITS" -gt 0 ] ; then
     TARGET=$( git diff --name-only HEAD~"$LAST_COMMITS".. | grep -E '\.(c|cpp)$' )
     if [ -z "${TARGET//[[:space:]]/}" ] ; then
-        echo "No C or C++ files found in the last $LAST_COMMITS commit(s)."
+        >&2 echo "No C or C++ files found in the last $LAST_COMMITS commit(s)."
         exit_cleanup 0
     fi
 fi
@@ -106,7 +106,7 @@ if [ "$OPEN_FILES" = "yes" ] ; then
     TARGET=$(git diff --name-only  | grep -E '\.(c|cpp)$' )
     TARGET="$TARGET $(git diff --staged --name-only  | grep -E '\.(c|cpp)$' )"
     if [ -z "${TARGET//[[:space:]]/}" ] ; then
-        echo "No C or C++ files are currently opened (modified or added for next commit)."
+        >&2 echo "No C or C++ files are currently opened (modified or added for next commit)."
         exit_cleanup 0
     fi
 fi
@@ -128,9 +128,11 @@ fi
 # runs and we aren't left with broken HTML.
 trap : INT
 
-echo "Examining:"
-echo $TARGET
-echo
+if [ "$QUIET" = " " ]; then
+    echo "Examining:"
+    echo $TARGET
+    echo
+fi
 
 # shellcheck disable=SC2086
 $CPPCHECK --force --enable=style $QUIET    \