test auto-generated sip files on Travis

ci/travis/code_layout/CMakeLists.txt

@@ -8,3 +8,4 @@ ENABLE_TESTING()
 
 ADD_TEST(qgis_indentation ${CMAKE_SOURCE_DIR}/../../../scripts/verify-indentation.sh)
 ADD_TEST(qgis_spelling ${CMAKE_SOURCE_DIR}/../../../scripts/spell_check/spell_test.sh)
+ADD_TEST(qgis_sip ${CMAKE_SOURCE_DIR}/../../../tests/scripts/test_auto_sipfiles.sh)

tests/scripts/test_auto_sipfiles.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+DIR=$(git rev-parse --show-toplevel)
+
+code=0
+
+while read -r line; do
+  header="src/$line"
+  sipfile=$(sed -E 's/(.*)\.h/python\/\1.sip/' <<< $line)
+  outdiff=$(${DIR}/scripts/sipify.pl ${DIR}/$header | diff ${DIR}/$sipfile -)
+  if [[ -n $outdiff ]]; then
+    if [[ $code == 0 ]]; then
+      echo "some sip files are not up to date:"
+      code=1
+    fi
+    echo "$sipfile"
+  fi
+done < ${DIR}/python/auto_sipfiles.txt
+
+exit $code