Add code coverage report generation

.vscode/tasks.json

@@ -87,6 +87,23 @@
                 "kind": "build",
                 "isDefault": true
             }
+        },
+        {
+            "label": "coverage",
+            "type":"shell",
+            "command": "make coverage",
+            "problemMatcher": {
+                "base": "$gcc",
+                "owner": "gcc",
+                "fileLocation": [
+                    "relative",
+                    "${workspaceFolder}"
+                ]
+            },
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
         }
     ],
     "presentation": {

Makefile

@@ -6,7 +6,6 @@ CC = $(CROSS_COMPILE)gcc
 CPP = $(CROSS_COMPILE)cpp
 CHECK = cppcheck
 LCOV = lcov
-GENHTML = genhtml
 
 SRC_DIR = src
 OBJ_DIR = obj
@@ -51,7 +50,11 @@ coverage: $(UNIT_TEST_TARGET)
 	@rm -f $(UNIT_TEST_OBJ_DIR)/*.gcda
 	@rm -f $(UNIT_TEST_OBJ_DIR)/*.gcno
 	$(LCOV) -c -d obj -d bin/test/unit/ -d src/ -d test/unit/ -o test.info --no-external
-	$(GENHTML) -o coverage/html test.info
+	$(eval COVERAGE:=$(shell genhtml -o coverage/html test.info | grep 'lines' | egrep -o '[0-9]+.[0-9]+%'))
+	@echo
+	@echo Line coverage: $(COVERAGE)
+	@echo
+
 
 .PHONY: unit_test
 build_unit_test: $(UNIT_TEST_TARGET)