reports.mk: cosmetic tweaks

reports.mk

@@ -2,16 +2,14 @@
 
 ifneq (,$(REPORT))
 
-BUILDDIR := $(shell sed -n 's/^.* BUILDDIR = \(.*\)/\1/p' "$$REPORT_PATH")
+BUILDDIR := $(shell sed -n 's/^.* BUILDDIR = \(.*\)/\1/p' "$(REPORT_PATH)")
 
 include lib/common.mk
+
 all: reports/targets reports/scripts
 
 reports/prep:
-	@if ! [ -n "$$REPORT_PATH" -a -s "$$REPORT_PATH" ]; then \
-		exit 0; \
-	fi; \
-	mkdir -p "$(BUILDDIR)/reports/"
+	@mkdir -p "$(BUILDDIR)/reports/"
 
 reports/scripts: reports/prep
 	@grep "^mki.*scripts: Run: " $(BUILDDIR)/$(BUILD_LOG) \
@@ -20,19 +18,21 @@ reports/scripts: reports/prep
 	&& echo "** scripts report: $(BUILDDIR)/$@.log" $(SHORTEN)
 
 reports/targets: reports/prep
-	@if [ ! -s "$$REPORT_PATH" ]; then exit 0; fi; \
+	@if ! [ -n "$(REPORT_PATH)" -a -s "$(REPORT_PATH)" ]; then \
+		exit 0; \
+	fi; \
 	if type -t dot >&/dev/null; then \
 		REPORT_IMAGE="$(BUILDDIR)/$@.png"; \
-		report-targets < "$$REPORT_PATH" \
+		report-targets < "$(REPORT_PATH)" \
 		| dot -Tpng -o "$$REPORT_IMAGE" \
 		&& echo "** target graph report: $$REPORT_IMAGE"; \
 	else \
 		REPORT_DOT="$(BUILDDIR)/targets.dot"; \
-		report-targets < "$$REPORT_PATH" > "$$REPORT_DOT" \
+		report-targets < "$(REPORT_PATH)" > "$$REPORT_DOT" \
 		&& echo "** graphviz missing, " \
 			"target graph dot file: $$REPORT_DOT"; \
 	fi $(SHORTEN); \
-	mv "$$REPORT_PATH" "$(BUILDDIR)/$@.log"
+	mv "$(REPORT_PATH)" "$(BUILDDIR)/$@.log"
 
 else
 all:; @: