logging: new makefile target to generate loglevels at compile time

Using shell commands, a bitmask is generated for each file. Additionally,
a C header containing an array of loglevels and their files is created in
include/loglevels.h.

Makefile

@@ -6,14 +6,14 @@ include $(TOPDIR)/common.mk
 AUTOGENERATED:=src/cfgparse.tab.c src/cfgparse.yy.c
 FILES:=$(filter-out $(AUTOGENERATED),$(wildcard src/*.c))
 FILES:=$(FILES:.c=.o)
-HEADERS=$(wildcard include/*.h)
+HEADERS:=$(filter-out include/loglevels.h,$(wildcard include/*.h))
 
 # Depend on the specific file (.c for each .o) and on all headers
 src/%.o: src/%.c ${HEADERS}
 	echo "CC $<"
-	$(CC) $(CFLAGS) -c -o $@ $<
+	$(CC) $(CFLAGS) -DLOGLEVEL="(1 << $(shell awk '/$(shell basename $< .c)/ { print NR }' loglevels.tmp))" -c -o $@ $<
 
-all: src/cfgparse.y.o src/cfgparse.yy.o ${FILES}
+all: loglevels.h src/cfgparse.y.o src/cfgparse.yy.o ${FILES}
 	echo "LINK i3"
 	$(CC) -o i3 ${FILES} src/cfgparse.y.o src/cfgparse.yy.o $(LDFLAGS)
 	echo ""
@@ -22,15 +22,30 @@ all: src/cfgparse.y.o src/cfgparse.yy.o ${FILES}
 	echo "SUBDIR i3-input"
 	$(MAKE) TOPDIR=$(TOPDIR) -C i3-input
 
+rm_loglevels:
+	rm -f loglevels.h
+
+loglevels.h: rm_loglevels
+	echo "LOGLEVELS"
+	for file in $$(ls src/*.c src/*.y src/*.l | grep -v 'cfgparse.\(tab\|yy\).c'); \
+	do \
+		echo $$(basename $$file .c); \
+	done > loglevels.tmp
+	(echo "char *loglevels[] = {"; for file in $$(cat loglevels.tmp); \
+	do \
+		echo -e "\t\"$$file\", "; \
+	done; \
+	echo "};") > include/loglevels.h
+
 src/cfgparse.yy.o: src/cfgparse.l
 	echo "LEX $<"
 	flex -i -o$(@:.o=.c) $<
-	$(CC) $(CFLAGS) -c -o $@ $(@:.o=.c)
+	$(CC) $(CFLAGS) -DLOGLEVEL="(1 << $(shell awk '/cfgparse.l/ { print NR }' loglevels.tmp))" -c -o $@ $(@:.o=.c)
 
 src/cfgparse.y.o: src/cfgparse.y
 	echo "YACC $<"
 	bison --debug --verbose -b $(basename $< .y) -d $<
-	$(CC) $(CFLAGS) -c -o $@ $(<:.y=.tab.c)
+	$(CC) $(CFLAGS) -DLOGLEVEL="(1 << $(shell awk '/cfgparse.y/ { print NR }' loglevels.tmp))" -c -o $@ $(<:.y=.tab.c)
 
 install: all
 	echo "INSTALL"

common.mk

@@ -74,5 +74,5 @@ endif
 .SILENT:
 
 # Always remake the following targets
-.PHONY: install clean dist distclean
+.PHONY: install clean dist distclean rm_loglevels