Reorganize into source, assets and libraries

The C sources move to source/, the served files to assets/, the bundled
Git submodule to libraries/git and the filter scripts to extensions/.
Everything the build generates now lands in build/, so a clean is a
single remove and the tree stays clean.

1 file changed, 35 insertions, 26 deletions

diff --git a/cgit.mk b/source/cgit.mk
index 3fcc1ca..d012349 100644
--- a/cgit.mk
+++ b/source/cgit.mk
@@ -1,22 +1,30 @@
-# This Makefile is run in the "git" directory in order to re-use Git's
-# build variables and operating system detection.  Hence all files in
-# CGit's directory must be prefixed with "../".
+# This Makefile runs inside the bundled Git tree (libraries/git) so that it
+# can reuse Git's build variables and platform detection. The top-level
+# Makefile invokes it as:
+#
+#     make -C libraries/git -f ../../source/cgit.mk ../../build/cgit
+#
+# so every path back into the project is prefixed with "../../": sources come
+# from ../../source and all build output goes to ../../build.
 include Makefile
 
-CGIT_PREFIX = ../
+# Locations relative to libraries/git, where this file is run.
+CGIT_PREFIX = ../../
+CGIT_SRC    = $(CGIT_PREFIX)source/
+CGIT_BUILD  = $(CGIT_PREFIX)build/
 
 -include $(CGIT_PREFIX)cgit.conf
 
-# The CGIT_* variables are inherited when this file is called from the
-# main Makefile - they are defined there.
+# The CGIT_* variables are inherited from the top-level Makefile.
 
-$(CGIT_PREFIX)VERSION: force-version
-	@cd $(CGIT_PREFIX) && '$(SHELL_PATH_SQ)' ./gen-version.sh "$(CGIT_VERSION)"
--include $(CGIT_PREFIX)VERSION
+$(CGIT_BUILD)VERSION: force-version
+	@mkdir -p $(CGIT_BUILD)
+	@cd $(CGIT_PREFIX) && '$(SHELL_PATH_SQ)' source/gen-version.sh "$(CGIT_VERSION)" build/VERSION
+-include $(CGIT_BUILD)VERSION
 .PHONY: force-version
 
-# CGIT_CFLAGS is a separate variable so that we can track it separately
-# and avoid rebuilding all of Git when these variables change.
+# CGIT_CFLAGS is tracked separately so that changing it does not force a
+# rebuild of Git itself.
 CGIT_CFLAGS += -DCGIT_CONFIG='"$(CGIT_CONFIG)"'
 CGIT_CFLAGS += -DCGIT_SCRIPT_NAME='"$(CGIT_SCRIPT_NAME)"'
 CGIT_CFLAGS += -DCGIT_CACHE_ROOT='"$(CACHE_ROOT)"'
@@ -95,16 +103,16 @@ CGIT_OBJ_NAMES += ui-summary.o
 CGIT_OBJ_NAMES += ui-tag.o
 CGIT_OBJ_NAMES += ui-tree.o
 
-CGIT_OBJS := $(addprefix $(CGIT_PREFIX),$(CGIT_OBJ_NAMES))
+CGIT_OBJS := $(addprefix $(CGIT_BUILD),$(CGIT_OBJ_NAMES))
 
-# Only cgit.c reference CGIT_VERSION so we only rebuild its objects when the
+# Only cgit.c references CGIT_VERSION, so only its objects rebuild when the
 # version changes.
-CGIT_VERSION_OBJS := $(addprefix $(CGIT_PREFIX),cgit.o cgit.sp)
-$(CGIT_VERSION_OBJS): $(CGIT_PREFIX)VERSION
+CGIT_VERSION_OBJS := $(addprefix $(CGIT_BUILD),cgit.o cgit.sp)
+$(CGIT_VERSION_OBJS): $(CGIT_BUILD)VERSION
 $(CGIT_VERSION_OBJS): EXTRA_CPPFLAGS = \
 	-DCGIT_VERSION='"$(CGIT_VERSION)"'
 
-# Git handles dependencies using ":=" so dependencies in CGIT_OBJ are not
+# Git handles dependencies using ":=" so dependencies in CGIT_OBJS are not
 # handled by that and we must handle them ourselves.
 cgit_dep_files := $(foreach f,$(CGIT_OBJS),$(dir $f).depend/$(notdir $f).d)
 cgit_dep_files_present := $(wildcard $(cgit_dep_files))
@@ -112,30 +120,31 @@ ifneq ($(cgit_dep_files_present),)
 include $(cgit_dep_files_present)
 endif
 
-ifeq ($(wildcard $(CGIT_PREFIX).depend),)
-missing_dep_dirs += $(CGIT_PREFIX).depend
+ifeq ($(wildcard $(CGIT_BUILD).depend),)
+missing_dep_dirs += $(CGIT_BUILD).depend
 endif
 
-$(CGIT_PREFIX).depend:
+$(CGIT_BUILD).depend:
 	@mkdir -p $@
 
-$(CGIT_PREFIX)CGIT-CFLAGS: FORCE
+$(CGIT_BUILD)CGIT-CFLAGS: FORCE
+	@mkdir -p $(CGIT_BUILD)
 	@FLAGS='$(subst ','\'',$(CGIT_CFLAGS))'; \
-	    if test x"$$FLAGS" != x"`cat ../CGIT-CFLAGS 2>/dev/null`" ; then \
+	    if test x"$$FLAGS" != x"`cat $(CGIT_BUILD)CGIT-CFLAGS 2>/dev/null`" ; then \
 		echo 1>&2 "    * new CGit build flags"; \
-		echo "$$FLAGS" >$(CGIT_PREFIX)CGIT-CFLAGS; \
+		echo "$$FLAGS" >$(CGIT_BUILD)CGIT-CFLAGS; \
             fi
 
-$(CGIT_OBJS): %.o: %.c GIT-CFLAGS $(CGIT_PREFIX)CGIT-CFLAGS $(missing_dep_dirs)
-	$(QUIET_CC)$(CC) -o $*.o -c $(dep_args) $(ALL_CFLAGS) $(EXTRA_CPPFLAGS) $(CGIT_CFLAGS) $<
+$(CGIT_OBJS): $(CGIT_BUILD)%.o: $(CGIT_SRC)%.c GIT-CFLAGS $(CGIT_BUILD)CGIT-CFLAGS $(missing_dep_dirs)
+	$(QUIET_CC)$(CC) -o $@ -c $(dep_args) $(ALL_CFLAGS) $(EXTRA_CPPFLAGS) $(CGIT_CFLAGS) $<
 
-$(CGIT_PREFIX)cgit: $(CGIT_OBJS) GIT-LDFLAGS $(GITLIBS)
+$(CGIT_BUILD)cgit: $(CGIT_OBJS) GIT-LDFLAGS $(GITLIBS)
 	@echo 1>&1 "    * $(LUA_MESSAGE)"
 	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS) $(CGIT_LIBS)
 
 CGIT_SP_OBJS := $(patsubst %.o,%.sp,$(CGIT_OBJS))
 
-$(CGIT_SP_OBJS): %.sp: %.c GIT-CFLAGS $(CGIT_PREFIX)CGIT-CFLAGS FORCE
+$(CGIT_SP_OBJS): $(CGIT_BUILD)%.sp: $(CGIT_SRC)%.c GIT-CFLAGS $(CGIT_BUILD)CGIT-CFLAGS FORCE
 	$(QUIET_SP)cgcc -no-compile $(ALL_CFLAGS) $(EXTRA_CPPFLAGS) $(CGIT_CFLAGS) $(SPARSE_FLAGS) $<
 
 cgit-sparse: $(CGIT_SP_OBJS)