COREPATH=../..

#include $(COREPATH)/Makefile.defs

CFG2TXT=../scripts/cdefs2doc/dump_selects.pl
CFG2DOCBOOK=../scripts/cdefs2doc/dump_selects.pl

# extra generators options
# use select_core.c to resolve possible chained select
CFG2TXT_EXTRA_OPTS=--core $(COREPATH)/select_core.c
CFG2DOCBOOK_EXTRA_OPTS=--core $(COREPATH)/select_core.c

# output directory for generated txt files
txt_output_dir=.
# output directory for generated docbook xml files
docbook_output_dir=docbook

# list of files containing selects defs in the following format:
# <filename>:<sel_grp_name> 
# can be easily updated by adding the output of:
#   make diff-list   (which obeys grp_exclude and file_exclude)
# or completely regenerated by replacing files_list with the output of:
#   make gen-files-list
files_list= \
	$(COREPATH)/select_core.c:core \
	$(COREPATH)/modules/tls/tls_select.c:tls \
	$(COREPATH)/modules/tm/select.c:tm \
	$(COREPATH)/modules/xmlrpc/xmlrpc.c:xmlrpc \
	$(COREPATH)/modules_s/avp/avp.c:avp \
	$(COREPATH)/modules_s/db_ops/db_ops.c:db_ops \
	$(COREPATH)/modules_s/eval/eval.c:eval \
	$(COREPATH)/modules_s/nathelper/nathelper.c:nathelper \
	$(COREPATH)/modules_s/rr/rr_mod.c:rr \
	$(COREPATH)/modules_s/textops/textops.c:textops \
	$(COREPATH)/modules_s/timer/timer.c:timer



# list of excluded groups
grp_exclude=pa iptrtpproxy
# list of file prefixes to exclude (full path needed)
file_exclude= $(COREPATH)/modules_s/tls/ \
              $(COREPATH)/modules/iptrtpproxy/

# special per file group overrides
# format= grp_filename=... ,where filename does not contain the extension
# e.g.:
#     grp_f_tcp_options=tcp
#     grp_f_sctp_options=sctp

# special per group group name overrides
# e.g.:
#      grp_g_maxfwd=mf

# override auto-detected group if set to 1 (else the group is used inside the
# file only if it cannot be aut-odetected)
ifeq ($(group_override),1)
override force_grp=force-
else
override force_grp=
endif

# command used for gcc (contains extra includes)
gcc=gcc
#-I$(COREPATH)/lib -I$(COREPATH) -I/usr/include/libxml2

# defines used by gcc
c_defs=-D__CPU_i386 -D__OS_linux -DSER_VER=2099099 -DPKG_MALLOC -DSHM_MEM  \
		-DSHM_MMAP -DDNS_IP_HACK -DUSE_MCAST -DUSE_TCP \
		-DUSE_DNS_CACHE -DUSE_DNS_FAILOVER -DUSE_DST_BLACKLIST -DUSE_NAPTR \
		-DUSE_TLS -DTLS_HOOKS -DFAST_LOCK   -DCC_GCC_LIKE_ASM \
		-DHAVE_GETHOSTBYNAME2 -DHAVE_UNION_SEMUN -DHAVE_SCHED_YIELD \
		-DHAVE_MSG_NOSIGNAL -DHAVE_MSGHDR_MSG_CONTROL -DHAVE_ALLOCA_H \
		-DHAVE_SCHED_SETSCHEDULER -DHAVE_EPOLL -DUSE_SCTP -DNAME='\"ser\"' \
		-DVERSION='\"2.99.99-pre3\"' -DARCH='\"i386\"' -DOS_QUOTED='\"linux\"'


# common makefile vars used in defs
LOCALBASE=/usr/local
SYSBASE=/usr

filter_files=$(subst .h:,.c:, $(filter-out $(addsuffix %,$(file_exclude)),\
				$(filter-out $(addprefix %:,$(grp_exclude)),$(1))) )

#filtered files list
flist=$(call filter_files,$(files_list))

# throws an error if input is not in the format filename:grp
check_fname_grp=$(if $(filter-out 2,$(words $(subst :, ,$(1)))),\
					$(error bad format "$(1)", it should be filename:grp))

# get prereq from file:grp (get_prereq(file:grp) => file)
get_prereq=$(firstword $(subst :, ,$(1)))

# get grp from file:grp (get_grp(file:grp) => grp)
get_listed_grp=$(word 2, $(subst :, ,$(1)))

# get base file name from file:grp: get_bname(file:grp) 
# => basename(file) without extension (e.g. get_bname(foo/bar.c:x) => bar)
# 
get_bname=$(basename $(notdir $(call get_prereq,$(1))))

#get grp from file:grp, using the overrides
get_grp=$(strip $(if $(grp_f_$(call get_bname,$(1))), \
					$(grp_f_$(call get_bname,$(1))),\
					$(if $(grp_g_$(call get_listed_grp,$(1))),\
						$(grp_g_$(call get_listed_grp,$(1))),\
						$(call get_listed_grp,$(1))) ) )

# get target from file:grp (get_target(file:grp) => select_grp)
get_target=select_$(call get_grp,$(1))


# $(LF) definition (do not remove)
define LF


endef

# get all the lines containing DEFS or INCLUDES definitions from the Makefile.
# WARNING: does not work with all sed implementation (tested with GNU sed).
# It uses a hack to restore the LFs (LFs are removed by $(shell)): LFs are
# replaced with '^LF^' and then ^LF^ is subst'ed back to a real LF.
get_make_idefs=$(subst ^LF^,$(LF),$(shell sed \
 -ne '/^[\t ]*\(DEFS\|INCLUDES\)[\t ]*[+:]\?=.*[^\]$$/H'\
 -ne '/^[\t ]*\(DEFS\|INCLUDES\)[\t ]*[+:]\?=.*\\$$/,/\(^$$\)\|\([^\]$$\)/H'\
 -ne '$${g;s/\n/^LF^/g;p}'\
< $(1)/Makefile ))


# get all the lines from the makefile containing variable definitions.
# It will also return conditionals and try to filter out possible rules.
# WARNING: does not work with all sed implementation (tested with GNU sed).
# It uses a hack to restore the LFs (LFs are removed by $(shell)): LFs are
# replaced with '^LF^' and then ^LF^ is subst'ed back to a real LF.
get_make_vars=$(subst ^LF^,$(LF),$(shell sed -n \
 -e ': start' \
 -e '/^\(ifeq\|ifneq\|else\|endif\)[\t ]*\($$\|.*[^\]$$\)/{H;b end}' \
 -e '/^\(ifeq\|ifneq\|else\|endif\)[\t ]\+.*[\]$$/,/[^\]$$/{H;b end}' \
 -e '/^[a-zA-Z._/$$][a-zA-Z0-9._()/$$ \t-]*:\([^=]\|$$\)/b eat_rule' \
 -e '/^[\t ]*[A-Za-z._][A-Za-z0-9._-]*[\t ]*[+:]\?=.*[^\]$$/{H;b end}' \
 -e '/^[\t ]*[A-Za-z._][A-Za-z0-9._-]*[\t ]*[+:]\?=.*\\$$/,/\(^$$\)\|\([^\]$$\)/{H;b end}' \
 -e ': end' \
 -e '$${g;s/\n/^LF^/g;p}'\
 -e 'b' \
 -e ': eat_rule' \
 -e '$$b end' \
 -e 'n' \
 -e '/^[a-zA-Z._/$$][a-zA-Z0-9._()/$$ \t-]*:\([^=]\|$$\)/b eat_rule' \
 -e '/^[\t]/b eat_rule' \
 -e 'b start' \
< $(1)/Makefile ))


define  mk_rules

$(call check_fname_grp, $(1))

#$$(info generating select_$$(call get_grp,$(1)).txt: $$(call get_prereq,$(1)))


DEFS:=
INCLUDES:=
# extract all the includes and defs from the module makefile and
# evaluate them
$$(eval $$(call get_make_vars,$$(dir $$(call get_prereq,$(1)))))
# override COREPATH (we know better)
COREPATH=../..
# save the result in a per group e_idefs_<grp_name> var
$$(eval e_idefs_$$(call get_grp,$(1)):=$$(DEFS) $$(INCLUDES))

# debugging:
#$$(info eval: $$(call get_make_vars,$$(dir $$(call get_prereq,$(1)))))
#$$(info e_idefs_$$(call get_grp,$(1))=$$(e_idefs_$$(call get_grp,$(1))))

$(txt_output_dir)/$$(call get_target,$(1)).txt: \
								$$(call get_prereq,$(1)) Makefile $(CFG2TXT)
	$(CFG2TXT) --file $$< --$(force_grp)grp=$$(call get_grp,$(1)) \
		--gcc="$(gcc)" --txt  $(CFG2TXT_EXTRA_OPTS) \
		--defs="$(c_defs) $$(e_idefs_$$(call get_grp,$(1)))" \
		> "$$@" || (rm -f "$$@"; exit 1)

$(docbook_output_dir)/$$(call get_target,$(1)).xml: \
								$$(call get_prereq,$(1)) Makefile $(CFG2TXT)
	$(CFG2DOCBOOK) --file $$< --$(force_grp)grp=$$(call get_grp,$(1)) \
		--gcc="$(gcc)" --docbook $(CFG2DOCBOOK_EXTRA_OPTS) \
		--defs="$(c_defs) $$(e_idefs_$$(call get_grp,$(1)))" \
		> "$$@" || (rm -f "$$@"; exit 1)


clean_$$(call get_target,$(1)).txt:
	rm -f "$(txt_output_dir)/$$(call get_target,$(1)).txt"

clean_$$(call get_target,$(1)).xml:
	rm -f "$(docbook_output_dir)/$$(call get_target,$(1)).xml"

txt: $(txt_output_dir)/$$(call get_target,$(1)).txt

docbook: $(docbook_output_dir)/$$(call get_target,$(1)).xml

clean_txt: clean_$$(call get_target,$(1)).txt

clean_docbook: clean_$$(call get_target,$(1)).xml


endef

find_sel_files_cmd= find $(COREPATH) -type f -name "*.[ch]" \
		-exec grep "select_row_t[	 ][a-zA-Z0-9_][a-zA-Z0-9_]*\[\][	 ]*=" \
		/dev/null {} \; \
		| cut -d: -f1

# shell command to generate a file:grp list from a list of files
# grp will be the modulename if the file is in a module directory or
# the file name with the extension and _sel, sel_, select_, _select,
# _declaration or _table stripped out of it.
# output: list of  " "filename":"grpname
gen_file_grp_cmd=\
sed -e "s!\(.*/modules[^/]*/\([^/][^/]*\)/.*\)! \1:\2!" \
    -e "s!^\([^ ].*/\([^/.]*\)[^/]*$$\)!\1:\2!" \
    -e "s!^\([^ :]*\):\(.*\)_select[_]*!\1:\2!" \
    -e "s!^\([^ :]*\):\(.*\)select[_]*!\1:\2!" \
    -e "s!^\([^ :]*\):\(.*\)_declaration[_]*!\1:\2!" \
    -e "s!^\([^ :]*\):\(.*\)_table[_]*!\1:\2!" \
    -e "s!^\([^ :]*\):\(.*\)_sel[_]*!\1:\2!" \
    -e "s!^\([^ :]*\):\(.*\)sel[_]*!\1:\2!" \

# special vars for generating the list of files or updates
found_lst=$(shell $(find_sel_files_cmd) | $(gen_file_grp_cmd))
# filtered found lst
f_found_lst=$(call filter_files,$(found_lst))
diff_lst=$(filter-out $(flist),$(f_found_lst))


get_core_files=$(filter-out $(COREPATH)/modules% $(COREPATH)/lib%,$(1))
sort_files=$(sort $(call get_core_files,$(1)))\
			$(sort $(filter-out $(call get_core_files,$(1)),$(1)))

# replace $(COREPATH) with the text "$(COREPATH)"
subst_corepath=$(patsubst $(patsubst %/,%,$(COREPATH))/%,\$$(COREPATH)/%,$(1))


# help will be the default rule (on-purpose since without having a patched
# GCC:TranslationUnit module, make all won't work)
.PHONY: help
help:
	@echo "To regenerate $(foreach f,$(flist),$(call get_target,$f).{txt,xml})"
	@echo "type: $(MAKE) all ."
	@echo "or to regenerate all the select lists by searching all"
	@echo " the source files for definitions, type: $(MAKE) autogen ."
	@echo "NOTE: you need the GCC:TranslationUnit perl module with an "
	@echo "extra patch applied (see $(CFG2TXT) --patch)."

.PHONY: txt
txt:

.PHONY: docbook
docbook:

.PHONY: clean_txt
clean_txt:

.PHONY: clean_docbook
clean_docbook:


.PHONY: all
all: txt $(docbook_output_dir)/select_list.xml

.PHONY: clean
clean: clean_txt clean_docbook
	@rm -f $(docbook_output_dir)/select_list.xml

.PHONY: proper
proper:
	@rm -f $(txt_output_dir)/select_*.txt
	@rm -f $(docbook_output_dir)/select_*.xml

repo_ver="sip-router"\
	"git-$(shell  git rev-parse --verify --short=6 HEAD 2>/dev/null)"
ifeq ($(repo_ver),git-)
repo_ver="sip-router unknown"
endif

$(docbook_output_dir)/select_list.xml: Makefile \
		$(foreach f,$(flist),$(docbook_output_dir)/$(call get_target,$f).xml)
	@echo '<?xml version="1.0" encoding="UTF-8"?>' >$@
	@echo '<!-- this file is autogenerated, do not edit! -->' >>$@
	@echo '<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"' >>$@
	@echo '	"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"' >>$@
	@echo '	[ <!ENTITY % local.common.attrib' >>$@
	@echo "	 \"xmlns:xi CDATA #FIXED 'http://www.w3.org/2001/XInclude'\">]">>$@
	@echo '>' >>$@
	@echo '<book id="select_list"'\
		'xmlns:xi="http://www.w3.org/2001/XInclude">' >>$@
	@echo '	<title>Select List</title>' >>$@
	@echo '	<bookinfo><revhistory><revision>' >>$@
	@echo '		<revnumber>'$(repo_ver)'</revnumber>' >>$@
	@echo '		<date>'`date -R`'</date>' >>$@
	@echo '		<revremark>' >>$@
	@echo "			Automatically generated by:">>$@
	@echo "			$(MAKE) -C doc/select_list $(MAKECMDGOALS)" >>$@
	@echo '		</revremark>' >>$@
	@echo '	</revision></revhistory></bookinfo>' >>$@
	@echo '		<xi:include href="intro.xml"/>' >>$@
	@$(foreach f,$(flist),\
		echo '		<xi:include'\
			'href="'$(call get_target,$f).xml'"/>' \
			>>$@ ; )
	@echo '</book>' >>$@

# finds all the files containing select defs
.PHONY: find
find:
	@$(find_sel_files_cmd)

# print the list of the autogenerated files
.PHONY: print-lst
print-lst:
	@$(find_sel_files_cmd) | $(gen_file_grp_cmd)

#
.PHONY: gen-file-list
.PHONY: gen-files_list
.PHONY: gen_files_list
gen-file-list gen-files-list gen_files_list:
	@$(foreach f,$(call subst_corepath,$(call sort_files,$(f_found_lst))),\
		echo "$f \\";)

.PHONY: check-list
.PHONY: update-list
.PHONY: diff-list
check-list update-list diff-list:
	@$(foreach f,$(call subst_corepath,$(call sort_files,$(diff_lst))),\
		echo "$f \\";)


# try to generate the docs from all the sources
.PHONY: autogen
autogen:
	@$(MAKE) all files_list="$(call sort_files,$(f_found_lst))"

$(foreach f,$(flist),$(eval $(call mk_rules,$(f))))