#  $HeadURL$ $LastChangedRevision$
#
#  This makefile will turn a single file called training-route-gpswandern.gpx that contains
#  *multiple* routes with names like '01 - Ammersee loop (126km)' into a single file called
#  training-route-combined.gpx that contains multiple routes with names like '01.00', '01.01',
#  '01.02', '02', '03', where each such route is either a chunk of or the whole of the
#  corresponding original route.
#
#  Alexis's workflow is as follows:
#
#  - visit http://www.gpswandern.de/gorp/gorp.shtml
#  - load the training-route-gpswandern.gpx route file
#  - add new training routes, edit old ones, etc
#  - decide which training route I will do next time, just noting the number at the beginning 
#    of the name, e.g. 01.
#  - save the new routes back to the same file
#  - run 'make' with this Makefile in the same directory as the GPX file
#  - copy training-route-combined.gpx to the GPS
#  - on training day navigate route 01.00, then 01.01, then 01.02, etc.

GPXSPLIT_CHUNK_CMD = gpxsplit-chunk
GPXSPLIT_UNBUNDLE = gpxsplit-unbundle
CHUNK_SIZE = 250
STEM = training-route

default: $(STEM)-combined.gpx

$(STEM)-combined.gpx: gpxsplitted.timestamp
	eval "gpsbabel -r -i gpx $$(for F in .gpxsplitted/[0-9]*.gpx; do echo -n "-f $$F "; done) -o gpx -F $@"

gpxsplitted.timestamp: choppedup.timestamp
	rm -fr .gpxsplitted
	mkdir .gpxsplitted
	cd .gpxsplitted && $(GPXSPLIT_CHUNK_CMD) --count=$(CHUNK_SIZE) ../.choppedup/*.gpx
	touch $@

choppedup.timestamp: .$(STEM)-unixified.gpx
	rm -fr .choppedup
	mkdir .choppedup
	cd .choppedup && $(GPXSPLIT_UNBUNDLE) $(patsubst %.gpx, ../%.gpx, $^)
	touch $@

#  Geo::Gpx doesn't like DOS line endings *in some situations*. The error I was seeing was:
#
#      gpxsplit: INFO: ../choppedup/05-in2reg.gpx: processing file ...
#      
#      not well-formed (invalid token) at line 317, column 1, byte 8682 at /usr/share/perl5/XML/TokeParser.pm line 353.
#      Makefile:8: recipe for target 'gpxsplitted' failed
#      make: *** [gpxsplitted] Error 255
#
#  So Unixify the file before we start.
.$(STEM)-unixified.gpx: $(STEM)-gpswandern.gpx
	cat $^ | dos2unix > $@

clean:
	rm -fr .gpxsplitted .choppedup .$(STEM)-unixified.gpx *.timestamp $(STEM)-combined.gpx