Let native code do the fast buffer overflow retry

Plus fixup the build and sdist due to autotoolization of GPX

MANIFEST.in

@@ -1,7 +1,8 @@
 include *.txt
 recursive-include octoprint_GPX *.js *.jinja2 *.less *.css
-recursive-include GPX *
-global-exclude *_obj/* *build/*
+recursive-include GPX *.h
+recursive-exclude GPX/build *
+include GPX/build/src/shared/config.h
 include versioneer.py
 include octoprint_GPX/_version.py
 include README.md

Makefile

@@ -2,13 +2,17 @@ SUBDIRS = GPX/build octoprint_GPX/static/less
 
 .PHONY: all clean test machines
 
-all:
-	python setup.py develop
+all: GPX/build
 	for dir in $(SUBDIRS); do \
 		echo "Entering $$dir"; \
 		make -C $$dir $@; \
 		echo "Exiting $$dir"; \
 	done
+	python setup.py develop
+
+GPX/build: GPX/configure
+	mkdir -p GPX/build
+	cd GPX/build ; ../configure ; cd ../..
 
 clean:
 	python setup.py clean

octoprint_GPX/gpxprinter.py

@@ -137,21 +137,13 @@ def write(self, data):
 						self._append(gpx.write("%s" % data))
 						break
 					except gpx.BufferOverflow:
-						# at first, let's do quick retries in case we're doing
-						# lots of short movements and we're just ahead of the
-						# bot
 						bo_retries += 1
-						if bo_retries < 10:
-							continue
-
-						# then let's slow down so we're not spinning, could be
-						# queued with lots of long moves or we could be paused
 						try:
 							if gpx.build_paused():
-								if bo_retries == 11:
+								if bo_retries == 1:
 									self._append("// echo: print paused at bot")
 								time.sleep(1) # 1 sec
-							elif bo_retries == 11:
+							elif bo_retries == 1:
 								self._append("// echo: buffer overflow")
 						except IOError:
 							pass

setup.py

@@ -93,7 +93,7 @@ def params():
 	ext_modules = [
 		setuptools.Extension('gpx',
 		sources = plugin_ext_sources,
-		extra_compile_args = ['-DGPX_VERSION="\\"OctoPrint\\""', '-DSERIAL_SUPPORT', '-fvisibility=hidden', '-IGPX/src/shared', '-IGPX/src/gpx'],
+		extra_compile_args = ['-DGPX_VERSION="\\"OctoPrint\\""', '-DSERIAL_SUPPORT', '-fvisibility=hidden', '-IGPX/build/src/shared', '-IGPX/src/shared', '-IGPX/src/gpx'],
 		extra_link_args = ['-fvisibility=hidden'])
 		]