etl graph update, add graph test to travis (#741)

* etl graph update

re-ran `make generate-devdoc` which updated landuse graph

* Add travis test to check docs are up to date

.travis.yml

@@ -6,4 +6,5 @@ services:
   - docker
 
 script:
+  - TEST_MODE=yes make generate-devdoc
   - ./quickstart.sh

Makefile

@@ -7,6 +7,14 @@ DC_USER_OPTS?=$(DC_OPTS) -u $$(id -u $${USER}):$$(id -g $${USER})
 TOOLS_VERSION?=$(shell cat TOOLS_VERSION)
 export TOOLS_VERSION
 
+# If running in the test mode, compare files rather than copy them
+TEST_MODE?=no
+ifeq ($(TEST_MODE),yes)
+  COPY_TO_GIT=diff
+else
+  COPY_TO_GIT=cp
+endif
+
 .PHONY: all
 all: build/openmaptiles.tm2source/data.yml build/mapping.yaml build/tileset.sql
 
@@ -183,7 +191,7 @@ etl-graph:
 # generate etl graph for a certain layer, e.g. etl-graph-building, etl-graph-place
 etl-graph-%: layers/% build/devdoc
 	docker run $(DC_USER_OPTS) -v $$(pwd):/tileset openmaptiles/openmaptiles-tools:${TOOLS_VERSION} generate-etlgraph layers/$*/$*.yaml ./build/devdoc
-	cp ./build/devdoc/etl_$*.png layers/$*/etl_diagram.png
+	@$(COPY_TO_GIT) ./build/devdoc/etl_$*.png layers/$*/etl_diagram.png
 
 
 mappingLayers = $(notdir $(patsubst %/mapping.yaml,%, $(wildcard layers/*/mapping.yaml))) # layers with mapping.yaml
@@ -198,7 +206,7 @@ mapping-graph:
 
 mapping-graph-%: ./layers/%/mapping.yaml build/devdoc
 	docker run $(DC_USER_OPTS) -v $$(pwd):/tileset openmaptiles/openmaptiles-tools:${TOOLS_VERSION} generate-mapping-graph layers/$*/$*.yaml ./build/devdoc/mapping-diagram-$*
-	cp ./build/devdoc/mapping-diagram-$*.png layers/$*/mapping_diagram.png
+	@$(COPY_TO_GIT) ./build/devdoc/mapping-diagram-$*.png layers/$*/mapping_diagram.png
 
 # generate all etl and mapping graphs
 generate-devdoc: $(addprefix etl-graph-,$(layers)) $(addprefix mapping-graph-,$(mappingLayers))