refactor ETL graph

sh/gen_etl_graph.sh

@@ -0,0 +1,45 @@
+
+
+
+# Work in progress ...
+#
+# generate ETL graph from a single layer 
+# start from the root 
+# parameter1: "layer name"  
+#   ./sh/gen_etl_graph.sh  waterway
+#
+# outut ->  ./doc/ 
+
+ID=$1 
+## ID=waterway
+
+mkdir -p ./doc
+layer_dir=./layers/${ID}/
+DOT=./doc/dot_${ID}.dot
+
+
+echo "digraph G
+{    
+rankdir=LR;
+" > $DOT
+
+if [  -f ${layer_dir}/mapping.yaml ]; then
+    echo "processing imposm3 mapping file ${layer_dir}/mapping.yaml "
+    cat ${layer_dir}/mapping.yaml    | grep    "# etldoc:" |  sed 's/# etldoc://g'  >>$DOT
+fi
+
+
+for f in ${layer_dir}*.sql
+do
+	echo "Processing : $f"
+    cat $f  | grep "\-\- etldoc:" |  sed 's/-- etldoc://g' >>$DOT
+done
+
+echo "
+}
+" >> $DOT
+
+##cat $DOT
+
+dot -Tpng $DOT > ./doc/etl_layer_${ID}.png
+dot -Tsvg $DOT > ./doc/etl_layer_${ID}.svg