Generate graphs for PEGs

.gitignore

@@ -1,3 +1,5 @@
 /nim.cfg
+*.dot
 *.html
 *.run
+*.svg

src/preserves/Tupfile

@@ -1,4 +1,8 @@
 include_rules
 NIM_FLAGS += --path:$(TUP_CWD)/..
-: foreach preserves_schema_nim.nim schemac.nim schemaparse.nim |> !nim_bin |> $(BIN_DIR)/%B | $(BIN_DIR)/<%B>
+: foreach preserves_schema_nim.nim schemaparse.nim |> !nim_bin |> $(BIN_DIR)/%B | $(BIN_DIR)/<%B>
 : foreach *hooks.nim |> !nim_check |>
+
+DOT_FILES = ../../Document.dot ../../Schema.dot
+: schemac.nim |> !nim_bin |> $(BIN_DIR)/%B | $(DOT_FILES) $(BIN_DIR)/<%B>
+: foreach $(DOT_FILES) |> dot -Tsvg -LO %f > %o |> ../../%B-Grammer-Graph.svg

src/preserves/schemac.nim.cfg

@@ -0,0 +1 @@
+d:npegDotDir:"../.."