[tools/find] Automation to build the 'find' grammar.

Not used yet.

Addresses issue #85.

build/dev.sh

@@ -190,16 +190,21 @@ minimal() {
   asdl/run.sh gen-typed-arith-asdl
 
   # Needed on Travis.
-  grammar
+  oil-grammar
+  find-grammar
 
   pylibc
   line-input
 }
 
-grammar() {
+oil-grammar() {
   oil_lang/grammar_gen.py marshal oil_lang/grammar.pgen2 _devbuild/gen
 }
 
+find-grammar() {
+  oil_lang/grammar_gen.py marshal tools/find/find.pgen2 _devbuild/gen
+}
+
 # Prerequisites: build/codegen.sh {download,install}-re2c
 all() {
   minimal

oil_lang/grammar_gen.py

@@ -126,14 +126,21 @@ def main(argv):
     grammar_path = argv[0]
     out_dir = argv[1]
 
+    basename, _ = os.path.splitext(os.path.basename(grammar_path))
+
+    # HACK for find:
+    if basename == 'find':
+      from tools.find import parse as find_parse
+      tok_def = find_parse.TokenDef()
+
     with open(grammar_path) as f:
       gr = pgen.MakeGrammar(f, tok_def=tok_def)
 
-    marshal_path = os.path.join(out_dir, 'grammar.marshal')
+    marshal_path = os.path.join(out_dir, basename + '.marshal')
     with open(marshal_path, 'wb') as out_f:
       gr.dump(out_f)
 
-    nonterm_path = os.path.join(out_dir, 'grammar_nt.py')
+    nonterm_path = os.path.join(out_dir, basename + '_nt.py')
     with open(nonterm_path, 'w') as out_f:
       gr.dump_nonterminals(out_f)