Turn on ASDL code generation in the default dev build.

Move generated Python code _devbuild/gen, where the generated C code
lives.

I tested this with the app bundle, and it works.

README.md

@@ -92,6 +92,7 @@ Directory Structure
    _bin/             # Native executables are put here
    _build/           # Temporary build files
    _devbuild/        # Developer build files not deleted upon 'make clean'
      gen/            # Generated Python and C code
    _deps/            # build dependencies like re2c
    _tmp/             # Test suites and other temp files
      spec/

asdl/run.sh

@@ -64,9 +64,10 @@ gen-python() {
  asdl/gen_python.py $schema
}

# For testing only, build/dev.sh has it
gen-osh-python() {
  touch _tmp/__init__.py
  local out=_devbuild/osh_asdl.py
  local out=_devbuild/gen/osh_asdl.py
  mkdir -p _devbuild/gen
  gen-python osh/osh.asdl > $out
  wc -l $out
}

build/dev.sh

@@ -31,6 +31,12 @@ gen-help() {
  #build/doc.sh oil-quick-ref
}

gen-osh-asdl() {
  local out=_devbuild/gen/osh_asdl.py
  PYTHONPATH=. asdl/gen_python.py osh/osh.asdl > $out
  echo "Wrote $out"
}

# TODO: should fastlex.c be part of the dev build?  It means you need re2c
# installed?  I don't think it makes sense to have 3 builds, so yes I think we
# can put it here for simplicity.
@@ -71,7 +77,12 @@ clean() {

# No fastlex, because we don't want to require re2c installation.
minimal() {
  mkdir -p _devbuild/gen
  # so osh_help.py and osh_asdl.py are importable
  touch _devbuild/__init__.py  _devbuild/gen/__init__.py

  gen-help
  gen-osh-asdl
  pylibc
}

build/doc.sh

@@ -64,10 +64,9 @@ x-quick-ref() {

  local html_out=$out_dir/doc/$prog-quick-ref.html
  local text_out_dir=_build/$prog-quick-ref
  local py_out=_devbuild/${prog}_help.py
  local py_out=_devbuild/gen/${prog}_help.py

  mkdir -p _build/doc $text_out_dir _devbuild
  touch _devbuild/__init__.py  # so osh_help is importable
  mkdir -p _build/doc $text_out_dir

  {
    cat <<EOF

core/builtin.py

@@ -36,7 +36,7 @@

from osh import lex

from _devbuild import osh_help  # generated file
from _devbuild.gen import osh_help  # generated file

value_e = runtime.value_e
scope_e = runtime.scope_e

osh/ast_.py

@@ -129,13 +129,14 @@ def LoadSchema(f):
asdl_module, type_lookup = LoadSchema(f)

root = sys.modules[__name__]
if 1:
if 0:
  py_meta.MakeTypes(asdl_module, root, type_lookup)
  f.close()
else:
  # Export for generated code to look at
  # Exported for the generated code to use
  TYPE_LOOKUP = type_lookup

  # Get the types from elsewhere
  from _devbuild import osh_asdl
  from _devbuild.gen import osh_asdl
  py_meta.AssignTypes(osh_asdl, root)

f.close()