webassembly: Build pyscript variant

This variant contains more Python modules from micropython-lib
Otherwise will get errors like this when trying to run in pyscript

    ImportError: no module named 'pathlib'

Author: jonnor

Makefile

@@ -16,10 +16,9 @@ C_MODULES_SRC_PATH = $(abspath ./src)
 
 ifeq ($(PORT),unix)
     MANIFEST_PATH=$(abspath ./src/manifest_unix.py)
-else
-    MANIFEST_PATH=$(abspath ./src/manifest.py)
 endif
 
+WEBASSEMBLY_MANIFEST_PATH=$(abspath ./src/manifest_webassembly.py)
 
 MODULES_PATH = ./dist/$(ARCH)_$(MPY_ABI_VERSION)
 PORT_DIR = ./dist/ports/$(PORT)
@@ -75,9 +74,9 @@ unix: $(UNIX_MICROPYTHON)
 $(WEBASSEMBLY_MICROPYTHON): $(PORT_DIR)
 	emcc --version
 	mkdir -p $(PORT_DIR)/../webassembly
-	make -C $(MPY_DIR)/ports/webassembly VARIANT=standard V=1 USER_C_MODULES=$(C_MODULES_SRC_PATH) FROZEN_MANIFEST=$(MANIFEST_PATH) CFLAGS_EXTRA="-Wno-unused-function -Wno-unused-function ${CFLAGS_EXTRA}" -j4
-	cp $(MPY_DIR)/ports/webassembly/build-standard/micropython.mjs $@
-	cp $(MPY_DIR)/ports/webassembly/build-standard/micropython.wasm dist/ports/webassembly/
+	make -C $(MPY_DIR)/ports/webassembly VARIANT=pyscript V=1 USER_C_MODULES=$(C_MODULES_SRC_PATH) FROZEN_MANIFEST=$(WEBASSEMBLY_MANIFEST_PATH) CFLAGS_EXTRA="-Wno-unused-function -Wno-unused-function ${CFLAGS_EXTRA}" -j4
+	cp $(MPY_DIR)/ports/webassembly/build-pyscript/micropython.mjs $@
+	cp $(MPY_DIR)/ports/webassembly/build-pyscript/micropython.wasm dist/ports/webassembly/
 
 
 webassembly: $(WEBASSEMBLY_MICROPYTHON)

src/manifest_webassembly.py

@@ -0,0 +1,36 @@
+
+include("$(PORT_DIR)/variants/manifest.py")
+
+# emlearn .py modules
+module("emlearn_trees.py", base_path='./emlearn_trees')
+module("emlearn_fft.py", base_path='./emlearn_fft')
+
+# The following are expected by pyscript
+# Ref https://github.com/micropython/micropython/blob/master/ports/webassembly/variants/pyscript/manifest.py
+require("abc")
+require("base64")
+require("collections")
+require("collections-defaultdict")
+require("copy")
+require("datetime")
+require("fnmatch")
+require("functools")
+require("gzip")
+require("hmac")
+require("html")
+require("inspect")
+require("io")
+require("itertools")
+require("locale")
+require("logging")
+require("operator")
+require("os")
+require("os-path")
+require("pathlib")
+require("stat")
+require("tarfile")
+require("tarfile-write")
+require("time")
+require("unittest")
+require("uu")
+require("zlib")