#!/bin/bash
SRC=$(dirname 0ドル)
BUILD="1ドル"
CPYTHON_SRC="2ドル"
if [ "$CPYTHON_SRC" == "" ]; then
 CPYTHON_SRC=$(pwd)/upstream/cpython
fi
if [ "$BUILD" == "" ]; then
 BUILD=$(pwd)/build
fi
SRC=$(realpath "$SRC")
BUILD=$(realpath "$BUILD")
CPYTHON_BUILD=$BUILD/cpython
CPYTHON_NATIVE=$BUILD/cpython-native
# If we don't have a copy of cpython, make one
if [ ! -d $CPYTHON_SRC/ ]; then
 git clone --depth 1 https://github.com/python/cpython.git "$CPYTHON_SRC/"
 pushd $CPYTHON_SRC/
 # This is the last tested commit of cpython.
 # Feel free to try with a newer version
 COMMIT=b8a9f13abb61bd91a368e2d3f339de736863050f
 git fetch origin $COMMIT
 git reset --hard $COMMIT
 popd
fi
if [ ! -d $CPYTHON_NATIVE/ ]; then
 # Rever the cpython patch in case this runs after the wasm version reconfigures it.
 pushd $CPYTHON_SRC/
 git apply -R $SRC/patches/cpython.patch
 autoreconf -i
 popd
 mkdir -p $CPYTHON_NATIVE/
 pushd $CPYTHON_NATIVE/
 $CPYTHON_SRC/configure -C
 make -j$(nproc)
 popd
fi
if [ ! -d $CPYTHON_BUILD/ ]; then
 # Patch cpython to add a module to evaluate JS code.
 pushd $CPYTHON_SRC/
 git apply $SRC/patches/cpython.patch
 autoreconf -i
 popd
 mkdir -p $CPYTHON_BUILD/
 pushd $CPYTHON_BUILD/
 # Build cpython with asyncify support.
 # Disable sqlite3, zlib and bzip2, which cpython enables by default
 CONFIG_SITE=$CPYTHON_SRC/Tools/wasm/config.site-wasm32-emscripten \
 LIBSQLITE3_CFLAGS=" " \
 BZIP2_CFLAGS=" " \
 LDFLAGS="\
 -s ALLOW_MEMORY_GROWTH=1 \
 -s EXPORTED_FUNCTIONS=_main,_free,_malloc \
 -s EXPORTED_RUNTIME_METHODS=FS,PROXYFS,ERRNO_CODES,allocateUTF8 \
 -lproxyfs.js \
 --js-library=$SRC/emlib/fsroot.js \
 " emconfigure $CPYTHON_SRC/configure -C \
 --host=wasm32-unknown-emscripten \
 --build=$($CPYTHON_SRC/config.guess) \
 --with-emscripten-target=browser \
 --disable-wasm-dynamic-linking \
 --with-suffix=".mjs" \
 --disable-wasm-preload \
 --enable-wasm-js-module \
 --with-build-python=$CPYTHON_NATIVE/python \
 emmake make -j$(nproc)
 popd
fi
pushd $CPYTHON_BUILD/
emmake make -j$(nproc)
popd