# This builds the dash shell.
include ../build/Makefile-vars
# See https://github.com/sagemathinc/dash/releases which is a mirror of
# https://git.kernel.org/pub/scm/utils/dash/dash.git without the autotools dependency.
VERSION = 0.6.0
URL = https://github.com/sagemathinc/dash/archive/refs/tags/${VERSION}.tar.gz
TARBALL = ${UPSTREAM}/dash-${VERSION}.tar.gz
LIBEDIT_WASM = $(shell cowasm-package-path @cowasm/libedit)
TERMCAP_WASM = $(shell cowasm-package-path @cowasm/termcap)
POSIX_WASM = $(shell cowasm-package-path @cowasm/posix-wasm)
all: deps wasm ${BIN}/dash-wasm-raw
include ../build/Makefile-rules
${BUILD_WASM}/.patched: ${BUILD_WASM}/.build
cp ${SRC}/extra.h ${BUILD_WASM}/src/setjmp.h
mkdir -p ${BUILD_WASM}/src/bits
cp ${SRC}/extra.h ${BUILD_WASM}/src/bits/setjmp.h
ln -s ${SRC}/rebuild.sh ${BUILD_WASM}/rebuild.sh
ln -s ${SRC}/update.sh ${BUILD_WASM}/update.sh # for developing upstream
echo "ac_cv_func_sigsetmask=no" > ${BUILD_WASM}/config.site
cd ${BUILD_WASM} \
&& cat ${SRC}/patches/01-jobs-extra-include.patch | patch -p1 \
&& cat ${SRC}/patches/02-nodes-extra-include.patch | patch -p1 \
&& cat ${SRC}/patches/03-emacs-default.patch | patch -p1 \
&& cat ${SRC}/patches/04-vforkexec.patch | patch -p1
touch ${BUILD_WASM}/.patched
# NOTES:
# - -DJOBS=0 is to completely disable job control, which isn't supported for WASM yet.
# Right now the first place this fails is in savefd(int from, int ofd), where it uses
# a fcntl argument that is simply not implemented in WASI yet. We will probably have
# to rewrite savefd to use a non-wasi fcntl that we implement.
# - TODO: I'll probably move libedit and libtermcap to the core (OR their own shared library!)
# so they don't have to be included here, which will make dash much smaller. But for now this is fine.
# They add about 120KB.
${DIST_WASM}/.built: node_modules ${BUILD_WASM}/.patched
cd ../build && make zig
rm -rf ${DIST_WASM}
cd ${BUILD_WASM} \
&& CONFIG_SITE=${BUILD_WASM}/config.site \
CC="cowasm-cc" \
CC_FOR_BUILD="zig cc ${ZIG_NATIVE_CFLAGS_GNU}" \
CFLAGS="-O0 -fvisibility-main -DJOBS=0 -I${LIBEDIT_WASM}/include -I${POSIX_WASM}" \
LDFLAGS="-L${LIBEDIT_WASM}/lib -ledit -L${TERMCAP_WASM}/lib -ltermcap" \
./configure \
--with-libedit \
--prefix=${DIST_WASM} \
--host=none \
&& make -j8 install
ln -sf ${DIST_WASM}/bin/dash ${DIST_WASM}/bin/sh
touch ${DIST_WASM}/.built
${BIN}/dash-wasm-raw: ${DIST_WASM}/.built ${CWD}/bin/dash-wasm
ln -sf ${CWD}/bin/dash-wasm ${BIN}/dash-wasm-raw
test: node_modules ${DIST_WASM}/.built
# test doing a little arithmetic
echo "echo \$$((389*5077))" | cowasm ${DIST_WASM}/bin/dash | grep 1974953
# test that a syntax error doesn't terminate the shell (i.e., no longjmp exception handling)
echo "); echo 'I am still alive'" | cowasm ${DIST_WASM}/bin/dash | grep alive
