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#!/usr/bin/env bash
###
### a simple complement to bild which only deals with launching repls
###
### > repl [opts] <target..>
###
### Starts a repl/shell for one or more targets. (Currently, all targets must
### have the same extension for this to work.) Repls started with this script
### should bind to `localhost:$PORT`.
###
### Options:
### --bash start bash instead of the target language repl
help() {
sed -rn 's/^### ?//;T;p' "$0"
}
if [[ $# == 0 ]] || [[ "$1" == "-h" ]]; then
help
exit 1
fi
##
set -e
CMD=
if [[ "$1" == "--bash" ]]; then
CMD="bash"
shift
fi
targets="${*:?}"
json=$(bild --plan "${targets[@]}")
mapfile -t langdeps < <(jq --raw-output '.[].langdeps | select(length > 0) | join("\n")' <<< "$json")
mapfile -t sysdeps < <(jq --raw-output '.[].sysdeps | select(length > 0) | join("\n")' <<< "$json")
mapfile -t rundeps < <(jq --raw-output '.[].rundeps | select(length > 0) | join("\n")' <<< "$json")
exts=$(jq --raw-output '.[].namespace.ext' <<< "$json" | sort | uniq)
packageSet=$(jq --raw-output '.[].packageSet' <<< "$json")
module=$(jq --raw-output '.[].mainModule' <<< "$json")
BILD="(import ${CODEROOT:?}/Biz/Bild.nix {})"
declare -a flags=(--packages "$BILD.pkgs.pkg-config")
for lib in "${sysdeps[@]}"; do
flags+=(--packages "$BILD.pkgs.${lib}")
done
for lib in "${rundeps[@]}"; do
flags+=(--packages "$BILD.pkgs.${lib}")
done
case $exts in
C)
flags+=(--packages "$BILD.pkgs.gcc")
command="bash"
;;
Hs)
if [ -z ${var+PORT} ]; then
echo "warn: repl: ghci does not support binding to a port"
fi
flags+=(--packages "$BILD.haskell.ghcWith (h: with h; [${langdeps[*]}])")
command=${CMD:-"ghci -i${CODEROOT:?} -ghci-script ${CODEROOT:?}/.ghci ${targets[@]}"}
;;
Scm)
for lib in "${langdeps[@]}"; do
flags+=(--packages "$BILD.guile-${lib}")
done
flags+=(--packages "$BILD.guile")
command=${CMD:-"guile -L ${CODEROOT:?} -C ${CODEROOT:?}/_/int --r7rs --listen=${PORT:-37146}"}
;;
Lisp)
flags+=(--packages "$BILD.$packageSet (p: with p; [asdf swank ${langdeps[*]}])")
command=${CMD:-"sbcl --eval '(require :asdf)' --eval '(require :swank)' --eval '(swank:create-server :port ${PORT:-4005})' --load $targets"}
;;
Rs)
flags+=(--packages "$BILD.pkgs.rustc")
command=bash
;;
Py)
langdeps+=("mypy")
flags+=(--packages "$BILD.python.pythonWith (p: with p; [${langdeps[*]}])")
PYTHONPATH=$CODEROOT:$PYTHONPATH
pycommand="python -i $CODEROOT/Biz/Repl.py $module ${targets[*]}"
command=${CMD:-"$pycommand"}
;;
*)
echo "unsupported targets: ${targets[*]}"
exit 1
;;
esac
##
nix-shell "${flags[@]}" --command "$command" --show-trace
##
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