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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 --json ${targets[@]})
langdeps=$(jq --raw-output '.[].langdeps | join(" ")' <<< $json)
sysdeps=$(jq --raw-output '.[].sysdeps | join(" ")' <<< $json)
exts=$(jq --raw-output '.[].namespace.ext' <<< $json | sort | uniq)
packageSet=$(jp --raw-output '.[].packageSet' <<< $json)
BILD="(import ${BIZ_ROOT:?}/Biz/Bild.nix {})"
for lib in ${sysdeps[@]}; do
flags+=(--packages "$BILD.private.nixpkgs.${lib}")
flags+=(--packages "$BILD.private.nixpkgs.pkg-config")
done
case $exts in
C)
flags+=(--packages "$BILD.private.nixpkgs.gcc")
command="bash"
;;
Hs)
if [ -z ${var+PORT} ]; then
echo "warn: repl: ghci does not support binding to a port"
fi
flags+=(--packages "$BILD.private.$packageSet (h: with h; [$langdeps])")
command=${CMD:-"ghci -i${BIZ_ROOT:?} -ghci-script ${BIZ_ROOT:?}/.ghci ${targets[@]}"}
;;
Scm)
for lib in ${langdeps[@]}; do
flags+=(--packages "$BILD.private.nixpkgs.guile-${lib}")
done
flags+=(--packages "$BILD.private.nixpkgs.guile")
command=${CMD:-"guile -L ${BIZ_ROOT:?} -C ${BIZ_ROOT:?}/_/int --r7rs --listen=${PORT:-37146}"}
;;
Lisp)
flags+=(--packages "$BILD.private.$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.private.nixpkgs.rustc")
command=bash
;;
*)
echo "unsupported targets: ${targets[@]}"
exit 1
;;
esac
##
nix-shell "${flags[@]}" --command "$command"
##
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