From 904de577261e7024373e7a42fd763184764238f9 Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Tue, 10 Oct 2023 13:15:59 -0400
Subject: Don't swallow namespace-parsing errors

Previously, if there was a problem with the inputs and bild failed to
determine the namespace, 'fromPath' would return 'Nothing' and then
'catMaybes' would drop the error-causing input altogether. In the one
time that I had a bad input, this made debugging incredibly difficult.
It's always a bad idea to swallow errors silently, so instead lets just
kill the program if we have bad inputs.
---
 Biz/Ide/repl.bash | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100755 Biz/Ide/repl.bash

(limited to 'Biz/Ide/repl.bash')

diff --git a/Biz/Ide/repl.bash b/Biz/Ide/repl.bash
new file mode 100755
index 0000000..b10f0f0
--- /dev/null
+++ b/Biz/Ide/repl.bash
@@ -0,0 +1,87 @@
+#!/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(" ")' <<< $json)
+  rundeps=$(jq --raw-output '.[].rundeps | join(" ")' <<< $json)
+  exts=$(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 {})"
+  for lib in ${sysdeps[@]}
+  do
+    flags+=(--packages "$BILD.pkgs.${lib}")
+    flags+=(--packages "$BILD.pkgs.pkg-config")
+  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.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 "$BILD.bild.$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.nixpkgs.rustc")
+      command=bash
+      ;;
+    Py)
+      langdeps="$langdeps mypy"
+      flags+=(--packages ruff)
+      flags+=(--packages "$BILD.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"
+##
-- 
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