dotfasm

#!/bin/bash
set -euo pipefail

IMAGE="${DOTFASM_IMAGE:-plojure-fasm-amd64:latest}"

usage() {
  cat <<'USAGE'
Usage:
  ./dotfasm <file.asm> [output]
  ./dotfasm run <file.asm> [output]
  ./dotfasm shell
USAGE
}

ensure_image() {
  if docker image inspect "$IMAGE" >/dev/null 2>&1; then
    return
  fi

  echo "[dotfasm] Building local image $IMAGE (one-time setup)..."
  docker rm -f plojure-fasm-bootstrap >/dev/null 2>&1 || true
  docker run --name plojure-fasm-bootstrap --platform linux/amd64 debian:bookworm-slim \
    bash -lc 'set -e; apt-get update >/dev/null; DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends fasm gcc libc6-dev python3 make bash ca-certificates >/dev/null'
  docker commit plojure-fasm-bootstrap "$IMAGE" >/dev/null
  docker rm -f plojure-fasm-bootstrap >/dev/null
}

if [[ $# -lt 1 ]]; then
  usage
  exit 1
fi

REPO_ROOT="$(git -C "$(pwd)" rev-parse --show-toplevel 2>/dev/null || true)"
if [[ -z "${REPO_ROOT}" ]]; then
  echo "[dotfasm] Run from inside the repo."
  exit 1
fi

WORKDIR="$(pwd)"
if [[ "$WORKDIR" == "$REPO_ROOT" ]]; then
  CONTAINER_WD="/workspace"
else
  CONTAINER_WD="/workspace/${WORKDIR#"$REPO_ROOT"/}"
fi

MODE="compile"
ASM=""
OUT=""

case "${1}" in
  run)
    MODE="run"
    ASM="${2:-}"
    OUT="${3:-}"
    ;;
  shell)
    ensure_image
    exec docker run --rm -it --platform linux/amd64 \
      -v "$REPO_ROOT:/workspace" \
      -w "$CONTAINER_WD" \
      "$IMAGE" bash
    ;;
  -h|--help|help)
    usage
    exit 0
    ;;
  *)
    ASM="$1"
    OUT="${2:-}"
    ;;
esac

if [[ -z "$ASM" ]]; then
  usage
  exit 1
fi

if [[ ! -f "$ASM" ]]; then
  echo "[dotfasm] File not found: $ASM"
  exit 1
fi

if [[ -z "$OUT" ]]; then
  OUT="${ASM%.asm}"
fi

ensure_image

if [[ "$MODE" == "run" ]]; then
  CMD="set -e; fasm '$ASM' '$OUT'; chmod +x '$OUT'; ./'$OUT'"
else
  CMD="set -e; fasm '$ASM' '$OUT'"
fi

exec docker run --rm --platform linux/amd64 \
  -v "$REPO_ROOT:/workspace" \
  -w "$CONTAINER_WD" \
  "$IMAGE" \
  bash -lc "$CMD"