212 lines
7.1 KiB
Python
212 lines
7.1 KiB
Python
"""Rule for running JS/TS scripts with Bun in watch mode for development."""
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load("//internal:bun_command.bzl", "append_shell_flag", "append_shell_flag_files", "append_shell_flag_values", "append_shell_install_mode", "append_shell_raw_flags", "render_shell_array", "shell_quote")
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load("//internal:workspace.bzl", "create_bun_workspace_info", "render_workspace_setup", "workspace_runfiles")
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def _bun_dev_impl(ctx):
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toolchain = ctx.toolchains["//bun:toolchain_type"]
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bun_bin = toolchain.bun.bun_bin
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entry_point = ctx.file.entry_point
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workspace_info = create_bun_workspace_info(
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ctx,
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extra_files = ctx.files.data + ctx.files.restart_on + ctx.files.preload + ctx.files.env_files + [bun_bin],
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primary_file = entry_point,
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)
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restart_watch_paths = "\n".join([path.short_path for path in ctx.files.restart_on])
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launcher_lines = [render_shell_array("bun_args", ["--bun", "run"])]
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append_shell_install_mode(launcher_lines, "bun_args", ctx.attr.install_mode)
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append_shell_flag_files(launcher_lines, "bun_args", "--preload", ctx.files.preload)
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append_shell_flag_files(launcher_lines, "bun_args", "--env-file", ctx.files.env_files)
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append_shell_flag(launcher_lines, "bun_args", "--no-env-file", ctx.attr.no_env_file)
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append_shell_flag(launcher_lines, "bun_args", "--smol", ctx.attr.smol)
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append_shell_flag_values(launcher_lines, "bun_args", "--conditions", ctx.attr.conditions)
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append_shell_flag(launcher_lines, "bun_args", "--no-clear-screen", ctx.attr.no_clear_screen)
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append_shell_raw_flags(launcher_lines, "bun_args", ctx.attr.run_flags)
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launcher_lines.append('bun_args+=("${primary_source}")')
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for arg in ctx.attr.args:
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launcher_lines.append("bun_args+=(%s)" % shell_quote(arg))
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command = """
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__BUN_ARGS__
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watch_mode="__WATCH_MODE__"
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if [[ "${watch_mode}" == "hot" ]]; then
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bun_args+=("--hot")
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else
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bun_args+=("--watch")
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fi
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if [[ __RESTART_COUNT__ -eq 0 ]]; then
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trap cleanup_runtime_workspace EXIT
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cd "${runtime_exec_dir}"
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exec "${bun_bin}" "${bun_args[@]}" "$@"
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fi
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readarray -t restart_paths <<'EOF_RESTART_PATHS'
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__RESTART_PATHS__
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EOF_RESTART_PATHS
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file_mtime() {
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local path="$1"
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if stat -f '%m' "${path}" >/dev/null 2>&1; then
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stat -f '%m' "${path}"
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return 0
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fi
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stat -c '%Y' "${path}"
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}
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declare -A mtimes
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for rel in "${restart_paths[@]}"; do
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path="${runfiles_dir}/_main/${rel}"
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if [[ -e "${path}" ]]; then
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mtimes["${rel}"]="$(file_mtime "${path}")"
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else
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mtimes["${rel}"]="missing"
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fi
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done
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child_pid=""
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restart_child() {
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if [[ -n "${child_pid}" ]] && kill -0 "${child_pid}" 2>/dev/null; then
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kill "${child_pid}"
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wait "${child_pid}" || true
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fi
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(
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cd "${runtime_exec_dir}"
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exec "${bun_bin}" "${bun_args[@]}" "$@"
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) &
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child_pid=$!
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}
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cleanup() {
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if [[ -n "${child_pid}" ]] && kill -0 "${child_pid}" 2>/dev/null; then
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kill "${child_pid}"
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wait "${child_pid}" || true
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fi
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cleanup_runtime_workspace
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}
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trap cleanup EXIT INT TERM
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restart_child "$@"
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while true; do
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sleep 1
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changed=0
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for rel in "${restart_paths[@]}"; do
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path="${runfiles_dir}/_main/${rel}"
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if [[ -e "${path}" ]]; then
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current="$(file_mtime "${path}")"
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else
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current="missing"
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fi
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if [[ "${current}" != "${mtimes[${rel}]}" ]]; then
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mtimes["${rel}"]="${current}"
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changed=1
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fi
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done
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if [[ "${changed}" -eq 1 ]]; then
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restart_child "$@"
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fi
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done
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""".replace("__WATCH_MODE__", ctx.attr.watch_mode).replace(
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"__RESTART_COUNT__",
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str(len(ctx.files.restart_on)),
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).replace(
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"__RESTART_PATHS__",
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restart_watch_paths,
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).replace(
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"__BUN_ARGS__",
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"\n".join(launcher_lines),
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)
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launcher = ctx.actions.declare_file(ctx.label.name)
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ctx.actions.write(
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output = launcher,
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is_executable = True,
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content = render_workspace_setup(
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bun_short_path = bun_bin.short_path,
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primary_source_short_path = entry_point.short_path,
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working_dir_mode = ctx.attr.working_dir,
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) + command,
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)
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return [
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workspace_info,
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DefaultInfo(
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executable = launcher,
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runfiles = workspace_runfiles(ctx, workspace_info, direct_files = [launcher]),
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),
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]
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bun_dev = rule(
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implementation = _bun_dev_impl,
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doc = """Runs a JS/TS entry point in Bun development watch mode.
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This rule is intended for local dev loops (`bazel run`) and supports Bun
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watch/HMR plus optional full restarts on selected file changes.
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""",
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attrs = {
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"entry_point": attr.label(
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mandatory = True,
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allow_single_file = [".js", ".ts", ".jsx", ".tsx", ".mjs", ".cjs"],
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doc = "Path to the main JS/TS file to execute in dev mode.",
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),
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"watch_mode": attr.string(
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default = "watch",
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values = ["watch", "hot"],
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doc = "Bun live-reload mode: `watch` (default) or `hot`.",
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),
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"restart_on": attr.label_list(
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allow_files = True,
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doc = "Files that trigger a full Bun process restart when they change.",
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),
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"node_modules": attr.label(
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doc = "Optional label providing package files from a `node_modules` tree, typically produced by `bun_install`, in runfiles.",
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),
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"data": attr.label_list(
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allow_files = True,
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doc = "Additional runtime files required by the dev process.",
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),
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"preload": attr.label_list(
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allow_files = True,
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doc = "Modules to preload with `--preload` before running the entry point.",
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),
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"env_files": attr.label_list(
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allow_files = True,
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doc = "Additional environment files loaded with `--env-file`.",
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),
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"no_env_file": attr.bool(
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default = False,
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doc = "If true, disables Bun's automatic `.env` loading.",
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),
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"smol": attr.bool(
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default = False,
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doc = "If true, enables Bun's lower-memory runtime mode.",
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),
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"conditions": attr.string_list(
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doc = "Custom package resolve conditions passed to Bun.",
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),
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"install_mode": attr.string(
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default = "disable",
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values = ["disable", "auto", "fallback", "force"],
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doc = "Whether Bun may auto-install missing packages in dev mode.",
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),
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"no_clear_screen": attr.bool(
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default = False,
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doc = "If true, disables terminal clearing on Bun reloads.",
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),
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"run_flags": attr.string_list(
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doc = "Additional raw flags forwarded to `bun run` before the entry point.",
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),
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"working_dir": attr.string(
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default = "workspace",
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values = ["workspace", "entry_point"],
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doc = "Working directory at runtime: `workspace` root or nearest `entry_point` ancestor containing `.env`/`package.json`.",
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),
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},
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executable = True,
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toolchains = ["//bun:toolchain_type"],
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)
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