load("@bazel_skylib//rules:write_file.bzl", "write_file")
load("@rules_shell//shell:sh_binary.bzl", "sh_binary")
load("//misc/bazel:rust.bzl", "codeql_rust_binary")
load("//misc/bazel/3rdparty/tree_sitter_extractors_deps:defs.bzl", "aliases", "all_crate_deps", "crate_deps")

(ra_ap_syntax_label,) = crate_deps(
    ["ra_ap_syntax"],
    "rust/extractor",
)

ra_ap_syntax_workspace, _, _ = str(ra_ap_syntax_label).partition("//")

alias(
    name = "ungram",
    actual = "%s//:rust.ungram" % ra_ap_syntax_workspace,
    visibility = ["//rust/codegen:__pkg__"],
)

_codegen = [
    "grammar.rs",
    "grammar/ast_src.rs",
]

_codegen_srcs = ["@rust-analyzer-src//:xtask/src/codegen/%s" % f for f in _codegen]

_codegen_outs = ["src/codegen/%s" % f for f in _codegen]

genrule(
    name = "codegen",
    srcs = _codegen_srcs,
    outs = _codegen_outs,
    cmd = "\n".join(
        ["mkdir -p $(RULEDIR)/src/codegen/grammar"] +
        [
            "cp $(location %s) $(RULEDIR)/%s" % item
            for item in zip(_codegen_srcs, _codegen_outs)
        ],
    ),
)

codeql_rust_binary(
    name = "ast-generator",
    srcs = glob(
        ["src/**/*.rs"],
        exclude = ["src/codegen/**"],
    ) + [":codegen"],
    aliases = aliases(),
    args = ["$(rlocationpath :ungram)"],
    compile_data = glob(["src/templates/*.mustache"]),
    data = [":ungram"],
    proc_macro_deps = all_crate_deps(
        proc_macro = True,
    ),
    visibility = ["//rust:__subpackages__"],
    deps = all_crate_deps(
        normal = True,
    ),
)

write_file(
    name = "update",
    out = "update.sh",
    content = [
        "#!/bin/bash",
        ". misc/bazel/runfiles.sh",
        'DST_DIR="$(dirname "$(rlocation "$1")")"',
        'mkdir -p "$DST_DIR/src/codegen/grammar"',
    ] + [
        # using cat instead of cp to honor default umask
        # (also, macOS does not support `cp --no-preserve=mode`)
        'cat "$(rlocation "$%s")" > "$DST_DIR/%s"' % item
        for item in enumerate(_codegen_outs, 2)
    ],
    is_executable = True,
)

sh_binary(
    name = "inject-sources",
    srcs = [":update"],
    args = ["$(rlocationpath Cargo.toml)"] + ["$(rlocationpath %s)" % f for f in _codegen_outs],
    data = ["Cargo.toml"] + _codegen_outs,
    deps = ["//misc/bazel:sh_runfiles"],
)

exports_files(["Cargo.toml"])