load("//bazel:common_settings.bzl", "string_flag")
exports_files(["PACE"])

#
# OS-CPU CONFIG SETTINGS
#

config_setting(
    name = "linux_aarch64",
    constraint_values = [
        "@platforms//os:linux",
        "@platforms//cpu:aarch64",
    ],
)

config_setting(
    name = "linux_x86_64",
    constraint_values = [
        "@platforms//os:linux",
        "@platforms//cpu:x86_64",
    ],
)

config_setting(
    name = "macos_aarch64",
    constraint_values = [
        "@platforms//os:macos",
        "@platforms//cpu:aarch64",
    ],
)

config_setting(
    name = "macos_x86_64",
    constraint_values = [
        "@platforms//os:macos",
        "@platforms//cpu:x86_64",
    ],
)

#
# CONFIGS DETAILING WHEN TO ENABLE CERTAIN FEATURES BY DEFAULT.
# CHANGES BEHAVIOR OF //bazel/common_settings.bzl:vere_library.
#

config_setting(
    name = "thinlto",
    constraint_values = [
        "@platforms//os:macos",
    ],
    values = {
        "compilation_mode": "opt"
    }
)

config_setting(
    name = "lto",
    constraint_values = [
        "@platforms//os:linux",
    ],
    values = {
        "compilation_mode": "opt"
    }
)

config_setting(
    name = "debug",
    values = {
        "compilation_mode": "dbg"
    }
)

#
# COMPILERS
#

# Version flag for clang.
string_flag(
    name = "clang_version",
    # macOS uses `clang-15.0.0` by default.
    build_setting_default = "15.0.0",
    visibility = ["//visibility:public"],
)

# Version flag for gcc.
string_flag(
    name = "gcc_version",
    # musl-cross-make uses `gcc-9.4.0` by default.
    build_setting_default = "9.4.0",
    visibility = ["//visibility:public"],
)

#
# PLATFORMS
#
# A platform takes one of two formats: `<compiler>-<os>-<cpu>` or `<os>-<cpu>`
# if the compiler is unspecified.

# Linux aarch64 platform with unspecified compiler.
platform(
    name = "linux-aarch64",
    constraint_values = [
        "@platforms//os:linux",
        "@platforms//cpu:aarch64",
    ],
)

# Linux x86_64 platform with unspecified compiler.
platform(
    name = "linux-x86_64",
    constraint_values = [
        "@platforms//os:linux",
        "@platforms//cpu:x86_64",
    ],
)

# Linux x86_64 platform with gcc.
platform(
    name = "gcc-linux-x86_64",
    constraint_values = [
        ":gcc",
        "@platforms//os:linux",
        "@platforms//cpu:x86_64",
    ],
)

platform(
    name = "macos-aarch64",
    constraint_values = [
        "@platforms//os:macos",
        "@platforms//cpu:aarch64",
    ],
)

platform(
    name = "clang-macos-aarch64",
    constraint_values = [
        ":clang",
        "@platforms//os:macos",
        "@platforms//cpu:aarch64",
    ],
)

platform(
    name = "macos-x86_64",
    constraint_values = [
        "@platforms//os:macos",
        "@platforms//cpu:x86_64",
    ],
)

platform(
    name = "clang-macos-x86_64",
    constraint_values = [
        ":clang",
        "@platforms//os:macos",
        "@platforms//cpu:x86_64",
    ],
)

# Produce the `U3_VERE_PACE` macro.
genrule(
    name = "pace_hdr",
    srcs = ["PACE"],
    outs = ["pace.h"],
    cmd = """
    echo '#ifndef URBIT_PACE_H' > $@
    echo '#define URBIT_PACE_H' >> $@
    printf '#define U3_VERE_PACE "%s"\n' $$(cat $< | tr -d '\n') >> $@
    echo '#endif' >> $@
    """,
    visibility = ["//:__subpackages__"],
)

genrule(
    name = "version_str",
    srcs = [
        # Bazel warns dependency checking directories is unsound, but there's no
        # apparent way around depending on .git if we want to run git commands.
        ".git",
        "PACE",
        "VERSION",
    ],
    outs = ["version"],
    cmd = """
    version_num=$$(cat $(execpath VERSION) | tr -d '\n')
    commit_sha=$$(git rev-parse --short HEAD)
    if [ $$(tr -d '\n' < $(execpath PACE)) == "live" ]; then
        version="$$version_num"
    else
        version="$$version_num-$$commit_sha"
    fi
    echo -n $$version > $@
    """,
    visibility = ["//:__subpackages__"],
)

# Produce the `URBIT_VERSION` macro.
genrule(
    name = "version_hdr",
    srcs = [":version_str"],
    outs = ["version.h"],
    cmd = """
    echo '#ifndef URBIT_VERSION_H' > $@
    echo '#define URBIT_VERSION_H' >> $@
    printf '#define URBIT_VERSION "%s"\n' $$(cat $< | tr -d '\n') >> $@
    echo '#endif' >> $@
    """,
    visibility = ["//:__subpackages__"],
)

alias(
    name = "urbit",
    actual = "//pkg/vere:urbit",
)