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from __future__ import annotations

import contextlib

import functools

import os.path

import shutil

import sys

import tempfile

import urllib.request

from collections.abc import Generator

from collections.abc import Sequence

import pre_commit.constants as C

from pre_commit import lang_base

from pre_commit import parse_shebang

from pre_commit.envcontext import envcontext

from pre_commit.envcontext import PatchesT

from pre_commit.envcontext import Var

from pre_commit.prefix import Prefix

from pre_commit.util import cmd_output_b

from pre_commit.util import make_executable

from pre_commit.util import win_exe

ENVIRONMENT_DIR = 'rustenv'

health_check = lang_base.basic_health_check

run_hook = lang_base.basic_run_hook

@functools.lru_cache(maxsize=1)

def get_default_version() -> str:

# If rust is already installed, we can save a bunch of setup time by

# using the installed version.

# Just detecting the executable does not suffice, because if rustup is

# installed but no toolchain is available, then `cargo` exists but

# cannot be used without installing a toolchain first.

if cmd_output_b('cargo', '--version', check=False, cwd='/')[0] == 0:

return 'system'

else:

return C.DEFAULT

def _rust_toolchain(language_version: str) -> str:

"""Transform the language version into a rust toolchain version."""

if language_version == C.DEFAULT:

return 'stable'

else:

return language_version

def get_env_patch(target_dir: str, version: str) -> PatchesT:

return (

('PATH', (os.path.join(target_dir, 'bin'), os.pathsep, Var('PATH'))),

# Only set RUSTUP_TOOLCHAIN if we don't want use the system's default

# toolchain

(('RUSTUP_TOOLCHAIN', _rust_toolchain(version)),)

if version != 'system' else ()

)

@contextlib.contextmanager

def in_env(prefix: Prefix, version: str) -> Generator[None]:

envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)

with envcontext(get_env_patch(envdir, version)):

yield

def _add_dependencies(

prefix: Prefix,

additional_dependencies: set[str],

) -> None:

crates = []

for dep in additional_dependencies:

name, _, spec = dep.partition(':')

crate = f'{name}@{spec or "*"}'

crates.append(crate)

lang_base.setup_cmd(prefix, ('cargo', 'add', *crates))

def install_rust_with_toolchain(toolchain: str, envdir: str) -> None:

with tempfile.TemporaryDirectory() as rustup_dir:

with envcontext((('CARGO_HOME', envdir), ('RUSTUP_HOME', rustup_dir))):

# acquire `rustup` if not present

if parse_shebang.find_executable('rustup') is None:

# We did not detect rustup and need to download it first.

if sys.platform == 'win32': # pragma: win32 cover

url = 'https://win.rustup.rs/x86_64'

else: # pragma: win32 no cover

url = 'https://sh.rustup.rs'

resp = urllib.request.urlopen(url)

rustup_init = os.path.join(rustup_dir, win_exe('rustup-init'))

with open(rustup_init, 'wb') as f:

shutil.copyfileobj(resp, f)

make_executable(rustup_init)

# install rustup into `$CARGO_HOME/bin`

cmd_output_b(

rustup_init, '-y', '--quiet', '--no-modify-path',

'--default-toolchain', 'none',

)

cmd_output_b(

'rustup', 'toolchain', 'install', '--no-self-update',

toolchain,

)

def install_environment(

prefix: Prefix,

version: str,

additional_dependencies: Sequence[str],

) -> None:

envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)

# There are two cases where we might want to specify more dependencies:

# as dependencies for the library being built, and as binary packages

# to be `cargo install`'d.

# Unlike e.g. Python, if we just `cargo install` a library, it won't be

# used for compilation. And if we add a crate providing a binary to the

# `Cargo.toml`, the binary won't be built.

# Because of this, we allow specifying "cli" dependencies by prefixing

# with 'cli:'.

cli_deps = {

dep for dep in additional_dependencies if dep.startswith('cli:')

}

lib_deps = set(additional_dependencies) - cli_deps

packages_to_install: set[tuple[str, ...]] = {('--path', '.')}

for cli_dep in cli_deps:

cli_dep = cli_dep.removeprefix('cli:')

package, _, crate_version = cli_dep.partition(':')

if crate_version != '':

packages_to_install.add((package, '--version', crate_version))

else:

packages_to_install.add((package,))

with contextlib.ExitStack() as ctx:

ctx.enter_context(in_env(prefix, version))

if version != 'system':

install_rust_with_toolchain(_rust_toolchain(version), envdir)

tmpdir = ctx.enter_context(tempfile.TemporaryDirectory())

ctx.enter_context(envcontext((('RUSTUP_HOME', tmpdir),)))

if len(lib_deps) > 0:

_add_dependencies(prefix, lib_deps)

for args in packages_to_install:

cmd_output_b(

'cargo', 'install', '--bins', '--root', envdir, *args,

cwd=prefix.prefix_dir,

)

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