Add support for julia hooks

This patch adds 2nd class support for hooks using julia as the language.
pre-commit will install any dependencies defined in the hooks repo
`Project.toml` file, with support for `additional_dependencies` as well.
Julia doesn't (yet) have a way to install binaries/scripts so for julia
hooks the `entry` value is a (relative) path to a julia script within
the hooks repository. When executing a julia hook the (globally
installed) julia interpreter is prepended to the entry.

Example `.pre-commit-hooks.yaml`:

```yaml
- id: foo
  name: ...
  language: julia
  entry: bin/foo.jl --arg1
```

Example hooks repo: https://github.com/fredrikekre/runic-pre-commit/tree/fe/julia
Accompanying pre-commit.com PR: pre-commit/pre-commit.com#998

Fixes pre-commit#2689.

pre_commit/all_languages.py

@@ -10,6 +10,7 @@
 from pre_commit.languages import fail
 from pre_commit.languages import golang
 from pre_commit.languages import haskell
+from pre_commit.languages import julia
 from pre_commit.languages import lua
 from pre_commit.languages import node
 from pre_commit.languages import perl
@@ -33,6 +34,7 @@
     'fail': fail,
     'golang': golang,
     'haskell': haskell,
+    'julia': julia,
     'lua': lua,
     'node': node,
     'perl': perl,

pre_commit/languages/julia.py

@@ -0,0 +1,132 @@
+from __future__ import annotations
+
+import contextlib
+import os
+import shutil
+from collections.abc import Generator
+from collections.abc import Sequence
+
+from pre_commit import lang_base
+from pre_commit.envcontext import envcontext
+from pre_commit.envcontext import PatchesT
+from pre_commit.envcontext import UNSET
+from pre_commit.prefix import Prefix
+from pre_commit.util import cmd_output_b
+
+ENVIRONMENT_DIR = 'juliaenv'
+health_check = lang_base.basic_health_check
+get_default_version = lang_base.basic_get_default_version
+
+
+def run_hook(
+        prefix: Prefix,
+        entry: str,
+        args: Sequence[str],
+        file_args: Sequence[str],
+        *,
+        is_local: bool,
+        require_serial: bool,
+        color: bool,
+) -> tuple[int, bytes]:
+    # `entry` is a (hook-repo relative) file followed by (optional) args, e.g.
+    # `bin/id.jl` or `bin/hook.jl --arg1 --arg2` so we
+    # 1) shell parse it and join with args with hook_cmd
+    # 2) prepend the hooks prefix path to the first argument (the file), unless
+    #    it is a local script
+    # 3) prepend `julia` as the interpreter
+
+    cmd = lang_base.hook_cmd(entry, args)
+    script = cmd[0] if is_local else prefix.path(cmd[0])
+    cmd = ('julia', script, *cmd[1:])
+    return lang_base.run_xargs(
+        cmd,
+        file_args,
+        require_serial=require_serial,
+        color=color,
+    )
+
+
+def get_env_patch(target_dir: str, version: str) -> PatchesT:
+    return (
+        ('JULIA_LOAD_PATH', target_dir),
+        # May be set, remove it to not interfer with LOAD_PATH
+        ('JULIA_PROJECT', UNSET),
+    )
+
+
+@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 install_environment(
+        prefix: Prefix,
+        version: str,
+        additional_dependencies: Sequence[str],
+) -> None:
+    envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)
+    with in_env(prefix, version):
+        # TODO: Support language_version with juliaup similar to rust via
+        # rustup
+        # if version != 'system':
+        #     ...
+
+        # Copy Project.toml to hook env if it exist
+        os.makedirs(envdir, exist_ok=True)
+        project_names = ('JuliaProject.toml', 'Project.toml')
+        project_found = False
+        for project_name in project_names:
+            project_file = prefix.path(project_name)
+            if not os.path.isfile(project_file):
+                continue
+            shutil.copy(project_file, envdir)
+            project_found = True
+            break
+
+        # If no project file was found we create an empty one so that the
+        # package manager doesn't error
+        if not project_found:
+            open(os.path.join(envdir, 'Project.toml'), 'a').close()
+
+        # Copy Manifest.toml to hook env if it exists
+        manifest_names = ('JuliaManifest.toml', 'Manifest.toml')
+        for manifest_name in manifest_names:
+            manifest_file = prefix.path(manifest_name)
+            if not os.path.isfile(manifest_file):
+                continue
+            shutil.copy(manifest_file, envdir)
+            break
+
+        # Julia code to instantiate the hook environment
+        julia_code = """
+        @assert length(ARGS) > 0
+        hook_env = ARGS[1]
+        deps = join(ARGS[2:end], " ")
+
+        # We prepend @stdlib here so that we can load the package manager even
+        # though `get_env_patch` limits `JULIA_LOAD_PATH` to just the hook env.
+        pushfirst!(LOAD_PATH, "@stdlib")
+        using Pkg
+        popfirst!(LOAD_PATH)
+
+        # Instantiate the environment shipped with the hook repo. If we have
+        # additional dependencies we disable precompilation in this step to
+        # avoid double work.
+        precompile = isempty(deps) ? "1" : "0"
+        withenv("JULIA_PKG_PRECOMPILE_AUTO" => precompile) do
+            Pkg.instantiate()
+        end
+
+        # Add additional dependencies (with precompilation)
+        if !isempty(deps)
+            withenv("JULIA_PKG_PRECOMPILE_AUTO" => "1") do
+                Pkg.REPLMode.pkgstr("add " * deps)
+            end
+        end
+        """
+        cmd_output_b(
+            'julia', '-e', julia_code, '--', envdir, *additional_dependencies,
+            cwd=prefix.prefix_dir,
+        )

tests/languages/julia_test.py

@@ -0,0 +1,97 @@
+from __future__ import annotations
+
+from pre_commit.languages import julia
+from testing.language_helpers import run_language
+from testing.util import cwd
+
+
+def _make_hook(tmp_path, julia_code):
+    src_dir = tmp_path.joinpath('src')
+    src_dir.mkdir()
+    src_dir.joinpath('main.jl').write_text(julia_code)
+    tmp_path.joinpath('Project.toml').write_text(
+        '[deps]\n'
+        'Example = "7876af07-990d-54b4-ab0e-23690620f79a"\n',
+    )
+
+
+def test_julia_hook(tmp_path):
+    code = """
+    using Example
+    function main()
+        println("Hello, world!")
+    end
+    main()
+    """
+    _make_hook(tmp_path, code)
+    expected = (0, b'Hello, world!\n')
+    assert run_language(tmp_path, julia, 'src/main.jl') == expected
+
+
+def test_julia_hook_manifest(tmp_path):
+    code = """
+    using Example
+    println(pkgversion(Example))
+    """
+    _make_hook(tmp_path, code)
+
+    tmp_path.joinpath('Manifest.toml').write_text(
+        'manifest_format = "2.0"\n\n'
+        '[[deps.Example]]\n'
+        'git-tree-sha1 = "11820aa9c229fd3833d4bd69e5e75ef4e7273bf1"\n'
+        'uuid = "7876af07-990d-54b4-ab0e-23690620f79a"\n'
+        'version = "0.5.4"\n',
+    )
+    expected = (0, b'0.5.4\n')
+    assert run_language(tmp_path, julia, 'src/main.jl') == expected
+
+
+def test_julia_hook_args(tmp_path):
+    code = """
+    function main(argv)
+        foreach(println, argv)
+    end
+    main(ARGS)
+    """
+    _make_hook(tmp_path, code)
+    expected = (0, b'--arg1\n--arg2\n')
+    assert run_language(
+        tmp_path, julia, 'src/main.jl --arg1 --arg2',
+    ) == expected
+
+
+def test_julia_hook_additional_deps(tmp_path):
+    code = """
+    using TOML
+    function main()
+        project_file = Base.active_project()
+        dict = TOML.parsefile(project_file)
+        for (k, v) in dict["deps"]
+            println(k, " = ", v)
+        end
+    end
+    main()
+    """
+    _make_hook(tmp_path, code)
+    deps = ('TOML=fa267f1f-6049-4f14-aa54-33bafae1ed76',)
+    ret, out = run_language(tmp_path, julia, 'src/main.jl', deps=deps)
+    assert ret == 0
+    assert b'Example = 7876af07-990d-54b4-ab0e-23690620f79a' in out
+    assert b'TOML = fa267f1f-6049-4f14-aa54-33bafae1ed76' in out
+
+
+def test_julia_repo_local(tmp_path):
+    env_dir = tmp_path.joinpath('envdir')
+    env_dir.mkdir()
+    local_dir = tmp_path.joinpath('local')
+    local_dir.mkdir()
+    local_dir.joinpath('local.jl').write_text(
+        'using TOML; foreach(println, ARGS)',
+    )
+    with cwd(local_dir):
+        deps = ('TOML=fa267f1f-6049-4f14-aa54-33bafae1ed76',)
+        expected = (0, b'--local-arg1\n--local-arg2\n')
+        assert run_language(
+            env_dir, julia, 'local.jl --local-arg1 --local-arg2',
+            deps=deps, is_local=True,
+        ) == expected