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improve julia language support #3494

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ericphanson wants to merge 8 commits into from
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improve julia language support #3494

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a7f8efa
improve julia support
ericphanson Jul 21, 2025
9583b19
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jul 21, 2025
0c54b47
make flake and mypy happier
ericphanson Jul 21, 2025
5501721
add
ericphanson Jul 21, 2025
ae6f19d
add test for julia version support
ericphanson Jul 21, 2025
f2837cf
add channel
ericphanson Jul 21, 2025
9a04b39
copy rust's pattern for conditional env
ericphanson Jul 21, 2025
1ba5581
restore comment
ericphanson Jul 21, 2025
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improve julia support
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@ericphanson
ericphanson committed Jul 21, 2025
commit a7f8efa2ae1164d5fdc06bc19c8cfa5f37bf962d
24 changes: 12 additions & 12 deletions pre_commit/languages/julia.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,41 +37,36 @@ def run_hook(

cmd = lang_base.hook_cmd(entry, args)
script = cmd[0] if is_local else prefix.path(cmd[0])
cmd = ('julia', script, *cmd[1:])
cmd = ('julia', '--startup-file=no', 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 (
patches = [
('JULIA_LOAD_PATH', target_dir),
# May be set, remove it to not interfer with LOAD_PATH
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ericphanson marked this conversation as resolved.
('JULIA_PROJECT', UNSET),
)

]
if version not in ("system", "default"):
patches.append(('JULIAUP_CHANNEL', version))

@asottile asottile Jul 21, 2025

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this isn't quite right. to properly support language_version pre-commit must install the language itself into the hook environment (and not outside of it such as in the juliaup managed directories)

@ericphanson ericphanson Jul 21, 2025

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hm, pre-commit wants an entire copy of julia installed into the hook environment directory? that's very unusual for julia, which uses content-addressed read-only files and packages to allow reuse across environments. It would also make pre-commit install much slower for julia hooks than it currently is.

return tuple(patches)

@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)
Expand Down Expand Up @@ -99,6 +94,11 @@ def install_environment(
shutil.copy(manifest_file, envdir)
break

# copy `src` files if they exist
src_dir = prefix.path("src")
if os.path.isdir(src_dir):
shutil.copytree(src_dir, os.path.join(envdir, 'src'))

# Julia code to instantiate the hook environment
julia_code = """
@assert length(ARGS) > 0
Expand Down Expand Up @@ -127,6 +127,6 @@ def install_environment(
end
"""
cmd_output_b(
'julia', '-e', julia_code, '--', envdir, *additional_dependencies,
'julia', '--startup-file=no', '-e', julia_code, '--', envdir, *additional_dependencies,
cwd=prefix.prefix_dir,
)