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Default to language_version: system if node and npm are installed

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This commit is contained in:
Anthony Sottile 2020-04-07 18:57:58 -07:00
parent 0a8ba31b9b
commit 0f528544b5
4 changed files with 81 additions and 11 deletions
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16
pre_commit/languages/node.py
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@ -1,4 +1,5 @@
import contextlib
import functools
import os
import sys
from typing import Generator
@ -6,6 +7,7 @@ from typing import Sequence
from typing import Tuple
import pre_commit.constants as C
from pre_commit import parse_shebang
from pre_commit.envcontext import envcontext
from pre_commit.envcontext import PatchesT
from pre_commit.envcontext import Var
@ -18,10 +20,22 @@ from pre_commit.util import cmd_output
from pre_commit.util import cmd_output_b
ENVIRONMENT_DIR = 'node_env'
get_default_version = helpers.basic_get_default_version
healthy = helpers.basic_healthy
@functools.lru_cache(maxsize=1)
def get_default_version() -> str:
# nodeenv does not yet support `-n system` on windows
if sys.platform == 'win32':
return C.DEFAULT
# if node is already installed, we can save a bunch of setup time by
# using the installed version
elif all(parse_shebang.find_executable(exe) for exe in ('node', 'npm')):
return 'system'
else:
return C.DEFAULT
def _envdir(prefix: Prefix, version: str) -> str:
directory = helpers.environment_dir(ENVIRONMENT_DIR, version)
return prefix.path(directory)