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#!/usr/bin/env python |
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# -*- coding: utf-8 -*- |
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""" |
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cookiecutter.hooks |
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------------------ |
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Functions for discovering and executing various cookiecutter hooks. |
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""" |
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import io |
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import logging |
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import os |
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import subprocess |
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import sys |
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import tempfile |
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import json |
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import re |
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import errno |
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from jinja2 import Template |
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from cookiecutter import utils |
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from .exceptions import FailedHookException |
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_HOOKS = [ |
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'pre_gen_project', |
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'post_gen_project', |
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# TODO: other hooks should be listed here |
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] |
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EXIT_SUCCESS = 0 |
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def find_hooks(): |
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""" |
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Must be called with the project template as the current working directory. |
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Returns a dict of all hook scripts provided. |
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Dict's key will be the hook/script's name, without extension, while |
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values will be the absolute path to the script. |
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Missing scripts will not be included in the returned dict. |
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""" |
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hooks_dir = 'hooks' |
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r = {} |
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logging.debug('hooks_dir is {0}'.format(hooks_dir)) |
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if not os.path.isdir(hooks_dir): |
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logging.debug('No hooks/ dir in template_dir') |
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return r |
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for f in os.listdir(hooks_dir): |
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basename = os.path.splitext(os.path.basename(f))[0] |
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if basename in _HOOKS: |
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r[basename] = os.path.abspath(os.path.join(hooks_dir, f)) |
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return r |
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def run_script_with_context(script_path, cwd, context): |
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""" |
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Executes a script either after rendering with it Jinja or in place without |
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template rendering. |
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:param script_path: Absolute path to the script to run. |
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:param cwd: The directory to run the script from. |
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:param context: Cookiecutter project template context. |
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""" |
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if '_run_hook_in_place' in context and context['_run_hook_in_place']: |
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script = script_path |
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else: |
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script = __create_renderable_hook(script_path, context) |
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try: |
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result = __do_run_script(script, cwd, json.dumps(context).encode()) |
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json_search = re.findall('(\{.*\})', result[0].decode()) |
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return json.loads(json_search[-1]) if json_search else context |
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except ValueError: |
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return context |
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def run_hook(hook_name, project_dir, context): |
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""" |
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Try to find and execute a hook from the specified project directory. |
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:param hook_name: The hook to execute. |
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:param project_dir: The directory to execute the script from. |
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:param context: Cookiecutter project context. |
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""" |
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script = find_hooks().get(hook_name) |
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if script is None: |
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logging.debug('No hooks found') |
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return context |
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return run_script_with_context(script, project_dir, context) |
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def __create_renderable_hook(script_path, context): |
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""" |
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Create a renderable hook by copying the real hook and applying the template |
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:param script_path: Absolute path to the base hook. |
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:param context: Cookiecutter project template context. |
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""" |
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_, extension = os.path.splitext(script_path) |
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contents = io.open(script_path, 'r', encoding='utf-8').read() |
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with tempfile.NamedTemporaryFile( |
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delete=False, |
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mode='wb', |
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suffix=extension |
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) as temp: |
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output = Template(contents).render(**context) |
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temp.write(output.encode('utf-8')) |
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return temp.name |
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def __get_script_command(script_path): |
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""" |
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Get the executable command of a given script |
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:param script_path: Absolute path to the script to run. |
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""" |
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if script_path.endswith('.py'): |
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script_command = [sys.executable, script_path] |
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else: |
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script_command = [script_path] |
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utils.make_executable(script_path) |
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return script_command |
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def __do_run_script(script_path, cwd, serialized_context): |
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""" |
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Executes a script wrinting the given serialized context to its standard |
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input stream. |
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:param script_path: Absolute path to the script to run. |
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:param cwd: The directory to run the script from. |
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:param serialized_context: Serialized Cookiecutter project template |
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context. |
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""" |
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result = (serialized_context, b'') |
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run_thru_shell = sys.platform.startswith('win') |
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proc = subprocess.Popen( |
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__get_script_command(script_path), |
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shell=run_thru_shell, |
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cwd=cwd, |
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stdin=subprocess.PIPE, |
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stdout=subprocess.PIPE, |
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stderr=subprocess.PIPE |
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) |
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try: |
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result = proc.communicate(serialized_context) |
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except OSError as e: |
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if e.errno == errno.EINVAL and run_thru_shell: |
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logging.warn( |
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'Popen.communicate failed certainly ' + |
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'because of the issue #19612' |
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) |
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pass |
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else: |
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raise e |
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exit_status = proc.wait() |
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if exit_status != EXIT_SUCCESS: |
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raise FailedHookException( |
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"Hook script failed (exit status: %d)" % exit_status) |
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return result |
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audreyr /
cookiecutter
