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# -*- coding: utf-8 -*- |
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"""Functions for generating a project from a project template.""" |
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from __future__ import unicode_literals |
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import fnmatch |
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import io |
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import json |
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import logging |
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import os |
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import shutil |
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from collections import OrderedDict |
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from binaryornot.check import is_binary |
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from jinja2 import FileSystemLoader |
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from jinja2.exceptions import TemplateSyntaxError, UndefinedError |
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from .environment import StrictEnvironment |
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from .exceptions import ( |
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NonTemplatedInputDirException, |
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ContextDecodingException, |
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FailedHookException, |
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OutputDirExistsException, |
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UndefinedVariableInTemplate |
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) |
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from .find import find_template |
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from .hooks import run_hook |
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from .utils import make_sure_path_exists, work_in, rmtree |
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logger = logging.getLogger(__name__) |
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def is_copy_only_path(path, context): |
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"""Check whether the given `path` should only be copied and not rendered. |
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Returns True if `path` matches a pattern in the given `context` dict, |
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otherwise False. |
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:param path: A file-system path referring to a file or dir that |
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should be rendered or just copied. |
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:param context: cookiecutter context. |
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""" |
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try: |
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for dont_render in context['cookiecutter']['_copy_without_render']: |
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if fnmatch.fnmatch(path, dont_render): |
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return True |
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except KeyError: |
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return False |
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return False |
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def apply_overwrites_to_context(context, overwrite_context): |
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"""Modify the given context in place based on the overwrite_context.""" |
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for variable, overwrite in overwrite_context.items(): |
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if variable not in context: |
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# Do not include variables which are not used in the template |
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continue |
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context_value = context[variable] |
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if isinstance(context_value, list): |
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# We are dealing with a choice variable |
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if overwrite in context_value: |
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# This overwrite is actually valid for the given context |
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# Let's set it as default (by definition first item in list) |
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# see ``cookiecutter.prompt.prompt_choice_for_config`` |
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context_value.remove(overwrite) |
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context_value.insert(0, overwrite) |
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else: |
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# Simply overwrite the value for this variable |
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context[variable] = overwrite |
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def generate_context(context_file='cookiecutter.json', default_context=None, |
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extra_context=None): |
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"""Generate the context for a Cookiecutter project template. |
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Loads the JSON file as a Python object, with key being the JSON filename. |
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:param context_file: JSON file containing key/value pairs for populating |
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the cookiecutter's variables. |
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:param default_context: Dictionary containing config to take into account. |
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:param extra_context: Dictionary containing configuration overrides |
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""" |
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context = {} |
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try: |
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with open(context_file) as file_handle: |
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obj = json.load(file_handle, object_pairs_hook=OrderedDict) |
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except ValueError as e: |
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# JSON decoding error. Let's throw a new exception that is more |
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# friendly for the developer or user. |
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full_fpath = os.path.abspath(context_file) |
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json_exc_message = str(e) |
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our_exc_message = ( |
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'JSON decoding error while loading "{0}". Decoding' |
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' error details: "{1}"'.format(full_fpath, json_exc_message)) |
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raise ContextDecodingException(our_exc_message) |
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# Add the Python object to the context dictionary |
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file_name = os.path.split(context_file)[1] |
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file_stem = file_name.split('.')[0] |
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context[file_stem] = obj |
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# Overwrite context variable defaults with the default context from the |
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# user's global config, if available |
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if default_context: |
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apply_overwrites_to_context(obj, default_context) |
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if extra_context: |
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apply_overwrites_to_context(obj, extra_context) |
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logger.debug('Context generated is {}'.format(context)) |
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return context |
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def generate_file(project_dir, infile, context, env): |
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"""Render filename of infile as name of outfile, handle infile correctly. |
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Dealing with infile appropriately: |
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a. If infile is a binary file, copy it over without rendering. |
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b. If infile is a text file, render its contents and write the |
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rendered infile to outfile. |
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Precondition: |
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When calling `generate_file()`, the root template dir must be the |
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current working directory. Using `utils.work_in()` is the recommended |
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way to perform this directory change. |
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:param project_dir: Absolute path to the resulting generated project. |
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:param infile: Input file to generate the file from. Relative to the root |
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template dir. |
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:param context: Dict for populating the cookiecutter's variables. |
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:param env: Jinja2 template execution environment. |
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""" |
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logger.debug('Processing file {}'.format(infile)) |
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# Render the path to the output file (not including the root project dir) |
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outfile_tmpl = env.from_string(infile) |
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outfile = os.path.join(project_dir, outfile_tmpl.render(**context)) |
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file_name_is_empty = os.path.isdir(outfile) |
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if file_name_is_empty: |
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logger.debug('The resulting file name is empty: {0}'.format(outfile)) |
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return |
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logger.debug('Created file at {0}'.format(outfile)) |
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# Just copy over binary files. Don't render. |
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logger.debug("Check {} to see if it's a binary".format(infile)) |
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if is_binary(infile): |
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logger.debug( |
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'Copying binary {} to {} without rendering' |
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''.format(infile, outfile) |
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) |
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shutil.copyfile(infile, outfile) |
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else: |
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# Force fwd slashes on Windows for get_template |
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# This is a by-design Jinja issue |
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infile_fwd_slashes = infile.replace(os.path.sep, '/') |
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# Render the file |
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try: |
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tmpl = env.get_template(infile_fwd_slashes) |
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except TemplateSyntaxError as exception: |
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# Disable translated so that printed exception contains verbose |
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# information about syntax error location |
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exception.translated = False |
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raise |
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rendered_file = tmpl.render(**context) |
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logger.debug('Writing contents to file {}'.format(outfile)) |
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with io.open(outfile, 'w', encoding='utf-8') as fh: |
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fh.write(rendered_file) |
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# Apply file permissions to output file |
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shutil.copymode(infile, outfile) |
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def render_and_create_dir(dirname, context, output_dir, environment, |
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overwrite_if_exists=False): |
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"""Render name of a directory, create the directory, return its path.""" |
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name_tmpl = environment.from_string(dirname) |
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rendered_dirname = name_tmpl.render(**context) |
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dir_to_create = os.path.normpath( |
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os.path.join(output_dir, rendered_dirname) |
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) |
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logger.debug('Rendered dir {} must exist in output_dir {}'.format( |
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dir_to_create, |
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output_dir |
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)) |
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output_dir_exists = os.path.exists(dir_to_create) |
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if output_dir_exists: |
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if overwrite_if_exists: |
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logger.debug( |
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'Output directory {} already exists,' |
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'overwriting it'.format(dir_to_create) |
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) |
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else: |
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msg = 'Error: "{}" directory already exists'.format(dir_to_create) |
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raise OutputDirExistsException(msg) |
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else: |
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make_sure_path_exists(dir_to_create) |
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return dir_to_create, not output_dir_exists |
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def ensure_dir_is_templated(dirname): |
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"""Ensure that dirname is a templated directory name.""" |
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if '{{' in dirname and '}}' in dirname: |
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return True |
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else: |
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raise NonTemplatedInputDirException |
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def _run_hook_from_repo_dir(repo_dir, hook_name, project_dir, context, |
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delete_project_on_failure): |
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"""Run hook from repo directory, clean project directory if hook fails. |
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:param repo_dir: Project template input 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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:param delete_project_on_failure: Delete the project directory on hook |
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failure? |
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""" |
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with work_in(repo_dir): |
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try: |
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run_hook(hook_name, project_dir, context) |
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except FailedHookException: |
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if delete_project_on_failure: |
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rmtree(project_dir) |
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logger.error( |
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"Stopping generation because {} hook " |
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"script didn't exit successfully".format(hook_name) |
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) |
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raise |
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def generate_files(repo_dir, context=None, output_dir='.', |
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overwrite_if_exists=False): |
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"""Render the templates and saves them to files. |
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:param repo_dir: Project template input directory. |
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:param context: Dict for populating the template's variables. |
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:param output_dir: Where to output the generated project dir into. |
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:param overwrite_if_exists: Overwrite the contents of the output directory |
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if it exists. |
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""" |
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template_dir = find_template(repo_dir) |
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logger.debug('Generating project from {}...'.format(template_dir)) |
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context = context or {} |
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unrendered_dir = os.path.split(template_dir)[1] |
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ensure_dir_is_templated(unrendered_dir) |
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env = StrictEnvironment( |
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context=context, |
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keep_trailing_newline=True, |
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) |
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try: |
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project_dir, output_directory_created = render_and_create_dir( |
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unrendered_dir, |
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context, |
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output_dir, |
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env, |
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overwrite_if_exists |
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) |
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except UndefinedError as err: |
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msg = "Unable to create project directory '{}'".format(unrendered_dir) |
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raise UndefinedVariableInTemplate(msg, err, context) |
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# We want the Jinja path and the OS paths to match. Consequently, we'll: |
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# + CD to the template folder |
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# + Set Jinja's path to '.' |
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# |
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# In order to build our files to the correct folder(s), we'll use an |
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# absolute path for the target folder (project_dir) |
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project_dir = os.path.abspath(project_dir) |
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logger.debug('Project directory is {}'.format(project_dir)) |
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# if we created the output directory, then it's ok to remove it |
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# if rendering fails |
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delete_project_on_failure = output_directory_created |
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_run_hook_from_repo_dir( |
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repo_dir, |
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'pre_gen_project', |
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project_dir, |
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context, |
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delete_project_on_failure |
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) |
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with work_in(template_dir): |
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env.loader = FileSystemLoader('.') |
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for root, dirs, files in os.walk('.'): |
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# We must separate the two types of dirs into different lists. |
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# The reason is that we don't want ``os.walk`` to go through the |
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# unrendered directories, since they will just be copied. |
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copy_dirs = [] |
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render_dirs = [] |
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for d in dirs: |
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d_ = os.path.normpath(os.path.join(root, d)) |
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# We check the full path, because that's how it can be |
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# specified in the ``_copy_without_render`` setting, but |
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# we store just the dir name |
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if is_copy_only_path(d_, context): |
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copy_dirs.append(d) |
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else: |
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render_dirs.append(d) |
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for copy_dir in copy_dirs: |
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indir = os.path.normpath(os.path.join(root, copy_dir)) |
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outdir = os.path.normpath(os.path.join(project_dir, indir)) |
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logger.debug( |
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'Copying dir {} to {} without rendering' |
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''.format(indir, outdir) |
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) |
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shutil.copytree(indir, outdir) |
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# We mutate ``dirs``, because we only want to go through these dirs |
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# recursively |
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dirs[:] = render_dirs |
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for d in dirs: |
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unrendered_dir = os.path.join(project_dir, root, d) |
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try: |
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render_and_create_dir( |
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unrendered_dir, |
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context, |
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output_dir, |
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env, |
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overwrite_if_exists |
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) |
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except UndefinedError as err: |
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if delete_project_on_failure: |
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rmtree(project_dir) |
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_dir = os.path.relpath(unrendered_dir, output_dir) |
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msg = "Unable to create directory '{}'".format(_dir) |
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raise UndefinedVariableInTemplate(msg, err, context) |
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for f in files: |
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infile = os.path.normpath(os.path.join(root, f)) |
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if is_copy_only_path(infile, context): |
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outfile_tmpl = env.from_string(infile) |
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outfile_rendered = outfile_tmpl.render(**context) |
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outfile = os.path.join(project_dir, outfile_rendered) |
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logger.debug( |
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|
|
'Copying file {} to {} without rendering' |
358
|
|
|
''.format(infile, outfile) |
359
|
|
|
) |
360
|
|
|
shutil.copyfile(infile, outfile) |
361
|
|
|
shutil.copymode(infile, outfile) |
362
|
|
|
continue |
363
|
|
|
try: |
364
|
|
|
generate_file(project_dir, infile, context, env) |
365
|
|
|
except UndefinedError as err: |
366
|
|
|
if delete_project_on_failure: |
367
|
|
|
rmtree(project_dir) |
368
|
|
|
msg = "Unable to create file '{}'".format(infile) |
369
|
|
|
raise UndefinedVariableInTemplate(msg, err, context) |
370
|
|
|
|
371
|
|
|
_run_hook_from_repo_dir( |
372
|
|
|
repo_dir, |
373
|
|
|
'post_gen_project', |
374
|
|
|
project_dir, |
375
|
|
|
context, |
376
|
|
|
delete_project_on_failure |
377
|
|
|
) |
378
|
|
|
|
379
|
|
|
return project_dir |
380
|
|
|
|