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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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from .context import context_is_version_2 |
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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 apply_default_overwrites_to_context_v2(context, overwrite_default_context): |
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""" |
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Modify the given version 2 context in place based on the |
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overwrite_default_context. |
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""" |
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for variable, overwrite in overwrite_default_context.items(): |
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var_dict = next((d for d in context['variables'] if d['name'] == variable), None) # noqa |
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if var_dict: |
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if 'choices' in var_dict.keys(): |
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context_value = var_dict['choices'] |
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else: |
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context_value = var_dict['default'] |
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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 1st 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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var_dict['default'] = overwrite |
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else: |
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# Simply overwrite the value for this variable |
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var_dict['default'] = overwrite |
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def resolve_changed_variable_names(context, variables_to_resolve): |
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""" |
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The variable names contained in the variables_to_resolve dictionary's |
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key names have been over-written with keys' value. Check the entire |
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context and update any other variable context fields that may still |
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reference the original variable name. |
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""" |
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for var_name_to_resolve in variables_to_resolve: |
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new_var_name = variables_to_resolve[var_name_to_resolve] |
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for variable in context['variables']: |
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for field_name in variable.keys(): |
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if isinstance(variable[field_name], str): |
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if var_name_to_resolve in variable[field_name]: |
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variable[field_name] = variable[field_name].replace(var_name_to_resolve, new_var_name) # noqa |
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elif isinstance(variable[field_name], list): |
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# a choices field could have an str item to update |
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for i, item in enumerate(variable[field_name]): |
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if isinstance(item, str): |
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if var_name_to_resolve in item: |
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variable[field_name][i] = item.replace(var_name_to_resolve, new_var_name) # noqa |
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def apply_overwrites_to_context_v2(context, extra_context): |
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""" |
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Modify the given version 2 context in place based on extra_context. |
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The extra_context parameter may be a dictionary or a list of dictionaries. |
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If extra_context is a dictionary, the key is assumed to identify the |
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variable's 'name' field and the value will be applied to the name field's |
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default value -- this behavior is exactly like version 1 context overwrite |
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behavior. |
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When extra_context is a list of dictionaries, each dictionary MUST specify |
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at the very least a 'name' key/value pair, or a ValueError is raised. The |
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'name' key's value will be used to find the variable dictionary to |
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overwrite by matching each dictionary's 'name' field. |
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If extra_context is a list of dictionaries, apply the overwrite from each |
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dictionary to it's matching variable's dictionary. This allows all fields |
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of a variable to be updated. A match considers the variable's 'name' field |
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only; any name fields in the extra_context list of dictionaries that do |
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not match a variable 'name' field, are ignored. Any key/value pairs |
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specified in an extra_content dictionary that are not already defined by |
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the matching variable dictionary will raise a ValueError. |
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Changing the 'name' Field |
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------------------------- |
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Changing the 'name' field requires a special syntax. Because the algorithm |
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chosen to find a variable’s dictionary entry in the variables list of |
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OrderDicts uses the variable’s ‘name’ field; it could not be used to |
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simultaneously hold a new ‘name’ field value. Therefore the following |
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extra context dictionary entry snytax was introduced to allow the ‘name’ |
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field of a variable to be changed: |
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{ |
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'name': 'CURRENT_VARIABLE_NAME::NEW_VARIABLE_NAME', |
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} |
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So, for example, to change a variable’s ‘name’ field from |
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‘director_credit’ to ‘producer_credit’, would require: |
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{ |
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'name': 'director_credit::producer_credit', |
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} |
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Removing a Field from a Variable |
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-------------------------------- |
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It is possible that a previous extra context overwrite requires that a |
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subsequent variable entry be removed. |
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In order to accomplish this a remove field token is used in the extra |
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context as follows: |
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{ |
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'name': 'director_cut', |
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'skip_if': '<<REMOVE::FIELD>>', |
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} |
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In the example above, the extra context overwrite results in the variable |
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named ‘director_cut’ having it’s ‘skip_if’ field removed. |
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Overwrite Considerations Regarding ‘default’ & ‘choices’ Fields |
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--------------------------------------------------------------- |
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When a variable is defined that has both the ‘default’ and the ‘choices’ |
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fields, these two fields influence each other. If one of these fields is |
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updated, but not the other field, then the other field will be |
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automatically updated by the overwrite logic. |
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If both fields are updated, then the ‘default’ value will be moved to the |
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first location of the ‘choices’ field if it exists elsewhere in the list; |
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if the default value is not in the list, it will be added to the first |
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location in the choices list. |
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""" |
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variable_names_to_resolve = {} |
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if isinstance(extra_context, dict): |
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apply_default_overwrites_to_context_v2(context, extra_context) |
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elif isinstance(extra_context, list): |
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for xtra_ctx_item in extra_context: |
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if isinstance(xtra_ctx_item, dict): |
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if 'name' in xtra_ctx_item.keys(): |
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# xtra_ctx_item['name'] may have a replace value of the |
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# form: |
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# 'name_value::replace_name_value' |
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xtra_ctx_name = xtra_ctx_item['name'].split('::')[0] |
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try: |
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replace_name = xtra_ctx_item['name'].split('::')[1] |
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except IndexError: |
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replace_name = None |
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var_dict = next((d for d in context['variables'] if d['name'] == xtra_ctx_name), None) # noqa |
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if var_dict: |
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# Since creation of new key/value pairs is NOT |
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# desired, we only use a key that is common to both |
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# the variables context and the extra context. |
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common_keys = [key for key in xtra_ctx_item.keys() if key in var_dict.keys()] # noqa |
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for key in common_keys: |
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if xtra_ctx_item[key] == '<<REMOVE::FIELD>>': |
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var_dict.pop(key, None) |
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else: |
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# normal field update |
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var_dict[key] = xtra_ctx_item[key] |
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# After all fields have been updated, there is some |
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# house-keeping to do. The default/choices |
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# house-keeping could effecively be no-ops if the |
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# user did the correct thing. |
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if ('default' in common_keys) & ('choices' in var_dict.keys()): # noqa |
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# default updated, regardless if choices has been |
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# updated, re-order choices based on default |
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if var_dict['default'] in var_dict['choices']: |
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var_dict['choices'].remove(var_dict['default']) # noqa |
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var_dict['choices'].insert(0, var_dict['default']) |
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if ('default' not in common_keys) & ('choices' in common_keys): # noqa |
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# choices updated, so update default based on |
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# first location in choices |
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var_dict['default'] = var_dict['choices'][0] |
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if replace_name: |
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variable_names_to_resolve[xtra_ctx_name] = replace_name # noqa |
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var_dict['name'] = replace_name |
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else: |
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msg = "No variable found in context whose name matches extra context name '{name}'" # noqa |
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raise ValueError(msg.format(name=xtra_ctx_name)) |
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else: |
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msg = "Extra context dictionary item {item} is missing a 'name' key." # noqa |
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raise ValueError(msg.format(item=xtra_ctx_item)) |
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else: |
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msg = "Extra context list item '{item}' is of type {t}, should be a dictionary." # noqa |
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raise ValueError(msg.format(item=str(xtra_ctx_item), t=type(xtra_ctx_item).__name__)) # noqa |
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if variable_names_to_resolve: |
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# At least one variable name has been over-written, if any |
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# variables use the original name, they must get updated as well |
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resolve_changed_variable_names(context, variable_names_to_resolve) |
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else: |
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msg = "Extra context must be a dictionary or a list of dictionaries!" |
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raise ValueError(msg) |
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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 context_is_version_2(context[file_stem]): |
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logger.debug("Context is version 2") |
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if default_context: |
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apply_overwrites_to_context_v2(obj, default_context) |
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if extra_context: |
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apply_overwrites_to_context_v2(obj, extra_context) |
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else: |
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logger.debug("Context is version 1") |
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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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320
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logger.debug('Context generated is {}'.format(context)) |
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return context |
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323
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324
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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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326
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327
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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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331
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rendered infile to outfile. |
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332
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333
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Precondition: |
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334
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|
335
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When calling `generate_file()`, the root template dir must be the |
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336
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current working directory. Using `utils.work_in()` is the recommended |
|
337
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way to perform this directory change. |
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338
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339
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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 |
|
341
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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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|
347
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# Render the path to the output file (not including the root project dir) |
|
348
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|
outfile_tmpl = env.from_string(infile) |
|
349
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|
|
350
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outfile = os.path.join(project_dir, outfile_tmpl.render(**context)) |
|
351
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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)) |
|
354
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|
|
return |
|
355
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|
|
356
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|
|
logger.debug('Created file at {0}'.format(outfile)) |
|
357
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|
|
358
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|
# Just copy over binary files. Don't render. |
|
359
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|
|
logger.debug("Check {} to see if it's a binary".format(infile)) |
|
360
|
|
|
if is_binary(infile): |
|
361
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|
|
logger.debug( |
|
362
|
|
|
'Copying binary {} to {} without rendering' |
|
363
|
|
|
''.format(infile, outfile) |
|
364
|
|
|
) |
|
365
|
|
|
shutil.copyfile(infile, outfile) |
|
366
|
|
|
else: |
|
367
|
|
|
# Force fwd slashes on Windows for get_template |
|
368
|
|
|
# This is a by-design Jinja issue |
|
369
|
|
|
infile_fwd_slashes = infile.replace(os.path.sep, '/') |
|
370
|
|
|
|
|
371
|
|
|
# Render the file |
|
372
|
|
|
try: |
|
373
|
|
|
tmpl = env.get_template(infile_fwd_slashes) |
|
374
|
|
|
except TemplateSyntaxError as exception: |
|
375
|
|
|
# Disable translated so that printed exception contains verbose |
|
376
|
|
|
# information about syntax error location |
|
377
|
|
|
exception.translated = False |
|
378
|
|
|
raise |
|
379
|
|
|
rendered_file = tmpl.render(**context) |
|
380
|
|
|
|
|
381
|
|
|
logger.debug('Writing contents to file {}'.format(outfile)) |
|
382
|
|
|
|
|
383
|
|
|
with io.open(outfile, 'w', encoding='utf-8') as fh: |
|
384
|
|
|
fh.write(rendered_file) |
|
385
|
|
|
|
|
386
|
|
|
# Apply file permissions to output file |
|
387
|
|
|
shutil.copymode(infile, outfile) |
|
388
|
|
|
|
|
389
|
|
|
|
|
390
|
|
|
def render_and_create_dir(dirname, context, output_dir, environment, |
|
391
|
|
|
overwrite_if_exists=False): |
|
392
|
|
|
"""Render name of a directory, create the directory, return its path.""" |
|
393
|
|
|
name_tmpl = environment.from_string(dirname) |
|
394
|
|
|
rendered_dirname = name_tmpl.render(**context) |
|
395
|
|
|
|
|
396
|
|
|
dir_to_create = os.path.normpath( |
|
397
|
|
|
os.path.join(output_dir, rendered_dirname) |
|
398
|
|
|
) |
|
399
|
|
|
|
|
400
|
|
|
logger.debug('Rendered dir {} must exist in output_dir {}'.format( |
|
401
|
|
|
dir_to_create, |
|
402
|
|
|
output_dir |
|
403
|
|
|
)) |
|
404
|
|
|
|
|
405
|
|
|
output_dir_exists = os.path.exists(dir_to_create) |
|
406
|
|
|
|
|
407
|
|
|
if output_dir_exists: |
|
408
|
|
|
if overwrite_if_exists: |
|
409
|
|
|
logger.debug( |
|
410
|
|
|
'Output directory {} already exists,' |
|
411
|
|
|
'overwriting it'.format(dir_to_create) |
|
412
|
|
|
) |
|
413
|
|
|
else: |
|
414
|
|
|
msg = 'Error: "{}" directory already exists'.format(dir_to_create) |
|
415
|
|
|
raise OutputDirExistsException(msg) |
|
416
|
|
|
else: |
|
417
|
|
|
make_sure_path_exists(dir_to_create) |
|
418
|
|
|
|
|
419
|
|
|
return dir_to_create, not output_dir_exists |
|
420
|
|
|
|
|
421
|
|
|
|
|
422
|
|
|
def ensure_dir_is_templated(dirname): |
|
423
|
|
|
"""Ensure that dirname is a templated directory name.""" |
|
424
|
|
|
if '{{' in dirname and '}}' in dirname: |
|
425
|
|
|
return True |
|
426
|
|
|
else: |
|
427
|
|
|
raise NonTemplatedInputDirException |
|
428
|
|
|
|
|
429
|
|
|
|
|
430
|
|
|
def _run_hook_from_repo_dir(repo_dir, hook_name, project_dir, context, |
|
431
|
|
|
delete_project_on_failure): |
|
432
|
|
|
"""Run hook from repo directory, clean project directory if hook fails. |
|
433
|
|
|
|
|
434
|
|
|
:param repo_dir: Project template input directory. |
|
435
|
|
|
:param hook_name: The hook to execute. |
|
436
|
|
|
:param project_dir: The directory to execute the script from. |
|
437
|
|
|
:param context: Cookiecutter project context. |
|
438
|
|
|
:param delete_project_on_failure: Delete the project directory on hook |
|
439
|
|
|
failure? |
|
440
|
|
|
""" |
|
441
|
|
|
with work_in(repo_dir): |
|
442
|
|
|
try: |
|
443
|
|
|
run_hook(hook_name, project_dir, context) |
|
444
|
|
|
except FailedHookException: |
|
445
|
|
|
if delete_project_on_failure: |
|
446
|
|
|
rmtree(project_dir) |
|
447
|
|
|
logger.error( |
|
448
|
|
|
"Stopping generation because {} hook " |
|
449
|
|
|
"script didn't exit successfully".format(hook_name) |
|
450
|
|
|
) |
|
451
|
|
|
raise |
|
452
|
|
|
|
|
453
|
|
|
|
|
454
|
|
|
def generate_files(repo_dir, context=None, output_dir='.', |
|
455
|
|
|
overwrite_if_exists=False): |
|
456
|
|
|
"""Render the templates and saves them to files. |
|
457
|
|
|
|
|
458
|
|
|
:param repo_dir: Project template input directory. |
|
459
|
|
|
:param context: Dict for populating the template's variables. |
|
460
|
|
|
:param output_dir: Where to output the generated project dir into. |
|
461
|
|
|
:param overwrite_if_exists: Overwrite the contents of the output directory |
|
462
|
|
|
if it exists. |
|
463
|
|
|
""" |
|
464
|
|
|
template_dir = find_template(repo_dir) |
|
465
|
|
|
logger.debug('Generating project from {}...'.format(template_dir)) |
|
466
|
|
|
context = context or {} |
|
467
|
|
|
|
|
468
|
|
|
unrendered_dir = os.path.split(template_dir)[1] |
|
469
|
|
|
ensure_dir_is_templated(unrendered_dir) |
|
470
|
|
|
env = StrictEnvironment( |
|
471
|
|
|
context=context, |
|
472
|
|
|
keep_trailing_newline=True, |
|
473
|
|
|
) |
|
474
|
|
|
try: |
|
475
|
|
|
project_dir, output_directory_created = render_and_create_dir( |
|
476
|
|
|
unrendered_dir, |
|
477
|
|
|
context, |
|
478
|
|
|
output_dir, |
|
479
|
|
|
env, |
|
480
|
|
|
overwrite_if_exists |
|
481
|
|
|
) |
|
482
|
|
|
except UndefinedError as err: |
|
483
|
|
|
msg = "Unable to create project directory '{}'".format(unrendered_dir) |
|
484
|
|
|
raise UndefinedVariableInTemplate(msg, err, context) |
|
485
|
|
|
|
|
486
|
|
|
# We want the Jinja path and the OS paths to match. Consequently, we'll: |
|
487
|
|
|
# + CD to the template folder |
|
488
|
|
|
# + Set Jinja's path to '.' |
|
489
|
|
|
# |
|
490
|
|
|
# In order to build our files to the correct folder(s), we'll use an |
|
491
|
|
|
# absolute path for the target folder (project_dir) |
|
492
|
|
|
|
|
493
|
|
|
project_dir = os.path.abspath(project_dir) |
|
494
|
|
|
logger.debug('Project directory is {}'.format(project_dir)) |
|
495
|
|
|
|
|
496
|
|
|
# if we created the output directory, then it's ok to remove it |
|
497
|
|
|
# if rendering fails |
|
498
|
|
|
delete_project_on_failure = output_directory_created |
|
499
|
|
|
|
|
500
|
|
|
_run_hook_from_repo_dir( |
|
501
|
|
|
repo_dir, |
|
502
|
|
|
'pre_gen_project', |
|
503
|
|
|
project_dir, |
|
504
|
|
|
context, |
|
505
|
|
|
delete_project_on_failure |
|
506
|
|
|
) |
|
507
|
|
|
|
|
508
|
|
|
with work_in(template_dir): |
|
509
|
|
|
env.loader = FileSystemLoader('.') |
|
510
|
|
|
|
|
511
|
|
|
for root, dirs, files in os.walk('.'): |
|
512
|
|
|
# We must separate the two types of dirs into different lists. |
|
513
|
|
|
# The reason is that we don't want ``os.walk`` to go through the |
|
514
|
|
|
# unrendered directories, since they will just be copied. |
|
515
|
|
|
copy_dirs = [] |
|
516
|
|
|
render_dirs = [] |
|
517
|
|
|
|
|
518
|
|
|
for d in dirs: |
|
519
|
|
|
d_ = os.path.normpath(os.path.join(root, d)) |
|
520
|
|
|
# We check the full path, because that's how it can be |
|
521
|
|
|
# specified in the ``_copy_without_render`` setting, but |
|
522
|
|
|
# we store just the dir name |
|
523
|
|
|
if is_copy_only_path(d_, context): |
|
524
|
|
|
copy_dirs.append(d) |
|
525
|
|
|
else: |
|
526
|
|
|
render_dirs.append(d) |
|
527
|
|
|
|
|
528
|
|
|
for copy_dir in copy_dirs: |
|
529
|
|
|
indir = os.path.normpath(os.path.join(root, copy_dir)) |
|
530
|
|
|
outdir = os.path.normpath(os.path.join(project_dir, indir)) |
|
531
|
|
|
logger.debug( |
|
532
|
|
|
'Copying dir {} to {} without rendering' |
|
533
|
|
|
''.format(indir, outdir) |
|
534
|
|
|
) |
|
535
|
|
|
shutil.copytree(indir, outdir) |
|
536
|
|
|
|
|
537
|
|
|
# We mutate ``dirs``, because we only want to go through these |
|
538
|
|
|
# dirs recursively |
|
539
|
|
|
dirs[:] = render_dirs |
|
540
|
|
|
for d in dirs: |
|
541
|
|
|
unrendered_dir = os.path.join(project_dir, root, d) |
|
542
|
|
|
try: |
|
543
|
|
|
render_and_create_dir( |
|
544
|
|
|
unrendered_dir, |
|
545
|
|
|
context, |
|
546
|
|
|
output_dir, |
|
547
|
|
|
env, |
|
548
|
|
|
overwrite_if_exists |
|
549
|
|
|
) |
|
550
|
|
|
except UndefinedError as err: |
|
551
|
|
|
if delete_project_on_failure: |
|
552
|
|
|
rmtree(project_dir) |
|
553
|
|
|
_dir = os.path.relpath(unrendered_dir, output_dir) |
|
554
|
|
|
msg = "Unable to create directory '{}'".format(_dir) |
|
555
|
|
|
raise UndefinedVariableInTemplate(msg, err, context) |
|
556
|
|
|
|
|
557
|
|
|
for f in files: |
|
558
|
|
|
infile = os.path.normpath(os.path.join(root, f)) |
|
559
|
|
|
if is_copy_only_path(infile, context): |
|
560
|
|
|
outfile_tmpl = env.from_string(infile) |
|
561
|
|
|
outfile_rendered = outfile_tmpl.render(**context) |
|
562
|
|
|
outfile = os.path.join(project_dir, outfile_rendered) |
|
563
|
|
|
logger.debug( |
|
564
|
|
|
'Copying file {} to {} without rendering' |
|
565
|
|
|
''.format(infile, outfile) |
|
566
|
|
|
) |
|
567
|
|
|
shutil.copyfile(infile, outfile) |
|
568
|
|
|
shutil.copymode(infile, outfile) |
|
569
|
|
|
continue |
|
570
|
|
|
try: |
|
571
|
|
|
generate_file(project_dir, infile, context, env) |
|
572
|
|
|
except UndefinedError as err: |
|
573
|
|
|
if delete_project_on_failure: |
|
574
|
|
|
rmtree(project_dir) |
|
575
|
|
|
msg = "Unable to create file '{}'".format(infile) |
|
576
|
|
|
raise UndefinedVariableInTemplate(msg, err, context) |
|
577
|
|
|
|
|
578
|
|
|
_run_hook_from_repo_dir( |
|
579
|
|
|
repo_dir, |
|
580
|
|
|
'post_gen_project', |
|
581
|
|
|
project_dir, |
|
582
|
|
|
context, |
|
583
|
|
|
delete_project_on_failure |
|
584
|
|
|
) |
|
585
|
|
|
|
|
586
|
|
|
return project_dir |
|
587
|
|
|
|
audreyr /
cookiecutter
