💥 yay more things

cfig.iml

@@ -5,8 +5,22 @@
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/cfig" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/cfig/tests" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/docs" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/docs/_extra" type="java-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/docs/_static" type="java-resource" />
+      <excludeFolder url="file://$MODULE_DIR$/docs/_build" />
+      <excludeFolder url="file://$MODULE_DIR$/.venv" />
+      <excludeFolder url="file://$MODULE_DIR$/.pytest_cache" />
+      <excludeFolder url="file://$MODULE_DIR$/cfig/.pytest_cache" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
+  <component name="PyNamespacePackagesService">
+    <option name="namespacePackageFolders">
+      <list>
+        <option value="$MODULE_DIR$/cfig/sources" />
+      </list>
+    </option>
+  </component>
 </module>

cfig/__init__.py

@@ -4,11 +4,27 @@ This package provides a simple but powerful configuration manager for Python app
 A goal is to allow easy integration of an application with multiple configuration standards, such as environment
 variables, dotenv files, and Docker Secrets files.
 
+.. code-block:: python
+
+    @config.required()
+    def SECRET_KEY(val: str) -> str:
+        "Secret string used to manage tokens."
+        return val
+
 Another goal is to provide informative error messages to the user who is configuring the application, so that they may
 understand what they are doing wrong and fix it immediately.
 
-The final goal is for the package to be fully typed, so that useful information can be received by the developer
+.. code-block:: console
-programming the consumption the configuration files.
+
+    $ python -m cfig.sample
+    === Configuration ===
+
+    SECRET_KEY    → Required, but not set.
+    Secret string used to manage HTTP session tokens.
+
+    HIDDEN_STRING = 'amogus'
+    A string which may be provided to silently print a string to the console.
+
 
 Example
 =======
@@ -46,8 +62,8 @@ application::
         return sqlalchemy.create_engine(val)
 
     if __name__ == "__main__":
-        # TODO: If the configuration file is executed as main, handle the call and display a user-friendly CLI interface.
+        # If the configuration file is executed as main, handle the call and display a user-friendly CLI interface.
-        config()
+        config.cli()
 
 Values can later be accessed by the program by importing the configuration file:
 
@@ -66,11 +82,11 @@ Values can later be accessed by the program by importing the configuration file:
 Terminology
 ===========
 
-In this documentation, some terminology is used repeatedly:
+In this documentation, the following terms are used:
 
-Configuration key
+Key
     The name of a configuration value, usually in SCREAMING_SNAKE_CASE.
-    For example, `PATH`, the name of the environment variable.
+    For example, ``PATH``, the name of the environment variable.
 
 Value
     A single non-processed configuration value in :class:`str` form.

cfig/config.py

@@ -131,7 +131,7 @@ class Configuration:
             log.debug("Item created successfully!")
 
             log.debug("Registering item in the configuration...")
-            self.register(key, item, doc or configurable.__doc__)
+            self.register(key, item, doc if doc is not None else configurable.__doc__)
             log.debug("Registered successfully!")
 
             # Return the created item, so it will take the place of the decorated function
@@ -168,7 +168,7 @@ class Configuration:
             log.debug("Item created successfully!")
 
             log.debug("Registering item in the configuration...")
-            self.register(key, item, doc or configurable.__doc__)
+            self.register(key, item, doc if doc is not None else configurable.__doc__)
             log.debug("Registered successfully!")
 
             # Return the created item, so it will take the place of the decorated function
@@ -215,9 +215,6 @@ class Configuration:
             val = self._retrieve_value_optional(key)
             log.debug("Retrieved value successfully!")
 
-            if val is None:
-                log.debug(f"Not running user-defined configurable function since value is {val!r}.")
-            else:
             log.debug("Running user-defined configurable function...")
             val = resolver(val)
 
@@ -237,7 +234,7 @@ class Configuration:
         else:
             raise errors.MissingValueError(key)
 
-    def _create_proxy_required(self, key: str, f: ct.ResolverRequired) -> lazy_object_proxy.Proxy:
+    def _create_proxy_required(self, key: str, resolver: ct.ResolverRequired) -> lazy_object_proxy.Proxy:
         """
         Create, from a resolver, a proxy intolerant about non-specified values.
         """
@@ -249,7 +246,7 @@ class Configuration:
             log.debug("Retrieved val successfully!")
 
             log.debug("Running user-defined configurable function...")
-            val = f(val)
+            val = resolver(val)
 
             return val
 
@@ -262,7 +259,7 @@ class Configuration:
         :param key: The configuration key to register the proxy to.
         :param proxy: The proxy to register in :attr:`.proxies`.
         :param doc: The docstring to register in :attr:`.docs`.
-        :raises .errors.DuplicateProxyNameError` if the key already exists in either :attr:`.proxies` or :attr:`.docs`.
+        :raises .errors.DuplicateProxyNameError`: if the key already exists in either :attr:`.proxies` or :attr:`.docs`.
         """
 
         if key in self.proxies:

cfig/sample/__main__.py

@@ -21,7 +21,7 @@ def MY_FAVOURITE_STRING(val: str) -> str:
 @config.optional()
 def MY_OPTIONAL_STRING(val: typing.Optional[str]) -> str:
     """
-    Your favourite string, including the empty one!
+    Your favourite string, but optional!
     """
     return val or ""
 
@@ -51,5 +51,13 @@ def MY_FAVOURITE_EVEN_INT(val: str) -> int:
     return n
 
 
+@config.required(key="KEY_NAME")
+def VAR_NAME(val: str) -> str:
+    """
+    This config value looks for a key in the configuration sources but is available at a different key to the programmer.
+    """
+    return val
+
+
 if __name__ == "__main__":
     config.cli()

cfig/sources/env.py

@@ -8,7 +8,7 @@ class EnvironmentSource(Source):
     A source which gets values from environment variables.
     """
 
-    def __init__(self, *, prefix: str = "", suffix: str = "", environment=os.environ):
+    def __init__(self, *, prefix: str = "", suffix: str = "", environment=None):
         self.prefix: str = prefix
         """
         The prefix to be prepended to all environment variable names.
@@ -23,7 +23,7 @@ class EnvironmentSource(Source):
         For example, ``_VAL`` for raw values.
         """
 
-        self.environment = environment
+        self.environment = environment if environment is not None else os.environ
         """
         The environment to retrieve variable values from.
         
@@ -36,4 +36,3 @@ class EnvironmentSource(Source):
     def get(self, key: str) -> t.Optional[str]:
         key = self._process_key(key)
         return self.environment.get(key)
-

cfig/sources/envfile.py

@@ -1,4 +1,3 @@
-import os
 import typing as t
 from cfig.sources.env import EnvironmentSource
 
@@ -6,9 +5,11 @@ from cfig.sources.env import EnvironmentSource
 class EnvironmentFileSource(EnvironmentSource):
     """
     A source which gets values from files at paths specified in environment variables.
+
+    Useful for example with Docker Secrets.
     """
 
-    def __init__(self, *, prefix: str = "", suffix: str = "_FILE", environment=os.environ):
+    def __init__(self, *, prefix: str = "", suffix: str = "_FILE", environment=None):
         super().__init__(prefix=prefix, suffix=suffix, environment=environment)
 
     def get(self, key: str) -> t.Optional[str]:

docs/Makefile

@@ -0,0 +1,20 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+SOURCEDIR     = .
+BUILDDIR      = _build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

docs/conf.py

@@ -0,0 +1,145 @@
+# Extended Sphinx configuration
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
+
+
+###########
+# Imports #
+###########
+
+import datetime
+
+
+###########################
+# Developer configuration #
+###########################
+# Alter these to reflect the nature of your project!
+
+# Project name
+project = 'cfig'
+# Project author
+author = 'Stefano Pigozzi'
+# Project copyright
+project_copyright = f'{datetime.date.today().year}, {author}'
+
+# Sphinx language
+language = "en"
+
+# Configuration for the theme
+html_theme_options = {
+    # Set this to the main color of your project
+    "style_nav_header_background": "#b72f37",
+}
+
+
+##########################
+# Advanced configuration #
+##########################
+# Change these options only if you need further customization
+
+# Sphinx extensions
+extensions = [
+    "sphinx.ext.intersphinx",
+    "sphinx.ext.autodoc",
+    "sphinx.ext.autosectionlabel",
+    "sphinx.ext.todo",
+]
+
+# Source files encoding
+source_encoding = "UTF-8"
+# Source file extensions
+source_suffix = {
+    ".rst": "restructuredtext",
+}
+# Source files parsers
+source_parsers = {}
+
+# The doc from which to start rendering
+root_doc = "index"
+# Files to ignore when rendering
+exclude_patterns = [
+    "build",
+    "_build",
+    "Thumbs.db",
+    ".DS_Store",
+]
+# Sphinx template files
+templates_path = [
+    '_templates',
+]
+
+# Prologue of all rst files
+rst_prolog = ""
+# Epilogue of all rst files
+rst_epilog = ""
+
+# Default domain
+primary_domain = "py"
+# Default role
+default_role = "any"
+
+# Print warnings on the page
+keep_warnings = False
+# Display more warnings than usual
+nitpicky = False
+
+# Intersphinx URLs
+intersphinx_mapping = {
+    "python": ("https://docs.python.org/3.10/", None),
+    "lazy-object-proxy": ("https://python-lazy-object-proxy.readthedocs.io/en/latest/", None),
+    "click": ("https://click.palletsprojects.com/en/latest/", None),
+}
+# Manpages URL
+manpages_url = "https://man.archlinux.org/"
+
+# HTML builder theme
+html_theme = 'sphinx_rtd_theme'
+# Title of the HTML page
+html_title = f"{project}"
+# Short title of the HTML page
+html_short_title = f"{project}"
+# Path of the documentation static files
+html_static_path = [
+    "_static",
+]
+# Path of extra files to add to the build
+html_extra_path = [
+    "_extra",
+]
+# Disable additional indexes
+html_domain_indices = False
+
+# LaTeX rendering engine to use
+latex_engine = "lualatex"
+# LaTeX top level title type
+latex_toplevel_sectioning = "chapter"
+# LaTeX URLs rendering
+latex_show_urls = "footnote"
+# LaTeX theme
+latex_theme = "manual"
+
+# TODOs
+todo_include_todos = True
+todo_emit_warnings = True
+todo_link_only = False
+
+# Smartquotes
+smartquotes_excludes = {
+    "languages": [
+        # Smartquotes is completely broken in italian!
+        "it",
+        # Keep the default, just in case
+        "ja",
+    ],
+    "builders": [
+        "man",
+        "text",
+    ]
+}
+
+
+# Autodoc
+autodoc_member_order = "bysource"
+autodoc_default_options = {
+    "members": True,
+    "undoc-members": True,
+}

docs/index.rst

@@ -0,0 +1,63 @@
+####
+cfig
+####
+
+
+.. automodule:: cfig
+
+
+Classes
+=======
+
+:mod:`cfig.config`
+------------------
+
+.. automodule:: cfig.config
+
+
+:mod:`cfig.errors`
+------------------
+
+.. automodule:: cfig.errors
+    :show-inheritance:
+
+
+Built-in sources
+----------------
+
+:mod:`cfig.sources.base`
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. automodule:: cfig.sources.base
+
+
+:mod:`cfig.sources.env`
+~~~~~~~~~~~~~~~~~~~~~~~
+
+.. automodule:: cfig.sources.env
+    :show-inheritance:
+
+
+:mod:`cfig.sources.envfile`
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. automodule:: cfig.sources.envfile
+    :show-inheritance:
+
+
+Table of contents
+=================
+
+.. error::
+
+    I think I broke Sphinx, since the table of contents doesn't seem to show up...
+
+.. toctree::
+
+
+Other tables and links
+======================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`

docs/make.bat

@@ -0,0 +1,35 @@
+@ECHO OFF
+
+pushd %~dp0
+
+REM Command file for Sphinx documentation
+
+if "%SPHINXBUILD%" == "" (
+	set SPHINXBUILD=sphinx-build
+)
+set SOURCEDIR=.
+set BUILDDIR=_build
+
+%SPHINXBUILD% >NUL 2>NUL
+if errorlevel 9009 (
+	echo.
+	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
+	echo.installed, then set the SPHINXBUILD environment variable to point
+	echo.to the full path of the 'sphinx-build' executable. Alternatively you
+	echo.may add the Sphinx directory to PATH.
+	echo.
+	echo.If you don't have Sphinx installed, grab it from
+	echo.https://www.sphinx-doc.org/
+	exit /b 1
+)
+
+if "%1" == "" goto help
+
+%SPHINXBUILD% -M %1 %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+goto end
+
+:help
+%SPHINXBUILD% -M help %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+
+:end
+popd

poetry.lock

@@ -383,12 +383,12 @@ secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "cer
 socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [extras]
-cli = ["click"]
+cli = ["click", "colorama"]
 
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.10"
-content-hash = "9003e7beceb925ef6b11961ef2a2bb818fbd8f659b312345dd58d86b786e589f"
+content-hash = "5616faafcbdebee63818206fa4529a7dfad7b388a04e3ce34de995046a756e5b"
 
 [metadata.files]
 alabaster = [

pyproject.toml

@@ -1,7 +1,7 @@
 [tool.poetry]
 name = "cfig"
 version = "0.1.0"
-description = "The ultimate configuration manager"
+description = "A configuration manager for Python"
 authors = ["Stefano Pigozzi <me@steffo.eu>"]
 license = "MIT"