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README.html
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<body>
<div class="document" id="prolog">
<h1 class="title">prolog</h1>
<p>Tools and convenience methods to simplify and expedite Python logging.</p>
<ul class="simple">
<li><p>Simple - though opinionated - setup for common use-cases</p></li>
<li><p>Extensively and easily configurable via user and local files, as well as environ variables</p></li>
<li><p>Comes with full featured formatters and handlers that can also be used
in normal <span class="docutils literal">logging</span> situations</p></li>
</ul>
<div class="section" id="usage">
<h1>Usage</h1>
<div class="section" id="basic-config">
<h2><span class="docutils literal">basic_config</span></h2>
<p>The easiest way to begin using <span class="docutils literal">prolog</span> is to add the following to your
application code:</p>
<pre class="literal-block">import prolog
prolog.basic_config()</pre>
<p>This will configure the <span class="docutils literal">root</span> logger for the default level <span class="docutils literal">logging.INFO</span>
and set up two handlers: a colorized, console streaming handler, as well as a file
handler set to log to the default file - <span class="docutils literal">pypro.log</span> - in the main app's directory.</p>
<p>To specify select loggers defined in application or library code, you pass the
comma-seperated names of the desired loggers:</p>
<pre class="literal-block">prolog.basic_config('myapp,another_app')</pre>
<p><span class="docutils literal">basic_config</span> accepts the following parameters:</p>
<dl class="simple">
<dt><span class="docutils literal">loggers</span></dt>
<dd><p>The desired loggers to configure; can be either a comma-separated
string of logger names, a list of <span class="docutils literal">Logger</span> instances, or <span class="docutils literal">None</span>
for the root logger.</p>
</dd>
<dt><span class="docutils literal">level</span></dt>
<dd><p>Specify the logging level for all loggers and handlers. Can be
either the numeric value or string name for the desired level.</p>
</dd>
<dt><span class="docutils literal">handlers</span></dt>
<dd><p>The handlers to add to the given <span class="docutils literal">loggers</span>; can be a comma-separated
string of shortcut names ('stream' or 'file', by default) or a list
of <span class="docutils literal">Handler</span> instances.</p>
</dd>
<dt><span class="docutils literal">propagate</span></dt>
<dd><p>Indicates whether each <span class="docutils literal">logger</span> instance will be set to propagte.</p>
</dd>
<dt><span class="docutils literal">reset_handlers</span></dt>
<dd><p>If True, force a reset of all currently configured handlers.</p>
</dd>
<dt><span class="docutils literal">cfg</span></dt>
<dd><p>The <span class="docutils literal">prolog.config.PrologConfig</span> instance to use. If not given,
the default will be used (<span class="docutils literal">prolog.config.config</span>). For all
preceding parameters except for <span class="docutils literal">loggers</span> set to None (the default),
<span class="docutils literal">cfg</span> will be used to determine the appropriate setting.</p>
</dd>
</dl>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<p>Once installed, <strong>prolog</strong> can be invoked to show configuration settings or
sample usage:</p>
<pre class="literal-block">$ python -m prolog sample --level=DEBUG basic</pre>
<img alt="https://raw.githubusercontent.com/dakrauth/prolog/master/resources/basic-output.png" src="https://raw.githubusercontent.com/dakrauth/prolog/master/resources/basic-output.png" />
<p>Setting colors via environments variables:</p>
<pre class="literal-block">$ export PYPROLOG_LEVEL_COLORS='CRITICAL:white,red;ERROR:lightred;DEBUG:lightgray,cyan;*:gray,gray'
$ python -m prolog sample --level=DEBUG basic</pre>
<img alt="https://raw.githubusercontent.com/dakrauth/prolog/master/resources/env-color-output.png" src="https://raw.githubusercontent.com/dakrauth/prolog/master/resources/env-color-output.png" />
</div>
</div>
<div class="section" id="develop-and-testing">
<h1>Develop and testing</h1>
<pre class="literal-block">$ pip install invoke
$ inv develop
$ inv test</pre>
</div>
<div class="section" id="configuration">
<h1>Configuration</h1>
<p>Prolog can be configured via a number of different options:</p>
<ul class="simple">
<li><p>User-level configuration file, using <span class="docutils literal">appdirs</span> to determine the user's
configuration directory plus <span class="docutils literal">pyprolog/config</span>, which must be a JSON encoded
file containing a dictionary overriding any of the defaults listed below</p></li>
<li><p>Current working directory configuration file <span class="docutils literal">.pyprologrc</span>, also JSON</p></li>
<li><p>Environment variables, see below</p></li>
<li><p>Manipulation of the default <span class="docutils literal">prolog.config.config</span> instance or instantiating
your own</p></li>
<li><p>Generating a <span class="docutils literal">logging.config.dictConfig</span> dict via <span class="docutils literal">prolog.config.dict_config</span></p></li>
</ul>
<div class="section" id="defaults">
<h2>Defaults</h2>
<pre class="literal-block">LEVEL = 'INFO'
SHORT_FMT = "{levelname}:{name} {message}"
LONG_FMT = '[{asctime} {name}:{levelname}:{module}:{lineno}] {message}'
COLOR_LONG_FMT = '{color}[{asctime} {name}:{levelname}:{module}:{lineno}]{endcolor} {message}'
COLOR_SHORT_FMT = '{color}{levelname}:{name}{endcolor} {message}'
LEVEL_COLORS = 'DEBUG:magenta;INFO:blue;WARNING:yellow;ERROR:red;CRITICAL:white,red'
DATE_FMT = "%Y-%m-%dT%H:%M:%S"
STYLE_FMT = '{'
HANDLERS = 'stream,file'
PROPAGATE = False
DISABLE_EXISTING = True
RESET_HANDLERS = True
STREAM_LEVEL = 'NOTSET'
STREAM_FORMATTER = 'color'
STREAM_STREAM = 'sys.stderr'
FILE_LEVEL = 'NOTSET'
FILE_FORMATTER = 'long'
FILE_FILENAME = 'pypro.log'
FILE_MAX_BYTES = 0
FILE_BACKUP_COUNT = 0</pre>
</div>
<div class="section" id="environment">
<h2>Environment</h2>
<p>By default, the <span class="docutils literal">prolog.config.config</span> instance will load any environment
variable begging with <span class="docutils literal">PYPROLOG_</span> and ending with any of the defaults listed
above. For instance, to override the default logging level, do the following
before executing your application code:</p>
<pre class="literal-block">$ export PYPROLOG_LEVEL='DEBUG'
$ python myapp.py</pre>
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