automatic API documentation
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.. default-role:: literal
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===============================
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Configuration handling basics
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Options handling basics
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===============================
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Tiramisu is made of almost three main objects :
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@ -10,8 +10,8 @@ Tiramisu is made of almost three main objects :
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- :class:`tiramisu.option.Option` stands for the option types
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- :class:`tiramisu.option.OptionDescription` is the shema, the option's structure
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Accessing the configuration `Option`'s
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-----------------------------------------
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Accessing the `Option`'s
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-------------------------
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The `Config` object attribute access notation stands for the value of the
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configuration's `Option`. That is, the `Config`'s object attribute is the name
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@ -41,11 +41,10 @@ object is returned, and if no `Option` has been declared in the
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>>> cfg.idontexist
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AttributeError: 'OptionDescription' object has no attribute 'idontexist'
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The configuration `Option` objects (in this case the `BoolOption`), are
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organized into a tree into nested `OptionDescription` objects. Every
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option has a name, as does every option group. The parts of the full
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name of the option are separated by dots: e.g.
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``config.optgroup.optname``.
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The `Option` objects (in this case the `BoolOption`), are organized into a tree
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into nested `OptionDescription` objects. Every option has a name, as does every
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option group. The parts of the full name of the option are separated by dots:
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e.g. ``cfg.optgroup.optname``.
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Let's make the protocol of accessing a config's attribute explicit
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(because explicit is better than implicit):
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@ -61,10 +60,10 @@ Let's make the protocol of accessing a config's attribute explicit
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4. If an option is declared, and a value has been set, the returned value is
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the value of the option.
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But there are special exceptions. We will see later on that an option can be a
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:term:`mandatory option`. A mandatory option is an option that must have a defined value.
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If no value have been set yet, the value is `None`.
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When the option is called to retrieve a value, an exception is raised.
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But there are special exceptions. We will see later on that an option can be a
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:term:`mandatory option`. A mandatory option is an option that must have a defined value.
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If no value have been set yet, the value is `None`.
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When the option is called to retrieve a value, an exception is raised.
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What if a value has been set and `None` is to be returned again ? Don't
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worry, an option value can be "reseted" with the help of the `option.Option.reset()`
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@ -106,6 +105,63 @@ bundled into a configuration object which has a reference to its option
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description (and therefore makes sure that the configuration values
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adhere to the option description).
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Common manipulations
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------------------------
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Let's perform some common manipulation on some options:
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>>> from tiramisu.config import Config
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>>> from tiramisu.option import UnicodeOption, OptionDescription
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>>>
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>>> var1 = UnicodeOption('var1', 'first variable')
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>>> var2 = UnicodeOption('var2', '', u'value')
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>>>
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>>> od1 = OptionDescription('od1', 'first OD', [var1, var2])
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>>> rootod = OptionDescription('rootod', '', [od1])
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let's set somme access rules on the main namespace
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>>> c = Config(rootod)
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>>> c.read_write()
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let's travel the namespaces
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>>> print c
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[od1]
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>>> print c.od1
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var1 = None
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var2 = value
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>>> print c.od1.var1
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None
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>>> print c.od1.var2
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value
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let's modify a value (careful to the value's type...)
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>>> c.od1.var1 = 'value'
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Traceback (most recent call last):
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[...]
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ValueError: invalid value value for option var1
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>>> c.od1.var1 = u'value'
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>>> print c.od1.var1
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value
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>>> c.od1.var2 = u'value2'
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>>> print c.od1.var2
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value2
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let's come back to the default value
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>>> del(c.od1.var2)
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>>> print c.od1.var2
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value
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The value is saved in a :class:`~tiramisu.value.Value` object.
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It is on this object that we have to trigger the `reset`
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Configuration's interesting methods
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------------------------------------------
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@ -123,11 +179,11 @@ Here are the (useful) methods on ``Config`` (or `SubConfig`).
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:members: find, find_first, __iter__, iter_groups, iter_all, make_dict
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.. automethod:: __init__
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.. rubric:: Summary
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.. autosummary::
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find
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find_first
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@ -139,10 +195,10 @@ Here are the (useful) methods on ``Config`` (or `SubConfig`).
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.. rubric:: Methods
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A :class:`~config.CommonConfig` is a abstract base class. A
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:class:`~config.SubConfig` is an just in time created objects that wraps an
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::class:`~option.OptionDescription`. A SubConfig differs from a Config in the
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::fact that a config is a root object and has an environnement, a context wich
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::defines the different properties, access rules, vs... There is generally only
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A :class:`~config.CommonConfig` is a abstract base class. A
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:class:`~config.SubConfig` is an just in time created objects that wraps an
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::class:`~option.OptionDescription`. A SubConfig differs from a Config in the
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::fact that a config is a root object and has an environnement, a context wich
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::defines the different properties, access rules, vs... There is generally only
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::one Config, and many SubConfigs.
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@ -5,22 +5,22 @@ Getting started
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What is options handling ?
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=================================
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Due to more and more available options required to set up an operating system,
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to set up compiler options, vs... it became quite annoying to hand the
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necessary options to where they are actually used and even more annoying to add
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new options. To circumvent these problems the configuration management was
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Due to more and more available options required to set up an operating system,
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to set up compiler options, vs... it became quite annoying to hand the
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necessary options to where they are actually used and even more annoying to add
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new options. To circumvent these problems the configuration management was
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introduced...
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What is Tiramisu ?
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===================
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Tiramisu is an options handler and an options controller, wich aims at
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producing flexible and fast options access. The main advantages are its access
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Tiramisu is an options handler and an options controller, wich aims at
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producing flexible and fast options access. The main advantages are its access
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rules and the fact that the whole consistency is preserved at any time, see
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:doc:`consistency`. There is of course type and structure validations, but also
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:doc:`consistency`. There is of course type and structure validations, but also
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validations towards the whole options.
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Last but not least, options can be reached and changed according to the access
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Last but not least, options can be reached and changed according to the access
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rules from nearly everywhere in your appliance.
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Just the facts
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@ -31,21 +31,21 @@ Just the facts
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Download
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---------
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To obtain a copy of the sources, check it out from the repository using `git`.
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To obtain a copy of the sources, check it out from the repository using `git`.
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We suggest using `git` if one wants to access the current developments.
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::
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git clone git://git.labs.libre-entreprise.org/tiramisu.git
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This will get you a fresh checkout of the code repository in a local directory
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This will get you a fresh checkout of the code repository in a local directory
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named ``tiramisu``.
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Getting started
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-------------------
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Option objects can be created in different ways. Let's perform very basic
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:class:`~tiramisu.option.Option` and :class:`~tiramisu.config.Config` object
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Option objects can be created in different ways. Let's perform very basic
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:class:`~tiramisu.option.Option` and :class:`~tiramisu.config.Config` object
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manipulations:
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::
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>>> descr = OptionDescription("optgroup", "", [
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... BoolOption("bool", "", default=False)])
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>>>
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>>> config = Config(descr)
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>>> # now we have a config, wich contains an option:
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>>> config.bool
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>>> c = Config(descr)
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>>> # now we have a container, wich contains an option:
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>>> c.bool
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False
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>>> config.bool = True
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>>> config.bool
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>>> c.bool = True
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>>> c.bool
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True
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So by now, we have
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- a namespace (which is `config` here)
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- a namespace (which is `c` here)
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- the access of an option's value by the
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attribute access way (here `bool`, wich is a boolean option:
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:class:`tiramisu.option.BoolOption()`.
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:class:`~tiramisu.option.BoolOption()`.
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So, option objects are produced at the entry point and then handed down to
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where they are actually used. This keeps options local but available everywhere
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So, option objects are produced at the entry point and then handed down to
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where they are actually used. This keeps options local but available everywhere
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and consistent.
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The namespace is created, we can set a `read_write` access to the options::
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>>> c.read_write()
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@ -1,7 +1,7 @@
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.. default-role:: literal
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The options
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===============
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The options types
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===================
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Description of Options
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----------------------
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