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All config options used within Mercurial should be registered.
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Config Option in Core
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=====================
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Config options used by Mercurial core are registered in the
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``mercurial.configitems`` module.
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Simple entry
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------------
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A registration entry typically looks like::
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coreconfigitem('section', 'option',
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default=MyDefaultValue,
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)
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Once registered, Mercurial will know that ``section.option`` is a legitimate
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config option and that ``MyDefaultValue`` should be used if no other values are
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defined in configuration files.
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Complex default value
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---------------------
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If the default provided is a callable, it is called to retrieve the default
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value when accessing the config option. This is useful for default values that
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are mutable like the empty list::
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coreconfigitem('pager', 'ignore',
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default=list,
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)
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In addition, there are cases where the default is not fixed, but computed from
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other properties. In this case, use the ``dynamicdefault`` object as the value
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for the ``default`` parameter. A default value is then explicitly required when
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reading the option::
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# registration
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coreconfigitem('web', 'name',
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default=dynamicdefault,
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)
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# usage
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ui.config('web', 'name', dirname)
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Free form options
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-----------------
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Some config sections use free form options (e.g. ``paths``). You can register
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them using the ``generic`` parameters::
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coreconfigitem('paths', '.*',
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default=None,
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generic=True,
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)
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When ``generic=True`` is set, the option name is matched as a regular expression
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(rooted to string start). It can be used to select specific sub parameters::
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coreconfigitem('merge-tools', br'.*\.args$',
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default="$local $base $other",
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generic=True,
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priority=-1,
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)
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The ``priority`` parameter controls the order used to match the generic pattern
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(lower first).
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Config Option in Extensions
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===========================
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General case
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------------
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Extensions should register config items through the ``registrar`` API (also used
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for commands and others)::
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configtable = {}
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configitem = registrar.configitem(configtable)
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configitem('blackbox', 'dirty',
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default=False,
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)
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The ``dynamicdefault`` object is then available as
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``configitem.dynamicdefault``.
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Supporting older versions
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-------------------------
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The registrar was introduced in Mercurial 4.3, and the ``generic`` parameter was
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introduced in 4.4. Starting with Mercurial 4.4, all core options were registered
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and developer warnings are emitted when accessing unregistered option.
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Extensions supporting versions older than Mercurial 4.3 cannot rely on the
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default value being registered. The simplest way to register an option while
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still supporting an older version is to use ``dynamicdefault`` for options
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requiring a default value. The existing code passing an explicit default can
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then stay in use until compatibility with Mercurial 4.2 is dropped.
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As reminder, here are the default values for each config type:
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- config: None
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- configbool: False
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- configbytes: 0
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- configdate: None
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- configint: None
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- configlist: []
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- configpath: None
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