(aspell.info.gz) How Aspell Selects an Appropriate Dictionary

Info Catalog (aspell.info.gz) Using aspell-import (aspell.info.gz) Working With Dictionaries (aspell.info.gz) Listing Available Dictionaries
 
 5.2 How Aspell Selects an Appropriate Dictionary
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 If the `master' option is set in any fashion (via the command line, the
 `ASPELL_CONF' environment variable, or a configuration file) Aspell
 will look for a dictionary of that name.  If one could not be found, it
 will complain.
 
    Otherwise it will use the value of the `lang' option to search for
 an appropriate dictionary.  If more than one dictionary is found for
 the given language string then it will look for a dictionary with a
 matching variety if the `variety' option is set.  If it is not set it
 will look for a dictionary without a variety.  If after matching the
 `lang' and `variety' there is still more than one dictionary available
 it will find one with the size closest to the value of the `size'
 option.  The default size is 60.  If Aspell cannot find a dictionary
 based on the `lang' option then it will give up and complain.
 
    If the `lang' option is not explicitly set its value will be based
 on the `LC_MESSAGES' locale.  This locale is generally taken from the
 `LC_MESSAGES' environment variable or the `LANG' environment variable
 if `LC_MESSAGES' is not set.  However, if Aspell is being used as a
 library from within another program which already explicitly set the
 locale then it will use the locale of the library rather than the
 environment variables.  If Aspell cannot determine the language from
 the `LC_MESSAGES' locale than it will default to `en_US'.
 
    The list option `dict-alias' can be used to influence which
 dictionary is selected by creating an alias from one dictionary name to
 another.  This option is most useful when there is more than one
 dictionary for a given language.  For example `add-dict-alias en_US
 en_US-w_accents' will cause Aspell to choose the accented version of
 the American English dictionary instead of the non-accented version.
 To add an alias use:
 
      add-dict-alias NAME VAL
 
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