Here is a first attempt at proposing a completer that completes words in
history.  This is the start of a replacement for the example in the compctl
manual that searches history if filenames don't match in the default
completion (compctl -D -f + -H 0 '').

This is a pruned down version of the _history_complete_word widget so
that it would behave as a completer function and not as a stand alone
widget.  Some of the behavior provided by the _history_complete_word
widget is lost, but the ability to include it as a completer should be
useful.  It might be useful to use with the predict widgets.

One benefit is that it is now possible to use the default styles that all the
completers use.  For example, matcher-list can be used with _history.

Future changes to this widget might include the ability to limit how much
of history is used for completion, like the old compctl -H flag. 
I think there is a lot of potential to be found in limiting history words to
similar contexts;  only history lines where the current command is used,
or previous values for the current option.   To do this might require
some changes to the zsh/parameter module to make this efficient.

It might be useful to use history as a way to filter completions from other
completers.  To first use completions that are already found in history.
Or the opposite, to eliminate choices that are found in the history.

-FR.


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