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RE: [External] : Re: Operating the HIST feature of completing-read

From: carlmarcos
Subject: RE: [External] : Re: Operating the HIST feature of completing-read
Date: Tue, 12 Jul 2022 18:20:53 +0200 (CEST)

Jul 12, 2022, 14:28 by

>> Here is practically how history works:
>> 1) First you define history variable:
>> (defvar my-history nil "...previous inputs.") ⇒ my-history
>> 2) You use the history variable:
>> (completing-read "X: " '("a" "b") nil nil nil 'my-history) ⇒ "a"
Does the history remember the the user input associated with each specific 
completing-read call?

>> 3) Now you may inspect history variable:
>> my-history ⇒ ("a")
>> 4) Now you may inspect the file (find-file "~/.emacs.d/history")
>>  where history variable will be recorded so that
>>  history works over Emacs sessions
>> 5) You may browse through history by using M-n and M-p as to easy
>>  selection of your previously recorded choices (history).
> Good summary.  Some more:
> 1. If you don't pass a value as the HIST arg to
> minibuffer-reading functions such as `completing-read'
> then the implied, general history variable is used:
> `minibuffer-history'.
> IOW, your minibuffer-input history is always
> recorded in a history variable, whether or not you
> pass a HIST variable.
> If you want to keep a separate history list for some
> interactions then pass a separate history variable.
> If you don't care about keeping a separate list for
> some inputs then don't pass an explicit HIST.
> 2. How do you make use of the history list currently
> available during a read from the minibuffer?  As
> Jean mentioned, use `M-p' and `M-n' to cycle among
> historical inputs.  Or use `M-r' and `M-s' to access
> them directly by matching regexps.
> 3. Ask Emacs!
> `C-h r', `i histor TAB', choose a candidate such as
> `history of minibuffer input'.  That takes you to
> node `Minibuffer History' in the Emacs manual:
> `C-h i m el', `i histor TAB', choose a candidate
> such as `history list'.  That takes you to node
> `Minibuffer History' in the Elisp manual:
> Emacs answers your questions.  And by asking Emacs
> you learn to converse with Emacs, i.e., to ask it
> better, posing your questions using terms that
> Emacs understands best.  (And those terms are also
> those best understood by the Emacs community, if
> you do ask outside Emacs itself.)
> Do yourself a favor and learn to communicate with
> Emacs more fluently.  There are many levels/layers
> to explore & learn, and each opens doors to others.
> Learning how to talk with Emacs is more productive
> than posing lots of one-off questions here and
> there.  And if you do pose questions about Emacs
> outside Emacs then the most helpful questions will
> be about ways how to converse with Emacs (asking
> about asking Emacs).

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