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Re: How to do search and replace with a lookup
From: |
tomas |
Subject: |
Re: How to do search and replace with a lookup |
Date: |
Mon, 11 Dec 2017 11:03:08 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
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On Mon, Dec 11, 2017 at 12:49:47AM -0800, Angus Comber wrote:
> I have log file output like this:
>
> Received device state message: pen state = 11 - uig state 10
>
> where pen state and uig state are enums.
>
> I want to do a search and replace where if for example pen state 11 enum is
> diagnostics and uig state 10 enum is starting, then I want the line to be
> updated to:
>
> Received device state message: pen state = diagnostics - uig state starting
>
> What is the easiest way to do this?
>
> I can do search and replace using c-m-% and change for each permutation of
> number to string but that would be fairly labour intensive if enums were
> fairly long. Can I combine that with a lookup somehow? What is best way to
> do it?
If you do query-replace-regexp, you can use \,(...) in the
substitution text for a Lisp expression to be evaluated at
substitution time. You can pass it (parts of) the matched
string with the usual \0, \1, etc.
Thus if you have a mapping available for your enums which
is accessible from Lisp (an alist, a hash, whatever) you
should be half way there.
The manual[1] has a little example (it starts at the point
"Most readers can skip it", so make sure to *not* skip it :-)
The Emacs Wiki[2] has a couple of nice examples.
Just yell if you need more help.
Cheers
[1]
https://www.gnu.org/software/emacs/manual/html_node/emacs/Regexp-Replace.html
[2] https://www.emacswiki.org/emacs/ReplaceRegexpWithLispExpressions
- -- tomás
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