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Re: jump between if-fi
From: |
Alan Mackenzie |
Subject: |
Re: jump between if-fi |
Date: |
Tue, 1 Jan 2008 19:12:05 +0000 |
User-agent: |
Mutt/1.5.9i |
Hi, Xah!
On Tue, Jan 01, 2008 at 10:12:31AM -0800, Xah Lee wrote:
> rea...@newsguy.com wrote:
> How can I make emacs do something similar with if-fi constructs as it
> does with parens?
[ .... ]
> Now, the problem is to make it work for shell's if/fi syntax. Alan
> Mackenzie gave suggestions how to properly implement this, but he
> drivels on like a militarist sees the world.
And a Happy New Year to you too, Xah!
> Here's a hack that does what you want.
> (defun jump-to-if-fi ()
> "jump to ?$B!Hfi?$B!I if cursor is on word ?$B!Hif?$B!I, and vice versa."
> (interactive)
> (let (myword)
> (setq myword (thing-at-point 'word))
> (if (equal myword "if")
> (progn
> (set-mark-command nil)
> (search-forward "fi")
> )
> (if (equal myword "fi")
> (progn
> (set-mark-command nil)
> (search-backward "if")
> )
> )
> )
> )
> )
> (global-set-key (kbd "<f8>") 'jump-to-if-fi)
That's fine up to a point, my dear boy, but "if"s, "while"s, and so on
nest in shell scripts. The above function thus wouldn't always find the
right "fi" or "if".
The approach is a perfectly good one and can be made to work, but it will
involve some sort of recursion, either by explicitly building a push-down
automaton, or recursively calling functions to scan over "if-fi"s and
"while-done"s.
However, this way will surely be more tedious and difficult to debug and
modify than setting text properties and using Emacs's built in syntax
table functionality.
> Xah
--
Alan Mackenzie (Nuremberg, Germany).
- Re: jump between if-fi, Alan Mackenzie, 2008/01/01
- Re: jump between if-fi, reader, 2008/01/01
- Re: jump between if-fi, Xah Lee, 2008/01/01
- Re: jump between if-fi,
Alan Mackenzie <=
- Re: jump between if-fi, reader, 2008/01/05
- Re: jump between if-fi, Stefan Monnier, 2008/01/09
- Re: jump between if-fi, Arnaldo Mandel, 2008/01/09