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- From: kgallagh@digi.lonestar.org (Kevin Gallagher)
- Newsgroups: comp.emacs
- Subject: Re: repetetive search with function keys
- Message-ID: <1992Nov23.000647.3309@digi.lonestar.org>
- Date: 23 Nov 92 00:06:47 GMT
- References: <1992Nov20.235319.8477@cs.odu.edu> <1992Nov21.183024.19520@umbc3.umbc.edu>
- Distribution: usa
- Organization: DSC Communications Corp, Plano, TX
- Lines: 58
-
- In article <1992Nov21.183024.19520@umbc3.umbc.edu> steibel@venus.cs.umbc.edu (David M. Steibel) writes:
- >sastr_a@ptah.cs.odu.edu (RAVI AYYALASOMAYAJULA) writes:
- >
- >> My question is how do I make my fuction key search repetitively search
- >> for the search the same string?
- >
- >You would want to bind it to isearch-forward, and isearch-backwards.
-
- The function "isearch-backward" does not have an "s" at the end of the name.
-
- >Note that isearch-forward is sometimes already bound to control-s,
- >except when control-s is used for flow control purposes. Sometimes
- >isearch-forward is bound to control-backslash also.
-
- This particular "binding" is usually accomplished via the keyboard translate
- table, not by re-binding isearch-forward to C-\. (See the GNU Emacs Lisp
- Reference Manual, Edition 1.03, for more information on the use of translate
- tables.)
-
- >[stuff deleted]
- >control-d ends the process, as does moving around with the
- >cursor keys.
-
- This is sometimes NOT true. Actually, the default character used to end an
- isearch is ESC, which is specified in the variable "search-exit-char".
- Control-d usually works as an exit character because the variable
- "search-exit-option" is set to "t", by default, meaning "random control
- characters terminate incremental search". No doubt your arrow keys generate
- control characters, none of which mean anything special to isearch, so isearch
- treats it as random and exits when one of them is pressed. However, if you
- are using a VT100 terminal, the arrow keys generate escape sequences like
- ESC-OA, yielding unexpected results. For example, pressing the up-arrow key
- will exit isearch with the first character ESC, but then the characters OA
- will be entered into the buffer; not exactly what the user had in mind!
-
- On the other hand, if GNU Emacs were installed at your site with the variable
- search-exit-char set to C-d, then the arrow keys on a VT100 will NOT exit
- isearch at all. Isearch will try to search for them, instead.
-
- >Also, if you have finished your search string, and wish to find the second
- >occurance of your search string, press the isearch key again.
-
- If you rebind isearch-forward to something other than C-s, pressing this new
- key to search again will NOT work unless you have set the variable
- "search-repeat-char" to the character generated by the new key used to invoke
- isearch-forward. Unfortunately, setting this variable to more than a single
- character is NOT supported within the isearch-forward function. This means,
- if you bind isearch-forward to a function key that generates a
- multiple-character sequence, you cannot use that same function key to repeat
- the search for the same string (without getting inside and hacking the
- isearch-forward code). (By the way, the corresponding repeat variable for
- isearch-backward is search-reverse-char.)
-
- --
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- Kevin Gallagher kgallagh@digi.lonestar.org OR ...!uunet!digi!kgallagh
- DSC Communications Corporation Addr: MS 152, 1000 Coit Rd, Plano, TX 75075
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