From: Drew Adams <drew.adams@oracle.com>
To: John Wiegley <jwiegley@gmail.com>,
Lars Magne Ingebrigtsen <larsi@gnus.org>
Cc: Karl Fogel <kfogel@red-bean.com>,
Stefan Monnier <monnier@IRO.UMontreal.CA>,
emacs-devel@gnu.org
Subject: RE: "Staying in the same place"
Date: Mon, 4 Apr 2016 17:36:29 -0700 (PDT) [thread overview]
Message-ID: <29972ee1-15f4-40fc-86dd-fb2217aa158a@default> (raw)
In-Reply-To: <m2twjh6jul.fsf@newartisans.com>
> Basically, a "fuzzy position" is three things:
>
> Some internal value, potentially unique to each mode
> A method to return such a value based on point
> A method to restore point based on such a value
>
> Seeing this as an abstract data type, the default would be:
>
> #<marker>, point-marker, goto-char
Actually, the default for a bookmark is:
1. A general context, such as a file or buffer (e.g. an absolute
file name or a buffer name).
2. A position within that context (e.g. a buffer position).
3. Some context text immediately after the position.
4. Some context text immediately before the position.
5. A handler function that accepts the bookmark as argument
and returns point to the place that was bookmarked.
The default handler goes first to the recorded position.
It then searches forward for the after-position context text.
It then searches backward for the before-position context text.
The point is to try to accommodate changes to the file or buffer
text, i.e., to return to the most appropriate place that can be
found.
Special kinds of bookmarks (Info, Dired, `man', etc.) use special
handler functions.
prev parent reply other threads:[~2016-04-05 0:36 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-04 5:40 "Staying in the same place" Lars Magne Ingebrigtsen
2016-04-04 6:09 ` Lars Magne Ingebrigtsen
2016-04-04 7:28 ` Daniel McClanahan
2016-04-04 12:51 ` Stefan Monnier
2016-04-04 18:19 ` Lars Magne Ingebrigtsen
2016-04-04 18:36 ` Stefan Monnier
2016-04-04 18:42 ` Lars Magne Ingebrigtsen
2016-04-04 19:25 ` Karl Fogel
2016-04-04 19:43 ` Lars Magne Ingebrigtsen
2016-04-04 19:49 ` Karl Fogel
2016-04-04 19:52 ` Lars Magne Ingebrigtsen
2016-04-04 23:21 ` John Wiegley
2016-04-05 0:36 ` Drew Adams [this message]
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