From: Eric Abrahamsen <eric@ericabrahamsen.net>
To: help-gnu-emacs@gnu.org
Subject: Re: Iterating over all buffer lines
Date: Fri, 18 Jan 2013 10:43:01 +0800 [thread overview]
Message-ID: <87y5frjjnu.fsf@ericabrahamsen.net> (raw)
In-Reply-To: CAM=K+irk4Mg4nL26qwYY0PPkzOFinQ-4Z=OcZYeQ2bJTCMOJVw@mail.gmail.com
Le Wang <l26wang@gmail.com> writes:
> (while (not (= (point) (point-max)))
> (message (buffer-substring-no-properties (point-at-bol) (point-at-eol)))
> (forward-line 1))
>
>
> On Fri, Jan 18, 2013 at 4:55 AM, Sean McAfee <eefacm@gmail.com> wrote:
>> I have some code where I want to loop over all of the lines of text in a
>> buffer. I had a prior solution that involved repeatedly searching for
>> the regexp "^.+$", but that seemed a little heavyweight. Also, it only
>> found non-empty lines, and changing the "+" to a "*" to return all lines
>> causes an infinite loop.
>>
>> I just tried my hand at writing a general iterate-all-lines construct,
>> and came up with this:
>>
>> (loop for last-point = (point)
>> while (= 0 (forward-line))
>> for line = (buffer-substring-no-properties
>> last-point
>> (- (point) (if (bolp) 1 0)))
>> ;; do something with line
>> )
Le Wang's solution is probably more idiomatic (for large-scale text
manipulation emacs seems better suited to working on a buffer than a
string), but you could also split the buffer substring on newlines and
map a function over the resulting list:
(mapcar (lambda (line)
(when line (manipulate-line line)))
(split-string
(buffer-substring-no-properties (point-min) (point-max)) "\n"))
prev parent reply other threads:[~2013-01-18 2:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-17 20:55 Iterating over all buffer lines Sean McAfee
2013-01-18 2:15 ` Le Wang
2013-01-18 2:43 ` Eric Abrahamsen [this message]
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