* is it easy to make line numbering start at 0 too?
@ 2003-01-08 1:57 Christian Seberino
2003-01-09 12:02 ` John Paul Wallington
` (3 more replies)
0 siblings, 4 replies; 6+ messages in thread
From: Christian Seberino @ 2003-01-08 1:57 UTC (permalink / raw)
is it easy to make line numbering start at 0 too?
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: is it easy to make line numbering start at 0 too?
2003-01-08 1:57 is it easy to make line numbering start at 0 too? Christian Seberino
@ 2003-01-09 12:02 ` John Paul Wallington
[not found] ` <20030109131745.A31056@spawar.navy.mil>
2003-01-10 23:19 ` Rikard Bosnjakovic
` (2 subsequent siblings)
3 siblings, 1 reply; 6+ messages in thread
From: John Paul Wallington @ 2003-01-09 12:02 UTC (permalink / raw)
seberino@spawar.navy.mil (Christian Seberino) wrote:
> is it easy to make line numbering start at 0 too?
If you mean in the modeline, the best bet is probably to hack the
decode_mode_spec in xdisp.c:
[caveats: I don't grok C, and the doc-string format is different for
released versions of Emacs.]
Index: xdisp.c
===================================================================
RCS file: /cvsroot/emacs/emacs/src/xdisp.c,v
retrieving revision 1.798
diff -u -r1.798 xdisp.c
--- xdisp.c 6 Jan 2003 00:58:45 -0000 1.798
+++ xdisp.c 9 Jan 2003 11:31:41 -0000
@@ -464,6 +464,14 @@
int cursor_type_changed;
+/* Nonzero means column number display starts at one */
+
+int column_number_start_at_one;
+
+/* Nonzero means line number display starts at one */
+
+int line_number_start_at_one;
+
/* Nonzero after display_mode_line if %l was used and it displayed a
line number. */
@@ -14625,6 +14633,8 @@
{
int col = (int) current_column (); /* iftc */
w->column_number_displayed = make_number (col);
+ if (column_number_start_at_one)
+ ++col;
pint2str (decode_mode_spec_buf, field_width, col);
return decode_mode_spec_buf;
}
@@ -14732,6 +14742,8 @@
/* Now count lines from the start pos to point. */
nlines = display_count_lines (startpos, startpos_byte,
PT_BYTE, PT, &junk);
+ if (!line_number_start_at_one)
+ --nlines;
/* Record that we did display the line number. */
line_number_displayed = 1;
@@ -15663,6 +15675,14 @@
Any other value means to use the appropriate face, `mode-line',
`header-line', or `menu' respectively. */);
mode_line_inverse_video = 1;
+
+ DEFVAR_BOOL ("column-number-start-at-one", &column_number_start_at_one,
+ doc: /* *Non-nil means column number display starts at one. */);
+ column_number_start_at_one = 0;
+
+ DEFVAR_BOOL ("line-number-start-at-one", &line_number_start_at_one,
+ doc: /* *Non-nil means line number display starts at one. */);
+ line_number_start_at_one = 1;
DEFVAR_LISP ("line-number-display-limit", &Vline_number_display_limit,
doc: /* *Maximum buffer size for which line number should be displayed.
--
John Paul Wallington
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: is it easy to make line numbering start at 0 too?
2003-01-08 1:57 is it easy to make line numbering start at 0 too? Christian Seberino
2003-01-09 12:02 ` John Paul Wallington
@ 2003-01-10 23:19 ` Rikard Bosnjakovic
2003-01-10 23:50 ` Benjamin Lewis
2003-01-11 0:10 ` Henrik Enberg
3 siblings, 0 replies; 6+ messages in thread
From: Rikard Bosnjakovic @ 2003-01-10 23:19 UTC (permalink / raw)
> is it easy to make line numbering start at 0 too?
?
--
Friendly,
Rikard
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: is it easy to make line numbering start at 0 too?
2003-01-08 1:57 is it easy to make line numbering start at 0 too? Christian Seberino
2003-01-09 12:02 ` John Paul Wallington
2003-01-10 23:19 ` Rikard Bosnjakovic
@ 2003-01-10 23:50 ` Benjamin Lewis
2003-01-11 0:10 ` Henrik Enberg
3 siblings, 0 replies; 6+ messages in thread
From: Benjamin Lewis @ 2003-01-10 23:50 UTC (permalink / raw)
Christian Seberino wrote:
> is it easy to make line numbering start at 0 too?
Not sure exactly what your asking, but keep in mind that column-numbering
and line-numbering have a fundamental difference: when the cursor is on
the top-left position in the buffer, point is *on* the first line but
*before* the first character. Think of point as a line that has zero
width, but the height of a line of text.
--
Benjamin Lewis
Don't take life so serious, son, it ain't nohow permanent.
-- Walt Kelly
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: is it easy to make line numbering start at 0 too?
2003-01-08 1:57 is it easy to make line numbering start at 0 too? Christian Seberino
` (2 preceding siblings ...)
2003-01-10 23:50 ` Benjamin Lewis
@ 2003-01-11 0:10 ` Henrik Enberg
3 siblings, 0 replies; 6+ messages in thread
From: Henrik Enberg @ 2003-01-11 0:10 UTC (permalink / raw)
seberino@spawar.navy.mil (Christian Seberino) writes:
> is it easy to make line numbering start at 0 too?
No. It is hardcoded on the C level.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: is it easy to make line numbering start at 0 too?
[not found] ` <20030109131745.A31056@spawar.navy.mil>
@ 2003-01-12 16:53 ` John Paul Wallington
0 siblings, 0 replies; 6+ messages in thread
From: John Paul Wallington @ 2003-01-12 16:53 UTC (permalink / raw)
seberino@spawar.navy.mil wrote:
> Thanks for the reply! This is a very cool way to do
> the modeline modification.... I originally made column numbering
> on modeline start at 1 this way....
[...]
> (setq default-mode-line-format
[...]
> '(:eval (format "%d" (1+ (current-column))))))
> (add-hook 'post-command-hook (lambda () (force-mode-line-update)))
> This has side effects... it messed up scroll-step behavior... this is
> why I need a new way.
> A problem with hacking Emacs source code is that I can't
> make these changes happen on remote machines that I don't have root
> privileges on.
>
> Plus, it sounds like new Emacs versions may not be compatible
> with changes.
Hacking decode_mode_spec in xdisp.c as mentioned earlier is much more
straightforward than trying to replicate the same effect in emacs
lisp. XEmacs has a `column-number-start-at-one' builtin and heeds it.
If there is a genuine demand for the functionality you should propose
it to the Emacs maintainers; as demonstrated it is a simple addition.
It is controversial because presently the column and line number
displays on the modeline reflect `point' which is on a line and
between characters. The question arises as to why a user wants Emacs
to tell fibs about column/line numbers; what is wrong with column
numbers starting at zero, and line numbers at one?
--
John Paul Wallington
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2003-01-12 16:53 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2003-01-08 1:57 is it easy to make line numbering start at 0 too? Christian Seberino
2003-01-09 12:02 ` John Paul Wallington
[not found] ` <20030109131745.A31056@spawar.navy.mil>
2003-01-12 16:53 ` John Paul Wallington
2003-01-10 23:19 ` Rikard Bosnjakovic
2003-01-10 23:50 ` Benjamin Lewis
2003-01-11 0:10 ` Henrik Enberg
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