bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Joost Kremers]

`csv-mode` has the option to display a header line so you can make column names 
permanently visible, which is a very nice option. However, when 
`display-line-numbers-mode` is active, the column names do not line up with the 
actual columns, because the header line does not take into account the space 
taken up by the line numbers.

I posted this on emacs-devel:
<https://lists.gnu.org/archive/html/emacs-devel/2022-04/msg01308.html>

Eli Zaretskii suggested this can be fixed by doing something similar to what
tabulated-list-mode does. I'm not sure I'll find time to dive into that any time
soon, so I'm posting here to make sure the issue isn't forgotten.

Joost




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-- 
Joost Kremers
Life has its moments

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Lars Ingebrigtsen]

Joost Kremers <joostkremers@fastmail.fm> writes:

> Eli Zaretskii suggested this can be fixed by doing something similar
> to what tabulated-list-mode does. I'm not sure I'll find time to dive
> into that any time soon, so I'm posting here to make sure the issue
> isn't forgotten.

I had a look at what tabulated-list-mode does, and it's a lot of code.
(And it doesn't really work well -- toggling the line numbers on and
then off again doesn't restore the column names).

I'm surprised that that's necessary -- surely
`display-line-numbers-mode' should itself fix up the header line?  That
is, there should be a header line format construct that modes can add to
the front of `header-line-format' that's controlled by
`display-line-numbers-mode'.

Eli, does this sound like a plan to you?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 55387@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>
> Date: Fri, 13 May 2022 14:52:21 +0200
> 
> I'm surprised that that's necessary -- surely
> `display-line-numbers-mode' should itself fix up the header line?  That
> is, there should be a header line format construct that modes can add to
> the front of `header-line-format' that's controlled by
> `display-line-numbers-mode'.
> 
> Eli, does this sound like a plan to you?

I don't think I understand how this could work.  The line-number width
is not fixed, it changes dynamically as needed.  How would the
header-line adapt itself, except in some hook that is called by
redisplay?

Also, display-line-numbers-mode is not really a mode, in the sense
that there's no mode-specific code anywhere.  It's basically a
variable that tells redisplay to do or not do something.  So I don't
think I understand how can this "mode" control anything?

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> I don't think I understand how this could work.  The line-number width
> is not fixed, it changes dynamically as needed.  How would the
> header-line adapt itself, except in some hook that is called by
> redisplay?

header-line-format would look like

(display-line-spaces <the rest>)

where display-line-spaces would indeed be updated by the redisplay code
(to be of the same length as (line-number-display-width 'columns)).

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: joostkremers@fastmail.fm,  55387@debbugs.gnu.org
> Date: Fri, 13 May 2022 15:41:50 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I don't think I understand how this could work.  The line-number width
> > is not fixed, it changes dynamically as needed.  How would the
> > header-line adapt itself, except in some hook that is called by
> > redisplay?
> 
> header-line-format would look like
> 
> (display-line-spaces <the rest>)
> 
> where display-line-spaces would indeed be updated by the redisplay code
> (to be of the same length as (line-number-display-width 'columns)).

This last bit is what I don't understand.  Redisplay code works one
screen line at a time, and it does that from the highest line to the
lowest line ("highest" and "lowest" don't necessarily mean the first
and the last visible lines in a window, they could mean line number N
and line number M, where N <= M).  When (and if) it displays the
header-line, it doesn't yet know that the lines showing text will need
a wider line-number display; it will know that only when it works on
the first screen line of text it was asked to display.  And when it
displays a screen line of text, it doesn't consider
header-line-format, not even whether the window has a header-line.

Moreover, the code which produces the line-numbers can be called when
the line doesn't need to be displayed at all, only its metrics
measured, for some job related to layout of text.  In this case, it
would be unthinkable to modify the header-line as a side effect,
because no one expects the header-line to be updated on display when,
say, the user presses C-n in the middle of a window.

So again, I don't understand how this can work.

This is why we have hooks that redisplay calls in strategic places,
and tabulated-list.el uses them to update the header-line.  Why isn't
that a better way?

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Eli Zaretskii]

> Cc: joostkremers@fastmail.fm, 55387@debbugs.gnu.org
> Date: Fri, 13 May 2022 17:12:03 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> > header-line-format would look like
> > 
> > (display-line-spaces <the rest>)
> > 
> > where display-line-spaces would indeed be updated by the redisplay code
> > (to be of the same length as (line-number-display-width 'columns)).

Btw, isn't it true that the problem is not in displaying the
header-line, but in adjusting the alignment of the _body_ of the table
to the changes in header-line (which happen automatically)?  In which
case how will header-line construct help?

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Eli Zaretskii]

> Resent-From: Eli Zaretskii <eliz@gnu.org>
> Original-Sender: "Debbugs-submit" <debbugs-submit-bounces@debbugs.gnu.org>
> Resent-CC: bug-gnu-emacs@gnu.org
> Resent-Sender: help-debbugs@gnu.org
> Cc: joostkremers@fastmail.fm, 55387@debbugs.gnu.org
> Date: Fri, 13 May 2022 17:20:43 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> > Cc: joostkremers@fastmail.fm, 55387@debbugs.gnu.org
> > Date: Fri, 13 May 2022 17:12:03 +0300
> > From: Eli Zaretskii <eliz@gnu.org>
> > 
> > > header-line-format would look like
> > > 
> > > (display-line-spaces <the rest>)
> > > 
> > > where display-line-spaces would indeed be updated by the redisplay code
> > > (to be of the same length as (line-number-display-width 'columns)).
> 
> Btw, isn't it true that the problem is not in displaying the
> header-line, but in adjusting the alignment of the _body_ of the table
> to the changes in header-line (which happen automatically)?  In which
> case how will header-line construct help?

So looking at cvs-mode.el, I conclude that I don't really understand
the problem.  It seems to use :align-to display spec to align columns
in the body of the table, which should keep the alignment when
line-numbers are turned on and off, so is the problem with the
header-line after all?  If so, why isn't just using
line-number-display-width when calculating the header-line-format good
enough?

Perhaps Joost could describe the problem in more detail?

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> Moreover, the code which produces the line-numbers can be called when
> the line doesn't need to be displayed at all, only its metrics
> measured, for some job related to layout of text.  In this case, it
> would be unthinkable to modify the header-line as a side effect,
> because no one expects the header-line to be updated on display when,
> say, the user presses C-n in the middle of a window.
>
> So again, I don't understand how this can work.

I don't really understand your point here, so I'm probably
misunderstanding something fundamental.  My thought was just that the
thing that produces the line number would set a
line-number-width/columns variable.  When redisplay formats the header
line (whenever it wants to do that), that variable would be set, so it
would just render it in the totally normal way.

> This is why we have hooks that redisplay calls in strategic places,
> and tabulated-list.el uses them to update the header-line.  Why isn't
> that a better way?

Because this affects all modes that have a columnar layout and uses a
header line.

> Btw, isn't it true that the problem is not in displaying the
> header-line, but in adjusting the alignment of the _body_ of the table
> to the changes in header-line (which happen automatically)?  In which
> case how will header-line construct help?

The header line isn't adjusted automatically by display-line-number-mode.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: joostkremers@fastmail.fm,  55387@debbugs.gnu.org
> Date: Fri, 13 May 2022 17:52:11 +0200
> 
> I don't really understand your point here, so I'm probably
> misunderstanding something fundamental.  My thought was just that the
> thing that produces the line number would set a
> line-number-width/columns variable.

There's no such variable.  line-number-display-width is a function, it
computes the result anew when called.

> > Btw, isn't it true that the problem is not in displaying the
> > header-line, but in adjusting the alignment of the _body_ of the table
> > to the changes in header-line (which happen automatically)?  In which
> > case how will header-line construct help?
> 
> The header line isn't adjusted automatically by display-line-number-mode.

Does the problem happen only when display-line-number-mode is turned
on or off?  Or does it happen on other occasions, and if so, which
ones?

And what triggers recalculation of the header-line-format in this
mode?  That trigger is different between different users of modes like
this one, so coming up with a one-fits-all solution is not easy, if at
all possible.

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> I don't really understand your point here, so I'm probably
>> misunderstanding something fundamental.  My thought was just that the
>> thing that produces the line number would set a
>> line-number-width/columns variable.
>
> There's no such variable.  line-number-display-width is a function, it
> computes the result anew when called.

I know.  We would introduce such a variable and (offer to) use it in
header-line-mode.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: joostkremers@fastmail.fm,  55387@debbugs.gnu.org
> Date: Fri, 13 May 2022 18:04:08 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> I don't really understand your point here, so I'm probably
> >> misunderstanding something fundamental.  My thought was just that the
> >> thing that produces the line number would set a
> >> line-number-width/columns variable.
> >
> > There's no such variable.  line-number-display-width is a function, it
> > computes the result anew when called.
> 
> I know.  We would introduce such a variable and (offer to) use it in
> header-line-mode.

That's impossible, because the value depends on the buffer position.

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> I know.  We would introduce such a variable and (offer to) use it in
>> header-line-mode.
>
> That's impossible, because the value depends on the buffer position.

We only care about the value of the first (displayed) line after the
header line, so the new variable would only be updated when we're
computing that line.  I.e., line 1.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> We only care about the value of the first (displayed) line after the
> header line, so the new variable would only be updated when we're
> computing that line.  I.e., line 1.

(Visual line 1 in the window, of course, not the buffer line 1...)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Lars Ingebrigtsen]

On the other hand, factoring out the code in tabulated-list.el into its
own little minor mode -- say, `header-line-indent-mode' -- looks like it
would be pretty easy, and not involve any complicated state, too.  (It
just runs off of pre-redisplay-functions/window-scroll-functions.)

As a bonus it doesn't require that that modes change their
header-line-format variables, I think.

I'll take a stab at doing that.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> I'll take a stab at doing that.

I've now done this, and used the new mode in csv-mode (if you're running
a new Emacs).

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: joostkremers@fastmail.fm,  55387@debbugs.gnu.org
> Date: Fri, 13 May 2022 21:48:11 +0200
> 
> Lars Ingebrigtsen <larsi@gnus.org> writes:
> 
> > I'll take a stab at doing that.
> 
> I've now done this, and used the new mode in csv-mode (if you're running
> a new Emacs).

So does this mean the original problem is now solved?  Because at some
point you said that tabulated-list-mode didn't work correctly when
display-line-numbers-mode was toggled or something?

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> So does this mean the original problem is now solved?  Because at some
> point you said that tabulated-list-mode didn't work correctly when
> display-line-numbers-mode was toggled or something?

It didn't, but I fixed that bug.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: joostkremers@fastmail.fm,  55387@debbugs.gnu.org
> Date: Sat, 14 May 2022 13:28:43 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > So does this mean the original problem is now solved?  Because at some
> > point you said that tabulated-list-mode didn't work correctly when
> > display-line-numbers-mode was toggled or something?
> 
> It didn't, but I fixed that bug.

Thanks.

bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: joostkremers@fastmail.fm,  55387@debbugs.gnu.org
> Date: Fri, 13 May 2022 19:40:34 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> I know.  We would introduce such a variable and (offer to) use it in
> >> header-line-mode.
> >
> > That's impossible, because the value depends on the buffer position.
> 
> We only care about the value of the first (displayed) line after the
> header line, so the new variable would only be updated when we're
> computing that line.  I.e., line 1.

Maybe in this particular mode, but it isn't always true.

And I don't really understand what will such a variable solve.  If
some Lisp program can use a value of a variable, it can also call a
function and use its return value, no?

(In any case, we cannot provide a simple variable, because the value
depends on the window -- if the same buffer is displayed in several
windows, the value could be different in each one of those windows.)