Debian Bug report logs - #800562
ncurses-term: screen terminfo is missing 'erase_chars' capstring

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Message #5 received at [email protected] (full text, mbox, reply):

From: Paul LeoNerd Evans <[email protected]>

To: Debian Bug Tracking System <[email protected]>

Subject: ncurses-term: screen terminfo is missing 'erase_chars' capstring

Date: Wed, 30 Sep 2015 23:37:37 +0100

Package: ncurses-term
Version: 6.0+20150810-1
Severity: normal
Tags: upstream

The `screen` program has the ability to perform the 'erase_chars'
behaviour, using an ECMA-48-standard CSI X; for example:

  $ echo -e "ABCDEF\e[3G\e[2X"
  AB  EF

correctly erases the 2 chars in the middle when run via screen.

However, the `screen` terminfo file fails to include the `erase_chars`
capstring:

  $ infocmp -L1 screen | grep erase_chars
  <no output>

as compared other terms that do; for example:

  $ infocmp -L1 xterm | grep erase_chars
          erase_chars=\E[%p1%dX,

This capstring should be added to the screen terminfo. (and likewise
screen-bce, screen-256color, screen-256color-bce)


-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

-- no debconf information

Message #10 received at [email protected] (full text, mbox, reply):

From: Thomas Dickey <[email protected]>

To: [email protected]

Cc: [email protected]

Subject: Re: Bug#800562: ncurses-term: screen terminfo is missing 'erase_chars' capstring

Date: Wed, 30 Sep 2015 20:36:19 -0400

[Message part 1 (text/plain, inline)]

On Wed, Sep 30, 2015 at 11:37:37PM +0100, Paul LeoNerd Evans wrote:
> Package: ncurses-term
> Version: 6.0+20150810-1
> Severity: normal
> Tags: upstream
> 
> The `screen` program has the ability to perform the 'erase_chars'
> behaviour, using an ECMA-48-standard CSI X; for example:
> 
>   $ echo -e "ABCDEF\e[3G\e[2X"
>   AB  EF
> 
> correctly erases the 2 chars in the middle when run via screen.

maybe/maybe not: there are a few descriptions where ECH is not used
because the terminal's treatment of bce differs from that used in ncurses.

I can investigate it (again)...

-- 
Thomas E. Dickey <[email protected]>
http://invisible-island.net
ftp://invisible-island.net

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Message #18 received at [email protected] (full text, mbox, reply):

From: Thomas Dickey <[email protected]>

To: [email protected]

Cc: [email protected]

Subject: Re: Bug#800562: ncurses-term: screen terminfo is missing 'erase_chars' capstring

Date: Sat, 10 Oct 2015 14:29:09 -0400

[Message part 1 (text/plain, inline)]

On Wed, Sep 30, 2015 at 08:36:19PM -0400, Thomas Dickey wrote:
> On Wed, Sep 30, 2015 at 11:37:37PM +0100, Paul LeoNerd Evans wrote:
> > Package: ncurses-term
> > Version: 6.0+20150810-1
> > Severity: normal
> > Tags: upstream
> > 
> > The `screen` program has the ability to perform the 'erase_chars'
> > behaviour, using an ECMA-48-standard CSI X; for example:
> > 
> >   $ echo -e "ABCDEF\e[3G\e[2X"
> >   AB  EF
> > 
> > correctly erases the 2 chars in the middle when run via screen.
> 
> maybe/maybe not: there are a few descriptions where ECH is not used
> because the terminal's treatment of bce differs from that used in ncurses.

In a quick check, vttest screen 11.6.5 shows the problem I mentioned.
	Test BCE-style clear line/display (ECH, Indexing)

-- 
Thomas E. Dickey <[email protected]>
http://invisible-island.net
ftp://invisible-island.net

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