linux-kernel - Re: [patch] console

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Date:   Mon, 17 Jan 2022 18:30:55 +0100
From:   "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
To:     nick black <dankamongmen@...il.com>, linux-man@...r.kernel.org
Cc:     Michael Kerrisk <mtk.manpages@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [patch] console_codes.4: ffix

Hello nick,

On 1/14/22 07:48, nick black wrote:
> Fix up the busted OSC command list (reset palette and
> set palette). Remove CSI prefix from the list of non-CSI
> escapes. End all items of said list with periods,
> matching other sections of the page.
> 
> Signed-off-by: nick black <nickblack@...ux.com>
> ---
>   man4/console_codes.4 | 22 +++++++++++-----------
>   1 file changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git man4/console_codes.4 man4/console_codes.4
> index d549b76a9..001de1955 100644
> --- man4/console_codes.4
> +++ man4/console_codes.4
> @@ -139,29 +139,28 @@ T}
>   ESC 8	DECRC	T{
>   Restore state most recently saved by ESC 7.
>   T}
> -ESC [	CSI	Control sequence introducer

As I understand it, it's there because CSI is not a CSI-prefixed 
sequence (i.e., you have to first document CSI itself, and then in a 
different list you can document sequences prefixed by CSI).
So I'd say it belongs there.

>   ESC %		Start sequence selecting character set
>   ESC % @		\0\0\0Select default (ISO 646 / ISO 8859-1)
>   ESC % G		\0\0\0Select UTF-8
>   ESC % 8		\0\0\0Select UTF-8 (obsolete)
>   ESC # 8	DECALN	T{
> -DEC screen alignment test \- fill screen with E's
> +DEC screen alignment test \- fill screen with E's.
>   T}
>   ESC (		T{
>   Start sequence defining G0 character set
>   (followed by one of B, 0, U, K, as below)
>   T}
>   ESC ( B		T{
> -Select default (ISO 8859-1 mapping)
> +Select default (ISO 8859-1 mapping).
>   T}
>   ESC ( 0		T{
> -Select VT100 graphics mapping
> +Select VT100 graphics mapping.
>   T}
>   ESC ( U		T{
> -Select null mapping \- straight to character ROM
> +Select null mapping \- straight to character ROM.
>   T}
>   ESC ( K		T{
> -Select user mapping \- the map that is loaded by the utility \fBmapscrn\fP(8)
> +Select user mapping \- the map that is loaded by the utility \fBmapscrn\fP(8).
>   T}
>   ESC )		T{
>   Start sequence defining G1 (followed by one of B, 0, U, K, as above).
> @@ -169,12 +168,13 @@ T}
>   ESC >	DECPNM	Set numeric keypad mode
>   ESC =	DECPAM	Set application keypad mode
>   ESC ]	OSC	T{
> -(Should be: Operating system command)
> -ESC ] P \fInrrggbb\fP: set palette, with parameter
> -given in 7 hexadecimal digits after the final P :-(.
> -Here \fIn\fP is the color (0\(en15), and \fIrrggbb\fP indicates
> +Operating System Command prefix.
> +T}
> +ESC ] R		Reset palette.
> +ESC ] P		T{
> +Set palette, with parameter given in 7 hexadecimal digits \fInrrggbb\fP after
> +the final P. Here \fIn\fP is the color (0\(en15), and \fIrrggbb\fP indicates
>   the red/green/blue values (0\(en255).
> -ESC ] R: reset palette

Regarding this, I don't know what the intention of the original author was.

The pre-git code was (man-pages-1.70):

```
ESC ( U		\0\0\0Select null mapping \- straight to character ROM
ESC ( K		\0\0\0Select user mapping \- the map that is loaded by
		\0\0\0the utility \fBmapscrn\fP(8).
ESC )		Start sequence defining G1
		(followed by one of B, 0, U, K, as above).
ESC >	DECPNM	Set numeric keypad mode
ESC =	DECPAM	Set application keypad mode
ESC ]	OSC	(Should be: Operating system command)
		ESC ] P \fInrrggbb\fP: set palette, with parameter
		given in 7 hexadecimal digits after the final P :-(.
		Here \fIn\fP is the color (0-15), and \fIrrggbb\fP indicates
		the red/green/blue values (0-255).
		ESC ] R: reset palette
.TE
.SS "ECMA-48 CSI sequences"
```

Maybe it should go into a separate subsection called "Operating system 
commands"?


Thanks,

Alex


-- 
Alejandro Colomar
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/