bug#61396: diff mode could distinguish changed from deleted lines

[Samuel Wales]

this is a bug against emacs diff-mode.

diff is not responsible for diff-mode colors.  diff-mode is.


On 2/11/23, Juri Linkov <juri@linkov.net> wrote:
>> i think it is in diff-mode in emacs, at least when it is displaying diff
>> -u.
>>
>> in particular, the idea is whether it can be solved using emacs
>> features such as faces.
>>
>> it is true that diff and friends can often do colors, but to my
>> knowledge, diff-mode uses raw text as its input.
>
> But diff has no color for changed lines, only for added/removed lines:
>
> '--palette=PALETTE'
>      Specify what color palette to use when colored output is enabled.
>      It defaults to 'rs=0:hd=1:ad=32:de=31:ln=36' for red deleted lines,
>      green added lines, cyan line numbers, bold header.
>
>      Supported capabilities are as follows.
>
>      'ad=32'
>           SGR substring for added lines.  The default is green foreground.
>
>      'de=31'
>           SGR substring for deleted lines.  The default is red foreground.
>
>      'hd=1'
>           SGR substring for chunk header.  The default is bold foreground.
>
>      'ln=36'
>           SGR substring for line numbers.  The default is cyan foreground.
>


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