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patch 9.0.1827: xxd: no color support

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Problem:  xxd: no color support
Solution: Add color support using xxd -R

Add some basic color support for xxd

The hex-value and value are both colored with the same color depending
on the hex-value, e.g.:

    0x00 = white
    0xff = blue
    printable = green
    non-printable = red
    tabs and linebreaks = yellow

Each character needs 11 more bytes to contain color. (Same color in a
row could contain only one overhead but the logic how xxd creates colums
must be then changed.) Size of colored output is increased by factor of
~6. Also grepping the output will break when colors is used.

Flag for color is "-R", because less uses "-R".

Color uses parameters auto,always,never same as less and grep (among
others).

E.g.

xxd -R always $FILE | less -R

Add some screen-tests (that currently on work on linux) to verify the
feature works as expected.

closes: #12131

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Aapo Rantalainen <aapo.rantalainen@gmail.com>
This commit is contained in:
Aapo Rantalainen
2023-08-31 17:58:13 +02:00
committed by Christian Brabandt
parent 0b8b145bf8
commit e2528ae111
7 changed files with 428 additions and 28 deletions
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6
runtime/doc/xxd.1
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@ -135,6 +135,12 @@ to read plain hexadecimal dumps without line number information and without a
particular column layout. Additional whitespace and line breaks are allowed
anywhere.
.TP
.IR \-R " "[WHEN]
In output the hex-value and the value are both colored with the same color depending on the hex-value. Mostly helping to differentiate printable and non-printable characters.
.I WHEN
is
.BR never ", " always ", or " auto .
.TP
.I \-seek offset
When used after
.IR \-r :