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[solved] Unsafe terminal escape sequences and ANSI codes from decryption

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On 3/6/23 03:29, Simon Tatham wrote:
> "G.K." <g@k.invalid> writes:
>> Another distinction occurs to me that might ease the problem
>> requirement. Is there a cheap way to distinguish between control codes
>> and formatting codes (color, foreground, background, underline,
>> blinkenlights) codes in a text stream.
> 
> 'less -R' does something along those lines. I don't know if the
> filtering code is conveniently separable from the rest of 'less', but
> it might be a start: somebody else has already done the work of making a
> set of decisions about which codes count in which category.

This solves the problem. This is a boon and does almost all the work 
necessary. From the less manual:

[quote]
-R or --RAW-CONTROL-CHARS
Like -r, but only ANSI "color" escape sequences are output in "raw" 
form.  Unlike -r, the screen appearance is maintained correctly in  most 
cases.  ANSI "color" escape sequences are sequences of the form:

        ESC [ ... m

where  the "..." is zero or more color specification characters For the 
purpose of keeping track of screen appearance, ANSI color escape 
sequences are assumed to not move the cursor. [/quote]

After this I can pipe through a few intelligent line length and UTF-8 
validation checks and ship it.

-- 

G.K.

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Thread

? Unsafe terminal escape sequences and ANSI codes from decryption "G.K." <g@k.invalid> - 2023-03-05 03:19 -0600
  Re: ? Unsafe terminal escape sequences and ANSI codes from decryption Grant Taylor <gtaylor@tnetconsulting.net> - 2023-03-05 09:59 -0700
  Re: ? Unsafe terminal escape sequences and ANSI codes from decryption legalize+jeeves@mail.xmission.com (Richard) - 2023-03-06 04:42 +0000
    Re: ? Unsafe terminal escape sequences and ANSI codes from decryption Jan Panteltje <alien@comet.invalid> - 2023-03-06 06:25 +0000
    Re: ? Unsafe terminal escape sequences and ANSI codes from decryption "G.K." <g@k.invalid> - 2023-03-06 01:25 -0600
      Re: ? Unsafe terminal escape sequences and ANSI codes from decryption "G.K." <g@k.invalid> - 2023-03-06 01:31 -0600
      Re: ? Unsafe terminal escape sequences and ANSI codes from decryption Simon Tatham <anakin@pobox.com> - 2023-03-06 09:29 +0000
        [solved] Unsafe terminal escape sequences and ANSI codes from decryption "G.K." <g@k.invalid> - 2023-03-06 04:04 -0600
        Re: ? Unsafe terminal escape sequences and ANSI codes from decryption Phil Carmody <pc+usenet@asdf.org> - 2023-03-07 09:36 +0200
      Re: ? Unsafe terminal escape sequences and ANSI codes from decryption legalize+jeeves@mail.xmission.com (Richard) - 2023-03-06 18:36 +0000
    Re: ? Unsafe terminal escape sequences and ANSI codes from decryption drb@ihatespam.msu.edu (Dennis Boone) - 2023-03-06 22:29 +0000
      Re: ? Unsafe terminal escape sequences and ANSI codes from decryption Grant Taylor <gtaylor@tnetconsulting.net> - 2023-03-06 17:21 -0700
        Re: ? Unsafe terminal escape sequences and ANSI codes from decryption drb@ihatespam.msu.edu (Dennis Boone) - 2023-03-07 00:35 +0000
          Re: ? Unsafe terminal escape sequences and ANSI codes from decryption Grant Taylor <gtaylor@tnetconsulting.net> - 2023-03-06 18:19 -0700
            Re: ? Unsafe terminal escape sequences and ANSI codes from decryption drb@ihatespam.msu.edu (Dennis Boone) - 2023-03-07 01:41 +0000
              Re: ? Unsafe terminal escape sequences and ANSI codes from decryption Grant Taylor <gtaylor@tnetconsulting.net> - 2023-03-06 23:35 -0700
                Re: ? Unsafe terminal escape sequences and ANSI codes from decryption Jakob Bohm <jb-usenet@wisemo.com.invalid> - 2023-03-17 14:23 +0100
        Re: ? Unsafe terminal escape sequences and ANSI codes from decryption kludge@panix.com (Scott Dorsey) - 2023-03-07 02:22 +0000
          Re: ? Unsafe terminal escape sequences and ANSI codes from decryption Grant Taylor <gtaylor@tnetconsulting.net> - 2023-03-06 23:46 -0700
            Re: ? Unsafe terminal escape sequences and ANSI codes from decryption kludge@panix.com (Scott Dorsey) - 2023-03-08 20:56 +0000
      Re: ? Unsafe terminal escape sequences and ANSI codes from decryption legalize+jeeves@mail.xmission.com (Richard) - 2023-03-07 05:37 +0000

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