Re: print color escapes

[Ray Andrews <rayandrews@xxxxxxxxxxx>]

On 01/01/2015 01:29 PM, Bart Schaefer wrote:


Excellent, the whole question boils down to this:

> }      local lc=$'\e['
>
>
> In that expression, the $'' form of quoting converts \e to ESC, which is
> why the $'' form of quoting exists in the first place (and is different
> from ordinary single quoting).  $'' is to avoid having to do something
> more expensive (fork + read output) such as lc="$(echo '\e[')".

That is a POSIX quote?  Good to see one in combat, I've only ever had 
them drawn to my attention once before.  Book lernin' no substitute for 
seeing something in action.
> The (V) flag converts ESC to ^[ because that's what most people are used
> to seeing ("visible").  The (q) flag converts to $'\e' because that's
> what people are used to writing (and because "eval ${(q)...}" needs it
> in that format).

Beautiful, these are conventions and practicalities not 'realities'.
> The print and echo commands convert \e to ESC because
> of historical practice.
But terminal will always grab ESC 'hard' will it not?  That is to say 
that no matter how you dress it up, the terminal always sees it 
verbatim.  And I'd expect that that convention is now written in stone.
> The bindkey command converts both ^[ and \e to
> ESC for maximum flexibility in writing key bindings.  All of this is
> entirely independent of what the terminal does when it sees an ESC.
Crystal clear.  Too bad there wasn't some way of upvoting an explanation 
like that were it to show up on Google eventually, cuz that's as good as 
it could be. Questions that were not even asked (but needed to be) were 
answered.

BTW too bad in some fonts '' looks almost exactly like ".