sending escape sequences to print in color

sending escape sequences to print in color

[Eric Smith]

How do I print (shell builtin) or scho or better still write (1)
to screen and produce color characters or inverse video.

Apologies if there is no zsh relevance to this question.

-- 
Eric Smith

Re: sending escape sequences to print in color

[Dan Nelson]

In the last episode (Mar 24), Eric Smith said:
> How do I print (shell builtin) or scho or better still write (1)
> to screen and produce color characters or inverse video.

echotc AF 6 ; echotc AB 4 ; echo "Cyan on Blue!"

-- 
	Dan Nelson
	dnelson@allantgroup.com

Re: sending escape sequences to print in color

[Stephane CHAZELAS]

On Mon, Mar 24, 2003 at 03:40:51PM -0600, Dan Nelson wrote:
> In the last episode (Mar 24), Eric Smith said:
> > How do I print (shell builtin) or scho or better still write (1)
> > to screen and produce color characters or inverse video.
> 
> echotc AF 6 ; echotc AB 4 ; echo "Cyan on Blue!"

Or 
autoload colors
colors

print "$bg[cyan]$fg[blue]Blue on Cyan!"

-- 
Stéphane

Re: sending escape sequences to print in color - thanks

[Eric Smith]

Stephane CHAZELAS said:
> On Mon, Mar 24, 2003 at 03:40:51PM -0600, Dan Nelson wrote:
> > In the last episode (Mar 24), Eric Smith said:
> > > How do I print (shell builtin) or scho or better still write (1)
> > > to screen and produce color characters or inverse video.
> > 
> > echotc AF 6 ; echotc AB 4 ; echo "Cyan on Blue!"
> 
> Or 
> autoload colors
> colors
> 
> print "$bg[cyan]$fg[blue]Blue on Cyan!"
> 

Thanks for both - nice to know and to use - great!

But one use I was looking for was to write(1) to another terminal viz.
echotc AF 6 ; echotc AB 4 ; echo "Cyan on Blue"|write eric /dev/pts/3
or 
print "$bg[cyan]$fg[blue]Blue on Cyan"|write eric /dev/pts/3

but alas no colors on the destination terminal (of course this does not prove
it but trust me):
[eric@pear ~] 3 $
Message from eric@pear on pts/2 at 22:48 ...
Cyan on Blue
EOF

Message from eric@pear on pts/4 at 22:52 ...
^[[46m^[[34mBlue on Cyan
EOF


oops - this just came in (same issue):

print "\e[3${i}mFred $i here\e[0m"|write eric /dev/pts/3

Message from eric@pear on pts/4 at 22:56 ...
^[[3mFred  here^[[0m
EOF

Perhaps I am being greedy - I learnt a great new trick today.

Thanks guys ...

-- 
Eric Smith

Re: sending escape sequences to print in color - thanks

[Geoff Wing]

Eric Smith <es@fruitcom.com> typed:
: But one use I was looking for was to write(1) to another terminal viz.
: echotc AF 6 ; echotc AB 4 ; echo "Cyan on Blue"|write eric /dev/pts/3
: or 
: print "$bg[cyan]$fg[blue]Blue on Cyan"|write eric /dev/pts/3

Generally you can't use write because most write programmes make control
characters visible, so escape will become the two characters ^ and [

However, on a local machine you may be able to do
% print "$bg[cyan]$fg[blue]Blue on Cyan" >> /dev/pts/3

Regards,
Geoff

Re: sending escape sequences to print in color - thanks

[Stephane CHAZELAS]

On Mon, Mar 24, 2003 at 10:58:36PM +0100, Eric Smith wrote:
[...]
> But one use I was looking for was to write(1) to another terminal viz.
> echotc AF 6 ; echotc AB 4 ; echo "Cyan on Blue"|write eric /dev/pts/3
> or 
> print "$bg[cyan]$fg[blue]Blue on Cyan"|write eric /dev/pts/3
> 
> but alas no colors on the destination terminal (of course this does not prove
> it but trust me):
> [eric@pear ~] 3 $
> Message from eric@pear on pts/2 at 22:48 ...
> Cyan on Blue
> EOF
> 
> Message from eric@pear on pts/4 at 22:52 ...
> ^[[46m^[[34mBlue on Cyan
> EOF
[...]

Be glad you can't. Some of such control sequences can serve to
put the remote terminal in an alternate charset or resize the
window to null, or iconify it or change the font to unreadable
or even in some versions of rxvt to run arbitrary commands!

-- 
Stéphane

Re: sending escape sequences to print in color

[Thorsten Kampe]

* Stephane CHAZELAS (03-03-24 22:52 +0100)
> On Mon, Mar 24, 2003 at 03:40:51PM -0600, Dan Nelson wrote:
>> In the last episode (Mar 24), Eric Smith said:
>>> How do I print (shell builtin) or scho or better still write (1)
>>> to screen and produce color characters or inverse video.
>> 
>> echotc AF 6 ; echotc AB 4 ; echo "Cyan on Blue!"

I love the manual: "Output the termcap value corresponding to the 
capability cap".
 
> Or 
> autoload colors
> colors

I don't have to do this, perhaps because of "autoload -U promptinit ; 
promptinit"? Any way to verify this?
 
> print "$bg[cyan]$fg[blue]Blue on Cyan!"

Time for me to unset the default "banghist" option.


Thorsten
-- 
 Content-Type: text/explicit; charset=ISO-8859-666 (Parental Advisory)
 Content-Transfer-Warning: message contains innuendos not suited for
 children under the age of 18

Re: sending escape sequences to print in color

[Phil Gregory]

* Dan Nelson <dnelson@allantgroup.com> [2003-03-24 15:40 -0600]:
> echotc AF 6 ; echotc AB 4 ; echo "Cyan on Blue!"

I didn't know about the existence of echotc; cool.  But I prefer
terminfo names (they're barely more mnemonic, at least).  Why doesn't
echoti take arguments?  (That's the only thing I'd use it for--simpler
to use the associative array for static strings.)

-- 
phil_g@pobox.com / phil! / DNRC / http://www.geeksimplex.org/phil/
PGP:  ID: D8C75CF5  print: 0A7D B3AD 2D10 1099  7649 AB64 04C2 05A6
--- --
Statistics means never having to say you're certain.
---- --- --

Re: sending escape sequences to print in color

[Clint Adams]

> I didn't know about the existence of echotc; cool.  But I prefer
> terminfo names (they're barely more mnemonic, at least).  Why doesn't
> echoti take arguments?  (That's the only thing I'd use it for--simpler
> to use the associative array for static strings.)

With the following patch, you'll be able to do
echoti setaf 4
or whatnot.

Index: Src/Modules/terminfo.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Modules/terminfo.c,v
retrieving revision 1.19
diff -u -r1.19 terminfo.c
--- Src/Modules/terminfo.c	7 Oct 2002 11:48:08 -0000	1.19
+++ Src/Modules/terminfo.c	25 Mar 2003 05:21:51 -0000
@@ -59,8 +59,8 @@
 static int
 bin_echoti(char *name, char **argv, Options ops, int func)
 {
-    char *s, *t;
-    int num;
+    char *s, *t, *u;
+    int num, argct;
 
     s = *argv++;
     /* This depends on the termcap stuff in init.c */
@@ -92,9 +92,28 @@
 	zwarnnam(name, "no such terminfo capability: %s", s, 0);
 	return 1;
     }
-
-    tputs(t, 1, putchar);
+    /* count the number of arguments required */
+    for (argct = 0, u = t; *u; u++)
+        if (*u == '%') {
+            if (u++, (*u == 'd' || *u == '2' || *u == '3' || *u == '.' ||
+                      *u == '+'))
+                argct++;
+        }
+    /* check that the number of arguments provided is correct */
+    if (arrlen(argv) != argct) {
+        zwarnnam(name, (arrlen(argv) < argct) ? "not enough arguments" :
+                 "too many arguments", NULL, 0);
+        return 1;
+    }
+    /* output string, through the proper termcap functions */
+    if (!argct)
+        tputs(t, 1, putraw);
+    else {
+        num = (argv[1]) ? atoi(argv[1]) : atoi(*argv);
+        tputs(tparm(t, atoi(*argv)), num, putraw);
+    }
     return 0;
+
 }
 
 /**/