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From: Ivan Shmakov on 19 Nov 2009 16:41
>>>>> "IS" == Ivan Shmakov <ivan(a)main.uusia.org> writes:

[...]

IS> Ncurses comes with tput(1) bundled. I'm not sure how widely it is
IS> available.

[...]

... And tput(1), together with Bash arrays, allows, e. g., the
following display hack to be implemented. (I wished to code it
for a while...)

#!/bin/bash

cleanup () {
trap EXIT
reset
}

trap cleanup EXIT

set_place () {
local i="$1" cols rows
if [ -z "${row[$i]}" -o -z "${col[$i]}" ] ; then
cols=$(tput cols)
rows=$(tput lines)
row[$i]=$((1 + $RANDOM % ($rows - 1)))
col[$i]=$((1 + $RANDOM % ($cols - 1)))
fi
## .
tput cup "${row[$i]}" "${col[$i]}"
}

set_color () {
local i="$1"
if [ -z "${color[$i]}" ] ; then
color[$i]=$((1 + $RANDOM % 15))
fi
## .
tput setaf "${color[$i]}"
}

new_char_p () {
local i="$1" new
if [ -n "${small[$i]}" ] ; then
case "${ttl[$i]}" in
(0) new=' ' ;;
(1) new='.' ;;
(2) new='*' ;;
(*) new='.' ;;
esac
else
case "${ttl[$i]}" in
([0]) new=' ' ;;
([1-2]) new=. ;;
([3-5]) new=o ;;
([6-7]) new=O ;;
([8-9]) new=o ;;
(*) new=. ;;
esac
fi
## .
test "$new" != "${char[$i]}" \
&& char[$i]=$new
}

put_char () {
local i="$1"
printf %s\\b "${char[$i]}"
}

max=17

update_create_new () {
local i
i=0
while [ "$i" -lt "$max" ] ; do
i=$((1 + $i))
if [ -n "${ttl[$i]}" ] ; then
continue
fi
ttl[$i]=$((13 + $RANDOM % 71))
if [ $(($RANDOM % 7)) -lt 5 ] ; then
small[$i]=1
fi
done
}

update_evolve () {
local i
i=0
while [ "$i" -lt "$max" ] ; do
i=$((1 + $i))
if [ -z "${ttl[$i]}" ] ; then
continue
fi
ttl[$i]=$((-1 + ${ttl[$i]}))
if new_char_p "$i" ; then
set_place "$i"
set_color "$i"
put_char "$i"
fi
done
}

update_remove_old () {
local i
i=0
while [ "$i" -lt "$max" ] ; do
i=$((1 + $i))
if [ -z "${ttl[$i]}" ] ; then
continue
fi
if [ "${ttl[$i]}" -le 0 ] ; then
ttl[$i]=
row[$i]=
col[$i]=
color[$i]=
char[$i]=
small[$i]=
fi
done
}

update () {
update_create_new
update_evolve
update_remove_old
}

tput civis
clear
while sleep .1s ; do
update
done

--
FSF associate member #7257
From: Chris F.A. Johnson on 19 Nov 2009 17:06
On 2009-11-19, Ivan Shmakov wrote:
>>>>>> "IS" == Ivan Shmakov <ivan(a)main.uusia.org> writes:
>
> [...]
>
> IS> Ncurses comes with tput(1) bundled. I'm not sure how widely it is
> IS> available.
>
> [...]
>
> ... And tput(1), together with Bash arrays, allows, e. g., the
> following display hack to be implemented. (I wished to code it
> for a while...)

It doesn't work everywhere. On some systems, the following does
nothing:

> tput setaf "${color[$i]}"

--
Chris F.A. Johnson, author <http://shell.cfajohnson,com/>
===================================================================
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
===== My code in this post, if any, assumes the POSIX locale =====
===== and is released under the GNU General Public Licence =====
From: Thomas Dickey on 19 Nov 2009 20:17
On Nov 19, 5:06 pm, "Chris F.A. Johnson" <cfajohn...(a)gmail.com> wrote:
> On 2009-11-19, Ivan Shmakov wrote:
....
> > IS>Ncursescomes with tput(1) bundled.  I'm not sure how widely it is
> > IS> available.
....
> >    ... And tput(1), together with Bash arrays, allows, e. g., the
> >    following display hack to be implemented.  (I wished to code it
> >    for a while...)
>
>     It doesn't work everywhere. On some systems, the following does
>     nothing:
>
> >     tput setaf "${color[$i]}"

er - you're responding to his comment in a misleading manner.

It's unlikely that he's using bash on a system where ncurses
and tput wouldn't work as suggested, unless of course he uses
a tput that doesn't come bundled with ncurses.

awai

--
Thomas E. Dickey <dickey(a)invisible-island.net>
http://invisible-island.net
ftp://invisible-island.net
From: Chris F.A. Johnson on 19 Nov 2009 20:46
On 2009-11-20, Thomas Dickey wrote:
> On Nov 19, 5:06?pm, "Chris F.A. Johnson" <cfajohn...(a)gmail.com> wrote:
>> On 2009-11-19, Ivan Shmakov wrote:
> ...
>> > IS>Ncursescomes with tput(1) bundled. ?I'm not sure how widely it is
>> > IS> available.
> ...
>> > ? ?... And tput(1), together with Bash arrays, allows, e. g., the
>> > ? ?following display hack to be implemented. ?(I wished to code it
>> > ? ?for a while...)
>>
>> ? ? It doesn't work everywhere. On some systems, the following does
>> ? ? nothing:
>>
>> > ? ? tput setaf "${color[$i]}"
>
> er - you're responding to his comment in a misleading manner.
>
> It's unlikely that he's using bash on a system where ncurses
> and tput wouldn't work as suggested, unless of course he uses
> a tput that doesn't come bundled with ncurses.

I use bash on at least one system where it doesn't work. I have no
idea what, if anything, it was bundled with. I've used many more
such systems in the past.

While there are a few terminals (or emulators) that do not conform
for the most part to the ISO 6429 standard, the vast majority do.
If a terminal doesn't conform, that's a good-enough reason not to
use it. I have found it far closer to universal than either
version of tput.

--
Chris F.A. Johnson, author <http://shell.cfajohnson,com/>
===================================================================
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
===== My code in this post, if any, assumes the POSIX locale =====
===== and is released under the GNU General Public Licence =====
From: Ivan Shmakov on 19 Nov 2009 22:32
>>>>> "CFAJ" == Chris F A Johnson <cfajohnson(a)gmail.com> writes:
>>>>> "IS" Ivan Shmakov wrote:

IS> Ncurses comes with tput(1) bundled. I'm not sure how widely it is
IS> available.

[...]

CFAJ> It doesn't work everywhere. On some systems, the following does
CFAJ> nothing:

> tput setaf "${color[$i]}"

I've meant ``a fully-working tput(1)'' by ``it'' specifically in
the sentence above.

My Shell experience was limited mostly to GNU/Linux systems, and
would /it/ fail on one under my rule, I'd immediately suspect a
problem with the terminfo(5) database to be reported to the
developers in charge.

--
FSF associate member #7257
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