* A function to display message under the prompt without zle active
@ 2019-06-22 17:17 Sebastian Gniazdowski
2019-06-22 17:45 ` Roman Perepelitsa
0 siblings, 1 reply; 6+ messages in thread
From: Sebastian Gniazdowski @ 2019-06-22 17:17 UTC (permalink / raw)
To: Zsh Users
Hello,
I've forged as I think an interesting function, which will display
given message under the prompt regardless if ran from within zle or
not. It uses the exec <(...) / zle -F trick to dispatch a callback
that does have the zle active (zle -F -w isn't needed, zle -M works
fine from no-widget callback):
# deploy-message Hello world
# deploy-message @sleep:5.5 "Hello world"
deploy-message() {
[[ "$1" = <-> && ${#} -eq 1 ]] && { zle && {
local alltext text IFS=$'\n' nl=$'\n'
repeat 25; do read -u"$1" text; alltext+="${text:+$text$nl}"; done
[[ -n "$alltext" ]] && zle -M "$alltext"
}
zle -F "$1"; exec {1}<&-
return 0
}
local THEFD
# The expansion is: if there is @sleep: pfx, then use what's after
# it, otherwise substitute 0
exec {THEFD} < <(LANG=C sleep $(( 0.01 +
${${${(M)1#@sleep:}:+${1#@sleep:}}:-0} )); print -r --
${1:#(@msg|@sleep:*)} "${@[2,-1]}")
zle -F "$THEFD" -deploy-message
}
There's a gist with the function as well, in case of any updates:
https://gist.github.com/psprint/b6503c0c37de483f68d055e9c47981b3
--
Sebastian Gniazdowski
News: https://twitter.com/ZdharmaI
IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
Blog: http://zdharma.org
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: A function to display message under the prompt without zle active
2019-06-22 17:17 A function to display message under the prompt without zle active Sebastian Gniazdowski
@ 2019-06-22 17:45 ` Roman Perepelitsa
2019-06-22 20:49 ` Sebastian Gniazdowski
0 siblings, 1 reply; 6+ messages in thread
From: Roman Perepelitsa @ 2019-06-22 17:45 UTC (permalink / raw)
To: Sebastian Gniazdowski; +Cc: Zsh Users
This should work as long as you don't write too much stuff without
giving ZLE a chance to read it.
# After executing this, you can write stuff to file descriptor $zle_msg_fd
# and it'll be shown in the ZLE status line.
#
# echo "Hello World" >&$zle_msg_fd
# ( echo 'Hello'; sleep 1; echo 'World' ) >&$zle_msg_fd &!
() {
emulate -L zsh && setopt err_return
local fifo && fifo=$(mktemp -u "${TMPDIR:-/tmp}"/fifo.XXXXXXXXXX)
mkfifo $fifo
exec {zle_msg_fd} <> $fifo
rm $fifo
function _zle_msg_process() {
emulate -L zsh
while IFS='' read -r -u $zle_msg_fd line && zle -M $line
}
zle -F $zle_msg_fd _zle_msg_process
}
Roman.
On Sat, Jun 22, 2019 at 7:18 PM Sebastian Gniazdowski
<sgniazdowski@gmail.com> wrote:
>
> Hello,
> I've forged as I think an interesting function, which will display
> given message under the prompt regardless if ran from within zle or
> not. It uses the exec <(...) / zle -F trick to dispatch a callback
> that does have the zle active (zle -F -w isn't needed, zle -M works
> fine from no-widget callback):
>
> # deploy-message Hello world
> # deploy-message @sleep:5.5 "Hello world"
> deploy-message() {
> [[ "$1" = <-> && ${#} -eq 1 ]] && { zle && {
> local alltext text IFS=$'\n' nl=$'\n'
> repeat 25; do read -u"$1" text; alltext+="${text:+$text$nl}"; done
> [[ -n "$alltext" ]] && zle -M "$alltext"
> }
> zle -F "$1"; exec {1}<&-
> return 0
> }
> local THEFD
> # The expansion is: if there is @sleep: pfx, then use what's after
> # it, otherwise substitute 0
> exec {THEFD} < <(LANG=C sleep $(( 0.01 +
> ${${${(M)1#@sleep:}:+${1#@sleep:}}:-0} )); print -r --
> ${1:#(@msg|@sleep:*)} "${@[2,-1]}")
> zle -F "$THEFD" -deploy-message
> }
>
> There's a gist with the function as well, in case of any updates:
> https://gist.github.com/psprint/b6503c0c37de483f68d055e9c47981b3
> --
> Sebastian Gniazdowski
> News: https://twitter.com/ZdharmaI
> IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
> Blog: http://zdharma.org
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: A function to display message under the prompt without zle active
2019-06-22 17:45 ` Roman Perepelitsa
@ 2019-06-22 20:49 ` Sebastian Gniazdowski
2019-06-22 21:17 ` Roman Perepelitsa
0 siblings, 1 reply; 6+ messages in thread
From: Sebastian Gniazdowski @ 2019-06-22 20:49 UTC (permalink / raw)
To: Roman Perepelitsa; +Cc: Zsh Users
On Sat, 22 Jun 2019 at 19:45, Roman Perepelitsa
<roman.perepelitsa@gmail.com> wrote:
>
> This should work as long as you don't write too much stuff without
> giving ZLE a chance to read it.
>
> # After executing this, you can write stuff to file descriptor $zle_msg_fd
> # and it'll be shown in the ZLE status line.
The command line seems to be blcoked after first using the descriptor.
> # echo "Hello World" >&$zle_msg_fd
> # ( echo 'Hello'; sleep 1; echo 'World' ) >&$zle_msg_fd &!
> () {
> emulate -L zsh && setopt err_return
> local fifo && fifo=$(mktemp -u "${TMPDIR:-/tmp}"/fifo.XXXXXXXXXX)
> mkfifo $fifo
> exec {zle_msg_fd} <> $fifo
> rm $fifo
> function _zle_msg_process() {
> emulate -L zsh
> while IFS='' read -r -u $zle_msg_fd line && zle -M $line
> }
> zle -F $zle_msg_fd _zle_msg_process
> }
>
> Roman.
>
> On Sat, Jun 22, 2019 at 7:18 PM Sebastian Gniazdowski
> <sgniazdowski@gmail.com> wrote:
> >
> > Hello,
> > I've forged as I think an interesting function, which will display
> > given message under the prompt regardless if ran from within zle or
> > not. It uses the exec <(...) / zle -F trick to dispatch a callback
> > that does have the zle active (zle -F -w isn't needed, zle -M works
> > fine from no-widget callback):
> >
> > # deploy-message Hello world
> > # deploy-message @sleep:5.5 "Hello world"
> > deploy-message() {
> > [[ "$1" = <-> && ${#} -eq 1 ]] && { zle && {
> > local alltext text IFS=$'\n' nl=$'\n'
> > repeat 25; do read -u"$1" text; alltext+="${text:+$text$nl}"; done
> > [[ -n "$alltext" ]] && zle -M "$alltext"
> > }
> > zle -F "$1"; exec {1}<&-
> > return 0
> > }
> > local THEFD
> > # The expansion is: if there is @sleep: pfx, then use what's after
> > # it, otherwise substitute 0
> > exec {THEFD} < <(LANG=C sleep $(( 0.01 +
> > ${${${(M)1#@sleep:}:+${1#@sleep:}}:-0} )); print -r --
> > ${1:#(@msg|@sleep:*)} "${@[2,-1]}")
> > zle -F "$THEFD" -deploy-message
> > }
> >
> > There's a gist with the function as well, in case of any updates:
> > https://gist.github.com/psprint/b6503c0c37de483f68d055e9c47981b3
> > --
> > Sebastian Gniazdowski
--
Sebastian Gniazdowski
News: https://twitter.com/ZdharmaI
IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
Blog: http://zdharma.org
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: A function to display message under the prompt without zle active
2019-06-22 20:49 ` Sebastian Gniazdowski
@ 2019-06-22 21:17 ` Roman Perepelitsa
2019-06-22 21:19 ` Roman Perepelitsa
2019-06-22 21:31 ` Sebastian Gniazdowski
0 siblings, 2 replies; 6+ messages in thread
From: Roman Perepelitsa @ 2019-06-22 21:17 UTC (permalink / raw)
To: Sebastian Gniazdowski; +Cc: Zsh Users
On Sat, Jun 22, 2019 at 10:49 PM Sebastian Gniazdowski
<sgniazdowski@gmail.com> wrote:
>
> The command line seems to be blcoked after first using the descriptor.
Silly bugs. This isn't production code, I just typed it into GMail to
give an idea. Removing `while` should fix it. There is also a missing
`local` and quotes. With these fixes in place:
function _zle_msg_process() {
emulate -L zsh
local line
IFS='' read -r -u $zle_msg_fd line && zle -M $line
}
The rest of the code stays the same. The nice thing about this
implementation is that it's fork-free.
Depending on your needs you might also want to open the file descriptor
with `sysopen -rw -o cloexec`.
Note that zle will hang if you write something to the file descriptor
without a terminating \n.
Roman.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: A function to display message under the prompt without zle active
2019-06-22 21:17 ` Roman Perepelitsa
@ 2019-06-22 21:19 ` Roman Perepelitsa
2019-06-22 21:31 ` Sebastian Gniazdowski
1 sibling, 0 replies; 6+ messages in thread
From: Roman Perepelitsa @ 2019-06-22 21:19 UTC (permalink / raw)
To: Sebastian Gniazdowski; +Cc: Zsh Users
On Sat, Jun 22, 2019 at 11:17 PM Roman Perepelitsa
<roman.perepelitsa@gmail.com> wrote:
> IFS='' read -r -u $zle_msg_fd line && zle -M $line
I've lied about adding the missing quotes. $line should be "$line".
Roman.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: A function to display message under the prompt without zle active
2019-06-22 21:17 ` Roman Perepelitsa
2019-06-22 21:19 ` Roman Perepelitsa
@ 2019-06-22 21:31 ` Sebastian Gniazdowski
1 sibling, 0 replies; 6+ messages in thread
From: Sebastian Gniazdowski @ 2019-06-22 21:31 UTC (permalink / raw)
To: Roman Perepelitsa; +Cc: Zsh Users
On Sat, 22 Jun 2019 at 23:17, Roman Perepelitsa
<roman.perepelitsa@gmail.com> wrote:
>
> On Sat, Jun 22, 2019 at 10:49 PM Sebastian Gniazdowski
> <sgniazdowski@gmail.com> wrote:
> >
> > The command line seems to be blcoked after first using the descriptor.
>
> Silly bugs. This isn't production code, I just typed it into GMail to
> give an idea. Removing `while` should fix it. There is also a missing
> `local` and quotes. With these fixes in place:
>
> function _zle_msg_process() {
> emulate -L zsh
> local line
> IFS='' read -r -u $zle_msg_fd line && zle -M $line
> }
>
> The rest of the code stays the same. The nice thing about this
> implementation is that it's fork-free.
Thanks for the code, this distinct property might get handy in some situations.
> Depending on your needs you might also want to open the file descriptor
> with `sysopen -rw -o cloexec`.
>
> Note that zle will hang if you write something to the file descriptor
> without a terminating \n.
>
> Roman.
--
Sebastian Gniazdowski
News: https://twitter.com/ZdharmaI
IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
Blog: http://zdharma.org
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2019-06-22 21:32 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-06-22 17:17 A function to display message under the prompt without zle active Sebastian Gniazdowski
2019-06-22 17:45 ` Roman Perepelitsa
2019-06-22 20:49 ` Sebastian Gniazdowski
2019-06-22 21:17 ` Roman Perepelitsa
2019-06-22 21:19 ` Roman Perepelitsa
2019-06-22 21:31 ` Sebastian Gniazdowski
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