[BUG] -e exec commands not working on *stdin* scratch buffer

[gknittl]

Version of Kakoune

v2025.06.03

Reproducer

First, thank you for Kakoune, still loving it!

to reproduce launch kak from a terminal prompt with the following command line:

for i in {1..5}; do echo $i; done|kak -e "exec jge;eval rename-buffer temp"
or
for i in {1..5}; do echo $i; done|kak -e "eval rename-buffer temp;exec jge"

for i in {1..5}; do echo $i; done|kak -e "exec <percent>;eval rename-buffer temp"

Outcome

This creates a *stdin* scratch buffer with 6 lines. cursor remains at 1,1. rename-buffer does work as expected. d. % fails to select the entire buffer. Manually entering the commands works.

Expectations

Position the cursor to the end of buffer; select the entire buffer; In general execute keys

Additional information

Debian 13 clean install.

[krobelus]

for i in {1..5}; do echo $i; done|kak -e "exec jge;eval rename-buffer temp" ### Expectations Position the cursor to the end of buffer; select the entire buffer

No, because *stdin* behaves like a fifo buffer that's still being populated. There are BufReadFifo and BufCloseFifo hooks, so you might want something like this for i in {1..5}; do echo $i; done| kak -e "hook -once global BufCloseFifo \*stdin\* %{ exec jge; eval rename-buffer temp }"

[gknittl]

Thanks! The fifo issue seems plausible. However

for i in {1..5}; do echo $i; done| kak -e "hook -once global BufCloseFifo *stdin* %{ exec jge }"

does not work for me. This Rube-Goldberg construction

for i in {2..5}; do echo $i; done| kak -e "exec i1gkl!echoge;"

does work. I guess modifying the buffer forces it closed.

Okay, so as usual there is a way to achieve this in Kakoune. But something is not quite right here for example compare

for i in {1..5}; do echo $i; done| kak -e "exec /5"
and
for i in {1..5}; do echo $i; done| kak -e "exec /5<ret>"

The first one works, the second one fails.

[krobelus]

for i in {1..5}; do echo $i; done| kak -e "hook -once global BufCloseFifo \*stdin\* %{ exec jge }" does not work for me.

looks like the hook param is empty (":doc hooks" confirms that). Doesn't matter, we can set the hook in buffer scope echo | kak -e 'hook -once buffer BufCloseFifo .* %{ echo -debug BufCloseFifo }' works for me

[gknittl]

for i in {1..5}; do echo $i; done| kak -e "hook -once buffer BufCloseFifo \*stdin\* %{ exec ge }"

is still not working for me.