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function psub -d (_ "Read from stdin into a file and output the filename. Remove the file when the command that called psub exits.")
set -l filename
set -l funcname
if count $argv >/dev/null
switch $argv[1]
case '-h*' --h --he --hel --help
help psub
return 0
case '*'
printf (_ "%s: Unknown argument '%s'\n") psub $argv[1]
return 1
end
end
if not status --is-command-substitution
echo psub: Not inside of command substitution >&2
return
end
# Find unique file name for writing output to
while true
set filename /tmp/.psub.(echo %self).(random);
if not test -e $filename
break;
end
end
# Write output to pipe. This needs to be done in the background so
# that the command substitution exits without needing to wait for
# all the commands to exit
mkfifo $filename
cat >$filename &
# Write filename to stdout
echo $filename
# Find unique function name
while true
set funcname __fish_psub_(random);
if not functions $funcname >/dev/null ^/dev/null
break;
end
end
# Make sure we erase file when caller exits
eval function $funcname --on-job-exit caller\; rm $filename\; functions -e $funcname\; end
end
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