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function psub --description "Read from stdin into a file and output the filename. Remove the file when the command that called psub exits."
set -l dirname
set -l filename
set -l funcname
set -l suffix
set -l use_fifo 1
while count $argv >/dev/null
switch $argv[1]
case -h --help
__fish_print_help psub
return 0
case -f --file
set use_fifo 0
set -e argv[1]
case -s --suffix
if not set -q argv[2]
printf "psub: missing operand\n"
return 1
end
set suffix $argv[2]
set -e argv[1..2]
case --
set -e argv[1]
break
case "-?" "--*"
printf "psub: invalid option: '%s'\n" $argv[1]
return 1
case "-*"
# Ungroup short options: -hfs => -h -f -s
set opts "-"(string sub -s 2 -- $argv[1] | string split "")
set -e argv[1]
set argv $opts $argv
case "*"
printf "psub: extra operand: '%s'\n" $argv[1]
return 1
end
end
if not status --is-command-substitution
echo psub: Not inside of command substitution >&2
return 1
end
set -l TMPDIR $TMPDIR
if test -z "$TMPDIR[1]"
set TMPDIR /tmp
end
if test use_fifo = 1
# 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
set dirname (mktemp -d "$TMPDIR[1]"/.psub.XXXXXXXXXX); or return
set filename $dirname/psub.fifo"$suffix"
mkfifo $filename
cat >$filename &
else if test -z $suffix
set filename (mktemp "$TMPDIR[1]"/.psub.XXXXXXXXXX)
cat >$filename
else
set dirname (mktemp -d "$TMPDIR[1]"/.psub.XXXXXXXXXX)
set filename $dirname/psub"$suffix"
cat >$filename
end
# 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
function $funcname --on-job-exit caller --inherit-variable filename --inherit-variable dirname --inherit-variable funcname
command rm $filename
if count $dirname >/dev/null
command rmdir $dirname
end
functions -e $funcname
end
end
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