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# localization: tier1
# This defines a compatibility shim for the `trap` command found in other shells like bash and zsh.
function trap -d 'Perform an action when the shell receives a signal'
set -l options h/help l/list-signals p/print
argparse -n trap $options -- $argv
or return
if set -q _flag_help
__fish_print_help trap
return 0
end
set -l mode
set -l cmd
set -l sig
# Determine the mode based on either an explicit flag or the non-flag args.
if set -q _flag_print
set mode print
else if set -q _flag_list_signals
set mode list
else
switch (count $argv)
case 0
set mode print
case 1
set mode clear
case '*'
if test $argv[1] = -
set -e argv[1]
set mode clear
else
set mode set
end
end
end
switch $mode
case clear
for sig in (string upper -- $argv | string replace -r '^SIG' '')
if test -n "$sig"
functions -e __trap_handler_$sig
end
end
case set
set -l cmd $argv[1]
set -e argv[1]
for sig in (string upper -- $argv | string replace -r '^SIG' '')
if test -n "$sig"
set -l sw --on-signal $sig
if string match -qi exit -- $sig
set sw --on-event fish_exit
end
echo "function __trap_handler_$sig $sw; $cmd; end" | source
else
return 1
end
end
case print
set -l names
if set -q argv[1]
set names $argv
else
set names (functions -a | string split ',' | string match "__trap_handler_*" | string replace '__trap_handler_' '')
end
for sig in (string upper -- $names | string replace -r '^SIG' '')
if test -n "$sig"
functions __trap_handler_$sig
echo ""
else
return 1
end
end
case list
kill -l
end
end
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