/usr/share/fish/functions/trap.fish is in fish-common 2.2.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | function __trap_translate_signal
set upper (echo $argv[1]|tr a-z A-Z)
if expr $upper : 'SIG.*' >/dev/null
echo $upper | cut -c 4-
else
echo $upper
end
end
function __trap_switch
switch $argv[1]
case EXIT
echo --on-exit %self
case '*'
echo --on-signal $argv[1]
end
end
function trap -d 'Perform an action when the shell receives a signal'
set -l mode
set -l cmd
set -l sig
set -l options
set -l longopt
set -l shortopt lph
if not getopt -T > /dev/null
# GNU getopt
set longopt print,help,list-signals
set options -o $shortopt -l $longopt --
# Verify options
if not getopt -n type $options $argv >/dev/null
return 1
end
else
# Old getopt, used on OS X
set options $shortopt
# Verify options
if not getopt $options $argv >/dev/null
return 1
end
end
# Do the real getopt invocation
set -l tmp (getopt $options $argv)
# Break tmp up into an array
set -l opt
eval set opt $tmp
while count $opt >/dev/null
switch $opt[1]
case -h --help
__fish_print_help trap
return 0
case -p --print
set mode print
case -l --list-signals
set mode list
case --
set -e opt[1]
break
end
set -e opt[1]
end
if not count $mode >/dev/null
switch (count $opt)
case 0
set mode print
case 1
set mode clear
case '*'
if test opt[1] = -
set -e opt[1]
set mode clear
else
set mode set
end
end
end
switch $mode
case clear
for i in $opt
set sig (__trap_translate_signal $i)
if test $sig
functions -e __trap_handler_$sig
end
end
case set
set -l cmd $opt[1]
set -e opt[1]
for i in $opt
set -l sig (__trap_translate_signal $i)
set sw (__trap_switch $sig)
if test $sig
eval "function __trap_handler_$sig $sw; $cmd; end"
else
return 1
end
end
case print
set -l names
if count $opt >/dev/null
set names $opt
else
set names (functions -na|sgrep "^__trap_handler_"|sed -e 's/__trap_handler_//' )
end
for i in $names
set sig (__trap_translate_signal $i)
if test sig
functions __trap_handler_$i
else
return 1
end
end
case list
kill -l
end
end
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