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add run_on_load functionality
[etc/zsh.git] / .zsh / util
1 # util
2 #
3 # Miscellaneous utility functions
4 #
5 # Copyright © 1994–2017 martin f. krafft <madduck@madduck.net>
6 # Released under the terms of the Artistic Licence 2.0
7 #
8 # Source repository: http://git.madduck.net/v/etc/zsh.git
9 #
10
11 is_root() {
12   test ${EUID:?} -eq 0
13 }
14
15 array_prepend() {
16   local arrayname="$1"; shift
17   local i
18   for i; do
19     eval "typeset -ga $arrayname; $arrayname=(\$i \${$arrayname[@]/\$i})"
20   done
21 }
22
23 array_append() {
24   local arrayname="$1"; shift
25   local i
26   for i; do
27     eval "typeset -ga $arrayname; $arrayname=(\${$arrayname[@]/\$i} \$i)"
28   done
29 }
30
31 function trace() { ( eval "set -x; $@"; ) }
32
33 function run_at_most_every() {
34   local timespec=
35   case "$1" in
36     ((#b)([0-9]##)([smhd])) timespec="${match[2]}-${match[1]}";;
37     (*)
38       zerror "missing timespec: $@"
39       return
40   esac
41   shift
42
43   local sentinel_dir="${XDG_RUNTIME_DIR:-${TMPDIR:-/tmp}}/run_at_most_once_per"
44   mkdir --parent "${sentinel_dir}"
45   local sentinel="${sentinel_dir}/${*//[^[:alnum:]]##/_}_${timespec}"
46   if test -z ${sentinel}(#qNm${timespec}); then
47     touch "${sentinel}"
48     $@
49     return $?
50   fi
51 }
52
53 # vim:ft=zsh