blob: 6ab0b3e7fdf3e654af1a9d10d40409531cc738d3 (
plain) (
blame)
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
|
# Abstract calls to Bash help vs man(1)
self=han
# Ensure we're using at least version 3.0
# shellcheck disable=SC2128
[ -n "$BASH_VERSINFO" ] || exit # Check version array exists (>=2.0)
((BASH_VERSINFO[0] >= 3)) || exit # Check actual major version number
# Figure out the options with which we can call help; Bash >=4.0 has an -m
# option which prints the help output in a man-page like format
declare -a helpopts
if ((BASH_VERSINFO[0] >= 4)) ; then
helpopts=(-m)
fi
# Create a temporary directory with name in $td, and a trap to remove it when
# the script exits
td=
cleanup() {
[[ -n $td ]] && rm -fr -- "$td"
}
trap cleanup EXIT
td=$(mktd "$self") || exit
# If we have exactly one argument and a call to the help builtin with that
# argument succeeds, display its output with `pager -s`
if (($# == 1)) &&
help "${helpopts[@]}" "$1" >"$td"/"$1".help 2>/dev/null ; then
(cd -- "$td" && "$PAGER" -s -- "$1".help)
# Otherwise, just pass all the arguments to man(1)
else
man "$@"
fi
|