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#!/usr/bin/env bash
# Abstract calls to Bash help vs man(1)
self=han
# Give up completely if no BASH_VERSINFO (<2.0)
[ -n "$BASH_VERSINFO" ] || exit
# Figure out the options with which we can call help; Bash >=4.0 has an -m
# option which prints the help output in a man-page like format.
declare -a helpopts
if ((BASH_VERSINFO[0] >= 4)) ; then
helpopts=(-m)
fi
# Create a temporary file and set up a trap to get rid of it.
tmpdir=$(mktemp -dt "$self".XXXXXX) || exit
cleanup() {
rm -fr -- "$tmpdir"
}
trap cleanup 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[@]}" "$1" >"$tmpdir"/"$1".help 2>/dev/null ; then
(cd -- "$tmpdir" && pager -s -- "$1".help)
# Otherwise, just pass all the arguments to man(1).
else
man "$@"
fi
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