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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 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