#!/bin/sh
# open info-page, man-page or command help
set -o pipefail
paginate="${PAGER:-less} +Gg"
test "$1" = "-d" && browse=1 && shift
case $1 in
  (zsh|zmv) # https://unix.stackexchange.com/questions/19290/zmv-for-zsh-dry-runs-and-man-pages
    search="${@:$#}"
    # need to install zsh-doc package for info pages
    info --vi-keys $(test $search != zsh && echo --index-search=$search) zsh || LESS="$LESS +/^ *${@:$#} *\\[" man zshall;;
  (vlc) unbuffer vlc --full-help "${@:2}" | $paginate;;
  (gh|chordpro) $@ --help | $paginate;;
  (caddy) $1 help ${@:2} | $paginate;;
  (*) man "$@" || { info "$1" -w | grep -v "manpages" && pinfo "$@"; } || ( "$@" --help || "$@" -help ) 2>&1 | $paginate || which "$@";;
esac
docs="/usr/share/doc/$1"
if test -d "$docs"; then
  if test -z "$browse"
  then echo "Find more in $docs"
  else
    len() { echo $1 | wc -c; }
    shortest() {
      read shortest
      while read in
      do test $(len $shortest) -gt $(len $in) && shortest=$in
      done
      echo $shortest
    }
    firefox "file://$(find $docs -name index.html | shortest | grep . || find $docs -name $1*.html | shortest)"
  fi
fi