SOLUTION (with code), WAS: Re: When will be created a great desktop experience for OpenBSD?

[chohag]

Here is a script you can all use which selects a desktop environment,
installs it if necessary, and configures a (eg. your) user's X session
so that it starts when he, she or you log in, facilitating further
user-centric configuration.

Perhaps if you ask really nicely the devs will install it into the base
system somewhere for you and maintain the map of packages to
descriptions because even the densest among you must be aware by now
that you're never getting anything more complicated than this.

Now will you all please stop this and go and do something useful?

Matthew

src/gui-selector.sh:

#!/bin/ksh

default="fvwm"
builtin="cwm fvwm twm"
bloaty="kde gnome xfce"
gnome="gnome" # Is there something for this?
gnome_full=$gnome
gnome_bloat="gnome-extras"
gnome_bin=/usr/local/bin/gnome
kde="kde4-minimal"
kde_full="kde4"
kde_bloat="kde4-extras"
kde_bin=/usr/local/bin/kde4
xfce="xfce"
xfce_full="xfce-extras"
xfce_bloat=$xfce_full
xfce_bin=/usr/local/bin/xfce

cwm_desc="?"
fvwm_desc="Simple, effective, default"
twm_desc="Theo likes it so it must be good"
gnome_desc="We know what you want, except not correctly like Apple"
kde_desc="The only DE ever to kill my X server"
xfce_desc="I heard of this once"

error() {
  if [[ $# != 0 ]]; then
    echo "$@" >&2
  else
    cat >&2
  fi
}

abort() {
  error "$@"
  exit 1
}

msg() {
  if [[ $# != 0 ]]; then
    echo "$@"
  else
    cat
  fi
}

prompt() {
  answer= # NOT local
  echo -n "$@" ''
  read answer
  echo
}

root=
if [[ `id -u` -ne 0 ]]; then
  root=doas
  error <<ROOT
Before this script can continue root access required.

Either stop this script with Ctrl-C and execute it in a root shell or
ensure this line exists in /etc/doas.conf:

  permit nopass $USER as root cmd pkg_add

Note that there are more secure ways to achieve this but it should be
acceptable for a desktop computer; see doas.conf(5) for more
information.

When your user account's root privileges are enabled, press enter to
continue.

ROOT

  prompt Root privileges?
fi

# TODO: layouts and shit
list_ui() {
  unset list # NOT local
  local this=0
  for cat in builtin bloaty; do
    msg DE category: $cat
    msg ''
    eval _all=\$$cat
    for de in $_all; do
      eval msg $this: $de -- \$${de}_desc
      list[$this]=$de
      ((this++))
    done
    msg ''
  done
}

find_de() {
  de= # NOT local
  local _c=$1 _i=
  if [[ " $builtin $bloaty " = *" $_C "* ]]; then
    de=$_c
    return 0
  fi
  if [[ $_c = *[0-9]* && $_c -lt ${#list[@]} ]]; then
    de=${list[$_c]}
    return 0
  fi
  _i=0
  while [[ $_i -lt ${#list[@]} ]]; do
    if [[ ${list[$_i]} = $_c ]]; then
      de=$_c
      return 0
    fi
    ((_i++))
  done
  return 1
}

list_ui

msg You may identify a desktop environment by its number or its short name.

while prompt Which desktop environment would you like to use? && ! find_de 
"$answer"; do
  error Invalid selection.
done

if ! [[ " $builtin " = *" $de "* ]]; then
  msg <<BLOAT
Desktop environments other than those which are built into the base
system come in up to three flavours, Regular, Full and Bloaty. Not all
environments provide all three flavours. If you select a flavour which
is not available the next-smallest flavour will be chosen in its place.

BLOAT
  while prompt Which flavour would you like to install [Regular]: && [[ -n 
"$answer" && "$answer" != [BbFfRr]* ]]; do
    error Invalid selection.
  done

  case "$answer" in
  [Bb]*)    bloat=${de}_bloat;;
  [Ff]*)    bloat=${de}_full;;
  [Rr]*|'') bloat=$de;;
  esac

  eval \$root pkg_add \$$bloat
fi

if [[ `id -u` -eq 0 ]]; then
  _g=
  while prompt Which user account to you want to set the desktop environment 
for? && ! _g=$(getent passwd "$answer"); do
    error Invalid user.
  done
  userhome=$(echo "$_g" | cut -d: -f6)
  whose="the user's"
else
  userhome=$HOME
  whose="your"
fi

if [[ -e $userhome/.xsession ]]; then
  bak=$(date +%F:%T)
  msg Backing up previous xsession file to "$userhome/.xsession~$bak"
  cp "$userhome/.xsession" "$userhome/.xsession~$bak" || abort cp .xsession
fi

if [[ " $builtin " = *" $de "* ]]; then
  echo exec /usr/X11R6/bin/$de > $userhome/.xsession
else
  eval echo exec \$${de}_bin > $userhome/.xsession
fi || abort Could not write to $userhome/.xsession

msg << COMPLETE
$de has been installed and configured as $whose default desktop
environment. You may log out or reboot to enter it.

To install another environment and change $whose default, simply
run this script again.

COMPLETE