#! /bin/bash

xx= tt=:; if [ "$XINIT_TEST" != "" ]; then xx=: tt=echo; set -x; fi
$xx xrdb -override $HOME/.Xdefaults
: ${VNCSESSION=false}
export __mdw_sechost="`hostname`"

# --- Do some fiddling ---

cleanup=":"
xset b 10 2000 50
xset r rate 500 50
xset m 1 1
$xx gnome-settings-daemon&
$xx mail-notification&
$xx $VNCSESSION || $xx gkrellm&
if [ "$XINIT_TEST" = "" ] || [ "$XWIDTH" = "" ] || [ "$XHEIGHT" = "" ]; then
  eval `xscsize -bx`
fi

# --- Crank up ESD ---

if ! $xx [ -r /tmp/.esd/socket ]; then
  esd -nobeeps -as 10&
  cleanup="$cleanup; kill $!"
fi

# --- Picking appropriate programs ---

pick_program () {
  for i in "$@"; do
    if type -t >/dev/null "$i"; then echo "$i"; return; fi
  done
  echo false
}

# --- Start a nice window manager ---

: ${wm=$(pick_program enlightenment e16)}
$tt Window manager is $wm.
$xx $wm $EOPTS&

# --- Crank up a screenlock program ---

if ! $xx $VNCSESSION; then
  xscreensaver-command -exit
  xscreensaver -no-splash&
fi
$xx gnome-panel&

# --- Emacs window measurements ---
#
# Horizontal column pixel width = 492; window manager overhead = 34
# Column character width = 82; Emacs magic overhead = -2
# Vertical line pixel height = 13; misc overhead = 52

: ${emacs=$(pick_program emacs22 emacs21)}
$tt Using editor $emacs.
case "$emacs" in
  emacs21)
    e_colwd=492 e_hextra=34
    e_colchars=82 e_cextra=-2
    e_lineht=13 e_vextra=52
    ;;
  emacs22)
    e_colwd=492 e_hextra=8
    e_colchars=82 e_cextra=-6
    e_lineht=13 e_vextra=46
    ;;
esac

# --- Xterm window measurements ---
#
# Window width is 503 (fixed).
# Vertical line pixel height = 13; misc overhead = 23

: ${term=$(pick_program pterm Eterm xterm)}
$tt Using terminal $tt
case "$term" in
  pterm) t_wd=503 t_lineht=13 t_vextra=23 geom=-geometry;;
  Eterm) t_wd=504 t_lineht=13 t_vextra=23 geom=-g;;
  xterm) t_wd=507 t_lineht=13 t_vextra=27 geom=-geometry;;
esac

# --- GNOME stuff measurements ---
#
# GNOME panel width = 113

declare -i xbound="XWIDTH - 113"

# --- Choose a width for Emacs ---
#
# We'd like it to be as wide as possible, allowing for a column of xterms
# down the right hand side.  However, I'd prefer a double-width Emacs to a
# single-width Emacs and xterms.  If it's not going to work at all, a single
# Emacs column will have to do.  Also, there's a strange thing with Emacs21
# and the toolbar, so we add on some rows which are later mysteriously
# subtracted.

declare -i ecols="(xbound - t_wd - e_hextra)/e_colwd"
if (( ecols < 2 && xbound > e_colwd * 2 + e_hextra )); then
  ecols=2
elif (( ecols < 1 )); then
  ecols=1
fi

declare -i x="ecols * e_colwd + e_hextra"
noip $emacs -geometry $((ecols * e_colchars + e_cextra))x$(((XHEIGHT - e_vextra)/e_lineht))+0+0&

# --- Now place some xterms ---
#
# A few smaller xterms are in general better than one great big one.  35
# lines is a good height for most terminals.  25 lines is a minimum.  The
# strategy for doling out xterms into a column is to make as many 35-liners
# as we can, until the remaining space would be too small for a 25-liner.  If
# we can get two 25s out of that then we do (largest first); otherwise just
# make one big one.  We stop at the end of a page, once we've made three
# xterms.

declare -i n=0 pgx=0 l h y ht
declare -i hstd="35 * t_lineht + t_vextra" hmin="25 * t_lineht + t_vextra"
while true; do
  if ((x + t_wd > xbound)); then
    if ((n >= 3)); then break; fi
    x="pgx + XWIDTH" pgx="pgx + XWIDTH" xbound="xbound + XWIDTH"
  fi
  y=0 ht=XHEIGHT
  while ((ht - hstd >= hmin)); do
    $term $geom 80x35+$x+$y&
    y="y + hstd" ht="ht - hstd" n="n + 1"
  done
  if ((ht >= 2 * hmin)); then h="ht - hmin"; else h=ht; fi
  l="(h - t_vextra)/t_lineht" h="l * t_lineht + t_vextra"
  $term $geom 80x$l+$x+$y&
  y="y + h" ht="ht - h" n="n + 1"
  if ((ht >= hmin)); then
    $term $geom 80x25+$x+$y&
    n="n + 1"
  fi
  x="x + t_wd"
done

# --- Wait for the world to end ---

$xx xwait XWAIT_DIE:XWAIT_DIE_NOW
$xx eval "$cleanup"