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#! /bin/bash
###
### X startup script

###--------------------------------------------------------------------------
### Utility functions.

## Progress indicators.
info=yes
info () {
  case $info in yes) echo "- $*" >&2 ;; esac
}

run=yes
run () {
  local what=$1; shift
  local bg=no

  case $what in bg*) bg=yes what=${what#bg} ;; esac
  info "run $what: $*"

  case "$run,$bg" in
    yes,no) "$@" ;;
    yes,yes) "$@" & ;;
  esac
}

## Program choice
pick_program () {
  local what=$1; shift
  local choice=false
  for i in "$@"; do
    if type -t >/dev/null "$i"; then choice=$i; break; fi
  done
  info "pick $what = $choice"
  echo "$choice"
}

###--------------------------------------------------------------------------
### Parse arguments.

vnc=no
atomtag=
start=yes
wait=yes

for opt; do
  case "$opt" in
    help)
      cat <<EOF
Options:
  tag=TAG
  [no]trace
  [no]info
  [no]run
  [no]start
  [no]wait
  [no]vnc
EOF
      exit
      ;;

    tag=*) atomtag=/${opt#tag=} ;;
    trace) set -x ;;
    notrace) set +x ;;
    info | run | start | wait | vnc) eval "$opt=yes" ;;
    noinfo | norun | nostart | nowait | novnc) eval "${opt#no}=no" ;;

    *) echo "unknown option $opt" >&2; exit 1 ;;
  esac
done

###--------------------------------------------------------------------------
### Iniitial settings.

## Assume X sessions are secure.
export __mdw_sechost="`hostname`"

## Obtain the screen dimensions.
case ",$XWIDTH,$XHEIGHT," in
  *,,*) eval $(xscsize -bx) ;;
esac
info "screen size = $XWIDTH x $XHEIGHT"

initialize () {
  ## Load the X resource database.
  run init xrdb -override $HOME/.Xdefaults

  ## Random xsettery.
  run init xset b 10 2000 50
  run init xset r rate 500 50
  run init xset m 2 1

  ## Key mappings.
  xmodmap -e 'keysym BackSpace = BackSpace BackSpace'

  ## Gnome settings.
  case $vnc in no) run bginit gnome-settings-daemon ;; esac
}

###--------------------------------------------------------------------------
### Start a window manager.

wm=$(pick_program window-manager enlightenment e16 twm)
wmopts=""
case "$wm,$vnc" in
  enlightenment,yes | e16,yes)
    wmopts="$eopts -econfdir $HOME/.enlightenment-vnc"
    ;;
esac

start-window-manager () {
  run bginit $wm $wmopts
}

###--------------------------------------------------------------------------
### Random useful clients.

start-clients-local () { :; }

start-clients () {
  ## Mail notification.
  run bginit mail-notification

  ## System monitor.
  case $vnc in no) run bginit gkrellm ;; esac

  ## Screensaver.
  case $vnc in
    no)
      run init xscreensaver-command -exit
      run bginit xscreensaver -no-splash
      ;;
  esac

  ## Panel.
  case $vnc in no) run bginit gnome-panel ;; esac

  ## System tray.
  run bginit stalonetray

  ## Local clients.
  start-clients-local
}

###--------------------------------------------------------------------------
### Main screen layout.

## Choose appropriate clients.
emacs=$(pick_program emacs emacs23 emacs22 emacs21 emacs)
term=$(pick_program terminal pterm Eterm xterm)

## Emacs window measurements.
case "$emacs" in
  emacs21 | emacs)
    e_colwd=492 e_hextra=34
    e_colchars=82 e_cextra=-2
    e_lineht=13 e_vextra=52
    ;;
  emacs22 | emacs23)
    e_colwd=492 e_hextra=8
    e_colchars=82 e_cextra=-6
    e_lineht=13 e_vextra=46
    ;;
esac

## Terminal window measurements.
case "$term" in
  pterm) t_wd=504 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.
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 \
  emacsx="ecols * e_colchars + e_cextra" \
  emacsy="(XHEIGHT - e_vextra)/e_lineht"

start-emacs () {
  run bgclients noip $emacs -geometry ${emacsx}x${emacsy}+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.

start-xterms () {

  ## Initialize some parameters.
  declare -i x="ecols * e_colwd + e_hextra" xb=xbound
  declare -i n=0 pgx=0 l h y ht
  declare -i hstd="35 * t_lineht + t_vextra" hmin="25 * t_lineht + t_vextra"

  ## Do the placement.
  while :; do

    ## Start a new iteration.
    if ((x + t_wd > xb)); then
      if ((n >= 3)); then break; fi
      x="pgx + XWIDTH" pgx="pgx + XWIDTH" xb="xb + XWIDTH"
    fi

    ## Make large xterms.
    y=0 ht=XHEIGHT
    while ((ht - hstd >= hmin)); do
      run bgclients $term $geom 80x35+$x+$y
      y="y + hstd" ht="ht - hstd" n="n + 1"
    done

    ## Fill the remaining space.
    if ((ht >= 2 * hmin)); then h="ht - hmin"; else h=ht; fi
    l="(h - t_vextra)/t_lineht" h="l * t_lineht + t_vextra"
    run bgclients $term $geom 80x$l+$x+$y
    y="y + h" ht="ht - h" n="n + 1"
    if ((ht >= hmin)); then
      run bgclients $term $geom 80x25+$x+$y
      n="n + 1"
    fi
    x="x + t_wd"
  done
}

###--------------------------------------------------------------------------
### Requesters.

req () {
  declare title=$1 hist=$2; shift 2
  cmd=$(xgetline -t "$title" -p "Command:" -Hl "$HOME/$hist") &&
  exec "$@" "$cmd"
}

###--------------------------------------------------------------------------
### Final waiting.

atom=XINIT_COMMAND$atomtag

xwait () {
  while :; do
    xatom delete $atom
    info "waiting on $atom"
    line=$(xatom wait $atom)
    info "xatom: $line"

    case "$line" in
      :help)
	xmsg -I -t "xinitrc help" -d "xinitrc commands" - <<EOF &
:help
:emacs :xterms :window-manager :clients
:ask-run :ask-command
:init
:terminal
! SHELL-COMMAND
CLIENT
EOF
	;;
      :emacs | :xterms | :window-manager | :clients)
	start-${line#:}
	;;
      :terminal)
	run bgclients $term
	;;
      :init)
	initialize
	;;
      :exec)
	info "restarting xinitrc"
	exec "$0" wait nostart
	;;
      :ask-run)
	req "Shell command" .cmd.hist xcatch -FMiscFixed6x13 -- sh -c&
	;;
      :ask-command)
	req "xinit command" .xinit.hist xatom set XINIT_COMMAND$atomtag&
	;;
      :*)
	xmsg -E -t "xinitrc error" "Unknown command \`$line'" &
	;;
      !*)
	eval "${line#!}"
	;;
      *)
        set -- $line
	run bgclients "$@"
	;;
    esac
  done
}

###--------------------------------------------------------------------------
### Actually start things up.

if [ -f $HOME/.xinitrc-local ]; then
  . $HOME/.xinitrc-local
fi

case "$start" in
  yes)
    info "starting standard clients"
    initialize
    start-window-manager
    start-clients
    start-emacs
    start-xterms
    ;;
  no)
    info "not starting standard clients"
    ;;
esac

case "$wait" in
  yes)
    xwait
    ;;
  no)
    info "not waiting before exit"
    ;;
esac

###----- That's all, folks --------------------------------------------------