### -*-sh-*-
###
### Session startup things.

## The shell-specific hook will run us if it thinks we haven't been run
## before.  We should therefore let it know.
__mdw_profile=t; export __mdw_profile

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

## __mdw_addto VAR DIR PATH ...
##
## VAR is the name of a PATH-like environment variable (i.e., one which
## contains a sequence of pathnames separated by colons).  DIR is either `l'
## or `r'.  The PATHs are pathnames.  Those PATHs which correspond to
## existing directories but which aren't currently named in the variable are
## added to the left or right (depending on DIR) of VAR.  The relative order
## of PATHs added in the same invokation is the same as the order they
## appeared in PATHs: the DIR argument only affects which end of the VAR they
## get added to.
__mdw_addto () {
  local var=$1 val dir=$2 new="" change=nil
  eval val=\$$var
  shift 2
  for i in "$@"; do
    case "$new:" in *:$i:*) continue;; esac
    if ! [ -d $i ]; then continue; fi
    case "$val" in
      "") val=$i change=t; continue ;;
      $i) continue ;;
      *:$i:*) val=${val%%:$i:*}:${val#*:$i:} ;;
      $i:*) val=${val#$i:} ;;
      *:$i) val=${val%:$i} ;;
    esac
    new=$new:$i change=t
  done
  case $dir in
    l) val=${new#:}:$val ;;
    r) val=$val$new ;;
  esac
  case $change in t) eval $var=\$val ;; esac
}

## __mdw_programp NAME
##
## Does NAME exist as an executable program?
__mdw_programp () { type >/dev/null 2>&1 "$1"; }

## __mdw_setconf VAR CONF [DEFAULT]
##
## If CONF is defined in `~/.mdw.conf' then set VAR to its value; otherwise,
## set VAR to DEFAULT, if given; otherwise, do nothing at all.
__mdw_setconf () {
  local var=$1 conf=$2 val; shift 2
  if val=$(mdw-conf 2>/dev/null "$conf" "$@"); then
    eval "$var=\$val; export $var"
  fi
}

###--------------------------------------------------------------------------
### Other preliminaries.

## Work out my home directory, resolving symbolic links.
HOME=$(cd "$HOME"; pwd -P)
case ${SCHROOT_SESSION_ID+t} in t) ;; *) cd "$HOME" ;; esac

## CDE's session structure is demented and doesn't leave us with a proper
## logout hook, so synthesize one here.
case ${DT+t} in t) trap "source $HOME/.shell-logout" EXIT; esac

###--------------------------------------------------------------------------
### Set some basic paths.

## The main path.
export PATH
__mdw_addto PATH l \
  "$HOME"/bin \
  /usr/local/bin /usr/local/sbin /usr/local/games \
  /usr/bin /usr/sbin /usr/games \
  /usr/X11R6/bin /usr/local/X11R6/bin \
  /bin /sbin \
  /opt/nfast/bin /opt/nfast/sbin

## If we have Plan 9 from User Space, then add that in.
for i in /opt/plan9 /usr/local/plan9; do
  if [ -d $i ]; then
    PLAN9=$i; export PLAN9
    __mdw_addto PATH r $i/bin
    break
  fi
done

## Check for some standard path hacks.
for i in ccache; do
  __mdw_addto PATH l "$HOME"/bin/hacks/$i
done

###--------------------------------------------------------------------------
### Some other preliminaries.

## Establish a temporary directory.
case ${TMPDIR+t} in
  t) ;;
  *) if __mdw_programp tmpdir; then eval $(tmpdir -b); fi
esac
TMP=$TMPDIR; export TMP

## Sensible umask if users have their own groups.
umask 002

###--------------------------------------------------------------------------
### Text editor configuration.

MDW_EDITOR=ed
emacs_startup_args="--no-site-file --mdw-fast-startup -nw"
for ed in \
  "emacs24 $emacs_startup_args" \
  "emacs23 $emacs_startup_args" \
  "emacs22 $emacs_startup_args" \
  "emacs21 $emacs_startup_args" \
  zile mg \
  "emacs -nw" \
  vi pico nano ae
do
  name=${ed%% *}
  if __mdw_programp "$name"; then MDW_EDITOR=$ed; break; fi
done
EDITOR=mdw-editor VISUAL=mdw-editor
export EDITOR VISUAL MDW_EDITOR
unset ed emacs_startup_args

###--------------------------------------------------------------------------
### Locale configuration.

case ${LC_MDWSSHLANG+t},${DISPLAY+t} in
  t,*)
    LANG=$LC_MDWSSHLANG
    ;;
  ,t)
    __mdw_setconf LANG x-ctype POSIX
    ;;
  *)
    : LANG=${LC_CTYPE-${LC_ALL-$(mdw-conf console-ctype POSIX)}}
    case "$TERM,$(tty)" in
      linux,/dev/tty*)
	if { vt-is-UTF8 || kbd_mode | grep UTF-8; } >/dev/null 2>&1; then
	  ctype=.UTF-8
	else
	  ctype=
	fi
	LANG=${LANG%.*}$ctype
	;;
    esac
    ;;
esac
unset LC_ALL
export LANG

LC_COLLATE=POSIX; export LC_COLLATE

case ${LANG+t} in
  t) LC_MDWSSHLANG=$LANG; export LC_MDWSSHLANG ;;
esac

###--------------------------------------------------------------------------
### Pagers.

## Choose a sensible pager.
MDW_PAGER=more
for pg in less more; do
  if __mdw_programp "$pg"; then MDW_PAGER=$(command -v "$pg"); break; fi
done
PAGER=mdw-pager METAMAIL_PAGER=mdw-pager
export MDW_PAGER PAGER METAMAIL_PAGER
unset pg

## Configure `less'.
case ${LC_CTYPE-$LANG} in
  *utf8 | *utf-8 | *UTF8 | *UTF-8) LESSCHARSET=utf-8 ;;
  *) LESSCHARSET=latin1 ;;
esac
export LESSCHARSET
if __mdw_programp global; then
  LESSGLOBALTAGS=global
  export LESSGLOBALTAGS
fi

###--------------------------------------------------------------------------
### Miscellaneous things.

## Mail and general identification.
__mdw_setconf MAIL mailbox /var/mail/mdw
__mdw_setconf EMAIL email mdw@distorted.org.uk
NAME="Mark Wooding"; export NAME

## News server.
__mdw_setconf NNTPSERVER nntp-server

## Some programs want to know the hostname.
case ${HOST+t} in t) ;; *) HOST=$(hostname); export HOST; esac

## HTTP and FTP proxies.
http=$(mdw-conf http-proxy none)
case "${http_proxy-none},$http" in
  *,none) ;;
  none,*) http_proxy=http://$http/; export http_proxy ;;
esac
https=$(mdw-conf https-proxy none)
case "${https_proxy-none},$https,${http_proxy-none}" in
  *,none,none) ;;
  none,none,*) https_proxy=$http_proxy; export https_proxy ;;
  none,*,*) https_proxy=http://$https/; export ftp_proxy ;;
esac
ftp=$(mdw-conf ftp-proxy none)
case "${ftp_proxy-none},$ftp,${http_proxy-none}" in
  *,none,none) ;;
  none,none,*) ftp_proxy=$http_proxy; export ftp_proxy ;;
  none,*,*) ftp_proxy=http://$ftp/; export ftp_proxy ;;
esac
unset http https ftp

## Ncurses programs should use the Unicode box-drawing characters because the
## alternative character set stuff isn't supported well.
NCURSES_NO_UTF8_ACS=1; export NCURSES_NO_UTF8_ACS

## Shut up Perl's readline machinery.
PERL_READLINE_NOWARN=yes; export PERL_READLINE_NOWARN

## If we have `distcc' then tell `ccache' to use it.
if __mdw_programp distcc; then CCACHE_PREFIX=distcc; export CCACHE_PREFIX; fi

## Choose a sensible web browser.  If we have a display, try to pick a
## graphical one.
set -- elinks w3m lynx
case ${DISPLAY+t} in
  t) set -- mdw-iceweasel mdw-chrome iceweasel firefox "$@" ;;
esac
for b in "$@"; do
  if __mdw_programp $b; then BROWSER=$b; export BROWSER; break; fi
done
unset b

## Acquiring root privileges.  This is mainly the job of `bashrc', but we
## cache the mechanism here.
__mdw_setconf __MDW_ROOTLY rootly
BECOME="--preserve-environment"; export BECOME

## It's useful to see the little sigils in `ls'.
case ${LS_OPTIONS+t} in t) ;; *) LS_OPTIONS="-F"; export LS_OPTIONS; esac

## Settings for BBC BASIC listing.
export BASCAT="-l +n"

## Version control hacking.
CVS_RSH=ssh; export CVS_RSH
__mdw_setconf CVSROOT cvs-root
__mdw_setconf SVNROOT svn-root
P4CONFIG=.p4; export P4CONFIG

## Help X programs find their resources.
XUSERFILESEARCHPATH="$HOME/.Xapps/%N:/usr/lib/X11/%T/%N%S"
export XUSERFILESEARCHPATH

## Make OpenOffice.org do its thing properly.
OOO_FORCE_DESKTOP=gnome; export OOO_FORCE_DESKTOP

## Hack Qt-ish things to be unstoatly.
QT_STYLE_OVERRIDE=gtk2; export QT_STYLE_OVERRIDE

## Use X11 input method (including compose key sequences) everywhere.
GTK_IM_MODULE=xim; export GTK_IM_MODULE
QT_IM_MODULE=xim; export QT_IM_MODULE

## Configure `ps'.
PS_PERSONALITY=gnu; export PS_PERSONALITY

## Disable core dumps.
ulimit -S -c 0

###--------------------------------------------------------------------------
### Authentication and SSH hacking.

## Start an authentication agent.  This is unnecessarily fiddly.  If there's
## a Gnome keyring server then we should use that; unfortunately, it may not
## yet have had a chance to populate the environment with its settings, so we
## go off and fetch them.
if { { [ "$GNOME_KEYRING_CONTROL" ] &&
       [ -s "$GNOME_KEYRING_CONTROL" ]; } ||
     { [ "$DBUS_SESSION_BUS_ADDRESS" ] &&
       __mdw_programp gnome-keyring-daemon; }; } &&
   stuff=$(gnome-keyring-daemon -s -c gpg 2>/dev/null)
then
  eval "$stuff"
  export SSH_AUTH_SOCK GPG_AGENT_INFO
fi

## If we still don't have an agent then start one with a stable name.
eval $(start-ssh-agent -b)

## Decide whether this session should be considered `secure'.  A session is
## secure if it's on a secure TTY, but there are lots of ways of finding out
## which TTYs are secure.
if [ -z "$__mdw_bashrc" ] && [ "$__mdw_force_secure_session" = "yes" ] ||
   ( tty="`tty`" devtty="(/dev/)?${tty#/dev/}"
     { { { [ -e /etc/securetty ] && sectty=/etc/securetty; } ||
	 { [ -e /etc/securettys ] && sectty=/etc/securettys; }; } &&
       egrep "$devtty" $sectty >/dev/null; } ||
     { [ -e /etc/default/login ] &&
       egrep "^CONSOLE=$devtty" /etc/default/login >/dev/null; } ||
     case "${tty#/dev/}" in
       console|systty|tty[0-9]) true ;;
       *) false ;;
     esac )
then
  __mdw_sechost=$HOST; export __mdw_sechost
fi

## Start a passphrase pixie if there is one and it's not already running.
if pixie --version >/dev/null 2>&1; then
  mkdir -p "$HOME/.catacomb"
  pixie=${CATACOMB_PIXIE-$HOME/.catacomb/pixie}
  if [ -S "$pixie" ] && pixie -C help >/dev/null 2>&1; then
    :
  else
    pixie -d 2>>"$HOME/.catacomb/pixie.log"
    __mdw_started_pixie=yes
  fi
fi

###--------------------------------------------------------------------------
### Finishing touches.

## For old-fashioned Bourne-ish shells, set up per-shell definitions.
ENV=$HOME/.shrc; export ENV

## If there's a local hook then run it.
if [ -f "$HOME/.profile-local" ]; then . "$HOME/.profile-local"; fi

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