### -*-bash-*-
###
### Bash startup things

## The `.bashrc' hook will run us if it thinks we haven't been run before.
## We should therefore let it know.
export __mdw_profile=done

###--------------------------------------------------------------------------
### 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
    [ -d $i ] || continue
    case "X$val" in
      X) val=$i change=t continue ;;
      X$i) continue ;;
      X*:$i:*) val=`echo $val | sed -e "s=:$i:=:="` ;;
      X$i:*) val=${val#$i:} ;;
      X*:$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) export $var="$val" ;; esac
}

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

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

## Work out my home directory.
##
## This horrible trick resolves symbolic links.  It enables resolving links,
## changes directory and displays the name of the directory in a subshell to
## avoid changing the current state.
HOME=`(set -P; cd $HOME; pwd)`
[ -n "$SCHROOT_SESSION_ID" ] || cd $HOME

## CDE's session structure is demented and doesn't leave us with a proper
## logout hook, so synthesize one here.
[ -n "$DT" ] && trap "source $HOME/.bash_logout" EXIT

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

## The main path.
__mdw_addto PATH l \
  $HOME/bin \
  {/usr{/local,}{,/X11R6},}{/bin,/sbin,/games} \
  /opt/nfast{,/gcc}{/bin,/sbin} \
  $HOME/src/ncipher/scripts

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

## Search for `info' documents.
__mdw_addto INFOPATH r \
	$HOME/info \
	/usr/info /usr/share/info \
	/usr/local/info /usr/local/share/info \
	/usr/local/share/info/its

## Script libraries.
__mdw_addto PERLLIB r $HOME/lib/perl
__mdw_addto PYTHONPATH r $HOME/lib/python

###--------------------------------------------------------------------------
### Various other kinds of configuration.

__mdw_setconf () {
  if val=$(mdw-conf 2>/dev/null "$2"); then
    eval "export $1=\$val"
  fi
}

## Establish a temporary directory.
[ "$TMPDIR" ] || eval `tmpdir -b`
export TMP=$TMPDIR

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

## Mail and general identification.
__mdw_setconf MAIL mailbox
export NAME="Mark Wooding"
__mdw_setconf EMAIL email
export QMAILINJECT=c

## Some programs want to know the hostname.
[ -z "$HOST" ] && export HOST=`hostname`

## Text editor configuration.
export MDW_EDITOR=ed
emacs_startup_args="--no-site-file --mdw-fast-startup -nw"
for ed in \
	"emacs23 $emacs_startup_args" \
	"emacs24 $emacs_startup_args" \
	"emacs22 $emacs_startup_args" \
	"emacs21 $emacs_startup_args" \
	zile mg \
	"emacs -nw" \
	vi pico nano ae; do
  name=`echo $ed | sed 's/ .*$//'`
  if __mdw_programp "$name"; then
    MDW_EDITOR=$ed
    break
  fi
done
export EDITOR=mdw-editor VISUAL=mdw-editor

## Determine the locale settings.  Really don't set LC_COLLATE because it
## messes with the order of files in `ls' listings and similar.
if [ "$DISPLAY" != "" ]; then
  LANG=`mdw-conf x-ctype POSIX`
else
  : ${LANG=${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=.utf8
      else
	ctype=
      fi
      LANG=${LANG%.*}$ctype
      ;;
  esac
fi
unset LC_ALL
export LC_COLLATE=POSIX LANG

## Pager configuration.
export MDW_PAGER=`type -p less` PAGER=mdw-pager METAMAIL_PAGER=mdw-pager
export LESS="-iqgRh1j.3FSX"
export LESSOPEN="|lesspipe.sh %s"
case "${LC_CTYPE-$LANG}" in
  *utf8 | *utf-8 | *UTF8 | *UTF-8) LESSCHARSET=utf-8 ;;
  *) LESSCHARSET=latin1 ;;
esac
export LESSCHARSET
__mdw_programp global && export LESSGLOBALTAGS=global

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

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

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

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

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

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

## It's useful to see the little sigils in `ls'.
[ -z "$LS_OPTIONS" ] && export LS_OPTIONS="-F"

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

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

## News server.
__mdw_setconf NNTPSERVER nntp-server

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

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

## Configure `ps'.
export PS_PERSONALITY=gnu

## 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 ssh,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
  export __mdw_sechost="`hostname`"
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>/dev/null; then
    :
  else
    pixie -d 2>>$HOME/.catacomb/pixie.log
    __mdw_started_pixie=yes
  fi
fi

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

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

## If we haven't run the `.bashrc' yet, and this shell is interactive, then
## run it now.
[ -z "$__mdw_bashrc" ] && [ -t 0 ] && \
  [ -r $HOME/.bashrc ] && . $HOME/.bashrc

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