.ns

# -*- mode: sh -*-
#
# .ns - Nice Shell
# ^^^^^^^^^^^^^^^^ don't touch this line
# (short name for quick invocation from other shells)
#
# Source this to get a decent setup from another account.
#
# $Id$
#

if [ -n "$DEBUG_NS" ]; then
  set -x
fi

detect_current_shell () {
  current_shell=

  if [ -n "$ZSH_VERSION" ]; then
    current_shell=zsh
    if [ -n "$BASH_VERSION" ]; then
      echo "BUG!  Both {BASH,ZSH}_VERSION set" >&2
      return 1
    fi
  elif [ -n "$BASH_VERSION" ]; then
    current_shell=bash
  else
    case "$SHELL" in
        *bash) current_shell=bash ;;
         *zsh) current_shell=zsh  ;;
    esac
  fi
}

find_me () {
  if [ -n "$1" ] && grep -q '# .ns - Nice Shell' "$1"; then
      me="$1"
      return 0
  fi

  if [ -n "${BASH_SOURCE[0]}" ]; then
    me="${BASH_SOURCE[0]}"
  else
    me="$0"
  fi
  case "$here" in
    -*)
      echo "Couldn't figure out where to look for .zshrc; please specify ZDOTDIR.  Aborting." >&2
      return 1
      ;;
  esac
  return 0
}

find_zdotdir () {
  here="`dirname $me`"
  if ! [ -e $here/.zshrc ]; then
    echo "$here missing .zshrc, aborting." >&2
    return 1
  fi

  # Not sure why I bothered with this.
#  here="`$here/bin/shortcuts/abs $0`"
#  here="`dirname $here`"

  if ! [ -e $here/.zshrc ]; then
    echo "abs failed"
    return 1
  fi

  ZDOTDIR="$here"
  return 0
}

detect_current_shell

# We have to intelligently guess where this file is.
# When this file is sourced:
#   in sh/bash/ksh, $0 becomes the interpreter name (i.e. 'bash' etc.)
#   in zsh,         $0 becomes the argument to source (i.e. this file)
case "$current_shell" in
    bash)
        find_me || return $?
        ;;
    zsh)
        find_me "$0" || return $?
        ;;
    *)
        echo "FIXME: current_shell=$current_shell not yet supported" >&2
        return 1
        ;;
esac

if [ -z "$ZDOTDIR" ]; then
    find_zdotdir || return $?
fi
if [ -z "$ZDOTDIR" ]; then
    echo "BUG: find_zdotdir failed?!" >&2
    return 1
fi
export ZDOTDIR # but see caveat at EOF

[ -z "$shared_env_loaded" ] && source "$ZDOTDIR/.shared_env"

# Don't do anything with non-interactive shells.
[ -z "$shell_interactive" ] && return 1

if [ -n "$DEBUG_NS" ]; then
  set +x
fi

case "$current_shell" in
  bash)
    source "$ZDOTDIR/.bashenv"
    source "$ZDOTDIR/.bashrc"
    # Are you feeling lucky, punk?
    SHLVL=force_danger source "$ZDOTDIR/.switch_shell" "$@"
    ;;
  zsh)
    source "$ZDOTDIR/.zshenv"
    source "$ZDOTDIR/.zshrc"
    ;;
  *)
    source "$ZDOTDIR/.switch_shell" "$@"
    ;;
esac

# N.B. If this file was source'd via:
#   ZDOTDIR=/home/aspiers source /home/aspiers/.ns
# or similar, as soon as the "source-ing" finishes,
# for some reason ZDOTDIR vanishes.  So better to
# do an explicit export of ZDOTDIR at invocation time.
# Dunno if this is a bug or feature.