lib/Tools/install

clarified code

#!/usr/bin/env bash
#
# $Id$
# Author: Markus Wenzel, TU Muenchen
#
# DESCRIPTION: install standalone Isabelle executables


PRG=$(basename "$0")

function usage()
{
  echo
  echo "Usage: $PRG [OPTIONS]"
  echo
  echo "  Options are:"
  echo "    -d DISTDIR   refer to DISTDIR as Isabelle distribution"
  echo "                 (default ISABELLE_HOME)"
  echo "    -p DIR       install standalone binaries in DIR"
  echo
  echo "  Install Isabelle executables with absolute references to the current"
  echo "  distribution directory."
  echo
  exit 1
}

function fail()
{
  echo "$1" >&2
  exit 2
}


## process command line

# options

NO_OPTS=true

DISTDIR="$ISABELLE_HOME"
BINDIR=""

while getopts "d:p:" OPT
do
  NO_OPTS=""
  case "$OPT" in
    d)
      DISTDIR="$OPTARG"
      ;;
    p)
      BINDIR="$OPTARG"
      ;;
    \?)
      usage
      ;;
  esac
done

shift $(($OPTIND - 1))


# args

[ "$#" -ne 0 -o -n "$NO_OPTS" ] && usage


## main

echo "referring to distribution at $DISTDIR"


# standalone binaries

#set by configure
AUTO_BASH=bash

case "$AUTO_BASH" in
  /*)
    BASH="$AUTO_BASH"
    ;;
  *)
    BASH="/usr/bin/env bash"
    ;;
esac

if [ -n "$BINDIR" ]; then
  mkdir -p "$BINDIR" || fail "Bad directory: $BINDIR"

  for NAME in isatool isabelle-process isabelle-interface
  do
    BIN="$BINDIR/$NAME"
    DIST="$DISTDIR/bin/$NAME"
    echo "installing $BIN"
    rm -f "$BIN"
    echo "#!$BASH" > "$BIN" || fail "Cannot write file: $BIN"
    echo >> "$BIN"
    echo "exec \"$DIST\" \"\$@\"" >> "$BIN"
    chmod +x "$BIN"
  done
  for NAME in Isabelle isabelle
  do
    BIN="$BINDIR/$NAME"
    echo "installing $BIN"
    rm -f "$BIN"
    cp "$ISABELLE_HOME/bin/$NAME" "$BIN" || fail "Cannot write file: $BIN"
    chmod +x "$BIN"
  done
fi