#!/usr/bin/env bash

 #

 # Author: Makarius

 #

 # build-jars - build Isabelle/Scala

 #

 # Requires proper Isabelle settings environment.

 ## sources

 declare -a SOURCES=(

   Concurrent/counter.scala

   Concurrent/future.scala

   Concurrent/simple_thread.scala

   Concurrent/volatile.scala

   General/exn.scala

   General/timing.scala

   General/linear_set.scala

   General/markup.scala

   General/path.scala

   General/position.scala

   General/pretty.scala

   General/scan.scala

   General/sha1.scala

   General/symbol.scala

   General/xml.scala

   General/xml_data.scala

   General/yxml.scala

   Isar/keyword.scala

   Isar/outer_syntax.scala

   Isar/parse.scala

   Isar/token.scala

   PIDE/blob.scala

   PIDE/command.scala

   PIDE/document.scala

   PIDE/isar_document.scala

   PIDE/markup_tree.scala

   PIDE/text.scala

   System/cygwin.scala

   System/download.scala

   System/event_bus.scala

   System/gui_setup.scala

   System/isabelle_charset.scala

   System/isabelle_process.scala

   System/isabelle_syntax.scala

   System/isabelle_system.scala

   System/platform.scala

   System/session.scala

   System/session_manager.scala

   System/standard_system.scala

   System/swing_thread.scala

   Thy/completion.scala

   Thy/html.scala

   Thy/thy_header.scala

   Thy/thy_info.scala

   Thy/thy_load.scala

   Thy/thy_syntax.scala

   library.scala

   package.scala

 )

 ## diagnostics

 PRG="$(basename "$0")"

 function usage()

 {

   echo

   echo "Usage: isabelle $PRG [OPTIONS]"

   echo

   echo "  Options are:"

   echo "    -f           fresh build"

   echo

   exit 1

 }

 function fail()

 {

   echo "$1" >&2

   exit 2

 }

 [ -z "$ISABELLE_HOME" ] && fail "Missing Isabelle settings environment"

 [ -z "$SCALA_HOME" ] && fail "Unknown SCALA_HOME -- Scala unavailable"

 ## process command line

 # options

 FRESH=""

 while getopts "f" OPT

 do

   case "$OPT" in

     f)

       FRESH=true

       ;;

     \?)

       usage

       ;;

   esac

 done

 shift $(($OPTIND - 1))

 # args

 [ "$#" -ne 0 ] && usage

 # build

 TARGET_DIR="$ISABELLE_HOME/lib/classes"

 TARGET="$TARGET_DIR/ext/Pure.jar"

 declare -a UPDATED=()

 if [ -n "$FRESH" ]; then

   OUTDATED=true

 else

   OUTDATED=false

   if [ ! -e "$TARGET" ]; then

     OUTDATED=true

   else

     for DEP in "${SOURCES[@]}"

     do

       [ ! -e "$DEP" ] && fail "Missing file: $DEP"

       [ "$DEP" -nt "$TARGET" ] && {

         OUTDATED=true

         UPDATED["${#UPDATED[@]}"]="$DEP"

       }

     done

   fi

 fi

 if [ "$OUTDATED" = true ]

 then

   echo "### Building Isabelle/Scala layer ..."

   [ "${#UPDATED[@]}" -gt 0 ] && {

     echo "Changed files:"

     for FILE in "${UPDATED[@]}"

     do

       echo "  $FILE"

     done

   }

   rm -rf classes && mkdir classes

   "$SCALA_HOME/bin/scalac" -unchecked -deprecation -d classes -target:jvm-1.5 "${SOURCES[@]}" || \

     fail "Failed to compile sources"

   mkdir -p "$TARGET_DIR/ext" || fail "Failed to create directory $TARGET_DIR/ext"

   pushd classes >/dev/null

   CHARSET_SERVICE="META-INF/services/java.nio.charset.spi.CharsetProvider"

   mkdir -p "$(dirname "$CHARSET_SERVICE")"

   echo isabelle.Isabelle_Charset_Provider > "$CHARSET_SERVICE"

   jar cfe "$(jvmpath "$TARGET")" isabelle.GUI_Setup META-INF isabelle || \

     fail "Failed to produce $TARGET"

   cp "$SCALA_HOME/lib/scala-swing.jar" "$SCALA_HOME/lib/scala-library.jar" "$TARGET_DIR/ext"

   popd >/dev/null

   rm -rf classes

 fi