#!/bin/bash

help () {
    {
    echo "usage: iocsh [options] [files]"
    echo "Start an EPICS iocsh and load files"
    echo "Recognized filetypes: *.db *.dbt *.template *.subs *.subst *.dbd *.so"
    echo
    echo "Possible options:"
    echo " -3.xx.yy: Set EPICS base version."
    echo " -32: Force 32 bit version (on 64 bit systems)."
    echo " -? or -h or --help: Show this page and exit."
    echo " -v or --version: Show version and exit."
    echo " -c: The next string is executed as a command by the EPICS shell."
    echo " -s: The next string is a sequencer program (and arguments), run with 'seq'."
    echo "     This forces an 'iocInit' before running the program."
    echo " -r: The next string is a module (and version), loaded via 'require'."
    echo " -n: The next string is the IOC name (used for prompt)."
    echo "     Default: dirname if parent dir is \"ioc\" otherwise hostname."
    echo
    echo "Supported filetypes:"
    echo "*.db, *.dbt and *.template are loaded via 'dbLoadRecords'."
    echo "  After the filename, you can specify substitutions like MACRO=value."
    echo "*.subs and *.subst are loaded via 'dbLoadTemplate'."
    echo "*.dbd is loaded via 'dbLoadDatabase'."
    echo "*.so is loaded via 'ld' or 'dlload' (3.14.12 or higer)."
    echo "If an argument is @file, more arguments are read from that file."
    echo "All other files are executed as startup scripts by the EPICS shell."
    } >&2
    exit
}

version () {
    {
    echo "iocsh by Dirk Zimoch"
    } >&2
    exit
}

case $1 in
    ( -h | "-?" | -help | --help )
        help
        ;;
    ( -v | -ver | --ver | -version | --version )
        version
        ;;
    ( -3.* )
        unset EPICS_BASE
        BASE=${1#-}
        shift
    ;;
esac

# realpath and readlink are not available on all systems, let's try what works...
rp() {
  ( realpath $1 || readlink -f $1 || readlink $1 || (cd -P $1 && echo $PWD) || (x=$(\ls -ld $1) && echo ${x##* }) || echo $1 ) 2>/dev/null
}    

# if EPICS_HOST_ARCH is not set guess it
if [ -z "$EPICS_HOST_ARCH" ]
then
    echo "EPICS_HOST_ARCH is not set"
    EPICS_HOST_ARCH=$(basename $(dirname $(rp $(which caRepeater))))
    if [ -n "$EPICS_HOST_ARCH" ]
    then
        echo "Guessing EPICS_HOST_ARCH=$EPICS_HOST_ARCH"
    else
        exit 1
    fi
fi

# check if user requested 32 bit version on a 64 bit system
case $1 in
    ( -32 )
        EPICS_HOST_ARCH=${EPICS_HOST_ARCH%_64}
        shift
    ;;
esac

# Either EPICS or EPICS_BASE should be set to the install directory
if [ -z "$EPICS_BASE" ]
then
    if [ -z "$EPICS" ]
    then
        # look for some standard install directories
        for EPICS in /usr/local/epics /opt/epics /epics
        do
            if [ -d $EPICS ]
            then
                break 2
            fi
            echo "Cannot find any EPICS installation directory." >&2
            echo "Try setting EPICS_BASE environment variable to full path" >&2
            exit 1
        done
    fi
    # find highest (requested) EPICS version that supports our architecture (or its 32 bit version)
    EPICS_BASE=$(\ls -1vrd $EPICS/base*$BASE*/bin/{${EPICS_HOST_ARCH},${EPICS_HOST_ARCH%_64}} 2>/dev/null | head -n1)
    if [ -z $EPICS_BASE ]
    then
        echo Cannot find any $BASE EPICS version for $EPICS_HOST_ARCH. >&2
        exit 1
    fi
    # maybe we need to change from 64 bit to 32 bit
    if [ $EPICS_HOST_ARCH != ${EPICS_BASE#*/bin/} ]
    then
        EPICS_HOST_ARCH=${EPICS_BASE#*/bin/}
        echo "No 64 bit version in ${EPICS_BASE%bin*}. Switch to 32 bit version $EPICS_HOST_ARCH"
    fi
    EPICS_BASE=$(rp ${EPICS_BASE%bin*})
fi
if [ ! -d $EPICS_BASE ]
then
    echo "Cannot find EPICS_BASE directory." >&2
    echo "Try setting EPICS_BASE environment variable to full path" >&2
    exit 1
fi

# Check revision
if [ -r $EPICS_BASE/configure/CONFIG_BASE_VERSION ]
then
BASE=$(awk -F '[ \t]*=[ \t]*' '
    /^[ \t]*EPICS_VERSION[ \t]*=/ {v=$2}
    /^[ \t]*EPICS_REVISION[ \t]*=/ {r=$2}
    /^[ \t]*EPICS_MODIFICATION[ \t]*=/ {m=$2}
    END {print v"."r"."m}' < $EPICS_BASE/configure/CONFIG_BASE_VERSION)
else
BASE=$(basename $(rp $EPICS_BASE))
BASE=${BASE#*base-}
fi
if [ "${BASE#3.14.}" = "$BASE" -a "${BASE#3.15.}" = "$BASE" ]
then
    echo "Cannot find any EPICS 3.14 or 3.15 version" >&2
    echo "Try setting EPICS_BASE environment variable to full path" >&2
    exit 1
fi
export BASE
BASEMINOR=${BASE#3.}
BASEPATCH=${BASEMINOR#*.}
BASEMINOR=${BASEMINOR%.*}

# IOC name derives from hostname
# (trailing possible '\r' under cygwin)
IOC=$(hostname|tr -d '\r')
# trailing possible domain name
IOC=${IOC%%.*}
# or get IOC name from start directory following PSI convention
if [ $(basename $(dirname $PWD)) = "ioc" ]
then
    IOC=$(basename $PWD)
fi
export IOC

# Check for 64 bit versions, default to 32 bit
if [ ! -d $EPICS_BASE/lib/${EPICS_HOST_ARCH} -a -d $EPICS_BASE/lib/${EPICS_HOST_ARCH%_64} ]
then
    echo "No 64 bit EPICS installation found. Defaulting to 32 bit"
    EPICS_HOST_ARCH=${EPICS_HOST_ARCH%_64}
fi

# setup search path for require
ODIR=O.${BASE}_$EPICS_HOST_ARCH
EPICS_DRIVER_PATH=.:bin:snl:../snl:$ODIR:src/$ODIR:snl/$ODIR:../snl/$ODIR:${EPICS_DRIVER_PATH#:}

#Special PSI: find installation base for libs from working directory
D=$(rp $PWD)
I=${D%/iocBoot/*}
if [ $I != $D ]
then
    INSTBASE=$I
    export INSTBASE
fi

EPICS_DRIVER_PATH=${EPICS_DRIVER_PATH%:}:${EPICS_MODULES:=/ioc/modules}:${INSTBASE:=/work}/iocBoot/R$BASE/$EPICS_HOST_ARCH

# convert for win32-x86 arch
if [ ${EPICS_HOST_ARCH#win32-} != $EPICS_HOST_ARCH ]
then 
    EPICS_DRIVER_PATH=$(cygpath -wp $EPICS_DRIVER_PATH)
    DBD=$(cygpath -wp $DBD)
fi
if [ ${EPICS_HOST_ARCH#cygwin-} != $EPICS_HOST_ARCH ]
then 
    DBD=$(cygpath -wp $DBD)
fi

export EPICS_DRIVER_PATH

subst () {
    subst=""
    while [ "$#" -gt 1 ]
    do
        case $2 in 
            ( *=* )
                subst="$subst,$2"; shift
                ;;
            ( * )
                break
                ;;
        esac
    done
    echo ${subst#,}
}

loadFiles () {
while [ "$#" -gt 0 ]
do
  file=$1
  case $file in
    ( -h | "-?" | -help | --help )
        help
        ;;
    ( -v | -ver | --ver | -version | --version )
        version
        ;;
    ( @* )              
        loadFiles $(cat ${file#@})
        ;;
    ( *.db | *.template)
        subst=""
        while [ "$#" -gt 1 ]
        do
            case $2 in 
                ( *=* )
                    subst="$subst,$2"; shift
                    ;;
                ( * )
                    break
                    ;;
            esac
        done
        echo "dbLoadRecords \"$file\",\"${subst#,}\""
        ;;
    ( *.subs | *.subst )
        echo "dbLoadTemplate \"$file\""
        ;;
    ( *.dbd )
        # some dbd files must be loaded before main to take effect
        echo "dbLoadDatabase \"$file\",\"$DBD\""
        ;;
    ( *.so )             
        if [ $BASEMINOR -ge 15 -o $BASEPATCH -ge 12 ]
        then
            echo "dlload \"$file\""
        else
            echo "ld \"$file\""
        fi
        ;;
    ( -c )               
        shift
        case $1 in
        ( seq* )
            if [ "$init" != NO ]
            then
                echo "iocInit"
                init=NO
            fi
            ;;
        ( iocInit )
            init=NO
            ;;
        esac
        echo $1
        ;;
    ( -s )
        shift
        if [ "$init" != NO ]
        then
            echo "iocInit"
            init=NO
        fi
        echo "seq $1"
        ;;
    ( -r )               
        shift
        echo "require $1"
        ;;
    ( -n )
        shift
        IOC="$1"
        ;;
    ( -3.* )
        echo "Version $file must be first argument" >&2
        exit 1
        ;;
    ( -32 )
        echo "-32 option must come before all others (except -3.xx.yy)" >&2
        exit 1
        ;;
    ( -* )
        {
        echo "unknown option $1"
        echo "try: $(basename $0) --help"
        } >&2
        exit 1
       ;;
    ( * )                
        echo "< \"$file\""
        if grep -q iocInit $file; then init=NO; fi
        ;;
  esac
  shift
done
}

startup=/tmp/iocsh.startup.$$
trap "stty sane; echo; rm -f $startup" EXIT TERM KILL
{
echo "# date=\"$(date)\""
echo "# user=\"${USER:-$(whoami)}\""
for var in PWD BASE EPICS_HOST_ARCH SHELLBOX EPICS_CA_ADDR_LIST EPICS_DRIVER_PATH
do
    echo "# $var=\"${!var}\""
done

if [ $BASEMINOR -ge 15 -o $BASEPATCH -ge 12 ]
then
    EXE=$EPICS_BASE/bin/$EPICS_HOST_ARCH/softIoc
    ARGS="-D $EPICS_BASE/dbd/softIoc.dbd"
    # load "require" command
    LIBPREFIX=lib
    LIBPOSTFIX=.so
    if [ -d $EPICS_MODULES/${REQUIRE:=require} ]
    then # new module pool model
        REQUIRE_LIB=$EPICS_MODULES/$REQUIRE/${REQUIRE_VERSION:=$(cd $EPICS_MODULES/$REQUIRE; ls -1rvd *.*.* | head -n 1)}/R$BASE/lib/$EPICS_HOST_ARCH/$LIBPREFIX$REQUIRE$LIBPOSTFIX
        REQUIRE_DBD=$EPICS_MODULES/$REQUIRE/$REQUIRE_VERSION/R$BASE/dbd/$REQUIRE.dbd
    else # old driver pool model
        REQUIRE=misc${REQUIRE_VERSION:+-}$REQUIRE_VERSION
        REQUIRE_LIB=$INSTBASE/iocBoot/R$BASE/$EPICS_HOST_ARCH/$LIBPREFIX$REQUIRE$LIBPOSTFIX
        REQUIRE_DBD=$INSTBASE/iocBoot/R$BASE/dbd/$REQUIRE.dbd
    fi
    if [ ! -f "$REQUIRE_LIB" ]
    then
        echo "Library $REQUIRE_LIB not found." >&2
        echo "Command 'require' is not available." >&2
    else
        echo "dlload $REQUIRE_LIB"
        echo "dbLoadDatabase $REQUIRE_DBD"
        echo "${REQUIRE%-*}_registerRecordDeviceDriver"
    fi
else
    # get rid of the compiled-in rpath because at PSI that is a link pointing to current EPICS version.
    LOADER=/lib/ld-linux.so.2
    LOADERARGS="--library-path $EPICS_BASE/lib/$EPICS_HOST_ARCH --inhibit-rpath ''"
    APP=ioc
    EXE=$EPICS_EXTENSIONS/bin/$EPICS_HOST_ARCH/$APP
    DBD=$EPICS_EXTENSIONS/dbd
    echo "dbLoadDatabase \"$APP.dbd\",\"$DBD\""
    echo "${APP}_registerRecordDeviceDriver(pdbbase)"
fi
echo "require misc $MISC_VERSION"
loadFiles "$@"
if [ "$init" != NO ]
then
    echo "iocInit"
fi
if [ "$SHELLBOX" ]
then
  PATH=$PATH:/home/ioc/bin
  export BCAST_ADDR=$(/sbin/ifconfig | awk -F '[ :]+' '/Bcast/ {print $6; exit}')
  echo "! rm -f /tmp/${IOC}.dbl"
  echo 'dbl "","RTYP DESC" > /tmp/${IOC}.dbl'
  echo "! dbl2odb.sh ${IOC} \"$BCAST_ADDR\" \"$EPICS_CA_SERVER_PORT\""
  echo "! rm -f /tmp/${IOC}.libs"
  echo "libversionShow > /tmp/${IOC}.libs"
  echo "! upload_libinfo.py -i ${IOC} -l /tmp/${IOC}.libs"
fi
echo 'epicsEnvSet IOCSH_PS1,"${IOC}> "'
} > $startup

# convert startup script file name for win32-x86
if [ ${EPICS_HOST_ARCH#win32-} != $EPICS_HOST_ARCH ]
then
    startup=`cygpath -w $startup`
fi

if [ ${EPICS_HOST_ARCH#win32-} != $EPICS_HOST_ARCH -o ${EPICS_HOST_ARCH#cygwin-} != $EPICS_HOST_ARCH ]
then 
    PATH=$INSTBASE/iocBoot/R$BASE/$EPICS_HOST_ARCH:$EPIC_BASE/bin/$EPICS_HOST_ARCH:$EPICS_BASE/../seq/bin/$EPICS_HOST_ARCH:$PATH
fi

echo $EXE $ARGS $startup
ulimit -c unlimited
eval "$LOADER $LOADERARGS $EXE" $ARGS "$startup" 2>&1