# Function library for buildpkg build.sh
# This is only for build.sh helper functions.
# Copyright (C) 2003 Jens-Henrik Leonhard Jensen
# Copyright (C) 2003-2008,2010,2012 Tom G. Christensen <tgc@jupiterrise.com>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Written by Tom G. Christensen <tgc@jupiterrise.com>.

# Automatic logging is enabled by default
autolog=1
# Don't log these methods
nolog="prep distclean"
# date format string
dateformat="%Y%m%d%H%M%S"

# Define script functions and register them
METHODS=""
reg() {
    METHODS="$METHODS $1"
}

all()
{
    for METHOD in $METHODS
    do
        case $METHOD in
             all*|*clean|check) ;;
             *) $METHOD
                ;;
        esac
    done

}

usage() {
    echo Usage $0 "{"$(echo $METHODS | tr " " "|")"}"
    exit 1
}

build_sh() {
    # Register internal functions last
    # The empty reg is trickery to get exactly 1 space at each end of the METHODS string
    reg all
    reg
    #
    local OK=0
    for METHOD in $*
    do
	METHOD=" $METHOD *"
	if [ "${METHODS%$METHOD}" == "$METHODS" ] ; then
	    usage
	fi
	OK=1
    done

    if [ $OK = 0 ] ; then
	usage;
    fi

    for METHOD in $*
    do
	( log_start $METHOD; $METHOD; log_stop $METHOD )
    done
}

# Write out a timestamp
timestamp()
{
    date +$dateformat
}

# Start a logfile
# Note this should only be used *after* the buildpkg.* libraries
# have been sourced, otherwise most of the variables used to construct
# the logfile name are undefined.
log_start()
{
    local func=$1
    build_sh_logfile=${topdir}-${version}_${pkgver}-${os}-${arch}-${func}-$(timestamp).log

    if [ $autolog -eq 1 ]; then
	if [ -z "$(${__expr} "$nolog" : ".*\($func\)")" ]; then
	    # save stdout and stderr to file descriptors 3 and 4
	    # then redirect them to $build_sh_logfile
	    echo "Opening logfile: $build_sh_logfile"
	    exec 3>&1 4>&2 >$build_sh_logfile 2>&1
	    # Log a timestamp
	    timestamp
	    # Get information about the compiler into the logfile
	    identify_compiler log
	else # $nolog function, just add a timestamp
	    timestamp
	fi
    fi
}

# Stop logging
log_stop()
{
    local func=$1
    if [ $autolog -eq 1 -a -z "$(${__expr} "$nolog" : ".*\($func\)")" ]; then
	# Log a timestamp
	timestamp
	# restore stdout and stderr
	exec 1>&3 2>&4
	echo "Closing logfile: $build_sh_logfile"
    fi
}