#! /bin/sh -e

# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License.  You may obtain a copy of
# the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
# License for the specific language governing permissions and limitations under
# the License.

# Bootstrap the pristine source ready for distribution.

SCRIPT_OK=0
SCRIPT_ERROR=1

CHANGELOG_PREDICATE=true

ACINCLUDE_FILE="acinclude.m4"
ACINCLUDE_IN_FILE="acinclude.m4.in"
AC_CHECK_ICU_COMPRESSED_FILE="build-contrib/ac_check_icu.m4_2007-09-12.gz"
AUTHORS_FILE="authors.xml"
BUILD_AUX_DIRECTORY="build-aux"
CHANGELOG_FILE="ChangeLog"
CONFIG_GUESS_COMPRESSED_FILE="build-contrib/config.guess_2007-09-12.gz"
CONFIG_GUESS_FILE="build-aux/config.guess"
CONFIG_SUB_COMPRESSED_FILE="build-contrib/config.sub_2007-09-12.gz"
CONFIG_SUB_FILE="build-aux/config.sub"
M4_DIRECTORY="m4"
M4_AC_CHECK_ICU_FILE="m4/ac_check_icu.m4"
REPOSITORY_URI="http://svn.apache.org/repos/asf/incubator/couchdb/trunk"

ACLOCAL_EXECUTABLE=$(which aclocal || true)
AUTOCONF_EXECUTABLE=$(which autoconf || true)
AUTOHEADER_EXECUTABLE=$(which autoheader || true)
AUTOMAKE_EXECUTABLE=$(which automake || true)
GLIBTOOLIZE_EXECUTABLE=$(which glibtoolize || true)
LIBTOOLIZE_EXECUTABLE=$(which libtoolize || true)
SVN_EXECUTABLE=$(which svn || true)
SVN2CL_EXECUTABLE=$(which svn2cl || true)

basename=$(basename $0)

extract_configuration_variable () {
    # Extract variables from the local M4 configuration.

    variable_name=$1
    temporary_file=$(mktemp)
    if [ $? -ne 0 ]; then
        echo "Error: Unable to create a temporary file."
        exit $SCRIPT_ERROR
    fi
    echo "changequote(\`[', \`]')" > $temporary_file
    sed "s/m4_//" < $ACINCLUDE_IN_FILE >> $temporary_file
    echo $variable_name >> $temporary_file
    m4 $temporary_file | grep -v "^$"
    rm -f $temporary_file
}

display_version () {
    # Display version and copyright information.

    package_name=$(extract_configuration_variable LOCAL_PACKAGE_NAME)
    version=$(extract_configuration_variable LOCAL_VERSION)
    cat << EOF
$basename - $package_name $version

Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this file except in compliance with the License.  You may obtain a copy of the
License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed
under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.  See the License for the
specific language governing permissions and limitations under the License.
EOF
}

display_help () {
    # Display a short description of the script's behaviour.

    bug_uri=$(extract_configuration_variable LOCAL_BUG_URI)
    cat << EOF
Usage: $basename [OPTION]...

The $basename script bootstraps the pristeen source so that it can be built.

The exit status is 0 for success or 1 for failure.

Options:

  -h  display a short help message and exit
  -v  display version information and exit
  -C  do not generate a ChangeLog from Subversion

Environment variables:

  REPOSITORY_REVISION  manual override for revision information

Report bugs at <$bug_uri>.
EOF
}

display_error () {
    # Display a short instruction referring users to further documentation.

    if test -n "$1"; then
        echo $1 >&2
    fi
    echo >&2
    echo "Try \`"$basename" -h' for more information." >&2
    exit $SCRIPT_ERROR
}

generate_dummy_changelog () {
    # Generate a dummy ChangLog file.

    echo "Warning: Generating a dummy ChangeLog file."
    touch $CHANGELOG_FILE
}

check_svn_environment () {
    # Check the Subversion environment for sanity.

    if test -z "$SVN_EXECUTABLE"; then
        echo "Warning: Unable to find the svn command."
        return $SCRIPT_ERROR
    fi
    if test -n "$REPOSITORY_REVISION"; then
        return
    fi
    if test -n "$($SVN_EXECUTABLE info . 2> /dev/null)"; then
       SVN_CHECKOUT_BOOLEAN="true"
    fi > /dev/null
    if test "$SVN_CHECKOUT_BOOLEAN" != "true"; then
        echo "Warning: Unable to determine checkout information."
    fi
}

generate_changelog () {
    # Generate the ChangLog file using the Subversion repository.

    if test "$SVN_CHECKOUT_BOOLEAN" = "true"; then
        SVN2CL_COMMAND_ARGUMENT="."
    fi
    if test -n "$REPOSITORY_REVISION"; then
        SVN2CL_COMMAND_ARGUMENT="--revision $REPOSITORY_REVISION:1 $REPOSITORY_URI"
    fi
    if test -z "$SVN2CL_COMMAND_ARGUMENT"; then
        return
    fi
    if test ! -x "$SVN2CL_EXECUTABLE"; then
        echo "Warning: Unable to find the svn2cl command."
        generate_dummy_changelog
    else
        echo "Generating \`"$CHANGELOG_FILE"' (may take a while)"
        $SVN2CL_EXECUTABLE --authors=$AUTHORS_FILE $SVN2CL_COMMAND_ARGUMENT
    fi
}

generate_acinclude () {
    # Generate the acinclude.m4 file using the Subversion repository.

    release_code=$(sed -e "s/\[//g" -e "s/\]//g" -e "s/(//g" -e "s/)//g" \
        < $ACINCLUDE_IN_FILE | awk "/LOCAL_VERSION_STAGE, /{print \$2}")
    repository_boolean=false
    if test -n "$REPOSITORY_REVISION" -o "$SVN_CHECKOUT_BOOLEAN" = "true"; then
        repository_boolean=true
    fi
    if test -z "$release_code" -o "$repository_boolean" = "false"; then
        sed "s/%release%//" < $ACINCLUDE_IN_FILE > $ACINCLUDE_FILE
    else
        if test "$SVN_CHECKOUT_BOOLEAN" = "true"; then
            revision_number=$($SVN_EXECUTABLE info . | \
                awk "/Revision:/{print \$2}")
        fi
        if test -n "$REPOSITORY_REVISION"; then
            revision_number="$REPOSITORY_REVISION"
        fi
        sed "s/%release%/$revision_number/" \
            < $ACINCLUDE_IN_FILE > $ACINCLUDE_FILE
    fi
}

process_file_collection () {
    # Process files required to complete the bootstrap.

    echo "Installing \`"$BUILD_AUX_DIRECTORY"'"
    mkdir -p $BUILD_AUX_DIRECTORY
    echo "Installing \`"$CONFIG_GUESS_FILE"'"
    gzip --decompress --stdout \
        $CONFIG_GUESS_COMPRESSED_FILE > $CONFIG_GUESS_FILE
    echo "Installing \`"$CONFIG_SUB_FILE"'"
    gzip --decompress --stdout \
        $CONFIG_SUB_COMPRESSED_FILE > $CONFIG_SUB_FILE
    echo "Installing \`"$M4_DIRECTORY"'"
    mkdir -p $M4_DIRECTORY
    echo "Installing \`"$M4_AC_CHECK_ICU_FILE"'"
    gzip --decompress --stdout \
        $AC_CHECK_ICU_COMPRESSED_FILE > $M4_AC_CHECK_ICU_FILE
}

run_aclocal () {
    # Run the correct version of aclocal.

    if test -x "$ACLOCAL_EXECUTABLE"; then
        echo "Running $ACLOCAL_EXECUTABLE"
        $ACLOCAL_EXECUTABLE -I m4
    else
        echo "Can't find aclocal"
        exit $SCRIPT_ERROR
    fi
}

run_libtoolize () {
    # Run the correct version of libtoolize.

    if test -x "$LIBTOOLIZE_EXECUTABLE"; then
        echo "Running $LIBTOOLIZE_EXECUTABLE"
        $LIBTOOLIZE_EXECUTABLE -f -c
    else
        if test -x "`which $GLIBTOOLIZE_EXECUTABLE`"; then
            echo "Running $GLIBTOOLIZE_EXECUTABLE"
            $GLIBTOOLIZE_EXECUTABLE -f -c
        else
            echo "Can't find libtoolize or glibtoolize"
            exit $SCRIPT_ERROR
        fi
    fi
}

run_autoheader () {
    # Run the correct version of autoheader.

    if test -x "$AUTOHEADER_EXECUTABLE"; then
        echo "Running $AUTOHEADER_EXECUTABLE"
        $AUTOHEADER_EXECUTABLE -f
    else
        echo "Can't find autoheader"
        exit $SCRIPT_ERROR
    fi
}

run_automake () {
    # Run the correct version of automake.

    AUTOMAKE_OPTION_COLLECTION=""
    if test -x "$AUTOMAKE_EXECUTABLE"; then
        echo "Running $AUTOMAKE_EXECUTABLE"
        $AUTOMAKE_EXECUTABLE -f -c -a --gnits
    else
        echo "Can't find automake"
        exit $SCRIPT_ERROR
    fi
}

run_autoconf () {
    # Run the correct version of autoconf.

    if test -x "$AUTOCONF_EXECUTABLE"; then
        echo "Running $AUTOCONF_EXECUTABLE"
        $AUTOCONF_EXECUTABLE -f
    else
        echo "Can't find autoconf"
        exit $SCRIPT_ERROR
    fi
}

run_command_collection () {
    # Run commands required to complete the bootstrap.

    run_libtoolize
    run_aclocal
    run_autoheader
    run_automake
    run_autoconf
    cat << EOF

You have bootstrapped Apache CouchDB. Time to relax.

Run \`./configure' to configure the source before you install.
EOF
}

parse_script_option_list () {
    # Parse the script option list and take the appropriate action.

    if ! argument_list=$(getopt vhC $@); then
        display_error
    fi
    eval set -- "$argument_list"
    while [ $# -gt 0 ]; do
        case "$1" in
            -v) shift; display_version; exit $SCRIPT_OK;;
            -h) shift; display_help; exit $SCRIPT_OK;;
            -C) shift; CHANGELOG_PREDICATE=false;;
            --) shift; break;;
            *) display_error "Unknown option: $1" >&2;;
        esac
    done
    cd $(dirname $0)
    process_file_collection
    check_svn_environment || true
    if test "$CHANGELOG_PREDICATE" = "true"; then
        generate_changelog
    else
        generate_dummy_changelog
    fi
    generate_acinclude
    run_command_collection
}

parse_script_option_list $@