#!/bin/bash
#-------------------------------------------------------------------------------
# (C) British Crown Copyright 2006-17 Met Office.
#
# This file is part of FCM, tools for managing and building source code.
#
# FCM 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.
#
# FCM 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 FCM. If not, see <http://www.gnu.org/licenses/>.
#-------------------------------------------------------------------------------
# NAME
#     trac_hook
#
# SYNOPSIS
#     . trac_hook
#     trac_hook "$REPOS" "$REV" added|modified
#
# DESCRIPTION
#   Provide a function called "trac_hook", which updates the corresponding Trac
#   environment, for post-commit or post-revprop-change.
#
# ENVIRONMENT VARIABLES
#   FCM_SVN_HOOK_TRAC_ROOT_DIR
#     The root directories of Trac environments. Update corresponding Trac
#     environment if specified.
#   FCM_SVN_HOOK_REPOS_SUFFIX
#     A suffix that should be removed from the basename of REPOS to get the
#     name of the Trac environment. (Default is "".)
#-------------------------------------------------------------------------------

trac_hook() {
    local REPOS=$1
    local REV=$2
    local TRAC_ACT=$3
    if which trac-admin 1>/dev/null 2>&1 \
        && [[ -n ${FCM_SVN_HOOK_TRAC_ROOT_DIR:-} ]]
    then
        local TRAC_NAME=$(basename "$REPOS")
        if [[ -n ${FCM_SVN_HOOK_REPOS_SUFFIX:-} ]]; then
            TRAC_NAME=${NAME%$FCM_SVN_HOOK_REPOS_SUFFIX}
        fi
        local TRAC_DIR="$FCM_SVN_HOOK_TRAC_ROOT_DIR/$TRAC_NAME"
        if [[ -d "$TRAC_DIR" ]]; then
            if [[ $(trac-admin --version) == trac-admin\ 0.11* ]]; then
                # N.B. "added" was automatic on access
                if [[ "$TRAC_ACT" == 'modified' ]]; then
                    echo "trac-admin $TRAC_DIR resync $REV"
                    trac-admin "$TRAC_DIR" resync "$REV" >/dev/null
                fi
            else
                echo "trac-admin $TRAC_DIR changeset $TRAC_ACT $REPOS $REV"
                trac-admin "$TRAC_DIR" changeset "$TRAC_ACT" "$REPOS" "$REV"
            fi
        fi
    fi
}
