#!/bin/sh
set -e

if test "x$GDAL_SHA1SUM" != "x" -a "x$GDAL_RELEASE_DATE" != "x"; then
        if test -f gdal_version.h; then
                cp gdal_version.h gdal_version.h.bak
        else
                touch gdal_version.h.bak
        fi
        echo "/* This is a generated file from gdal_version.h.in. DO NOT MODIFY !!!! */" > gdal_version.h.new
        echo "" >> gdal_version.h.new
        cat gdal_version.h.in >> gdal_version.h.new
        sed -i.bak "s/dev/dev\\-$GDAL_SHA1SUM/" gdal_version.h.new && rm gdal_version.h.new.bak
        sed -i.bak "s/define GDAL_RELEASE_DATE.*/define GDAL_RELEASE_DATE     $GDAL_RELEASE_DATE/" gdal_version.h.new && rm gdal_version.h.new.bak
        diff -u gdal_version.h.new gdal_version.h.bak >/dev/null || \
            (echo "Update gdal_version.h"; \
             cp gdal_version.h.new gdal_version.h)
        rm -f gdal_version.h.bak
        rm -f gdal_version.h.new
elif git log -1 >/dev/null 2>/dev/null && grep dev gdal_version.h.in >/dev/null; then
        REV=$(git log -1 --format="%h")
        DATE=$(git log -1 --date=format:'%Y%m%d' --format="%ad" 2>/dev/null) || DATE=""
        if git status --porcelain -uno | grep . >/dev/null; then REV="$REV-dirty"; fi
        if test -f gdal_version.h; then
                cp gdal_version.h gdal_version.h.bak
        else
                touch gdal_version.h.bak
        fi
        echo "/* This is a generated file from gdal_version.h.in. DO NOT MODIFY !!!! */" > gdal_version.h.new
        echo "" >> gdal_version.h.new
        cat gdal_version.h.in >> gdal_version.h.new
        sed -i.bak "s/dev/dev\\-$REV/" gdal_version.h.new && rm gdal_version.h.new.bak
        if test "$DATE" != ""; then
                sed -i.bak "s/define GDAL_RELEASE_DATE.*/define GDAL_RELEASE_DATE     $DATE/" gdal_version.h.new && rm gdal_version.h.new.bak
        fi
        diff -u gdal_version.h.new gdal_version.h.bak >/dev/null || \
            (echo "Update gdal_version.h"; \
             cp gdal_version.h.new gdal_version.h)
        rm -f gdal_version.h.bak
        rm -f gdal_version.h.new
else
        echo "/* This is a generated file from gdal_version.h.in. DO NOT MODIFY !!!! */" > gdal_version.h.new
        echo "" >> gdal_version.h.new
        cat gdal_version.h.in >> gdal_version.h.new
        diff -u gdal_version.h.new gdal_version.h 2>/dev/null >/dev/null || \
            (echo "Update gdal_version.h"; \
             cp gdal_version.h.new gdal_version.h)
        rm -f gdal_version.h.new
fi