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#!/bin/sh
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VERSION_FILE="scmversion.cpp"
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CURDIR=$(pwd)
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if [ "$(uname -s)" = "Darwin" ]; then
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  cd "$(dirname $(python3 -c 'import os,sys;print(os.path.realpath(sys.argv[1]))' "$0"))"
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else
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  cd $(dirname $(readlink -f $0))
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fi
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HASH=$(git rev-parse HEAD)
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BRANCH=$(git rev-parse --abbrev-ref HEAD | tr -d '\r\n')
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TAG=$(git describe --dirty | tr -d '\r\n')
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VERSION=$(echo "${TAG}" | sed -E 's/-g[0-9a-f]+//')
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DATE=$(git log -1 --date=iso8601-strict --format=%cd)
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cd $CURDIR
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SIGNATURE_LINE="// ${HASH} ${BRANCH} ${TAG} ${DATE}"
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if [ -f $VERSION_FILE ]; then
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  EXISTING_LINE=$(head -n1 $VERSION_FILE | tr -d '\n')
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  if [ "$EXISTING_LINE" = "$SIGNATURE_LINE" ]; then
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    echo "Signature matches, skipping writing ${VERSION_FILE}"
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    exit 0
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  fi
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fi
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echo "Writing ${VERSION_FILE}..."
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cat > $VERSION_FILE << EOF
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${SIGNATURE_LINE}
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const char* g_scm_hash_str = "${HASH}";
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const char* g_scm_branch_str = "${BRANCH}";
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const char* g_scm_tag_str = "${TAG}";
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const char* g_scm_version_str = "${VERSION}";
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const char* g_scm_date_str = "${DATE}";
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EOF
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