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#!/bin/sh
#
# Find the (sub-)schema that best matches a desired version.
#
# Version numbers are assumed to be in the format X.Y,
# where X and Y are integers, and Y is no more than 3 digits,
# or the special value "next".
#
# (Sub-)schema name (e.g. "resources")
base="$1"; shift
# Desired version (e.g. "1.0" or "next")
target="$1"; shift
# If not empty, append the best match as an XML externalRef to this file
# (otherwise, just echo the best match). Using readlink allows building
# from a different directory.
destination="$(readlink -f "$1")"; shift
# Arbitrary text to print before XML (generally spaces to indent)
prefix="$1"; shift
# Allow building from a different directory
cd "$(dirname $0)"
list_candidates() {
ls -1 "${1}.rng" "${1}"-[0-9]*.rng 2>/dev/null
}
version_from_filename() {
vff_filename="$1"
case "$vff_filename" in
*-*.rng)
echo "$vff_filename" | sed -e 's/.*-\(.*\).rng/\1/'
;;
*)
# special case for bare ${base}.rng, no -0.1's around anyway
echo 0.1
;;
esac
}
filename_from_version() {
ffv_version="$1"
ffv_base="$2"
if [ "$ffv_version" = "0.1" ]; then
echo "${ffv_base}.rng"
else
echo "${ffv_base}-${ffv_version}.rng"
fi
}
# Convert version string (e.g. 2.10) into integer (e.g. 2010) for comparisons
int_version() {
echo "$1" | awk -F. '{ printf("%d%03d\n", $1,$2); }';
}
best="0.0"
for rng in $(list_candidates "${base}"); do
case ${rng} in
${base}-${target}.rng)
# We found exactly what was requested
best=${target}
break
;;
*-next.rng)
# "Next" schemas cannot be a best match unless directly requested
;;
*)
v=$(version_from_filename "${rng}")
if [ $(int_version "${v}") -gt $(int_version "${best}") ]; then
# This version beats the previous best match
if [ "${target}" = "next" ]; then
best=${v}
elif [ $(int_version "${v}") -lt $(int_version "${target}") ]; then
# This value is best only if it's still less than the target
best=${v}
fi
fi
;;
esac
done
if [ "$best" != "0.0" ]; then
found=$(filename_from_version "$best" "$base")
if [ -z "$destination" ]; then
echo "$(basename $found)"
else
echo "${prefix}<externalRef href=\"$(basename $found)\"/>" >> "$destination"
fi
exit 0
fi
exit 1
|
