#!/bin/sh

# Print the aggregate SVN revision and date of the book, that is, the
# highest revnum (and the date corresponding to that revnum) from
# among the XML files that make up the book.  The output looks like:
#
#   3287  (21 Feb 2025)
#
# (We can't just use the stock 'svnversion' script for this, because
# we don't want a composite revision to result, and because we don't
# want to use the revisions of any files other than book XML files.)

XML_FILES="book.xml.in `grep '.xml"' en/book.xml | cut -d '"' -f 2`"

TMP_FILE=aggrevision-$$.tmp

> ${TMP_FILE}
for name in ${XML_FILES}; do
  svn info en/${name} | grep 'Last Changed Rev: ' | cut -d ' ' -f 4 \
  >> ${TMP_FILE}
done

REVNUM="`sort -nr ${TMP_FILE} | head -1`"
DATE="`svn log -q -r${REVNUM} | grep -v -- '-------------' | cut -d ' ' -f 5`"

echo "${REVNUM}  (`date -d ${DATE} +"%d %b %Y"`)"

rm ${TMP_FILE}