update version hack to work on partial repositories

Instead of asking for the last 100 patches, we just get the first 500
lines of output from darcs changes (ugh, better ideas welcome).

diff --git a/aclocal.m4 b/aclocal.m4
index 87149a7..2649df7 100644 (file)
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -974,12 +974,15 @@ if test "$RELEASE" = "NO"; then
     AC_MSG_CHECKING([for GHC version date])
     if test -d _darcs; then
         changequote(, )dnl
-        ver_date=`darcs changes --last=100 --xml | grep 'date=' | sed "s/^.*date='\([0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]\).*$/\1/g" | sort -n | tail -1`
+        ver_date=`darcs changes --quiet --no-summary --xml | head -500 | grep 'date=' | sed "s/^.*date='\([0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]\).*$/\1/g" | sort -n | tail -1`
+        if echo $ver_date | grep '^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$' 2>&1 >/dev/null; then true; else
         changequote([, ])dnl
+                AC_MSG_ERROR([failed to detect version date: check that darcs is in your path])
+        fi
         PACKAGE_VERSION=${PACKAGE_VERSION}.$ver_date
         AC_MSG_RESULT($PACKAGE_VERSION)
     elif test -f VERSION; then
-        PACKAGE_VERSION=`cat VERSION`        
+        PACKAGE_VERSION=`cat VERSION`
         AC_MSG_RESULT($PACKAGE_VERSION)
     else
         AC_MSG_ERROR([no version found])