[gnome-code-assistance] Check for specific minimum version of sass

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 295c9495e63b17e2c9e981a7b1e9c78aef9ca41d
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Sat Jan 10 14:08:42 2015 +0100

    Check for specific minimum version of sass

 configure.ac |   18 +++++++++++++++---
 1 files changed, 15 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 866c5d5..d76adeb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -268,9 +268,21 @@ fi
 ruby_sass=
 
 if test "x$enable_css" = "xyes"; then
-       $RUBY -rsass -e '' 2>/dev/null
-       if test $? -eq 0 ; then
-               ruby_sass=yes
+       AC_MSG_CHECKING([system provided sass])
+
+       MAJOR=`$RUBY -rsass -e 'puts Sass.version[[:major]]' 2>/dev/null`
+
+       if test $? -eq 0; then
+               MINOR=`$RUBY -rsass -e 'puts Sass.version[[:minor]]' 2>/dev/null`
+
+               if test "$MAJOR" -lt 3 || (test "$MAJOR" = "3" && test "$MINOR" -lt 3); then
+                       AC_MSG_RESULT([no (required sass version >= 3.3 not found), using vendored sass gem])
+               else
+                       ruby_sass=yes
+                       AC_MSG_RESULT([yes, found sass $MAJOR.$MINOR])
+               fi
+       else
+               AC_MSG_RESULT([no, using vendored sass gem])
        fi
 fi