Use default fallback version if built outside of git repo (#92)

Author: edenhill

configure.kafkacat

@@ -2,7 +2,7 @@
 #
 
 mkl_require good_cflags
-mkl_require gitversion as KAFKACAT_VERSION
+mkl_require gitversion as KAFKACAT_VERSION default 1.3.1
 
 
 function checks {

mklove/modules/configure.gitversion

@@ -6,14 +6,24 @@
 #   VARIABLE_NAME
 #
 # Example: Set version in variable named "MYVERSION":
-#   mkl_require gitversion as MYVERSION
+#   mkl_require gitversion as MYVERSION [default DEFVERSION]
 
 if [[ $1 == "as" ]]; then
-    __MKL_GITVERSION_VARNAME="$2"
+    shift
+    __MKL_GITVERSION_VARNAME="$1"
+    shift
 else
     __MKL_GITVERSION_VARNAME="VERSION"
 fi
 
+if [[ $1 == "default" ]]; then
+    shift
+    __MKL_GITVERSION_DEFAULT="$1"
+    shift
+fi
+
+
 function checks {
-    mkl_allvar_set "gitversion" "$__MKL_GITVERSION_VARNAME" "$(git describe --abbrev=6 --tags HEAD --always)"
+    mkl_allvar_set "gitversion" "$__MKL_GITVERSION_VARNAME" \
+                   "$(git describe --abbrev=6 --tags HEAD --always 2>/dev/null || echo $__MKL_GITVERSION_DEFAULT)"
 }