Added README, Licence, and fixed issue with modules

1 files changed, 17 insertions, 12 deletions

diff --git a/snap/parsing.go b/snap/parsing.go
index fcacec9..0d1f09f 100644
--- a/snap/parsing.go
+++ b/snap/parsing.go
@@ -18,11 +18,6 @@ func parseEscaped(snapish string) *Relative {
 	if isEscaped(snapish) {
 		snapshot := strings.Trim(snapish, `"`);
 
-		if(snapshot == "") {
-			die.Fatal("Snapshot cannot be empty \"\"")
-		
-		}
-
 		return &Relative {
 			snapshot: snapshot,
 		}
@@ -69,7 +64,7 @@ func parseRelativeSyntax(snapish, directionToken string) *Relative {
 	}
 }
 
-func ToRelative(snapish string) * Relative {
+func toRelative(snapish string) * Relative {
 	if ref := parseEscaped(snapish); ref != nil {
 		return ref;
 	}
@@ -78,7 +73,7 @@ func ToRelative(snapish string) * Relative {
 		return ref;
 	}
 
-	if ref := parseRelativeSyntax(snapish, "^"); ref != nil {
+	if ref := parseRelativeSyntax(snapish, "-"); ref != nil {
 		ref.offset = -ref.offset;
 		return ref;
 	}
@@ -88,16 +83,26 @@ func ToRelative(snapish string) * Relative {
 	};
 }
 
-func ParseDiff(snapdiff string) (fromRel, toRel *Relative) {
-	snapishes := strings.Split(snapdiff, "..")
+func ToRelative(snapish string) * Relative {
+	rel := toRelative(snapish)
+
+	if rel.snapshot == "" {
+		die.Fatal("Please provide a snapshot. You can use @ for the current filesystem and $ for the last snapshot.")
+	}
+
+	return rel
+}
+
+func ParseDiff(snapishdiff string) (fromRel, toRel *Relative) {
+	snapishes := strings.Split(snapishdiff, "..")
 
-	if(len(snapishes) > 2) {
+	if len(snapishes) > 2 {
 		die.Fatal("Cannot diff more than two snapshots");
 	}
 
 	fromRel = ToRelative(snapishes[0])
-	toRel = &Relative{}
-	if(len(snapishes) == 2) {	
+	toRel = &Relative{snapshot: "@"}
+	if len(snapishes) == 2 {
 		toRel = ToRelative(snapishes[1])
 	}