Give each const group a type

This allows us to restrict which constants the compiler will allow
through, and makes the sorting in the documentation better.

1 files changed, 6 insertions, 5 deletions

diff --git a/walk.go b/walk.go
index 1d560b6..6525db1 100644
--- a/walk.go
+++ b/walk.go
@@ -13,11 +13,12 @@ import (
 
 // RevWalk
 
+type SortType uint
 const (
-	SortNone        = C.GIT_SORT_NONE
-	SortTopological = C.GIT_SORT_TOPOLOGICAL
-	SortTime        = C.GIT_SORT_TIME
-	SortReverse     = C.GIT_SORT_REVERSE
+	SortNone SortType = C.GIT_SORT_NONE
+	SortTopological   = C.GIT_SORT_TOPOLOGICAL
+	SortTime          = C.GIT_SORT_TIME
+	SortReverse       = C.GIT_SORT_REVERSE
 )
 
 type RevWalk struct {
@@ -81,7 +82,7 @@ func (v *RevWalk) Iterate(fun RevWalkIterator) (err error) {
 	return nil
 }
 
-func (v *RevWalk) Sorting(sm uint) {
+func (v *RevWalk) Sorting(sm SortType) {
 	C.git_revwalk_sorting(v.ptr, C.uint(sm))
 }