*: Use URL params to specify commits/branches/tags

1 files changed, 42 insertions, 0 deletions

diff --git a/url_misc.go b/url_misc.go
new file mode 100644
index 0000000..906e06e
--- /dev/null
+++ b/url_misc.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+	"errors"
+	"net/http"
+	"net/url"
+)
+
+var (
+	err_duplicate_ref_spec = errors.New("Duplicate ref spec")
+	err_no_ref_spec = errors.New("No ref spec")
+)
+
+func get_param_ref_and_type(r *http.Request) (ref_type, ref string, err error) {
+	qr := r.URL.RawQuery
+	q, err := url.ParseQuery(qr)
+	if err != nil {
+		return
+	}
+	done := false
+	for _, _ref_type := range []string{"commit", "branch", "tag"} {
+		_ref, ok := q[_ref_type]
+		if ok {
+			if done {
+				err = err_duplicate_ref_spec
+				return
+			} else {
+				done = true
+				if len(_ref) != 1 {
+					err = err_duplicate_ref_spec
+					return
+				}
+				ref = _ref[0]
+				ref_type = _ref_type
+			}
+		}
+	}
+	if !done {
+		err = err_no_ref_spec
+	}
+	return
+}