config: Use TOML

TOML is simple for users, and it is used in notably projects like
rustlang.  It also provides comments!

1 files changed, 19 insertions, 2 deletions

diff --git a/internal/url.go b/internal/url.go
index 3a8d20a..d7a712d 100644
--- a/internal/url.go
+++ b/internal/url.go
@@ -2,10 +2,27 @@ package internal
 
 import "net/url"
 
-func MustURL(arg string) *url.URL {
+type URL struct {
+	*url.URL
+}
+
+func (u *URL) MarshalText() ([]byte, error) {
+	return []byte(u.URL.String()), nil
+}
+
+func (u *URL) UnmarshalText(buf []byte) error {
+	var err error
+	u.URL, err = url.Parse(string(buf))
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func MustURL(arg string) *URL {
 	u, err := url.Parse(arg)
 	if err != nil {
 		panic(err)
 	}
-	return u
+	return &URL{u}
 }