rtree: add support for multiple URLs per remote

This requires changing the index format, which I'm using as an
opportunity to:

- move from YAML to JSON (so I can maybe kill the YAML parser dependency
  at some point)
- move the index file into standard XDG paths

1 files changed, 7 insertions, 6 deletions

diff --git a/internal/rtree/remote.go b/internal/rtree/remote.go
index afcdf9b..8c355a8 100644
--- a/internal/rtree/remote.go
+++ b/internal/rtree/remote.go
@@ -4,6 +4,7 @@
 package rtree
 
 import (
+	"encoding/json"
 	"net/url"
 	"path/filepath"
 	"regexp"
@@ -86,16 +87,16 @@ func (u RemoteURL) CheckoutPath() (string, error) {
 	return filepath.Join(parsed.Hostname(), parsed.Path), nil
 }
 
-// MarshalYAML implements the yaml.Marshaler interface.
-func (u RemoteURL) MarshalYAML() (any, error) {
+// MarshalJSON implements the json.Marshaler interface.
+func (u RemoteURL) MarshalJSON() ([]byte, error) {
 	//store URLs in the index in the canonical format
-	return u.CanonicalURL(), nil
+	return json.Marshal(u.CanonicalURL())
 }
 
-// UnmarshalYAML implements the yaml.Unmarshaler interface.
-func (u *RemoteURL) UnmarshalYAML(unmarshal func(any) error) error {
+// UnmarshalJSON implements the json.Unmarshaler interface.
+func (u *RemoteURL) UnmarshalJSON(buf []byte) error {
 	var s string
-	err := unmarshal(&s)
+	err := json.Unmarshal(buf, &s)
 	if err == nil {
 		*u = ParseRemoteURL(s)
 	}