Mod loading, disgusting struct parsing

core/interfaces.go

@@ -0,0 +1,15 @@
+package core
+// UpdateParsers stores all the update parsers that packwiz can use. Add your own update systems to this map.
+var UpdateParsers map[string]UpdateParser = make(map[string]UpdateParser)
+
+// UpdateParser takes an unparsed interface{}, and returns an Updater for a mod file
+type UpdateParser interface {
+	ParseUpdate(interface{}) (Updater, error)
+}
+
+// Updater checks for and does updates on a mod
+type Updater interface {
+	// DoUpdate returns true if an update was done, false otherwise
+	DoUpdate(Mod) (bool, error)
+}
+

core/mod.go

@@ -1,5 +1,9 @@
 package core
-import "github.com/BurntSushi/toml"
+import (
+	"errors"
+
+	"github.com/BurntSushi/toml"
+)
 
 // Mod stores metadata about a mod. This is written to a TOML file for each mod.
 type Mod struct {
@@ -13,7 +17,7 @@ type Mod struct {
 		HashFormat string `toml:"hash-format"`
 		Hash       string `toml:"hash"`
 	} `toml:"download"`
-	Update map[string]toml.Primitive `toml:"update"`
+	Update map[string]interface{} `toml:"update"`
 }
 
 // The three possible values of Side (the side that the mod is on) are "server", "client", and "both".
@@ -23,6 +27,28 @@ const (
 	UniversalSide = "both"
 )
 
+// LoadMod attempts to load a mod file from a path
+func LoadMod(modFile string) (Mod, error) {
+	var mod Mod
+	if _, err := toml.DecodeFile(modFile, &mod); err != nil {
+		return Mod{}, err
+	}
+	// Horrible reflection library to convert to Updaters
+	for k, v := range mod.Update {
+		updateParser, ok := UpdateParsers[k]
+		if ok {
+			updater, err := updateParser.ParseUpdate(v)
+			if err != nil {
+				return mod, err
+			}
+			mod.Update[k] = updater
+		} else {
+			return mod, errors.New("Update plugin " + k + " not found!")
+		}
+	}
+	return mod, nil
+}
+
 func (m Mod) Write() {
 
 }