Setup plugin ids and dependencies

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

plugin/context.go

@@ -0,0 +1,36 @@
+package plugin
+
+import (
+	"context"
+	"fmt"
+)
+
+func NewContext(plugins map[PluginType][]interface{}) *InitContext {
+	return &InitContext{
+		plugins: plugins,
+	}
+}
+
+type InitContext struct {
+	Root    string
+	Context context.Context
+	Config  interface{}
+
+	plugins map[PluginType][]interface{}
+}
+
+func (i *InitContext) Get(t PluginType) (interface{}, error) {
+	p := i.plugins[t]
+	if len(p) == 0 {
+		return nil, fmt.Errorf("no plugins registered for %s", t)
+	}
+	return p[0], nil
+}
+
+func (i *InitContext) GetAll(t PluginType) ([]interface{}, error) {
+	p, ok := i.plugins[t]
+	if !ok {
+		return nil, fmt.Errorf("no plugins registered for %s", t)
+	}
+	return p, nil
+}