[addons] Creating foundation for plugin-like system "Addons" (#24)

* adding addons dir and sample addon which enables the use of a new input element in forms for referencing other content. "addons" is a conceptual plugin-like feature, similar to wordpress "plugins" dir, but not as sophisticated

1 files changed, 54 insertions, 0 deletions

diff --git a/addons/reference/reference.go b/addons/reference/reference.go
new file mode 100644
index 0000000..78e46eb
--- /dev/null
+++ b/addons/reference/reference.go
@@ -0,0 +1,54 @@
+// Package reference is a Ponzu addon to enable content editors to create
+// references to other content types which are stored as query strings within
+// the referencer's content DB
+package reference
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"log"
+
+	"github.com/bosssauce/ponzu/management/editor"
+	"github.com/bosssauce/ponzu/system/addon"
+)
+
+// Select returns the []byte of a <select> HTML element plus internal <options> with a label.
+// IMPORTANT:
+// The `fieldName` argument will cause a panic if it is not exactly the string
+// form of the struct field that this editor input is representing
+func Select(fieldName string, p interface{}, attrs map[string]string, contentType, tmplString string) []byte {
+	// decode all content type from db into options map
+	// map["?type=<contentType>&id=<id>"]t.String()
+	options := make(map[string]string)
+
+	var all map[string]interface{}
+	j := addon.ContentAll(contentType)
+
+	err := json.Unmarshal(j, &all)
+	if err != nil {
+		return nil
+	}
+
+	// make template for option html display
+	tmpl := template.Must(template.New(contentType).Parse(tmplString))
+
+	// make data something usable to iterate over and assign options
+	data := all["data"].([]interface{})
+
+	for i := range data {
+		item := data[i].(map[string]interface{})
+		k := fmt.Sprintf("?type=%s&id=%.0f", contentType, item["id"].(float64))
+		v := &bytes.Buffer{}
+		err := tmpl.Execute(v, item)
+		if err != nil {
+			log.Println("Error executing template for reference of:", contentType)
+			return nil
+		}
+
+		options[k] = v.String()
+	}
+
+	return editor.Select(fieldName, p, attrs, options)
+}