huge refactor

- extendable backends
- better project structure
- better cli interface

monitors/template.go

@@ -0,0 +1,58 @@
+package monitors
+
+import (
+	"bytes"
+	"text/template"
+)
+
+type MonitorTemplates struct {
+	Investigating MessageTemplate
+	Fixed         MessageTemplate
+}
+
+type MessageTemplate struct {
+	Subject string `json:"subject"`
+	Message string `json:"message"`
+
+	subjectTpl *template.Template
+	messageTpl *template.Template
+}
+
+func (t *MessageTemplate) SetDefault(d MessageTemplate) {
+	if len(t.Subject) == 0 {
+		t.Subject = d.Subject
+	}
+	if len(t.Message) == 0 {
+		t.Message = d.Message
+	}
+}
+
+// TODO: test
+func (t *MessageTemplate) Compile() error {
+	var err error
+
+	if len(t.Subject) > 0 {
+		t.subjectTpl, err = compileTemplate(t.Subject)
+	}
+
+	if err == nil && len(t.Message) > 0 {
+		t.messageTpl, err = compileTemplate(t.Message)
+	}
+
+	return err
+}
+
+func (t *MessageTemplate) Exec(data interface{}) (string, string) {
+	return t.exec(t.subjectTpl, data), t.exec(t.messageTpl, data)
+}
+
+func (t *MessageTemplate) exec(tpl *template.Template, data interface{}) string {
+	buf := new(bytes.Buffer)
+
+	tpl.Execute(buf, data)
+	return buf.String()
+}
+
+func compileTemplate(text string) (*template.Template, error) {
+	return template.New("").Parse(text)
+}