Add envelope metadata to message view

plugins/base/plugin.go

@@ -1,9 +1,6 @@
 package koushinbase
 
 import (
-	"html/template"
-	"net/url"
-
 	"git.sr.ht/~emersion/koushin"
 	"github.com/labstack/echo/v4"
 )
@@ -13,14 +10,7 @@ const messagesPerPage = 50
 func init() {
 	p := koushin.GoPlugin{Name: "base"}
 
-	p.TemplateFuncs(template.FuncMap{
-		"tuple": func(values ...interface{}) []interface{} {
-			return values
-		},
-		"pathescape": func(s string) string {
-			return url.PathEscape(s)
-		},
-	})
+	p.TemplateFuncs(templateFuncs)
 
 	p.GET("/mailbox/:mbox", handleGetMailbox)
 	p.POST("/mailbox/:mbox", handleGetMailbox)

plugins/base/public/message.html

@@ -30,6 +30,28 @@
 	<input type="submit" value="Delete">
 </form>
 
+<ul>
+	<li>
+		<strong>Date</strong>: {{.Message.Envelope.Date | formatdate}}
+	</li>
+	<li>
+		<strong>From</strong>: {{.Message.Envelope.From | formataddrlist}}
+	</li>
+	<li>
+		<strong>To</strong>: {{.Message.Envelope.To | formataddrlist}}
+	</li>
+	{{if .Message.Envelope.Cc}}
+		<li>
+			<strong>Cc</strong>: {{.Message.Envelope.Cc | formataddrlist}}
+		</li>
+	{{end}}
+	{{if .Message.Envelope.Bcc}}
+		<li>
+			<strong>Bcc</strong>: {{.Message.Envelope.Bcc | formataddrlist}}
+		</li>
+	{{end}}
+</ul>
+
 {{define "message-part-tree"}}
 	{{/* nested templates can't access the parent's context */}}
 	{{$ = index . 0}}

plugins/base/template.go

@@ -0,0 +1,29 @@
+package koushinbase
+
+import (
+	"html/template"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/emersion/go-imap"
+)
+
+var templateFuncs = template.FuncMap{
+	"tuple": func(values ...interface{}) []interface{} {
+		return values
+	},
+	"pathescape": func(s string) string {
+		return url.PathEscape(s)
+	},
+	"formataddrlist": func(addrs []*imap.Address) string {
+		l := make([]string, len(addrs))
+		for i, addr := range addrs {
+			l[i] = addr.PersonalName + " <" + addr.Address() + ">"
+		}
+		return strings.Join(l, ", ")
+	},
+	"formatdate": func(t time.Time) string {
+		return t.Format("Mon Jan 02 15:04")
+	},
+}