notmuch & server: plumb Delivered-To and X-Original-To headers

server/src/graphql.rs

@@ -95,6 +95,10 @@ pub struct Message {
     pub to: Vec<Email>,
     // All CC headers found in email
     pub cc: Vec<Email>,
+    // X-Original-To header found in email
+    pub x_original_to: Option<Email>,
+    // Delivered-To header found in email
+    pub delivered_to: Option<Email>,
     // First Subject header found in email
     pub subject: Option<String>,
     // Parsed Date header, if found and valid

server/src/lib.rs

@@ -773,7 +773,19 @@ impl Query {
         for uid in &self.uids {
             parts.push(uid.clone());
         }
-        parts.extend(self.remainder.clone());
+        for r in &self.remainder {
+            // Rewrite "to:" to include ExtraTo:. ExtraTo: is configured in
+            // notmuch-config to index Delivered-To and X-Original-To headers.
+            if r.starts_with("to:") {
+                parts.push("(".to_string());
+                parts.push(r.to_string());
+                parts.push("OR".to_string());
+                parts.push(r.replace("to:", "ExtraTo:"));
+                parts.push(")".to_string());
+            } else {
+                parts.push(r.to_string());
+            }
+        }
         parts.join(" ")
     }
 }

server/src/nm.rs

@@ -196,6 +196,8 @@ pub async fn thread(
 
         let to = email_addresses(&path, &m, "to")?;
         let cc = email_addresses(&path, &m, "cc")?;
+        let delivered_to = email_addresses(&path, &m, "delivered-to")?.pop();
+        let x_original_to = email_addresses(&path, &m, "x-original-to")?.pop();
         let subject = m.headers.get_first_value("subject");
         let timestamp = m
             .headers
@@ -315,6 +317,8 @@ pub async fn thread(
             body,
             path,
             attachments,
+            delivered_to,
+            x_original_to,
         });
     }
     messages.reverse();