emoji-reaction feature

Author: sspaeti

docs/keybindings.md

@@ -113,6 +113,7 @@ Press `?` inside neomd to open the interactive help overlay. Start typing to fil
 | `R` | reload / refresh folder |
 | `r` | reply  (from inbox or reader) |
 | `ctrl+r` | reply-all — reply to sender + all CC recipients  (from inbox or reader) |
+| `ctrl+e` | react with emoji  (from inbox or reader) |
 | `f` | forward email  (from reader or inbox) |
 | `T` | show full conversation thread across folders  (from inbox or reader) |
 | `c` | compose new email |

internal/editor/editor.go

@@ -129,6 +129,19 @@ func ForwardPrelude(subject, from, originalFrom, originalDate, originalTo, origi
 	return s
 }
 
+// ReactionBody builds the plain text body for an emoji reaction.
+func ReactionBody(emoji, fromName string) string {
+	return fmt.Sprintf("%s\n\n%s reacted via neomd (https://neomd.ssp.sh)\n", emoji, fromName)
+}
+
+// ReactionBodyHTML builds the HTML body for an emoji reaction.
+func ReactionBodyHTML(emoji, fromName string) string {
+	return fmt.Sprintf(`<div style="font-size: 48px; margin: 20px 0;">%s</div>
+<p style="color: #666; font-size: 14px; margin-top: 40px; border-top: 1px solid #ddd; padding-top: 20px;">
+%s reacted via <a href="https://neomd.ssp.sh" style="color: #7E9CD8; text-decoration: none;">neomd</a>
+</p>`, emoji, fromName)
+}
+
 // ParseHeaders scans raw editor content for # [neomd: key: value] lines and
 // returns the extracted to, cc, bcc, from, subject values and the remaining body
 // (with header lines stripped). Any field not found is returned as "".

internal/imap/client.go

@@ -49,6 +49,7 @@ type Email struct {
 	HasAttachment bool   // true if BODYSTRUCTURE contains an attachment part
 	MessageID     string // Message-ID from envelope (for threading)
 	InReplyTo     string // first In-Reply-To message ID (for threading)
+	References    string // References header (space-separated Message-IDs for threading)
 }
 
 // Config holds connection parameters.
@@ -325,6 +326,8 @@ func (c *Client) FetchHeaders(ctx context.Context, folder string, n int) ([]Emai
 				if len(m.Envelope.InReplyTo) > 0 {
 					e.InReplyTo = m.Envelope.InReplyTo[0]
 				}
+				// Note: References header is fetched when the body is loaded (FetchBody)
+				// because it's not available in the IMAP Envelope structure.
 			}
 			e.Size = uint32(m.RFC822Size)
 			e.HasAttachment = hasAttachment(m.BodyStructure)

internal/smtp/sender.go

@@ -249,6 +249,12 @@ func sendSTARTTLSWithConfig(addr, host string, tlsCfg *tls.Config, auth smtp.Aut
 // otherwise the structure is unchanged (multipart/alternative only).
 // htmlSignature, if non-empty, is injected before the closing </body> tag in the HTML part.
 func BuildMessage(from, to, cc, subject, markdownBody string, attachments []string, htmlSignature string) ([]byte, error) {
+	return BuildMessageWithThreading(from, to, cc, subject, markdownBody, attachments, htmlSignature, "", "")
+}
+
+// BuildMessageWithThreading builds a MIME message with optional threading headers (In-Reply-To, References).
+// Used for replies and forwards to maintain proper email conversation threading.
+func BuildMessageWithThreading(from, to, cc, subject, markdownBody string, attachments []string, htmlSignature, inReplyTo, references string) ([]byte, error) {
 	htmlBody, err := render.ToHTML(markdownBody)
 	if err != nil {
 		return nil, fmt.Errorf("markdown to html: %w", err)
@@ -262,7 +268,16 @@ func BuildMessage(from, to, cc, subject, markdownBody string, attachments []stri
 			htmlBody = htmlBody[:idx] + "\n" + htmlSignature + "\n" + htmlBody[idx:]
 		}
 	}
-	return buildMessage(from, to, cc, subject, markdownBody, htmlBody, attachments)
+	// Build References chain: append inReplyTo to existing references
+	refChain := references
+	if inReplyTo != "" {
+		if refChain != "" {
+			refChain = refChain + " " + inReplyTo
+		} else {
+			refChain = inReplyTo
+		}
+	}
+	return buildMessageWithBCC(from, to, cc, "", subject, markdownBody, htmlBody, attachments, inReplyTo, refChain)
 }
 
 // BuildDraftMessage constructs a raw MIME draft for IMAP APPEND.
@@ -271,8 +286,27 @@ func BuildMessage(from, to, cc, subject, markdownBody string, attachments []stri
 // Drafts are stored as plain text only (no HTML conversion) to preserve the
 // original markdown formatting exactly during save/load cycles.
 func BuildDraftMessage(from, to, cc, bcc, subject, markdownBody string, attachments []string) ([]byte, error) {
-	// Pass empty htmlBody to store plain text only
-	return buildMessageWithBCC(from, to, cc, bcc, subject, markdownBody, "", attachments)
+	// Pass empty htmlBody to store plain text only; no threading headers for drafts
+	return buildMessageWithBCC(from, to, cc, bcc, subject, markdownBody, "", attachments, "", "")
+}
+
+// BuildReactionMessage constructs a minimal reaction email with threading headers.
+// Used for emoji reactions sent as replies to emails.
+// plainBody and htmlBody are pre-formatted reaction messages (emoji + footer).
+// inReplyTo is the Message-ID of the original email.
+// references is the References chain from the original email (may be empty).
+func BuildReactionMessage(from, to, cc, subject, plainBody, htmlBody, inReplyTo, references string) ([]byte, error) {
+	// Build References chain: append inReplyTo to existing references
+	refChain := references
+	if inReplyTo != "" {
+		if refChain != "" {
+			refChain = refChain + " " + inReplyTo
+		} else {
+			refChain = inReplyTo
+		}
+	}
+	// No attachments for reactions
+	return buildMessageWithBCC(from, to, cc, "", subject, plainBody, htmlBody, nil, inReplyTo, refChain)
 }
 
 // inlineImage holds a local image path and its assigned Content-ID.
@@ -291,10 +325,10 @@ type inlineImage struct {
 //   - images only          → multipart/related > (multipart/alternative + inline images)
 //   - images + files       → multipart/mixed > (multipart/related > alt+images) + files
 func buildMessage(from, to, cc, subject, plainText, htmlBody string, attachments []string) ([]byte, error) {
-	return buildMessageWithBCC(from, to, cc, "", subject, plainText, htmlBody, attachments)
+	return buildMessageWithBCC(from, to, cc, "", subject, plainText, htmlBody, attachments, "", "")
 }
 
-func buildMessageWithBCC(from, to, cc, bcc, subject, plainText, htmlBody string, attachments []string) ([]byte, error) {
+func buildMessageWithBCC(from, to, cc, bcc, subject, plainText, htmlBody string, attachments []string, inReplyTo, references string) ([]byte, error) {
 	// Find local image paths in htmlBody (<img src="/abs/path">), assign CIDs.
 	var inlines []inlineImage
 	processedHTML := imgSrcRe.ReplaceAllStringFunc(htmlBody, func(match string) string {
@@ -332,6 +366,13 @@ func buildMessageWithBCC(from, to, cc, bcc, subject, plainText, htmlBody string,
 		hdr("Subject", mime.QEncoding.Encode("utf-8", subject))
 		hdr("Date", time.Now().Format(time.RFC1123Z))
 		hdr("Message-ID", "<"+msgID+"@neomd>")
+		// Threading headers for replies
+		if inReplyTo != "" {
+			hdr("In-Reply-To", inReplyTo)
+		}
+		if references != "" {
+			hdr("References", references)
+		}
 		hdr("MIME-Version", "1.0")
 		hdr("Content-Type", contentType)
 		hdr("X-Mailer", "neomd")
@@ -356,6 +397,13 @@ func buildMessageWithBCC(from, to, cc, bcc, subject, plainText, htmlBody string,
 		hdr("Subject", mime.QEncoding.Encode("utf-8", subject))
 		hdr("Date", time.Now().Format(time.RFC1123Z))
 		hdr("Message-ID", "<"+msgID+"@neomd>")
+		// Threading headers for replies
+		if inReplyTo != "" {
+			hdr("In-Reply-To", inReplyTo)
+		}
+		if references != "" {
+			hdr("References", references)
+		}
 		hdr("MIME-Version", "1.0")
 		hdr("Content-Type", "text/plain; charset=utf-8")
 		hdr("Content-Transfer-Encoding", "quoted-printable")

internal/ui/keys.go

@@ -85,6 +85,7 @@ var HelpSections = []HelpSection{
 		{"R", "reload / refresh folder"},
 		{"r", "reply  (from inbox or reader)"},
 		{"ctrl+r", "reply-all — reply to sender + all CC recipients  (from inbox or reader)"},
+		{"ctrl+e", "react with emoji  (from inbox or reader)"},
 		{"f", "forward email  (from reader or inbox)"},
 		{"T", "show full conversation thread across folders  (from inbox or reader)"},
 		{"c", "compose new email"},