[geary: 1/2] Print common headers when printing messages

[Michael Gratton <mjog src gnome org>]

commit 2b2c587e6c48edd62080db390455ac581f962ba9
Author: Alex Henrie <alexhenrie24 gmail com>
Date:   Sat Sep 22 09:48:51 2018 -0600

    Print common headers when printing messages

 .../conversation-viewer/conversation-email.vala    |  3 --
 .../conversation-viewer/conversation-message.vala  |  7 +++++
 .../conversation-viewer/conversation-web-view.vala | 12 ++++++++
 ui/conversation-web-view.css                       |  9 ++++++
 ui/conversation-web-view.js                        | 36 ++++++++++++++++++++++
 5 files changed, 64 insertions(+), 3 deletions(-)
---
diff --git a/src/client/conversation-viewer/conversation-email.vala 
b/src/client/conversation-viewer/conversation-email.vala
index 493e462c..0bf6c121 100644
--- a/src/client/conversation-viewer/conversation-email.vala
+++ b/src/client/conversation-viewer/conversation-email.vala
@@ -805,9 +805,6 @@ public class ConversationEmail : Gtk.Box, Geary.BaseInterface {
     }
 
     private void print() {
-        // XXX This isn't anywhere near good enough - headers aren't
-        // being printed.
-
         Gtk.Window? window = get_toplevel() as Gtk.Window;
         WebKit.PrintOperation op = new WebKit.PrintOperation(
             this.primary_message.web_view
diff --git a/src/client/conversation-viewer/conversation-message.vala 
b/src/client/conversation-viewer/conversation-message.vala
index dfbce2ce..6c68c7c4 100644
--- a/src/client/conversation-viewer/conversation-message.vala
+++ b/src/client/conversation-viewer/conversation-message.vala
@@ -482,6 +482,13 @@ public class ConversationMessage : Gtk.Grid, Geary.BaseInterface {
         }
 
         load_cancelled.cancelled.connect(() => { web_view.stop_loading(); });
+        this.web_view.set_print_headers(
+            this.message.from != null ? this.message.from.to_string() : null,
+            this.message.to != null ? this.message.to.to_string() : null,
+            this.message.cc != null ? this.message.cc.to_string() : null,
+            this.message.bcc != null ? this.message.bcc.to_string() : null,
+            this.message.date != null ? this.message.date.to_string() : null,
+            this.message.subject != null ? this.message.subject.to_string() : null);
         this.web_view.load_html(body_text ?? "");
     }
 
diff --git a/src/client/conversation-viewer/conversation-web-view.vala 
b/src/client/conversation-viewer/conversation-web-view.vala
index 217d0a64..62323b2a 100644
--- a/src/client/conversation-viewer/conversation-web-view.vala
+++ b/src/client/conversation-viewer/conversation-web-view.vala
@@ -54,6 +54,18 @@ public class ConversationWebView : ClientWebView {
         );
     }
 
+    public void set_print_headers(string? from, string? to, string? cc, string? bcc, string? date, string? 
subject) {
+        StringBuilder js = new StringBuilder("var gearyEmailHeaders = {");
+        if (from != null) js.append(_("'From:':'") + from.replace("'", "\\'") + "',");
+        if (to != null) js.append(_("'To:':'") + to.replace("'", "\\'") + "',");
+        if (cc != null) js.append(_("'CC:':'") + cc.replace("'", "\\'") + "',");
+        if (bcc != null) js.append(_("'BCC:':'") + bcc.replace("'", "\\'") + "',");
+        if (date != null) js.append(_("'Date:':'") + date.replace("'", "\\'") + "',");
+        if (subject != null) js.append(_("'Subject:':'") + subject.replace("'", "\\'") + "',");
+        js.append("};");
+        this.run_javascript(js.str, null);
+    }
+
 
     /** Emitted when the user clicks on a link with deceptive text. */
     public signal void deceptive_link_clicked(
diff --git a/ui/conversation-web-view.css b/ui/conversation-web-view.css
index 0040bca3..70de0047 100644
--- a/ui/conversation-web-view.css
+++ b/ui/conversation-web-view.css
@@ -193,8 +193,17 @@ pre {
   }
 }
 
+#geary-message-headers {
+  display: none;
+}
+
 @media print {
   .geary-button {
     display: none;
   }
+
+  #geary-message-headers {
+    all: initial;
+    display: block;
+  }
 }
diff --git a/ui/conversation-web-view.js b/ui/conversation-web-view.js
index b24beb33..6b9dc262 100644
--- a/ui/conversation-web-view.js
+++ b/ui/conversation-web-view.js
@@ -314,3 +314,39 @@ ConversationPageState.isDescendantOf = function(node, ancestorTag) {
 };
 
 var geary = new ConversationPageState();
+
+/**
+ * Add email headers for printing
+ */
+
+document.addEventListener('DOMContentLoaded', () => {
+    let headerBlock = document.createElement('div');
+    headerBlock.id = 'geary-message-headers';
+
+    let shadowRoot = headerBlock.attachShadow({mode: 'closed'});
+
+    let shadowStyle = document.createElement('style');
+    shadowStyle.textContent = "\
+        table, tr, th, td, hr { all:initial; }\
+        table { display:table; }\
+        tr { display:table-row; }\
+        td, th { display:table-cell; line-height:1.5em; }\
+        th { font-weight:bold; padding-right:2ex; }\
+        hr { display:block; border-style:inset; border-width:1px; margin-top:0.5em; margin-bottom:0.5em; }";
+    shadowRoot.appendChild(shadowStyle);
+
+    let headerTable = document.createElement('table');
+    shadowRoot.appendChild(headerTable);
+
+    for (header in gearyEmailHeaders) {
+        let row = headerTable.appendChild(document.createElement('tr'));
+        let name = row.appendChild(document.createElement('th'));
+        let value = row.appendChild(document.createElement('td'));
+        name.textContent = header;
+        value.textContent = gearyEmailHeaders[header];
+    }
+
+    shadowRoot.appendChild(document.createElement('hr'));
+
+    document.body.insertBefore(headerBlock, document.body.firstChild);
+});