Implement sending text messages

This works in a very simplistic way, but it's enough for two-way
communication. Hurrah!

README.md

@@ -34,7 +34,7 @@ Here's where we're at right now:
 - [x] Disconnect!
 - [ ] Set up an account manually
 - [ ] Contacts handling
-- [~] Text messages
+- [x] Text messages
 - [ ] Multimedia messages
 - [ ] Setup messages
 - [ ] Import/Export

src/padfoot/channel/messages.rs

@@ -1,8 +1,10 @@
-use crate::padfoot::{convert_msg, VarArg};
+use crate::padfoot::{convert_msg, DbusAction, VarArg};
 use crate::telepathy;
 
+use dbus::message::SignalArgs;
 use dbus::tree::MethodErr;
-use dc::message::MessageState;
+use dc::constants::Viewtype;
+use dc::message::{Message, MessageState};
 use deltachat as dc;
 use std::collections::HashMap;
 
@@ -15,9 +17,56 @@ impl AsRef<dyn telepathy::ChannelInterfaceMessages + 'static> for std::sync::Arc
 }
 
 impl telepathy::ChannelInterfaceMessages for Channel {
-    fn send_message(&self, message: Vec<HashMap<&str, VarArg>>, flags: u32) -> Result<String> {
-        println!("Channel::send_message({:?}, {})", message, flags);
-        Err(MethodErr::no_arg())
+    fn send_message(&self, parts: Vec<HashMap<&str, VarArg>>, flags: u32) -> Result<String> {
+        println!("Channel::send_message({:?}, {})", parts, flags);
+
+        if parts.len() != 2 {
+            return Err(MethodErr::no_arg());
+        }
+        let _meta = &parts[0];
+        let content = &parts[1];
+
+        let content_type = content["content-type"].0.as_str().unwrap();
+
+        if content_type != "text/plain" {
+            println!("FIXME: can only send text/plain messages right now");
+            return Err(MethodErr::no_arg());
+        }
+
+        let text_opt = content["content"].0.as_str().map(|s| s.to_string());
+        let mut delta_msg = Message::new(Viewtype::Text); // FIXME: this won't always be plaintext
+        delta_msg.set_text(text_opt.clone());
+
+        let ctx = self.ctx.read().unwrap();
+        let msg_id = match dc::chat::send_msg(&ctx, self.chat_id, &mut delta_msg) {
+            Ok(msg_id) => msg_id,
+            Err(e) => {
+                println!("    Failed to send message: {}", e);
+                return Err(MethodErr::no_arg());
+            }
+        };
+
+        let token = format!("{}", msg_id.to_u32());
+        let dbus_parts = convert_msg(&delta_msg);
+
+        let messages_sig = telepathy::ChannelInterfaceMessagesMessageSent {
+            content: dbus_parts,
+            flags: 0,
+            message_token: token.clone(),
+        }
+        .to_emit_message(&self.path());
+
+        let text_sig = telepathy::ChannelTypeTextSent {
+            timestamp: delta_msg.get_timestamp() as u32,
+            type_: 0,
+            text: text_opt.or_else(|| Some("".to_string())).unwrap(),
+        }
+        .to_emit_message(&self.path());
+
+        self.actq.send(DbusAction::Signal(messages_sig)).unwrap();
+        self.actq.send(DbusAction::Signal(text_sig)).unwrap();
+
+        Ok(token)
     }
 
     fn get_pending_message_content(
@@ -61,7 +110,7 @@ impl telepathy::ChannelInterfaceMessages for Channel {
             if let Ok(msg) = dc::message::Message::load_from_db(&ctx, msg_id) {
                 println!("    A message: {:?}", msg);
                 match msg.get_state() {
-                    MessageState::InFresh | MessageState::InNoticed => out.push(convert_msg(msg)),
+                    MessageState::InFresh | MessageState::InNoticed => out.push(convert_msg(&msg)),
                     _ => continue,
                 }
             }

src/padfoot/connection.rs

@@ -422,7 +422,14 @@ impl Connection {
                                 &ctx.clone().read().unwrap(),
                                 msg_id,
                             ) {
-                                let parts = convert_msg(msg);
+                                // Ignore messages that are self-originated.
+                                // FIXME: special-case self-chats
+                                if msg.get_from_id() == dc::constants::DC_CONTACT_ID_SELF {
+                                    println!("from ourselves, skipping");
+                                    continue;
+                                }
+
+                                let parts = convert_msg(&msg);
 
                                 let sig = telepathy::ChannelInterfaceMessagesMessageReceived {
                                     message: parts,
@@ -433,9 +440,8 @@ impl Connection {
 
                                 println!("OK!");
                             } else {
-                                println!("    couldn't find message not sending signal");
+                                println!("    couldn't find message, not sending signal");
                             }
-
                         // FIXME: We MUST also send a Text.Received signal
                         } else {
                             print!("Channel for {} doesn't exist yet, creating it...", chat_id);

src/padfoot/message.rs

@@ -5,7 +5,7 @@ use deltachat::message::Message;
 use std::collections::HashMap;
 
 // Turns a deltachat::message::Message into a Telepathy Message_Part_List
-pub fn convert_msg(msg: Message) -> Vec<HashMap<String, VarArg>> {
+pub fn convert_msg(msg: &Message) -> Vec<HashMap<String, VarArg>> {
     let mut parts = Vec::new();
     let mut props = HashMap::new();
     let msg_id = msg.get_id();