mx-sanebot: add command that can show torrent status

pkgs/mx-sanebot/src/msg_handler.rs

@@ -1,4 +1,7 @@
+use std::borrow::ToOwned;
 use std::fmt;
+use std::process;
+use std::str;
 
 pub struct MessageHandler;
 
@@ -14,10 +17,10 @@ impl MessageHandler {
 
     fn parse_msg(&self, msg: &str) -> Result<Request, ()> {
         let msg = msg.trim();
-        if msg == "!help" {
+        match msg {
-            Ok(Request::Help)
+            "!help" => Ok(Request::Help),
-        } else {
+            "!bt" => Ok(Request::Bt),
-            Err(())
+            _ => Err(())
         }
     }
 }
@@ -25,24 +28,41 @@ impl MessageHandler {
 
 enum Request {
     Help,
+    Bt,
 }
 
 impl Request {
     fn evaluate(self) -> Response {
         match self {
-            Request::Help => Response::About,
+            Request::Help => Response::Help,
+            Request::Bt => Response::Bt(
+                process::Command::new("sane-bt-show")
+                    .output()
+                    .ok()
+                    .and_then(|output|
+                        str::from_utf8(&output.stdout).ok().map(ToOwned::to_owned)
+                    ).unwrap_or_else(||
+                        "failed to retrieve torrent status".to_owned())
+            ),
         }
     }
 }
 
 enum Response {
-    About,
+    Help,
+    Bt(String),
 }
 
 impl fmt::Display for Response {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "commands:\n")?;
+        match self {
-        write!(f, "  !help => show this message\n")?;
+            Response::Help => {
+                write!(f, "commands:\n")?;
+                write!(f, "  !help => show this message\n")?;
+                write!(f, "  !bt => show torrent statuses\n")?;
+            },
+            Response::Bt(stdout) => write!(f, "{}", stdout)?
+        }
         Ok(())
     }
 }