Set file extensions to temp files, use `open` in macos

If html_filter fails, meli unwraps it. Also, if it can't find an xdg default app it also fails.

So use xdg-open and open as failsaifes.

But that requires `open` to know it's an html file, so implemented setting temp file extensions as well.

src/components/mail/compose.rs

@@ -1774,6 +1774,7 @@ impl Component for Composer {
                     self.draft.to_edit_string().as_str().as_bytes(),
                     None,
                     None,
+                    Some("eml"),
                     true,
                 );
 
@@ -1867,7 +1868,7 @@ impl Component for Composer {
                         ));
                         return false;
                     }
-                    let f = create_temp_file(&[], None, None, true);
+                    let f = create_temp_file(&[], None, None, None, true);
                     match Command::new("sh")
                         .args(["-c", command])
                         .stdin(Stdio::null())
@@ -2409,7 +2410,7 @@ pub fn send_draft_async(
                 ))))
                 .unwrap();
         } else if !store_sent_mail && is_ok {
-            let f = create_temp_file(message.as_bytes(), None, None, false);
+            let f = create_temp_file(message.as_bytes(), None, None, Some("eml"), false);
             log::info!(
                 "store_sent_mail is false; stored sent mail to {}",
                 f.path().display()

src/components/mail/view.rs

@@ -796,7 +796,11 @@ impl MailView {
                     .args(["-c", filter_invocation])
                     .stdin(Stdio::piped())
                     .stdout(Stdio::piped())
-                    .spawn();
+                    .spawn()
+                    .and_then(|mut cmd| {
+                        cmd.stdin.as_mut().unwrap().write_all(&bytes)?;
+                        Ok(String::from_utf8_lossy(&cmd.wait_with_output()?.stdout).to_string())
+                    });
                 match command_obj {
                     Err(err) => {
                         context.replies.push_back(UIEvent::Notification(
@@ -819,21 +823,11 @@ impl MailView {
                             text,
                         });
                     }
-                    Ok(mut html_filter) => {
-                        html_filter
-                            .stdin
-                            .as_mut()
-                            .unwrap()
-                            .write_all(&bytes)
-                            .expect("Failed to write to stdin");
+                    Ok(text) => {
                         let comment = Some(format!(
                             "Text piped through `{}`. Press `v` to open in web browser. \n\n",
                             filter_invocation
                         ));
-                        let text = String::from_utf8_lossy(
-                            &html_filter.wait_with_output().unwrap().stdout,
-                        )
-                        .to_string();
                         acc.push(AttachmentDisplay::InlineText {
                             inner: Box::new(a.clone()),
                             comment,
@@ -2306,6 +2300,7 @@ impl Component for MailView {
                                             &attachment.decode(Default::default()),
                                             filename.as_deref(),
                                             None,
+                                            None,
                                             true,
                                         );
                                         let exec_cmd = desktop_exec_to_command(

src/components/mail/view/envelope.rs

@@ -443,6 +443,7 @@ impl Component for EnvelopeView {
                                     &u.decode(Default::default()),
                                     filename.as_deref(),
                                     None,
+                                    None,
                                     true,
                                 );
                                 let exec_cmd = super::desktop_exec_to_command(

src/components/mail/view/html.rs

@@ -152,8 +152,15 @@ impl Component for HtmlView {
             } else {
                 query_default_app("text/html").ok()
             };
+            let command = if cfg!(target_os = "macos") {
+                command.or_else(|| Some("open".into()))
+            } else if cfg!(target_os = "linux") {
+                command.or_else(|| Some("xdg-open".into()))
+            } else {
+                command
+            };
             if let Some(command) = command {
-                let p = create_temp_file(&self.bytes, None, None, true);
+                let p = create_temp_file(&self.bytes, None, None, Some("html"), true);
                 let exec_cmd =
                     super::desktop_exec_to_command(&command, p.path.display().to_string(), false);
                 match Command::new("sh")

src/conf/accounts.rs

@@ -1231,7 +1231,7 @@ impl Account {
         if let Some(mailbox_hash) = saved_at {
             Ok(mailbox_hash)
         } else {
-            let file = crate::types::create_temp_file(bytes, None, None, false);
+            let file = crate::types::create_temp_file(bytes, None, None, Some("eml"), false);
             debug!("message saved in {}", file.path.display());
             log::info!(
                 "Message was stored in {} so that you can restore it manually.",
@@ -1873,7 +1873,8 @@ impl Account {
                 } => {
                     if let Ok(Some(Err(err))) = handle.chan.try_recv() {
                         log::error!("Could not save message: {err}");
-                        let file = crate::types::create_temp_file(bytes, None, None, false);
+                        let file =
+                            crate::types::create_temp_file(bytes, None, None, Some("eml"), false);
                         log::debug!("message saved in {}", file.path.display());
                         log::info!(
                             "Message was stored in {} so that you can restore it manually.",

src/mailcap.rs

@@ -165,8 +165,13 @@ impl MailcapEntry {
                     .map(|arg| match *arg {
                         "%s" => {
                             needs_stdin = false;
-                            let _f =
-                                create_temp_file(&a.decode(Default::default()), None, None, true);
+                            let _f = create_temp_file(
+                                &a.decode(Default::default()),
+                                None,
+                                None,
+                                None,
+                                true,
+                            );
                             let p = _f.path().display().to_string();
                             f = Some(_f);
                             p

src/types/helpers.rs

@@ -72,7 +72,8 @@ impl File {
 pub fn create_temp_file(
     bytes: &[u8],
     filename: Option<&str>,
-    path: Option<&PathBuf>,
+    path: Option<&mut PathBuf>,
+    extension: Option<&str>,
     delete_on_drop: bool,
 ) -> File {
     let mut dir = std::env::temp_dir();
@@ -89,10 +90,13 @@ pub fn create_temp_file(
             let u = Uuid::new_v4();
             dir.push(u.as_hyphenated().to_string());
         }
-        &dir
+        &mut dir
     });
+    if let Some(ext) = extension {
+        path.set_extension(ext);
+    }
 
-    let mut f = std::fs::File::create(path).unwrap();
+    let mut f = std::fs::File::create(&path).unwrap();
     let metadata = f.metadata().unwrap();
     let mut permissions = metadata.permissions();