helix-mods/tudbut_mod_1.patch

diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index 7be2ea09..3dacb5c8 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -3778,6 +3778,10 @@ pub fn insert_char(cx: &mut Context, c: char) {
             doc.apply(&t, view.id);
         }
 
+        // -- TudbuT mod begin
+        helix_view::tt__update_manpage(doc, view.id);
+        // -- TudbuT mod end
+
         helix_event::dispatch(PostInsertChar { c, cx });
     }
 
diff --git a/helix-view/src/document.rs b/helix-view/src/document.rs
index 23b597a3..5b4fdc4d 100644
--- a/helix-view/src/document.rs
+++ b/helix-view/src/document.rs
@@ -1144,6 +1144,9 @@ pub fn set_selection(&mut self, view_id: ViewId, selection: Selection) {
         // TODO: use a transaction?
         self.selections
             .insert(view_id, selection.ensure_invariants(self.text().slice(..)));
+        // -- TudbuT mod begin
+        crate::tt__update_manpage(self, view_id);
+        // -- TudbuT mod end
         helix_event::dispatch(SelectionDidChange {
             doc: self,
             view: view_id,
@@ -1225,6 +1228,9 @@ fn apply_impl(
                     view_id,
                     selection.clone().ensure_invariants(self.text.slice(..)),
                 );
+                // -- TudbuT mod begin
+                crate::tt__update_manpage(self, view_id);
+                // -- TudbuT mod end
                 helix_event::dispatch(SelectionDidChange {
                     doc: self,
                     view: view_id,
diff --git a/helix-view/src/lib.rs b/helix-view/src/lib.rs
index 14b6e1ce..79541244 100644
--- a/helix-view/src/lib.rs
+++ b/helix-view/src/lib.rs
@@ -75,3 +75,148 @@ pub fn align_view(doc: &Document, view: &mut View, align: Align) {
 use helix_core::char_idx_at_visual_offset;
 pub use theme::Theme;
 pub use view::View;
+
+// -- TudbuT mod begin
+
+/// communicates with the outside world
+#[allow(non_camel_case_types)]
+struct TT__Server {
+    tcp_listener: std::net::TcpListener,
+    tcp_streams: Vec<std::net::TcpStream>,
+    last_word: String,
+}
+
+impl TT__Server {
+    fn new() -> Self {
+        // god damn
+        #[derive(Clone)]
+        struct AddrIter<T: Iterator<Item = u16> + Clone> {
+            inner: T,
+        }
+        impl<T: Iterator<Item = u16> + Clone> AddrIter<T> {
+            pub fn new(inner: T) -> Self {
+                Self { inner }
+            }
+        }
+        impl<T: Iterator<Item = u16> + Clone> Iterator for AddrIter<T> {
+            type Item = std::net::SocketAddr;
+
+            fn next(&mut self) -> Option<Self::Item> {
+                Some(std::net::SocketAddr::V4(std::net::SocketAddrV4::new(
+                    std::net::Ipv4Addr::new(127, 0, 0, 1),
+                    self.inner.next()?,
+                )))
+            }
+        }
+        impl<T: Iterator<Item = u16> + Clone> std::net::ToSocketAddrs for AddrIter<T> {
+            type Iter = Self;
+
+            fn to_socket_addrs(&self) -> std::io::Result<Self::Iter> {
+                Ok(self.clone())
+            }
+        }
+
+        let me = Self {
+            tcp_listener: std::net::TcpListener::bind(AddrIter::new(7400..)).expect("DO NOT REPORT THIS TO HELIX!!! This is a TudbuT mod error: unable to start TT__Server"),
+            tcp_streams: Vec::new(),
+            last_word: String::default(),
+        };
+
+        me.tcp_listener.set_nonblocking(true).expect(
+            "DO NOT REPORT THIS TO HELIX!!! This is a TudbuT mod error: unable to set nonblocking",
+        );
+
+        me
+    }
+
+    fn update(&mut self, mut new_word: String) {
+        use std::io::{ErrorKind, Read, Write};
+
+        if let Ok((x, _)) = self.tcp_listener.accept() {
+            if x.set_nonblocking(true).is_ok() {
+                self.tcp_streams.push(x);
+            }
+        }
+        new_word += "\n";
+        if self.last_word != new_word {
+            let b = new_word.as_bytes().len();
+            let mut buf = [0u8; 1024];
+            let mut to_remove = Vec::new();
+            for (i, stream) in self.tcp_streams.iter_mut().enumerate() {
+                match stream.read(&mut buf) {
+                    Ok(_n @ 1..) => (),
+                    Err(e) if e.kind() == ErrorKind::WouldBlock => (),
+                    _ => {
+                        to_remove.push(i);
+                        continue;
+                    }
+                }
+                match stream.write(new_word.as_bytes()) {
+                    Ok(n) if n == b => (),
+                    _ => to_remove.push(i),
+                }
+            }
+            for i in to_remove {
+                let stream = self.tcp_streams.remove(i);
+                let _ = stream.shutdown(std::net::Shutdown::Both);
+            }
+
+            self.last_word = new_word;
+        }
+    }
+}
+
+#[allow(non_upper_case_globals)]
+static TT__SERVER: std::sync::Mutex<Option<TT__Server>> = std::sync::Mutex::new(None);
+
+#[allow(non_snake_case)]
+pub fn tt__update_manpage(doc: &Document, view_id: ViewId) {
+    let c = helix_core::syntax::FileType::Extension("c".to_owned());
+
+    fn get_word(text: &str, idx: usize) -> &str {
+        let mut start = idx;
+        let mut end = idx;
+
+        const WORD_END: &str = " {}()[],#+-/*;<>&!\"'%$?~^|'\n\r";
+
+        while start != 0 && !WORD_END.contains(&&text[start - 1..start]) {
+            start = match start.checked_sub(1) {
+                Some(n) => n,
+                None => break,
+            }
+        }
+
+        while end != text.len() && !WORD_END.contains(&&text[end..=end]) {
+            end += 1;
+        }
+
+        &text[start..end]
+    }
+
+    if doc
+        .language
+        .as_ref()
+        .is_some_and(|x| x.file_types.contains(&c))
+    {
+        let idx = doc.selection(view_id).primary().to() - 1;
+        let lidx = doc.text().char_to_line(idx);
+        let line_idx = doc.text().line_to_char(lidx);
+        let next_line_idx = doc.text().line_to_char(lidx + 1);
+        let idx_in_line = idx - line_idx;
+
+        let text_in_line = doc.text().slice(line_idx..next_line_idx).to_string();
+
+        let word = get_word(&text_in_line, idx_in_line);
+
+        let mut server = TT__SERVER
+            .lock()
+            .expect("DO NOT REPORT THIS TO HELIX (mod error)");
+        if let Some(ref mut server) = *server {
+            server.update(word.to_owned());
+        } else {
+            *server = Some(TT__Server::new());
+        }
+    }
+}
+
+// -- TudbuT mod end