Split off dap event handlers into helix-view to allow reuse

3 files changed, 339 insertions, 0 deletions

diff --git a/helix-view/src/handlers/dap.rs b/helix-view/src/handlers/dap.rs
new file mode 100644
index 00000000..c69d290d
--- /dev/null
+++ b/helix-view/src/handlers/dap.rs
@@ -0,0 +1,311 @@
+use crate::editor::{Action, Breakpoint};
+use crate::{align_view, Align, Editor};
+use helix_core::Selection;
+use helix_dap::{self as dap, Client, Payload, Request, ThreadId};
+use helix_lsp::block_on;
+use log::warn;
+use std::path::PathBuf;
+
+#[macro_export]
+macro_rules! debugger {
+    ($editor:expr) => {{
+        match &mut $editor.debugger {
+            Some(debugger) => debugger,
+            None => return,
+        }
+    }};
+}
+
+// general utils:
+pub fn dap_pos_to_pos(doc: &helix_core::Rope, line: usize, column: usize) -> Option<usize> {
+    // 1-indexing to 0 indexing
+    let line = doc.try_line_to_char(line - 1).ok()?;
+    let pos = line + column.saturating_sub(1);
+    // TODO: this is probably utf-16 offsets
+    Some(pos)
+}
+
+pub async fn select_thread_id(editor: &mut Editor, thread_id: ThreadId, force: bool) {
+    let debugger = debugger!(editor);
+
+    if !force && debugger.thread_id.is_some() {
+        return;
+    }
+
+    debugger.thread_id = Some(thread_id);
+    fetch_stack_trace(debugger, thread_id).await;
+
+    let frame = debugger.stack_frames[&thread_id].get(0).cloned();
+    if let Some(frame) = &frame {
+        jump_to_stack_frame(editor, frame);
+    }
+}
+
+pub async fn fetch_stack_trace(debugger: &mut Client, thread_id: ThreadId) {
+    let (frames, _) = match debugger.stack_trace(thread_id).await {
+        Ok(frames) => frames,
+        Err(_) => return,
+    };
+    debugger.stack_frames.insert(thread_id, frames);
+    debugger.active_frame = Some(0);
+}
+
+pub fn jump_to_stack_frame(editor: &mut Editor, frame: &helix_dap::StackFrame) {
+    let path = if let Some(helix_dap::Source {
+        path: Some(ref path),
+        ..
+    }) = frame.source
+    {
+        path.clone()
+    } else {
+        return;
+    };
+
+    if let Err(e) = editor.open(path, Action::Replace) {
+        editor.set_error(format!("Unable to jump to stack frame: {}", e));
+        return;
+    }
+
+    let (view, doc) = current!(editor);
+
+    let text_end = doc.text().len_chars().saturating_sub(1);
+    let start = dap_pos_to_pos(doc.text(), frame.line, frame.column).unwrap_or(0);
+    let end = frame
+        .end_line
+        .and_then(|end_line| dap_pos_to_pos(doc.text(), end_line, frame.end_column.unwrap_or(0)))
+        .unwrap_or(start);
+
+    let selection = Selection::single(start.min(text_end), end.min(text_end));
+    doc.set_selection(view.id, selection);
+    align_view(doc, view, Align::Center);
+}
+
+pub fn breakpoints_changed(
+    debugger: &mut dap::Client,
+    path: PathBuf,
+    breakpoints: &mut [Breakpoint],
+) -> Result<(), anyhow::Error> {
+    // TODO: handle capabilities correctly again, by filterin breakpoints when emitting
+    // if breakpoint.condition.is_some()
+    //     && !debugger
+    //         .caps
+    //         .as_ref()
+    //         .unwrap()
+    //         .supports_conditional_breakpoints
+    //         .unwrap_or_default()
+    // {
+    //     bail!(
+    //         "Can't edit breakpoint: debugger does not support conditional breakpoints"
+    //     )
+    // }
+    // if breakpoint.log_message.is_some()
+    //     && !debugger
+    //         .caps
+    //         .as_ref()
+    //         .unwrap()
+    //         .supports_log_points
+    //         .unwrap_or_default()
+    // {
+    //     bail!("Can't edit breakpoint: debugger does not support logpoints")
+    // }
+    let source_breakpoints = breakpoints
+        .iter()
+        .map(|breakpoint| helix_dap::SourceBreakpoint {
+            line: breakpoint.line + 1, // convert from 0-indexing to 1-indexing (TODO: could set debugger to 0-indexing on init)
+            ..Default::default()
+        })
+        .collect::<Vec<_>>();
+
+    let request = debugger.set_breakpoints(path, source_breakpoints);
+    match block_on(request) {
+        Ok(Some(dap_breakpoints)) => {
+            for (breakpoint, dap_breakpoint) in breakpoints.iter_mut().zip(dap_breakpoints) {
+                breakpoint.id = dap_breakpoint.id;
+                breakpoint.verified = dap_breakpoint.verified;
+                breakpoint.message = dap_breakpoint.message;
+                // TODO: handle breakpoint.message
+                // TODO: verify source matches
+                breakpoint.line = dap_breakpoint.line.unwrap_or(0).saturating_sub(1); // convert to 0-indexing
+                                                                                      // TODO: no unwrap
+                breakpoint.column = dap_breakpoint.column;
+                // TODO: verify end_linef/col instruction reference, offset
+            }
+        }
+        Err(e) => anyhow::bail!("Failed to set breakpoints: {}", e),
+        _ => {}
+    };
+    Ok(())
+}
+
+impl Editor {
+    pub async fn handle_debugger_message(&mut self, payload: helix_dap::Payload) -> bool {
+        use dap::requests::RunInTerminal;
+        use helix_dap::{events, Event};
+
+        let debugger = match self.debugger.as_mut() {
+            Some(debugger) => debugger,
+            None => return false,
+        };
+        match payload {
+            Payload::Event(ev) => match *ev {
+                Event::Stopped(events::Stopped {
+                    thread_id,
+                    description,
+                    text,
+                    reason,
+                    all_threads_stopped,
+                    ..
+                }) => {
+                    let all_threads_stopped = all_threads_stopped.unwrap_or_default();
+
+                    if all_threads_stopped {
+                        if let Ok(response) = debugger.request::<dap::requests::Threads>(()).await {
+                            for thread in response.threads {
+                                fetch_stack_trace(debugger, thread.id).await;
+                            }
+                            select_thread_id(self, thread_id.unwrap_or_default(), false).await;
+                        }
+                    } else if let Some(thread_id) = thread_id {
+                        debugger.thread_states.insert(thread_id, reason.clone()); // TODO: dap uses "type" || "reason" here
+
+                        // whichever thread stops is made "current" (if no previously selected thread).
+                        select_thread_id(self, thread_id, false).await;
+                    }
+
+                    let scope = match thread_id {
+                        Some(id) => format!("Thread {}", id),
+                        None => "Target".to_owned(),
+                    };
+
+                    let mut status = format!("{} stopped because of {}", scope, reason);
+                    if let Some(desc) = description {
+                        status.push_str(&format!(" {}", desc));
+                    }
+                    if let Some(text) = text {
+                        status.push_str(&format!(" {}", text));
+                    }
+                    if all_threads_stopped {
+                        status.push_str(" (all threads stopped)");
+                    }
+
+                    self.set_status(status);
+                }
+                Event::Continued(events::Continued { thread_id, .. }) => {
+                    debugger
+                        .thread_states
+                        .insert(thread_id, "running".to_owned());
+                    if debugger.thread_id == Some(thread_id) {
+                        debugger.resume_application();
+                    }
+                }
+                Event::Thread(_) => {
+                    // TODO: update thread_states, make threads request
+                }
+                Event::Breakpoint(events::Breakpoint { reason, breakpoint }) => {
+                    match &reason[..] {
+                        "new" => {
+                            if let Some(source) = breakpoint.source {
+                                self.breakpoints
+                                    .entry(source.path.unwrap()) // TODO: no unwraps
+                                    .or_default()
+                                    .push(Breakpoint {
+                                        id: breakpoint.id,
+                                        verified: breakpoint.verified,
+                                        message: breakpoint.message,
+                                        line: breakpoint.line.unwrap().saturating_sub(1), // TODO: no unwrap
+                                        column: breakpoint.column,
+                                        ..Default::default()
+                                    });
+                            }
+                        }
+                        "changed" => {
+                            for breakpoints in self.breakpoints.values_mut() {
+                                if let Some(i) =
+                                    breakpoints.iter().position(|b| b.id == breakpoint.id)
+                                {
+                                    breakpoints[i].verified = breakpoint.verified;
+                                    breakpoints[i].message = breakpoint.message.clone();
+                                    breakpoints[i].line =
+                                        breakpoint.line.unwrap().saturating_sub(1); // TODO: no unwrap
+                                    breakpoints[i].column = breakpoint.column;
+                                }
+                            }
+                        }
+                        "removed" => {
+                            for breakpoints in self.breakpoints.values_mut() {
+                                if let Some(i) =
+                                    breakpoints.iter().position(|b| b.id == breakpoint.id)
+                                {
+                                    breakpoints.remove(i);
+                                }
+                            }
+                        }
+                        reason => {
+                            warn!("Unknown breakpoint event: {}", reason);
+                        }
+                    }
+                }
+                Event::Output(events::Output {
+                    category, output, ..
+                }) => {
+                    let prefix = match category {
+                        Some(category) => {
+                            if &category == "telemetry" {
+                                return false;
+                            }
+                            format!("Debug ({}):", category)
+                        }
+                        None => "Debug:".to_owned(),
+                    };
+
+                    log::info!("{}", output);
+                    self.set_status(format!("{} {}", prefix, output));
+                }
+                Event::Initialized => {
+                    // send existing breakpoints
+                    for (path, breakpoints) in &mut self.breakpoints {
+                        // TODO: call futures in parallel, await all
+                        let _ = breakpoints_changed(debugger, path.clone(), breakpoints);
+                    }
+                    // TODO: fetch breakpoints (in case we're attaching)
+
+                    if debugger.configuration_done().await.is_ok() {
+                        self.set_status("Debugged application started");
+                    }; // TODO: do we need to handle error?
+                }
+                ev => {
+                    log::warn!("Unhandled event {:?}", ev);
+                    return false; // return early to skip render
+                }
+            },
+            Payload::Response(_) => unreachable!(),
+            Payload::Request(request) => match request.command.as_str() {
+                RunInTerminal::COMMAND => {
+                    let arguments: dap::requests::RunInTerminalArguments =
+                        serde_json::from_value(request.arguments.unwrap_or_default()).unwrap();
+                    // TODO: no unwrap
+
+                    let process = std::process::Command::new("tmux")
+                        .arg("split-window")
+                        .arg(arguments.args.join(" "))
+                        .spawn()
+                        .unwrap();
+
+                    let _ = debugger
+                        .reply(
+                            request.seq,
+                            dap::requests::RunInTerminal::COMMAND,
+                            serde_json::to_value(dap::requests::RunInTerminalResponse {
+                                process_id: Some(process.id()),
+                                shell_process_id: None,
+                            })
+                            .map_err(|e| e.into()),
+                        )
+                        .await;
+                }
+                _ => log::error!("DAP reverse request not implemented: {:?}", request),
+            },
+        }
+        true
+    }
+}
diff --git a/helix-view/src/handlers/lsp.rs b/helix-view/src/handlers/lsp.rs
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/helix-view/src/handlers/lsp.rs
diff --git a/helix-view/src/lib.rs b/helix-view/src/lib.rs
index e0964e1c..788304bc 100644
--- a/helix-view/src/lib.rs
+++ b/helix-view/src/lib.rs
@@ -6,6 +6,10 @@ pub mod document;
 pub mod editor;
 pub mod graphics;
 pub mod gutter;
+pub mod handlers {
+    pub mod dap;
+    pub mod lsp;
+}
 pub mod info;
 pub mod input;
 pub mod keyboard;
@@ -36,6 +40,30 @@ slotmap::new_key_type! {
     pub struct ViewId;
 }
 
+pub enum Align {
+    Top,
+    Center,
+    Bottom,
+}
+
+pub fn align_view(doc: &Document, view: &mut View, align: Align) {
+    let pos = doc
+        .selection(view.id)
+        .primary()
+        .cursor(doc.text().slice(..));
+    let line = doc.text().char_to_line(pos);
+
+    let height = view.inner_area().height as usize;
+
+    let relative = match align {
+        Align::Center => height / 2,
+        Align::Top => 0,
+        Align::Bottom => height,
+    };
+
+    view.offset.row = line.saturating_sub(relative);
+}
+
 pub use document::Document;
 pub use editor::Editor;
 pub use theme::Theme;