3 files changed, 100 insertions, 1 deletions

diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index 62200d76..5eb51965 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -304,6 +304,7 @@ impl Command {
         surround_delete, "Surround delete",
         select_textobject_around, "Select around object",
         select_textobject_inner, "Select inside object",
+        dap_launch, "Launch debug target",
         dap_toggle_breakpoint, "Toggle breakpoint",
         dap_run, "Begin program execution",
         dap_continue, "Continue program execution",
@@ -4491,7 +4492,7 @@ fn suspend(_cx: &mut Context) {
 }
 
 // DAP
-fn dap_start_impl(
+pub fn dap_start_impl(
     editor: &mut Editor,
     name: Option<&str>,
     socket: Option<std::net::SocketAddr>,
@@ -4596,6 +4597,41 @@ fn dap_start_impl(
     editor.debugger_events.push(stream);
 }
 
+fn dap_launch(cx: &mut Context) {
+    if cx.editor.debugger.is_some() {
+        cx.editor
+            .set_error("Can't start debug: debugger is running".to_string());
+        return;
+    }
+
+    let (_, doc) = current!(cx.editor);
+    let path = match doc.path() {
+        Some(path) => path.to_path_buf(),
+        None => {
+            cx.editor
+                .set_error("Can't start debug: document has no path".to_string());
+            return;
+        }
+    };
+
+    let config = cx
+        .editor
+        .syn_loader
+        .language_config_for_file_name(&path)
+        .and_then(|x| x.debugger.clone());
+    let config = match config {
+        Some(c) => c,
+        None => {
+            cx.editor.set_error(
+                "Can't start debug: no debug adapter available for language".to_string(),
+            );
+            return;
+        }
+    };
+
+    cx.editor.debug_config_picker = Some(config.templates.iter().map(|t| t.name.clone()).collect());
+}
+
 fn dap_toggle_breakpoint(cx: &mut Context) {
     use helix_lsp::block_on;
 
diff --git a/helix-term/src/keymap.rs b/helix-term/src/keymap.rs
index 02b5f25c..d16c9a3a 100644
--- a/helix-term/src/keymap.rs
+++ b/helix-term/src/keymap.rs
@@ -486,6 +486,7 @@ impl Default for Keymaps {
                 "a" => code_action,
                 "'" => last_picker,
                 "d" => { "Debug"
+                    "s" => dap_launch,
                     "b" => dap_toggle_breakpoint,
                     "r" => dap_run,
                     "c" => dap_continue,
diff --git a/helix-term/src/ui/editor.rs b/helix-term/src/ui/editor.rs
index 04cee3db..1f4fc1c5 100644
--- a/helix-term/src/ui/editor.rs
+++ b/helix-term/src/ui/editor.rs
@@ -30,6 +30,8 @@ use std::borrow::Cow;
 use crossterm::event::{Event, MouseButton, MouseEvent, MouseEventKind};
 use tui::buffer::Buffer as Surface;
 
+use super::{Prompt, PromptEvent};
+
 pub struct EditorView {
     keymaps: Keymaps,
     on_next_key: Option<Box<dyn FnOnce(&mut commands::Context, KeyEvent)>>,
@@ -712,6 +714,45 @@ impl EditorView {
     ) -> Option<KeymapResult> {
         self.autoinfo = None;
 
+        if let Some(picker) = cxt.editor.debug_config_picker.clone() {
+            match event {
+                KeyEvent {
+                    code: KeyCode::Esc, ..
+                } => {}
+                KeyEvent {
+                    code: KeyCode::Char(char),
+                    ..
+                } => {
+                    let name = match picker.iter().find(|t| t.starts_with(char)) {
+                        Some(n) => n.clone(),
+                        None => return None,
+                    };
+                    let prompt = Prompt::new(
+                        "arg:".to_owned(),
+                        None,
+                        |_input: &str| Vec::new(), // this is fine because Vec::new() doesn't allocate
+                        move |cx: &mut crate::compositor::Context,
+                              input: &str,
+                              event: PromptEvent| {
+                            if event != PromptEvent::Validate {
+                                return;
+                            }
+                            commands::dap_start_impl(
+                                cx.editor,
+                                Some(&name),
+                                None,
+                                Some(vec![input]),
+                            );
+                        },
+                    );
+                    cxt.push_layer(Box::new(prompt));
+                }
+                _ => return None,
+            }
+            cxt.editor.debug_config_picker = None;
+            return None;
+        }
+
         if cxt.editor.variables.is_some() {
             match event {
                 KeyEvent {
@@ -735,6 +776,7 @@ impl EditorView {
             }
             return None;
         }
+
         match self.keymaps.get_mut(&mode).unwrap().get(event) {
             KeymapResult::Matched(command) => command.execute(cxt),
             KeymapResult::Pending(node) => self.autoinfo = Some(node.into()),
@@ -1137,6 +1179,26 @@ impl Component for EditorView {
             info.render(area, surface, cx);
         }
 
+        if let Some(ref configs) = cx.editor.debug_config_picker {
+            let mut text = String::new();
+            let mut height = 0;
+            let mut max_len = 20;
+
+            for line in configs {
+                max_len = max_len.max(line.len() as u16 + 2);
+                height += 1;
+                text.push_str(&format!("{} {}\n", line.chars().next().unwrap(), line));
+            }
+
+            let mut info = Info {
+                height: 20.min(height + 1),
+                width: 70.min(max_len),
+                title: "Debug targets".to_owned(),
+                text: text + "Exit Esc",
+            };
+            info.render(area, surface, cx);
+        }
+
         if let Some(ref mut info) = self.autoinfo {
             info.render(area, surface, cx);
         }