editor: add debug session config

helix-core/src/syntax.rs

@@ -58,6 +58,8 @@ pub struct LanguageConfiguration {
     pub(crate) indent_query: OnceCell<Option<IndentQuery>>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub debug_adapter: Option<DebugAdapterConfig>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub debug_configs: Option<Vec<HashMap<String, serde_json::Value>>>,
 }
 
 #[derive(Debug, Serialize, Deserialize)]

helix-term/src/commands.rs

@@ -4368,9 +4368,24 @@ fn dap_start(cx: &mut Context) {
     let request = debugger.initialize("go".to_owned());
     let _ = block_on(request).unwrap();
 
-    let mut args = HashMap::new();
-    args.insert("mode", "debug");
-    args.insert("program", "main.go");
+    let sessions = cx
+        .editor
+        .syn_loader
+        .language_config_for_file_name(&path)
+        .and_then(|x| x.debug_configs.clone());
+
+    let sessions = match sessions {
+        Some(c) => c,
+        None => {
+            cx.editor.set_error(
+                "Can't start debug: no debug sessions available for language".to_string(),
+            );
+            return;
+        }
+    };
+
+    // TODO: picker
+    let args = sessions.get(0);
 
     let request = debugger.launch(to_value(args).unwrap());
     let _ = block_on(request).unwrap();

languages.toml

@@ -95,6 +95,21 @@ language-server = { command = "gopls" }
 indent = { tab-width = 4, unit = "\t" }
 debug-adapter = { command = "dlv", args = ["dap"], port-arg = "-l 127.0.0.1:{}" }
 
+[[language.debug-configs]]
+request = "launch"
+mode = "debug"
+program = "main.go"
+
+[[language.debug-configs]]
+request = "launch"
+mode = "exec"
+program = "main"
+
+[[language.debug-configs]]
+request = "launch"
+mode = "test"
+program = "."
+
 [[language]]
 name = "javascript"
 scope = "source.js"