From 3197c2536ecb0f4f7aa4dfb75ece549b72249541 Mon Sep 17 00:00:00 2001
From: Dmitry Sharshakov <d3dx12.xx@gmail.com>
Date: Sun, 22 Aug 2021 14:44:16 +0300
Subject: [PATCH] Add eval command

---
 helix-dap/src/client.rs    | 15 +++++++++++++++
 helix-dap/src/types.rs     | 31 +++++++++++++++++++++++++++++++
 helix-term/src/commands.rs | 21 +++++++++++++++++++++
 3 files changed, 67 insertions(+)

diff --git a/helix-dap/src/client.rs b/helix-dap/src/client.rs
index ebaae83cd..98b88e239 100644
--- a/helix-dap/src/client.rs
+++ b/helix-dap/src/client.rs
@@ -352,4 +352,19 @@ impl Client {
 
         self.request::<requests::Pause>(args).await
     }
+
+    pub async fn eval(
+        &mut self,
+        expression: String,
+        frame_id: Option<usize>,
+    ) -> Result<requests::EvaluateResponse> {
+        let args = requests::EvaluateArguments {
+            expression,
+            frame_id,
+            context: None,
+            format: None,
+        };
+
+        self.request::<requests::Evaluate>(args).await
+    }
 }
diff --git a/helix-dap/src/types.rs b/helix-dap/src/types.rs
index 4ee796b35..bb73e5e9d 100644
--- a/helix-dap/src/types.rs
+++ b/helix-dap/src/types.rs
@@ -484,6 +484,37 @@ pub mod requests {
         type Result = ();
         const COMMAND: &'static str = "pause";
     }
+
+    #[derive(Debug, PartialEq, Clone, Deserialize, Serialize)]
+    #[serde(rename_all = "camelCase")]
+    pub struct EvaluateArguments {
+        pub expression: String,
+        pub frame_id: Option<usize>,
+        pub context: Option<String>,
+        pub format: Option<ValueFormat>,
+    }
+
+    #[derive(Debug, PartialEq, Clone, Deserialize, Serialize)]
+    #[serde(rename_all = "camelCase")]
+    pub struct EvaluateResponse {
+        pub result: String,
+        #[serde(rename = "type")]
+        pub data_type: Option<String>,
+        pub presentation_hint: Option<VariablePresentationHint>,
+        pub variables_reference: usize,
+        pub named_variables: Option<usize>,
+        pub indexed_variables: Option<usize>,
+        pub memory_reference: Option<String>,
+    }
+
+    #[derive(Debug)]
+    pub enum Evaluate {}
+
+    impl Request for Evaluate {
+        type Arguments = EvaluateArguments;
+        type Result = EvaluateResponse;
+        const COMMAND: &'static str = "evaluate";
+    }
 }
 
 // Events
diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index 3449d94b3..cc5ce67cd 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -1910,6 +1910,20 @@ mod cmd {
         Ok(())
     }
 
+    fn debug_eval(
+        cx: &mut compositor::Context,
+        args: &[&str],
+        _event: PromptEvent,
+    ) -> anyhow::Result<()> {
+        use helix_lsp::block_on;
+        if let Some(debugger) = cx.editor.debugger.as_mut() {
+            let id = debugger.stack_pointer.clone().map(|x| x.id);
+            let response = block_on(debugger.eval(args.join(" "), id))?;
+            cx.editor.set_status(response.result);
+        }
+        Ok(())
+    }
+
     pub const TYPABLE_COMMAND_LIST: &[TypableCommand] = &[
         TypableCommand {
             name: "quit",
@@ -2148,6 +2162,13 @@ mod cmd {
             doc: "Display tree sitter scopes, primarily for theming and development.",
             fun: tree_sitter_scopes,
             completer: None,
+        },
+        TypableCommand {
+            name: "debug-eval",
+            alias: None,
+            doc: "Evaluate expression in current debug context.",
+            fun: debug_eval,
+            completer: None,
         }
     ];