From 56f2193811fca2fa20284442c2042fa271464445 Mon Sep 17 00:00:00 2001
From: Blaž Hrastnik
Date: Wed, 23 Dec 2020 16:20:49 +0900
Subject: Retrieve completion options on ctrl-x.

---
 helix-term/src/application.rs |  8 +++++++-
 helix-term/src/commands.rs    | 29 +++++++++++++++++++++++++++++
 helix-term/src/compositor.rs  |  1 +
 helix-term/src/keymap.rs      |  2 ++
 helix-term/src/ui/editor.rs   |  1 +
 helix-term/src/ui/picker.rs   |  5 +++--
 6 files changed, 43 insertions(+), 3 deletions(-)

(limited to 'helix-term/src')

diff --git a/helix-term/src/application.rs b/helix-term/src/application.rs
index e15f21c6..138f55c2 100644
--- a/helix-term/src/application.rs
+++ b/helix-term/src/application.rs
@@ -69,10 +69,15 @@ impl Application {
 
     fn render(&mut self) {
         let executor = &self.executor;
+        let language_servers = &self.language_servers;
         let editor = &mut self.editor;
         let compositor = &self.compositor;
 
-        let mut cx = crate::compositor::Context { editor, executor };
+        let mut cx = crate::compositor::Context {
+            editor,
+            executor,
+            language_servers,
+        };
         let area = self.terminal.size().unwrap();
 
         compositor.render(area, self.terminal.current_buffer_mut(), &mut cx);
@@ -113,6 +118,7 @@ impl Application {
         let mut cx = crate::compositor::Context {
             editor: &mut self.editor,
             executor: &self.executor,
+            language_servers: &self.language_servers,
         };
         // Handle key events
         let should_redraw = match event {
diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index b4b64249..eb23041c 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -22,6 +22,7 @@ pub struct Context<'a, 'b> {
     pub count: usize,
     pub view: &'a mut View,
     pub executor: &'a smol::Executor<'b>,
+    pub language_servers: &'a helix_lsp::Registry,
 
     pub callback: Option<crate::compositor::Callback>,
 }
@@ -831,3 +832,31 @@ pub fn save(cx: &mut Context) {
     // TODO: handle save errors somehow?
     cx.executor.spawn(cx.view.doc.save()).detach();
 }
+
+pub fn completion(cx: &mut Context) {
+    let language_server = cx.language_servers.get("rust", &cx.executor).unwrap();
+    use log::info;
+
+    // TODO: blocking here is not ideal
+    let res = smol::block_on(language_server.completion(&cx.view.doc)).expect("completion failed!");
+
+    let picker = ui::Picker::new(
+        res,
+        |item| {
+            // format_fn
+            item.label.as_str().into()
+        },
+        |editor: &mut Editor, item| {
+            //
+        },
+    );
+
+    cx.callback = Some(Box::new(
+        move |compositor: &mut Compositor, editor: &mut Editor| {
+            compositor.push(Box::new(picker));
+        },
+    ));
+
+    // TODO: when iterating over items, show the docs in popup
+    // language server client needs to be accessible via a registry of some sort
+}
diff --git a/helix-term/src/compositor.rs b/helix-term/src/compositor.rs
index b1b92a71..c507b174 100644
--- a/helix-term/src/compositor.rs
+++ b/helix-term/src/compositor.rs
@@ -39,6 +39,7 @@ use helix_view::{Editor, View};
 // shared with commands.rs
 pub struct Context<'a> {
     pub editor: &'a mut Editor,
+    pub language_servers: &'a helix_lsp::Registry,
     pub executor: &'static smol::Executor<'static>,
 }
 
diff --git a/helix-term/src/keymap.rs b/helix-term/src/keymap.rs
index c1677847..132c81d0 100644
--- a/helix-term/src/keymap.rs
+++ b/helix-term/src/keymap.rs
@@ -208,6 +208,8 @@ pub fn default() -> Keymaps {
                     code: KeyCode::Tab,
                     modifiers: Modifiers::NONE
                 }] => commands::insert::insert_tab,
+
+                vec![ctrl!('x')] => commands::completion,
             ),
             Mode::Goto => hashmap!(
                 vec![Key {
diff --git a/helix-term/src/ui/editor.rs b/helix-term/src/ui/editor.rs
index 1bab2eef..25221922 100644
--- a/helix-term/src/ui/editor.rs
+++ b/helix-term/src/ui/editor.rs
@@ -263,6 +263,7 @@ impl Component for EditorView {
                     let mut cx = commands::Context {
                         view,
                         executor: cx.executor,
+                        language_servers: cx.language_servers,
                         count: 1,
                         callback: None,
                     };
diff --git a/helix-term/src/ui/picker.rs b/helix-term/src/ui/picker.rs
index d4e4d46d..a46886ee 100644
--- a/helix-term/src/ui/picker.rs
+++ b/helix-term/src/ui/picker.rs
@@ -196,12 +196,13 @@ impl<T> Component for Picker<T> {
 
         // -- Render the frame:
 
-        // clear  area
+        // clear area
         let background = cx.editor.theme.get("ui.background");
         for y in area.top()..area.bottom() {
             for x in area.left()..area.right() {
                 let cell = surface.get_mut(x, y);
-                cell.symbol.clear();
+                cell.reset();
+                // cell.symbol.clear();
                 cell.set_style(background);
             }
         }
-- 
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