From 8098e9bdcd85890d86b45be4e889604f651d7f8c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bla=C5=BE=20Hrastnik?= <blaz@mxxn.io>
Date: Mon, 29 Mar 2021 16:47:02 +0900
Subject: [PATCH] Allow setting a status message.

---
 helix-term/src/commands.rs  | 12 +++++++++++-
 helix-term/src/ui/editor.rs | 13 +++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index d2aa481af..fa7a41625 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -35,6 +35,7 @@ pub struct Context<'a> {
     pub callback: Option<crate::compositor::Callback>,
     pub on_next_key_callback: Option<Box<dyn FnOnce(&mut Context, KeyEvent)>>,
     pub callbacks: &'a mut LspCallbacks,
+    pub status_msg: Option<String>,
 }
 
 use futures_util::FutureExt;
@@ -87,6 +88,11 @@ impl<'a> Context<'a> {
         });
         self.callbacks.push(callback);
     }
+
+    // TODO: allow &'static str?
+    pub fn set_status(&mut self, msg: String) {
+        self.status_msg = Some(msg);
+    }
 }
 
 /// A command is a function that takes the current state and a count, and does a side-effect on the
@@ -1378,7 +1384,7 @@ pub fn redo(cx: &mut Context) {
 pub fn yank(cx: &mut Context) {
     // TODO: should selections be made end inclusive?
     let doc = cx.doc();
-    let values = doc
+    let values: Vec<String> = doc
         .selection()
         .fragments(doc.text().slice(..))
         .map(|cow| cow.into_owned())
@@ -1386,7 +1392,11 @@ pub fn yank(cx: &mut Context) {
 
     // TODO: allow specifying reg
     let reg = '"';
+    let msg = format!("yanked {} selection(s) to register {}", values.len(), reg);
+
     register::set(reg, values);
+
+    cx.set_status(msg)
 }
 
 pub fn paste(cx: &mut Context) {
diff --git a/helix-term/src/ui/editor.rs b/helix-term/src/ui/editor.rs
index bd0398a22..b02bd9811 100644
--- a/helix-term/src/ui/editor.rs
+++ b/helix-term/src/ui/editor.rs
@@ -26,6 +26,7 @@ use tui::{
 pub struct EditorView {
     keymap: Keymaps,
     on_next_key: Option<Box<dyn FnOnce(&mut commands::Context, KeyEvent)>>,
+    status_msg: Option<String>,
 }
 
 const OFFSET: u16 = 7; // 1 diagnostic + 5 linenr + 1 gutter
@@ -35,6 +36,7 @@ impl EditorView {
         Self {
             keymap: keymap::default(),
             on_next_key: None,
+            status_msg: None,
         }
     }
 
@@ -68,6 +70,12 @@ impl EditorView {
             1,
         );
         self.render_statusline(&doc, area, surface, theme, is_focused);
+
+        // render status
+        if let Some(status_msg) = &self.status_msg {
+            let style = Style::default().fg(Color::Rgb(164, 160, 232)); // lavender
+            surface.set_string(viewport.x, viewport.y + viewport.height, status_msg, style);
+        }
     }
 
     pub fn render_buffer(
@@ -441,8 +449,12 @@ impl Component for EditorView {
                     callback: None,
                     callbacks: cx.callbacks,
                     on_next_key_callback: None,
+                    status_msg: None,
                 };
 
+                // clear status
+                self.status_msg = None;
+
                 if let Some(on_next_key) = self.on_next_key.take() {
                     // if there's a command waiting input, do that first
                     on_next_key(&mut cxt, event);
@@ -486,6 +498,7 @@ impl Component for EditorView {
                 }
 
                 self.on_next_key = cxt.on_next_key_callback.take();
+                self.status_msg = cxt.status_msg.take();
 
                 // appease borrowck
                 let callback = cxt.callback.take();