From 2e0d0995d62c935f7e926020fb6e7101c3d9df4c Mon Sep 17 00:00:00 2001
From: Guldoman <giulio.lettieri@gmail.com>
Date: Sat, 30 Apr 2022 22:09:40 +0200
Subject: [PATCH] Add typeahead to `CommandView` (#963)

---
 data/core/commandview.lua | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/data/core/commandview.lua b/data/core/commandview.lua
index 2b91e30e..b102c43b 100644
--- a/data/core/commandview.lua
+++ b/data/core/commandview.lua
@@ -36,6 +36,7 @@ function CommandView:new()
   self.suggestions_height = 0
   self.show_suggestions = true
   self.last_change_id = 0
+  self.last_text = ""
   self.gutter_width = 0
   self.gutter_text_brightness = 0
   self.selection_offset = 0
@@ -80,6 +81,7 @@ end
 
 
 function CommandView:set_text(text, select)
+  self.last_text = text
   self.doc:remove(1, 1, math.huge, math.huge)
   self.doc:text_input(text)
   if select then
@@ -161,6 +163,7 @@ function CommandView:exit(submitted, inexplicit)
   if not submitted then cancel(not inexplicit) end
   self.show_suggestions = true
   self.save_suggestion = nil
+  self.last_text = ""
 end
 
 
@@ -198,6 +201,16 @@ function CommandView:update()
   -- update suggestions if text has changed
   if self.last_change_id ~= self.doc:get_change_id() then
     self:update_suggestions()
+    if self.suggestions[self.suggestion_idx] then
+      local current_text = self:get_text()
+      local suggested_text = self.suggestions[self.suggestion_idx].text or ""
+      if #self.last_text < #current_text and
+         string.find(suggested_text, current_text, 1, true) == 1 then
+        self:set_text(suggested_text)
+        self.doc:set_selection(1, #current_text + 1, 1, math.huge)
+      end
+      self.last_text = current_text
+    end
     self.last_change_id = self.doc:get_change_id()
   end