Allow disabling of automatic widget re-binding

Addresses github #411

README.md

@@ -69,6 +69,10 @@ This can be useful when pasting large amount of text in the terminal, to avoid t
 
 As of `v0.4.0`, suggestions can be fetched asynchronously. To enable this behavior, set the `ZSH_AUTOSUGGEST_USE_ASYNC` variable (it can be set to anything).
 
+### Disabling automatic widget re-binding
+
+Set `ZSH_AUTOSUGGEST_MANUAL_REBIND` (it can be set to anything) to disable automatic widget re-binding on each precmd. This can be a big boost to performance, but you'll need to handle re-binding yourself if any of the widget lists change or if you or another plugin wrap any of the autosuggest widgets. To re-bind widgets, run `_zsh_autosuggest_bind_widgets`.
+
 
 ### Key Bindings
 

spec/options/widget_lists_spec.rb

@@ -94,4 +94,27 @@ describe 'a modification to the widget lists' do
       wait_for { session.content(esc_seqs: true) }.to eq('echo hello')
     end
   end
+
+  context 'when manual rebind is enabled' do
+    let(:options) { ["ZSH_AUTOSUGGEST_MANUAL_REBIND=true"] }
+
+    it 'does not take effect until bind command is re-run' do
+      with_history('echo hello') do
+        session.send_string('e')
+        wait_for { session.content }.to eq('echo hello')
+        session.send_keys('C-b')
+        sleep 1
+        expect(session.content(esc_seqs: true)).not_to eq('echo hello')
+
+        session.send_keys('C-c')
+        session.run_command('_zsh_autosuggest_bind_widgets').clear_screen
+        wait_for { session.content }.to eq('')
+
+        session.send_string('e')
+        wait_for { session.content }.to eq('echo hello')
+        session.send_keys('C-b')
+        wait_for { session.content(esc_seqs: true) }.to eq('echo hello')
+      end
+    end
+  end
 end

src/start.zsh

@@ -5,15 +5,17 @@
 
 # Start the autosuggestion widgets
 _zsh_autosuggest_start() {
-	add-zsh-hook -d precmd _zsh_autosuggest_start
+	# By default we re-bind widgets on every precmd to ensure we wrap other
+	# wrappers. Specifically, highlighting breaks if our widgets are wrapped by
+	# zsh-syntax-highlighting widgets. This also allows modifications to the
+	# widget list variables to take effect on the next precmd. However this has
+	# a decent performance hit, so users can set ZSH_AUTOSUGGEST_MANUAL_REBIND
+	# to disable the automatic re-binding.
+	if (( ${+ZSH_AUTOSUGGEST_MANUAL_REBIND} )); then
+		add-zsh-hook -d precmd _zsh_autosuggest_start
+	fi
 
 	_zsh_autosuggest_bind_widgets
-
-	# Re-bind widgets on every precmd to ensure we wrap other wrappers.
-	# Specifically, highlighting breaks if our widgets are wrapped by
-	# zsh-syntax-highlighting widgets. This also allows modifications
-	# to the widget list variables to take effect on the next precmd.
-	add-zsh-hook precmd _zsh_autosuggest_bind_widgets
 }
 
 # Start the autosuggestion widgets on the next precmd

zsh-autosuggestions.zsh

@@ -669,15 +669,17 @@ _zsh_autosuggest_async_response() {
 
 # Start the autosuggestion widgets
 _zsh_autosuggest_start() {
-	add-zsh-hook -d precmd _zsh_autosuggest_start
+	# By default we re-bind widgets on every precmd to ensure we wrap other
+	# wrappers. Specifically, highlighting breaks if our widgets are wrapped by
+	# zsh-syntax-highlighting widgets. This also allows modifications to the
+	# widget list variables to take effect on the next precmd. However this has
+	# a decent performance hit, so users can set ZSH_AUTOSUGGEST_MANUAL_REBIND
+	# to disable the automatic re-binding.
+	if (( ${+ZSH_AUTOSUGGEST_MANUAL_REBIND} )); then
+		add-zsh-hook -d precmd _zsh_autosuggest_start
+	fi
 
 	_zsh_autosuggest_bind_widgets
-
-	# Re-bind widgets on every precmd to ensure we wrap other wrappers.
-	# Specifically, highlighting breaks if our widgets are wrapped by
-	# zsh-syntax-highlighting widgets. This also allows modifications
-	# to the widget list variables to take effect on the next precmd.
-	add-zsh-hook precmd _zsh_autosuggest_bind_widgets
 }
 
 # Start the autosuggestion widgets on the next precmd