Make asynchronous suggestions disabled by default

While they are still experimental

README.md

@@ -94,9 +94,9 @@ Widgets that modify the buffer and are not found in any of these arrays will fet
 Set `ZSH_AUTOSUGGEST_BUFFER_MAX_SIZE` to an integer value to disable autosuggestion for large buffers. The default is unset, which means that autosuggestion will be tried for any buffer size. Recommended value is 20.
 This can be useful when pasting large amount of text in the terminal, to avoid triggering autosuggestion for too long strings.
 
-### Disable Asynchronous Mode
+### Enable Asynchronous Mode
 
-As of `v0.4.0`, suggestions are fetched asynchronously using the `zsh/zpty` module. To disable this behavior and fall back to fetching suggestions synchronously, unset the `ZSH_AUTOSUGGEST_USE_ASYNC` variable.
+As of `v0.4.0`, suggestions can be fetched asynchronously using the `zsh/zpty` module. To enable this behavior, set the `ZSH_AUTOSUGGEST_USE_ASYNC` variable (it can be set to anything).
 
 
 ### Key Bindings

spec/options/async_zpty_name_spec.rb

@@ -1,15 +1,19 @@
-describe 'the zpty for async suggestions' do
+context 'when async suggestions are enabled' do
+  let(:options) { ["ZSH_AUTOSUGGEST_USE_ASYNC="] }
+
+  describe 'the zpty for async suggestions' do
     it 'is created with the default name' do
       session.run_command('zpty -t zsh_autosuggest_pty &>/dev/null; echo $?')
       wait_for { session.content }.to end_with("\n0")
     end
 
     context 'when ZSH_AUTOSUGGEST_ASYNC_PTY_NAME is set' do
-    let(:options) { ['ZSH_AUTOSUGGEST_ASYNC_PTY_NAME=foo_pty'] }
+      let(:options) { super() + ['ZSH_AUTOSUGGEST_ASYNC_PTY_NAME=foo_pty'] }
 
       it 'is created with the specified name' do
         session.run_command('zpty -t foo_pty &>/dev/null; echo $?')
         wait_for { session.content }.to end_with("\n0")
       end
     end
+  end
 end

spec/options/use_async_spec.rb

@@ -1,7 +1,7 @@
 describe 'suggestion fetching' do
-  it 'is performed asynchronously'
-
-  context 'when ZSH_AUTOSUGGEST_USE_ASYNC is unset' do
   it 'is performed synchronously'
+
+  context 'when ZSH_AUTOSUGGEST_USE_ASYNC is set' do
+    it 'is performed asynchronously'
   end
 end

src/config.zsh

@@ -61,8 +61,5 @@ ZSH_AUTOSUGGEST_IGNORE_WIDGETS=(
 # Max size of buffer to trigger autosuggestion. Leave undefined for no upper bound.
 ZSH_AUTOSUGGEST_BUFFER_MAX_SIZE=
 
-# Use asynchronous mode by default. Unset this variable to use sync mode.
-ZSH_AUTOSUGGEST_USE_ASYNC=
-
 # Pty name for calculating autosuggestions asynchronously
 ZSH_AUTOSUGGEST_ASYNC_PTY_NAME=zsh_autosuggest_pty

zsh-autosuggestions.zsh

@@ -97,9 +97,6 @@ ZSH_AUTOSUGGEST_IGNORE_WIDGETS=(
 # Max size of buffer to trigger autosuggestion. Leave undefined for no upper bound.
 ZSH_AUTOSUGGEST_BUFFER_MAX_SIZE=
 
-# Use asynchronous mode by default. Unset this variable to use sync mode.
-ZSH_AUTOSUGGEST_USE_ASYNC=
-
 # Pty name for calculating autosuggestions asynchronously
 ZSH_AUTOSUGGEST_ASYNC_PTY_NAME=zsh_autosuggest_pty