feat(flutter): use up-to-date zsh completion (#11062)

plugins/flutter/_flutter

-#compdef flutter
-#autoload
-
-local -a _1st_arguments
-_1st_arguments=(
-  "analyze":"Analyze the project's Dart code."
-  "assemble":"Assemble and build flutter resources."
-  "attach":"Attach to a running application."
-  "build":"Flutter build commands."
-  "channel":"List or switch flutter channels."
-  "clean":"Delete the build/ and .dart_tool/ directories."
-  "config":"Configure Flutter settings."
-  "create":"Create a new Flutter project."
-  "devices":"List all connected devices."
-  "doctor":"Show information about the installed tooling."
-  "drive":"Runs Flutter Driver tests for the current project."
-  "emulators":"List, launch and create emulators."
-  "format":" Format one or more dart files."
-  "help":"Display help information for flutter."
-  "install":"Install a Flutter app on an attached device."
-  "logs":"Show log output for running Flutter apps."
-  "make-host-app-editable":"Moves host apps from generated directories to non-generated directories so that they can be edited by developers."
-  "precache":"Populates the Flutter tool's cache of binary artifacts."
-  "pub":"Commands for managing Flutter packages."
-  "run":"Run your Flutter app on an attached device."
-  "screenshot":"Take a screenshot from a connected device."
-  "test":"Run Flutter unit tests for the current project."
-  "upgrade":"Upgrade your copy of Flutter."
-  "version":"List or switch flutter versions."
-)
-
-_arguments -C '*:: :->subcmds'
-
-if (( CURRENT == 1 )); then
-  _describe -t commands "flutter command" _1st_arguments
-  return
-fi

plugins/flutter/flutter.plugin.zsh

@@ -12,3 +12,18 @@ alias flrd="flutter run --debug"
 alias flrp="flutter run --profile"
 alias flrr="flutter run --release"
 alias flupgrd="flutter upgrade"
+
+# COMPLETION FUNCTION
+if (( ! $+commands[flutter] )); then
+  return
+fi
+
+# If the completion file doesn't exist yet, we need to autoload it and
+# bind it to `flutter`. Otherwise, compinit will have already done that.
+if [[ ! -f "$ZSH_CACHE_DIR/completions/_flutter" ]]; then
+  typeset -g -A _comps
+  autoload -Uz _flutter
+  _comps[flutter]=_flutter
+fi
+
+flutter zsh-completion >| "$ZSH_CACHE_DIR/completions/_flutter" &|
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