coc-flutter-tools

Flutter support for (Neo)vim

What is this?

coc-flutter-tools is an active fork of coc-flutter, that fixes bugs and adds new features.

Big thanks to the author of coc-flutter @iamcco

Features of this fork:

• DevTools support
• Better DevLog Notifications (Notification Filtering)
• UI Path Display
• Flutter Outline Panel

Features

Make sure that you have the Flutter SDK path in the PATH environment variable

• LSP features (power by analysis_server)
• Auto-completion
• Diagnostics
• Auto-formatting
• Renaming elements
• Hovering support
• Signature help
• Jumping to definitions/implementations/references
• Highlighting
• Widget trees (flutter outline)
• Document symbols
• Code actions
• More detail
• Automatic hot reloading on save
• Automatically run flutter pub get on pubspec.yaml changes
• Flutter Dev Server support
• Snippets (enable with flutter.provider.enableSnippet)
• Device/Emulator List
• SDK switching

Installation

:CocInstall coc-flutter-tools

NOTE: The dart-vim-plugin plugin is recommended (for filetype detection and syntax highlighting)

Most likely the extension will find your SDK automatically as long as the flutter command maps to an SDK location on your system.

If you are using a version manager like asdf that maps the flutter command to another binary instead of an SDK location or this extension cannot find your SDK for another reason you'll have to provide the extension with how to find your SDK. To do this there are a few options:

1. If your version manager supports a which command like then you can set the flutter.sdk.flutter-lookup config option. Eg. "flutter.sdk.flutter-lookup": "asdf which flutter".
2. You can add the path where to find the SDK to the flutter.sdk.searchPaths config option. Either specify the exact folder the SDK is installed in or a folder that contains other folders which directly have an SDK in them. Note that not all of these folders need to have an SDK, if they don't contain one they will simply be ignored
3. Set the flutter.sdk.path config option to the exact path you want to use for your SDK. If you have also set the flutter.sdk.searchPaths then you can use the FlutterSdks list (see below) to see what versions you have installed and set the config option for you. Note that this means that the flutter.sdk.path option will be overriden by this list

coc-list sources

• FlutterSdks

  :CocList FlutterSdks Shows all the sdks that can be found by using the searchPaths config and the flutter-lookup config options and allows you to switch between them, either only for your current workspace or globally. Besides those two ways to find sdks it also checks if you are using fvm and if so uses those directories to find your sdk. You can disable this using the flutter.fvm.enabled config option.

  You can also use this list to see what your current sdk is since it will have (current) behind it clearly.

• Flutter Devices: :CocList FlutterDevices

• Flutter Emulators: :CocList FlutterEmulators

Settings

• flutter.enabled Enables coc-flutter-tools, default: true
• flutter.lsp.initialization.onlyAnalyzeProjectsWithOpenFiles: default: true

  When set to true, analysis will only be performed for projects that have open files rather than the root workspace folder.

• flutter.lsp.initialization.suggestFromUnimportedLibraries: default: true

  When set to false, completion will not include synbols that are not already imported into the current file

• flutter.lsp.initialization.closingLabels: default: true

  When set to true, will display closing labels at end of closing, only neovim support.

• flutter.UIPath: default: true

  When set to true, will display the path of the selected UI component on the status bar

• flutter.outlineWidth controls the default width of the flutter outline panel. default: 30
• flutter.outlineIconPadding controls The number of spaces between the icon and the item text in the outline panel. default: 0
• flutter.sdk.searchPaths the paths to search for flutter sdks, either directories where flutter is installed or directories which contain directories where flutter versions have been installed eg. /path/to/flutter (command at /path/to/flutter/bin/flutter) or ~/flutter_versions (command at ~/flutter_versions/version/bin/flutter).
• flutter.sdk.dart-command dart command, leave empty should just work, default: ''
• flutter.sdk.dart-lookup only use this if you don't have a flutter installation but only dart command to find dart executable location, used to infer dart-sdk location, default: ''
• flutter.sdk.flutter-lookup command to find flutter executable location, used to infer location of dart-sdk in flutter cache: ''
• flutter.provider.hot-reload Enable hot reload after save, default: true

  only when there are no errors for the save file

• flutter.provider.enableSnippet Enable completion item snippet, default: true
  • import ''; => import '${1}';${0}
  • someName(…) => someName(${1})${0}
  • setState(() {}); => setState(() {\n\t${1}\n});${0}
• flutter.openDevLogSplitCommand Vim command to open dev log window, like: botright 10split, default: ''
• flutter.workspaceFolder.ignore Path start within the list will not treat as workspaceFolder, default: []
  • also flutter sdk will not treat as workspaceFolder, more detail issues 50
• flutter.runDevToolsAtStartup Automatically open devtools debugger web page when a project is run, default: false
• flutter.autoOpenDevLog Automatically open the dev log after calling flutter run, default: false
• flutter.autoHideDevLog Automatically hide the dev log when the app stops running, default: false

Enable format on save:

If you have dart-vim-plugin install, put this in your vimrc:

let g:dart_format_on_save = 1

Alternatively, you may use coc-settings.

"coc.preferences.formatOnSaveFiletypes": [
  "dart"
],

Code Actions

coc.nvim provides code actions. To enable them, add the following configuration in your vimrc

this can also be found in coc.nvim README

xmap <leader>a  <Plug>(coc-codeaction-selected)
nmap <leader>a  <Plug>(coc-codeaction-selected)

To show code actions on selected areas:

• <leader>aap for current paragraph, <leader>aw for the current word

Then you will see a list of code actions:

• Wrap with Widget
• Wrap with Center
• etc

Commands

Get a list of flutter related commands: CocList --input=flutter commands

Global Commands:

• flutter.run Run flutter dev server
• flutter.attach Attach running application
• flutter.create Create flutter project using: flutter create
• flutter.doctor Run: flutter doctor
• flutter.upgrade Run: flutter upgrade
• flutter.pub.get Run: flutter pub get
• flutter.devices open devices list
• flutter.emulators open emulators list
• flutter.outline opens up an instance of the flutter outline side-panel
• flutter.toggleOutline toggles the flutter outline side-panel

LSP Commands

• flutter.gotoSuper jump to the location of the super definition of the class or method

Dev Server Commands:

These commands will only be available when the Flutter Dev Server is running (i.e after you run flutter run)

• flutter.dev.quit Quit server
• flutter.dev.detach Detach server
• flutter.dev.hotReload Hot reload
• flutter.dev.hotRestart Hot restart
• flutter.dev.screenshot To save a screenshot to flutter.png
• flutter.dev.openDevLog Open flutter dev server log
• flutter.dev.clearDevLog Clear the flutter dev server log
• flutter.dev.debugDumpAPP You can dump the widget hierarchy of the app (debugDumpApp)
• flutter.dev.elevationChecker To toggle the elevation checker
• flutter.dev.debugDumpLayerTree For layers (debugDumpLayerTree)
• flutter.dev.debugDumpRenderTree To dump the rendering tree of the app (debugDumpRenderTree)
• flutter.dev.openDevToolsProfiler Open the DevTools in the browser
• flutter.dev.debugPaintSizeEnabled To toggle the display of construction lines (debugPaintSizeEnabled)
• flutter.dev.defaultTargetPlatform To simulate different operating systems, (defaultTargetPlatform)
• flutter.dev.showPerformanceOverlay To display the performance overlay (WidgetsApp.showPerformanceOverlay)
• flutter.dev.debugProfileWidgetBuilds To enable timeline events for all widget build methods, (debugProfileWidgetBuilds)
• flutter.dev.showWidgetInspectorOverride To toggle the widget inspector (WidgetsApp.showWidgetInspectorOverride)
• flutter.dev.debugDumpSemanticsHitTestOrder Accessibility (debugDumpSemantics) for inverse hit test order
• flutter.dev.debugDumpSemanticsTraversalOrder Accessibility (debugDumpSemantics) for traversal order

Closing Labels

when flutter.lsp.initialization.closingLabels is set to true, the closing labels will be display at end of closing.

this feature only support neovim since vim do not support virtual text

disabled	enabled

UI Path

when flutter.UIPath is set to true, the path for the UI component under cursor will be shown on the status bar.

Flutter Outline

In the Flutter Outline panel, press enter to goto the corresponding location in the source file.