How to setup (neo)vim for Flutter / Dart with CoC and dart-vim plugin

On Fedora but probably most distros

Initial downloads

There are 3 things that should be downloaded:

Program	Download
Dart	https://flutter.dev/docs/get-started/install/linux
Flutter	https://dart.dev/tools/sdk/archive
Android Studio	https://developer.android.com/studio

Depending on the distro you might be able to find it in the repos. I just download them from the webpages, except flutter which I git clone as the page suggests.

Unzipping/extracting

I create a directory in my home directory called sdk. I just extract and stick everything in there, so I get something like the following under ~/sdk:

android-studio-ide-192.6392135-linux
dartsdk-linux-x64-release
flutter

Android studio setup

Now install and run android studio by running:

~/sdk/android-studio-ide-192.6392135-linux/android-studio/bin/studio.sh

Follow the instructions. When it's finished you might need to go into the SDK manager and enable "Android SDK Tools (Obsolete)" (see https://flutter.dev/docs/get-started/install/linux#install-android-studio) and any android SDKs you want.

Flutter setup

Next, make sure the flutter executable is accesible from $PATH. On my system ~/.local/bin is in $PATH, so I symlink it there:

ln -s ~/sdk/flutter/bin/flutter ~/.local/bin/flutter

and make sure ~/.local/bin actually exists.

Run

~/sdk/flutter/bin/flutter doctor

And check if you have any big problems, you probably don't. Some licenses may need to be accepted so do that (follow the instructions from the output).

Dart setup

Dart is needed for the LSP-server features that we will also want with flutter. You can also symlink this to somewhere in $PATH but it is not strictly needed for flutter. If you want to use dart on its' own it's probably a good idea.

(Neo)vim setup

Plugins

We will use two plugins to improve our experience with flutter/dart:

dart-vim-plugin provides filetype detection, syntax highlighting, and indentation for Dart code in Vim
coc.nvim as a LSP client

provided you use vim-plug add these plugs to get them:

Plug 'neoclide/coc.nvim', {'branch': 'release'}
Plug 'dart-lang/dart-vim-plugin'

coc-flutter extension

Install the coc-flutter extension by executing :CocInstall coc-flutter inside (neo)vim. See the coc-flutter page for more info.

Coc Config

Finally, you should configure the location of the dart LSP-server by adding the following to your coc config. make shure the paths are right:

"languageserver": {
"dart": {
  "command": "~/sdk/dartsdk-linux-x64-release/dart-sdk/bin/dart",
  "args": [
    "~/sdk/dartsdk-linux-x64-release/dart-sdk/bin/snapshots/analysis_server.dart.snapshot",
    "--lsp"
  ],
  "filetypes": ["dart"],
  "disableDynamicRegister": true,
  "trace.server": "verbose"
}
}

If this is the only thing in your config, enclose the whole thing in a set of {}'s. (You can open your config by executing :CocConfig inside (neo)vim)

Hvassaa / Vim-flutter-setup-guide