#+TITLE:   lang/dart
#+DATE:    February 16, 2020
#+SINCE:   v3.0.0
#+STARTUP: inlineimages nofold

* Table of Contents :TOC_3:noexport:
- [[#description][Description]]
  - [[#maintainers][Maintainers]]
  - [[#module-flags][Module Flags]]
  - [[#plugins][Plugins]]
- [[#prerequisites][Prerequisites]]
  - [[#installing-dart-sdk][Installing Dart SDK]]
  - [[#installing-flutter-sdk][Installing Flutter SDK]]
- [[#features][Features]]
- [[#configuration][Configuration]]
  - [[#dart--flutter][Dart & Flutter]]
  - [[#android][Android]]
- [[#troubleshooting][Troubleshooting]]

* Description
[[https://dart.dev/][Dart]] is a client-optimized language by Google for fast apps on any platform.
It is fast and optimized for UI, Famous for the [[https://flutter.io/][Flutter]] framework, also
made by Google. Both Flutter and Dart are free and open-source.

** Maintainers
This module has no dedicated maintainers.

** Module Flags
The `dart` module wraps `dart-mode`, with LSP code completion for `.dart` files,
syntax highlighting, etc. Included is a `+lsp` flag for enabling LSP features,
and a `+flutter` flag for working with Flutter.

+ =+lsp= Will start LSP automatically in `dart-mode-hook`.
+ =+flutter= Adds the `flutter` package and some settings for Flutter development.

** Plugins
+ [[https://github.com/bradyt/dart-mode][dart-mode]]
+ [[https://github.com/amake/flutter.el][flutter.el]]

* Prerequisites
Make sure that the Dart SDK is on your `PATH`, and if using Flutter, make sure
the Flutter binary is on your `PATH` as well.

** Installing Dart SDK
Before starting note that Flutter SDK will have a version of Dart. Therefore,
there is no need to install Dart. If you want to use Flutter just see
the next part.

The stable version of the SDK is in most major distributions repositories.
If you find it necessary to install any other version or build from source,
please refer to the official website at: https://dart.dev/get-dart

On Debian (also Ubuntu and its derivations), you can simply install the SDK via:
#+BEGIN_SRC shell
sudo apt-get install dart
#+END_SRC
Or on Arch (and its derivations, like Manjaro), you can install it using:
#+BEGIN_SRC shell
sudo pacman -S dart
#+END_SRC
And finally in MacOS, the [[https://brew.sh/][Homebrew]] can come in handy. If you have it installed
just run:
#+BEGIN_SRC shell
brew tap dart-lang/dart
brew install dart#+END_SRC
#+END_SRC

** Installing Flutter SDK
Due to complications with permissions, it is suggested not to use AUR or any
automatic installation tools for Flutter SDK.

On any system just run the following commands to install Flutter, once you have
met dependencies named on [[https://flutter.dev/docs/get-started/install/][the site]]:
#+BEGIN_SRC shell
git clone https://github.com/flutter/flutter --branch stable # to download Flutter
export PATH="$PATH:$(pwd)/flutter/bin" # to add it to PATH
flutter doctor # for Dependency check and further instructions
#+END_SRC

* Features
+ Syntax highlighting and formatting for `.dart` files provided by LSP
+ Emacs functions for running and debugging Flutter projects

* Configuration
** Dart & Flutter
On Linux, the installers for Dart and Flutter use the `/opt` directory, and this
module assumes that. However, you may set `lsp-dart-sdk-dir` to your Dart
install directory, if it differs, to make sure LSP can find the language server
included with the Dart SDK.

Alternatively, these variables shouldn't be necessary if you just include Dart
and Flutter on your `PATH` variable.
** Android
You will also need to setup your system for Android development if you intend to
use Flutter to develop mobile applications. Refer to your distributions package
manager for details. In most distributions the `/opt/android-sdk` directory is
used, and you might have to change some permissions in this directory since it's
owned by root. The [[https://wiki.archlinux.org/index.php/Android][Arch Linux wiki has a great guide on this here.]]

* Troubleshooting
See the configuration section for information on the binaries for Dart and
Flutter. On new installs to the `/opt` directory, you will likely need to edit
the permissions of the `/opt/dart-sdk` and `/opt/flutter` directories (not to
mention the Android SDK, as discussed above).