#+TITLE: dart layer

#+TAGS: general|layer|multi-paradigm|programming

[[file:img/dart.png]]

* Table of Contents                     :TOC_5_gh:noexport:
- [[#description][Description]]
  - [[#features][Features:]]
- [[#install][Install]]
  - [[#layer][Layer]]
  - [[#dart-sdk-location][Dart SDK location]]
    - [[#flutter-integration][Flutter integration]]
- [[#configuration][Configuration]]
  - [[#use-analysis-server][Use analysis server]]
  - [[#format-on-save][Format on save]]
- [[#key-bindings][Key bindings]]
  - [[#normal-mode][Normal mode]]
  - [[#insert-mode][Insert mode]]
  - [[#popup-screens][Popup screens]]

* Description
This layer adds support for Dart language, and could be optionally used for Flutter development as well.

** Features:
- Syntax Highlight
- Error checking with ~flycheck~
- Go to Definition
- Dart Analyzer integration
- Key bindings

* Install
** Layer
To use this configuration layer, add it to your =~/.spacemacs=. You will need to
add =dart= to the existing =dotspacemacs-configuration-layers= list in this
file.

** Dart SDK location
The layer itself will use the `dart` executable location if available on the execution path, but it is possible to define the location manually.
It should point to the folder, and end with `/`.

#+BEGIN_SRC elisp
  (dart :variables dart-sdk-path "~/path/to/dart-sdk/")
#+END_SRC

*** Flutter integration
Flutter comes with a internal Dart SDK, which can be used to provide all the integration tools.

#+BEGIN_SRC elisp
  (dart :variables dart-sdk-path "<flutter-location>/bin/cache/dart-sdk/")
#+END_SRC

* Configuration
For more available variables check [[https://github.com/bradyt/dart-mode][dart-mode]] documentation.

** Use analysis server
#+BEGIN_SRC elisp
  (dart :variables dart-enable-analysis-server t)
#+END_SRC

** Format on save
#+BEGIN_SRC elisp
  (dart :variables dart-format-on-save t)
#+END_SRC

* Key bindings
** Normal mode
Some of the commands will instantiate a new Dart Analyzer server if
necessary, while others work without using a Dart Analyzer connection.

When ~dart-enable-analysis-server~ is enabled, most of the commands become Async, and there might be a delay when executing them.

| Key binding            | Description                                       |
|------------------------+---------------------------------------------------|
| ~SPC m h h~, ~SPC m ?~ | Displays hover information for the current point. |
| ~SPC m h b~            | Displays information at point on a new buffer.    |
| ~gd~, ~SPC m g~        | Go to definition.                                 |
| ~SPC m f f~            | Find reference at point.                          |
| ~SPC m f d~            | Find members declarations by name.                |
| ~SPC m f r~            | Find members references by name.                  |
| ~SPC m f d~            | Find top-level declarations by name.              |
| ~SPC m =~              | Format buffer                                     |

** Insert mode

| Key binding | Description                                      |
|-------------+--------------------------------------------------|
| ~<tab>~     | Expand previous word using Analyzer if available |
| ~C-<tab>~   | Expand including parameters                      |

** Popup screens

| Key binding | Description                               |
|-------------+-------------------------------------------|
| ~q~         | Close popup                               |
| ~gr~        | Execute last command to repopulate buffer |