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lemmur-app-android/CONTRIBUTING.md

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Contributing

...is welcome!

Issue tracking / Repository

From issues to wikis: everything is on GitHub

Linting / Formatting

Everything is formatted with dart format (no flags) and linted with dart analyze (see rules). Both are enforced by the CI.

Translations

Weblate

Lemmy devs are kindly hosting lemmur translation strings on their Weblate instance. Feel free to contribute strings there, we regularly sync string changes with Weblate.

We use flutter's native file format for translations: ARB, which itself uses the ICU message syntax. In most cases you will be able to deduce the syntax based on the source string. Here are 3 important examples:

  1. Placeholders

Hello there {name}! - placeholders are put in a pair of braces, it will be later replaced with an appropriate value.

  1. Plurals

You have {amount} new {amount, plural, =0{messages} =1{message} =2{messages} few{messages} many{messages} other{message}} - plurals are checked against their quantifier and provide 6 possible forms to choose from. In english this example does not make much sense, since we could just provide the =1{message} and other{messages} case. other case always has to be specified, it acts as a fallback.

  1. Selects

I will take a {distance_name, select, close{bus} far{train} veryFar{plane}}. - selects allow for arbitrary matching against some predefined cases. All cases should be the same as in the source string.

Time ago strings

Strings such as "About one hour ago" or "~1h" are localizable. We inherit a set of ready translations from github.com/andresaraujo/timeago.dart/messages and provide our own in lib/l10n/timeago.

To contribute time ago strings please send a PR containing a class that implements timeago.LookupMessages. Place it under lib/l10n/timeago with an appropriate name (locale tag) and finally register it in main_common.dart in the _setupTimeago function. Each locale can have a normal (for example "About one hour ago") and a short (for example "~1h") variant, there are registered separately.

Architecture

Lemmur is written in Dart using Flutter. To communicate with Lemmy instances lemmy_api_client is used.

State management

MobX + Provider is used for global state management, flutter_hooks is used for local (widget-level) state management. StatefulWidgets are avoided all together and any state logic reuse is moved to a custom hook.

Project structure

(relative to lib/)

  • hooks/: reusable state hooks
  • l10n/: files with localized strings and localizations tools
  • pages/: fullscreen pages that you navigate to
  • stores/: global stores
  • util/: utilities
  • widgets/: reusable widgets; building blocks for pages
  • main_common.dart: entrypoint of the app. Sets up the stores, initializes the themes, renders the first page

Things to keep in mind

  • Be aware that Lemmur supports arbitrary Lemmy instances, don't hardcode instance urls
  • Remember that a user is not obligated to be logged in, contributed widgets should handle this case

Lemmy API

LAC (Lemmy API Client) is used to communicate with Lemmy backends, more information can be found here.

For React developers

If you come from a React background Flutter shouldn't be anything hard to grasp for you.

  • Components are called 'widgets' in flutter
  • flutter_hooks is a React hooks port to flutter. Though you will come to see that flutter_hooks are not as powerful
  • There is no CSS. You compose your layout with other widgets and style them by passing properties
  • There are no functional components, everything needs to be a class
  • Creating wrapping widgets is not as nice as in React, there is no { ...props }. In flutter you need to pass each argument one by one