Mailspring-Theme-Starter

by Foundry376

A starting point for creating your own custom Mailspring themes!

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Mailspring Theme Starter

The Mailspring Theme Starter is a basic starting point for creating a theme for the Mailspring email client.

Getting Started

Creating a new theme in Mailspring is easy! Here's how you can do it.

  1. Fork this repo or download the code. Add a name, display name, title, and description for your theme to

    package.json
    , and change the directory name to match.
  2. Open Mailspring and install the theme by going to

    Mailspring > Install New Theme...
    and selecting the directory.
  3. Choose

    Developer > Run With Debug Flags
    for easier debugging.
  4. Now, you can start playing with the theme! It's installed in

    ~/Library/Application Support/Mailspring/packages/THEME_NAME
    (on macOS), so open it from there. Most of Mailspring's React components are derived from the core variables defined in
    ui-variables.less
    , and any changes you make there will override the defaults for Mailspring. You can also add more LESS files in
    styles
    (ideally, separated into logical components like
    thread-list.less
    ) to make your own specific changes. To reload the theme, just open the console (
    Developer > Toggle Developer Tools
    ) and type
   AppEnv.themes.setActiveTheme('ui-light');
   AppEnv.themes.setActiveTheme('your-theme-name');
  1. Once you're happy with your theme, check how it looks in the theme picker (
    Mailspring > Change Theme...
    ). We use your UI variables to pull the colors, but if you want to add your own selections to the color palette, create a
    theme-colors.less
    file that includes any of the variables that you want to change, and they'll only affect the theme preview. Here are the variables, on the left, with the part of the theme preview that they match:
   @background-secondary:     BACKGROUND_COLOR
   @text-color:               TEXT_COLOR, FIRST_SWATCH_COLOR
   @component-active-color:   MIDDLE_SWATCH_COLOR
   @toolbar-background-color: LAST_SWATCH_COLOR
   @panel-background-color:   STRIP_COLOR

Structure

.
├── styles                 # All stylesheets
|   ├── index.less             # Main LESS file to import your stylesheets
│   ├── ui-variables.less  # UI variables that override N1's defaults
│   ├── theme-colors.less  # Theme colors for theme preview (optional)
├── package.json           # Metadata about the theme
├── LICENSE.md             # License with usage rights
└── README.md              # Info about your theme and how to use it

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