HAML - All in One
A powerful VS Code extension providing essential tools for efficient and seamless HAML development.


Features
The following features are supported to make your HAML development effortless:
| Status |
Feature |
Requirement/Infos |
| ✅ |
Syntax Highlighting |
|
| ✅ |
Linter |
Require haml_lint gem |
| ✅ |
HAML Formatter |
Requires haml_lint and rubocop gems |
| ✅ |
Partial: Go to Definition |
|
| ✅ |
Partial: Autocompletion |
|
| ✅ |
Data Attributes Completion |
HTML, Rails UJS, Turbo Rails & Stimulus |
| ✅ |
Routes: Autocompletion |
Rails Project |
| ✅ |
Routes: Go to Definition |
Rails Project |
| ✅ |
Split to Partial |
|
| ✅ |
Convert HTML/ERB to HAML |
html2haml gem |
| ✅ |
Snippets - HAML |
|
| ✅ |
Snippets - Rails |
|
| ✅ |
Live Preview |
Use HAML: Open Live Preview command |
| ✅ |
Wrap in Conditional |
|
| ✅ |
I18n Support |
Rails Project |
Linting
This extension utilizes the haml-lint and rubocop gems for linting HAML files.
To configure, create a .haml-lint.yml and .rubocop files in your project root. Check the default configuration.
To install the gem, add this to your Gemfile:
group :development, :test do
gem 'rubocop'
gem 'haml-lint', require: false
end
Features in Depth
Partials - Go to Definition
Navigate to a partial file by using CTRL + Click on the partial name or right-click and select Go to Definition.

Partials - Split to Partial
Easily extract content into a new partial. Select the content, click the Create a partial from selection option in the Code Actions menu (lightbulb icon), and you're done!

Wrap in Conditional
Quickly wrap selected HAML content in a conditional statement. Select any content, access the Code Actions menu (lightbulb icon), and choose Wrap in conditional. You'll be prompted to enter the condition (e.g., user.present?, @items.any?, etc.).
Example:
Before:
%div.user-info
%h2= @user.name
%p= @user.email
After wrapping in conditional with @user.present?:
- if @user.present?
%div.user-info
%h2= @user.name
%p= @user.email
Partial Completion
Autocomplete for partials based on the app/views directory in your project.

Data Attributes Completion
Smart autocompletion for HTML data attributes, with specific support for:
- HTML Common Attributes:
data-toggle, data-target, data-dismiss, etc.
- Rails UJS:
data-confirm, data-method, data-remote, data-disable-with, etc.
- Turbo Rails:
data-turbo, data-turbo-action, data-turbo-frame, data-turbo-stream, etc.
- Stimulus:
data-controller, data-action, data-target, etc.
Works with all HAML attribute syntaxes:
%div{data_confirm: "Are you sure?"}
%form(data_remote: true, data_turbo_action: "replace")
%button{:data_disable_with => "Processing..."}
Simply start typing data- in any attribute context and get intelligent suggestions with descriptions.
Convert HTML/ERB to HAML
Convert existing HTML or ERB files to HAML using html2haml.
Installation:
gem install html2haml
Usage:
- Open an HTML or ERB file.
- Open the Command Palette (
CTRL + SHIFT + P).
- Search for
HAML: Convert HTML to HAML and select it.
- Watch the magic happen!
Configuration
You can customize this extension by creating a .vscode/settings.json file in your project root:
{
"hamlAll.lintEnabled": true,
// Use 'bundle exec' to run haml-lint.
// (If true, the 'linterExecutablePath' setting is ignored.)
"hamlAll.useBundler": false,
// Specify the path to the haml-lint executable.
"hamlAll.linterExecutablePath": "haml-lint",
// I18n validation settings
"hamlAll.i18nValidation.enabled": true,
"hamlAll.i18nValidation.defaultLocale": "en"
}
I18n Configuration
The extension provides I18n validation and completion features for Rails projects. You can configure these settings:
hamlAll.i18nValidation.enabled (boolean, default: true): Enable/disable I18n validation diagnostics. Set to false if you have dynamic I18n keys or prefer other validation tools.
hamlAll.i18nValidation.defaultLocale (string, default: auto-detect): Set the default locale for I18n operations. If empty, the extension will auto-detect from Rails configuration or use common fallbacks (en, pt, pt-BR, es, fr).
Recommended Extensions
Enhance your experience with these complementary extensions:
- One Dark Dracula: A vibrant dark theme that pairs beautifully with this extension's syntax highlighting.
- Ruby LSP: Provides robust Ruby language support.
Acknowledgments
Special thanks to these extensions for inspiration and functionality:
License
This extension is released under the MIT License.