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Overview

Glass features a powerful code editor built on a custom rendering engine designed for performance and extensibility. The editor supports all modern code editing workflows with features like multiple cursors, syntax-aware navigation, and intelligent text manipulation.

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Multiple Cursors

Glass supports sophisticated multi-cursor editing for efficient text manipulation across multiple locations simultaneously.

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Adding Cursors

1

Add cursor above

Use AddSelectionAbove to add a new cursor on the line above the current position
2

Add cursor below

Use AddSelectionBelow to add a new cursor on the line below the current position
3

Select next occurrence

Use SelectNext to select the next occurrence of the current selection
4

Select all occurrences

Use SelectAllMatches to instantly select all occurrences of the current selection

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Multi-Cursor Features

  • Columnar Selection: Create vertical selections with BeginColumnar mode
  • Skip Soft Wrap: Configure whether cursors skip soft-wrapped lines
  • Multi-Cursor Modifier: Customize modifier keys (Alt or Cmd/Ctrl) for multi-cursor operations
// From crates/editor/src/actions.rs
pub struct AddSelectionAbove {
    pub skip_soft_wrap: bool,
}

pub struct SelectNext {
    pub replace_newest: bool,
}

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Find and Replace

Powerful search and replace capabilities integrated directly into the editor.
  • FindNextMatch: Navigate to the next search match
  • FindPreviousMatch: Navigate to the previous search match
  • FindAllReferences: Find all references to a symbol across the project

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Selection and Navigation

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Smart Selection

The editor provides syntax-aware selection commands:
  • SelectLargerSyntaxNode: Expand selection to encompassing syntax node
  • SelectSmallerSyntaxNode: Contract selection to smaller syntax node
  • SelectNextSyntaxNode: Move to next sibling syntax node
  • SelectPreviousSyntaxNode: Move to previous sibling syntax node
  • SelectEnclosingSymbol: Select the entire enclosing symbol

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Movement Commands

Line Navigation

  • MoveLineUp / MoveLineDown: Move entire lines
  • MoveToBeginningOfLine / MoveToEndOfLine: Jump to line boundaries
  • MovePageUp / MovePageDown: Navigate by pages

Word Navigation

  • MoveToNextWordEnd / MoveToPreviousWordStart: Jump by words
  • MoveToNextSubwordEnd / MoveToPreviousSubwordStart: Jump by camelCase/snake_case parts

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Code Manipulation

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Line Operations

// Available line manipulation actions
- DuplicateLineDown / DuplicateLineUp
- DeleteLine
- JoinLines
- ReverseLines
- SortLinesCaseSensitive / SortLinesCaseInsensitive
- SortLinesByLength
- ShuffleLines
- UniqueLinesCaseSensitive / UniqueLinesCaseInsensitive

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Text Transformation

Convert selected text between various cases:

Case Styles

  • ConvertToUpperCase
  • ConvertToLowerCase
  • ConvertToTitleCase
  • ConvertToSentenceCase

Programming Cases

  • ConvertToUpperCamelCase
  • ConvertToLowerCamelCase
  • ConvertToSnakeCase
  • ConvertToKebabCase

Other

  • ConvertToOppositeCase
  • ConvertToRot13
  • ConvertToRot47

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Code Actions

  • ToggleCodeActions: Display available code actions at cursor
  • ConfirmCodeAction: Apply selected code action
  • Format: Format (entire document) or FormatSelections (selected text only)
  • Organize Imports: OrganizeImports

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Folding and Visibility

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Code Folding

Manage code visibility with powerful folding commands:
  • Fold / Unfold: Toggle folding at cursor
  • FoldAll / UnfoldAll: Fold/unfold all foldable regions
  • FoldRecursive / UnfoldRecursive: Recursive folding operations
  • FoldFunctionBodies: Fold all function bodies for overview
  • FoldAtLevel1 through FoldAtLevel9: Fold at specific indentation levels

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Excerpts

Work with code excerpts in multibuffer views:
  • ExpandExcerpts: Expand all excerpts by specified lines
  • ExpandExcerptsUp / ExpandExcerptsDown: Expand in specific directions
  • OpenExcerpts / OpenExcerptsSplit: Open excerpts in new or split view

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Editor Display

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Visual Enhancements

  • ToggleIndentGuides: Show/hide indentation guides
  • ToggleInlayHints: Display inline type hints and parameter names
  • ToggleInlineValues: Show variable values during debugging

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Minimap

  • ToggleMinimap: Show/hide the code minimap for navigation
  • Configurable minimap settings in EditorSettings
The minimap uses a specialized MINIMAP_FONT_SIZE of 2 pixels for rendering efficiency.

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Git Integration

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Diff Viewing

  • ExpandAllDiffHunks / CollapseAllDiffHunks: Manage diff visibility
  • ToggleSelectedDiffHunks: Toggle specific diff hunks
  • GoToHunk / GoToPreviousHunk: Navigate between changes
  • ApplyDiffHunk / ApplyAllDiffHunks: Apply changes from diffs

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Git Blame

  • ToggleGitBlameInline: Display git blame information inline
  • BlameHover: Show blame info on hover
  • OpenGitBlameCommit: Open the full commit for current blame

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Advanced Features

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Snippets

// Insert snippet from configuration
pub struct InsertSnippet {
    pub language: Option<String>,
    pub name: Option<String>,
    pub snippet: Option<String>,
}
  • Insert predefined code snippets
  • Navigate snippet tabstops with NextSnippetTabstop / PreviousSnippetTabstop
  • Language-specific snippet support
Navigate code structure with breadcrumb navigation showing current symbol context.
  • OpenUrl: Open URLs at cursor position
  • OpenSelectedFilename: Open file paths in selection
  • CopyPermalinkToLine: Copy shareable link to current line
  • OpenPermalinkToLine: Open permalink in browser

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Language Server Integration

Navigation

  • GoToDefinition / GoToDefinitionSplit
  • GoToDeclaration / GoToDeclarationSplit
  • GoToImplementation / GoToImplementationSplit
  • GoToTypeDefinition / GoToTypeDefinitionSplit

Information

  • Hover: Show symbol information
  • ShowSignatureHelp: Display function signatures
  • ShowCompletions: Trigger code completion
  • Rename: Rename symbol across project
Language server features require a compatible language server to be installed and configured for your language.

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Performance

The editor is optimized for performance:
  • Custom rendering engine with efficient text layout
  • Display map system for handling folds, wraps, and inlays efficiently
  • Debounced operations (code actions: 250ms, selection highlight: 100ms)
  • Configurable timeouts for LSP operations
// From crates/editor/src/editor.rs
const CODE_ACTIONS_DEBOUNCE_TIMEOUT: Duration = Duration::from_millis(250);
const SELECTION_HIGHLIGHT_DEBOUNCE_TIMEOUT: Duration = Duration::from_millis(100);
const CODE_ACTION_TIMEOUT: Duration = Duration::from_secs(5);

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