Julia Cell Highlighter

A VS Code extension that highlights the current Julia code cell in .jl files and adds optional CodeLens actions to run cells.

Theme: Shakira Warm Spectrum, Font: Maple Mono, Delimiter line bolding: Highlight

Quick Start

1. Install from the VS Code Marketplace.
2. Open a .jl file and add cell delimiters like:

## Cell 1
x = 1

## Cell 2
x + 1

The current cell is highlighted automatically as you move the cursor.

What Counts as a Cell

The delimiter rules are aligned with the Julia extension:

• If julia.cellDelimiters is set, it is used.
• Otherwise the built-in defaults are used: ##, #%%, # %%.

You can enable/disable which built-ins are active via juliaCellHighlighter.defaultDelimiters.

By default, the delimiter line is included in the highlighted range. When the cursor is on a delimiter line, the next cell is highlighted (if the delimiter is the last line, nothing is highlighted).

CodeLens (Run Cell)

When enabled, CodeLens buttons appear above delimiter lines:

• Run Cell
• Run Cell and Move (executes, then moves to the next cell after a short delay)

The commands call the Julia extension's cell execution, so the execution behavior matches Julia's rules.

Separator Lines (Independent)

You can show a visual separator line above delimiters even when highlighting is turned off.

• Controlled by juliaCellHighlighter.showDelimiterSeparator
• Uses its own delimiter list via juliaCellHighlighter.separatorDelimiters

Excluding Files or Folders

Exclude paths from cell highlighting and CodeLens (separator lines still apply):

"juliaCellHighlighter.excludePatterns": [
  "**/src/**",
  "**/test/**",
  "**/deps/**",
  "**/docs/**"
]

Settings

• juliaCellHighlighter.enabled: Enable/disable highlighting (default: true)
• juliaCellHighlighter.codeLensMode: CodeLens display mode (always, current, never, default: always)
• juliaCellHighlighter.backgroundColor: Background color (default: rgba(100, 150, 255, 0.06))
• juliaCellHighlighter.borderColor: Top/bottom border color (default: rgba(100, 150, 255, 0.6))
• juliaCellHighlighter.topBorderWidth: Top border width (default: 2px)
• juliaCellHighlighter.bottomBorderWidth: Bottom border width (default: 1px)
• juliaCellHighlighter.showDelimiterSeparator: Show separator line above delimiters (default: true)
• juliaCellHighlighter.delimiterSeparatorColor: Separator color (default: #ffffff)
• juliaCellHighlighter.delimiterSeparatorWidth: Separator width (default: 1px)
• juliaCellHighlighter.separatorDelimiters: Regex list for separator lines (default: ^##(?!#), ^#%%, ^#\s+%%)
• juliaCellHighlighter.excludePatterns: Glob patterns to exclude from cell highlighting/CodeLens (default: **/src/**, **/test/**, **/deps/**, **/docs/**)
• juliaCellHighlighter.includeDelimiterLine: Include delimiter line in highlight (default: true)
• juliaCellHighlighter.highlightWhenNoDelimiter: Behavior when no delimiters exist (none or file, default: none)
• juliaCellHighlighter.cursorOnDelimiterBehavior: When cursor is on delimiter (next, previous, none, default: next)
• juliaCellHighlighter.defaultDelimiters: Enabled built-in delimiters (##, #%%, # %%)
• juliaCellHighlighter.multiCursorMode: Multi-cursor behavior (primary, union, first, default: primary)

Keybindings

• Toggle highlighting: Ctrl+Shift+H (Windows/Linux) / Cmd+Shift+H (macOS)

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