Line King

Line King sorts, changes case, removes dups, removes blank lines, splits and joins lines, encodes to Base64, etc. It's the ultimate toolbox for line / text manipulation. It's also smart, only displaying what is relevant to what is selected.

The best line manipulation extension for VS Code ever? Many people are saying so.

Features

Sorting

Works on selection or entire document.

• Sort Ascending/Descending - Standard alphabetical sort (case-sensitive or case-insensitive)
• Natural Sort - Intelligently sorts numbers (e.g., A2 comes before A10)
• Sort by Length - Organize lines by their character count (shortest or longest first)
• Ignore Special Characters - Sorts ignoring leading special characters
• Reverse - Reverses the order of lines
• IP Address Sort - Sorts lines containing IPv4 addresses numerically
• Shuffle - Randomize line order
• CSS Properties Sort - Sorts CSS/SCSS/LESS properties alphabetically or by length within rule blocks
• JSON Sort - Sorts JSON by keys or values

Tidying & Cleaning

• Remove Blank Lines - Deletes all empty lines
• Condense Blank Lines - Reduces multiple consecutive blank lines to just one
• Remove Duplicates - Keeps the first occurrence, removes the rest (preserves order)
• Keep Only Duplicates - Useful for finding repeated data; removes all unique lines
• Trim Whitespace - Remove leading, trailing, or both from each line

Text Transformation

• Case Conversion:

  • UPPERCASE
  • lowercase
  • Sentence case
  • Title Case
  • camelCase
  • PascalCase
  • kebab-case
  • snake_case

• Encoding/Decoding:

  • URL Encode/Decode
  • Base64 Encode/Decode
  • JSON String Escape/Unescape
  • JSON Minify

Utilities

• Duplicate Line/Selection - Smarter duplication that handles newlines correctly
• Join Lines - Combines selected lines using a configurable separator
• Split Selection - Splits text based on a custom separator you specify
• Align to Separator - Aligns text around a separator (e.g., =, :, ,)
• Insert Numeric Sequence - Replaces selection with sequential numbers (1, 2, 3...)
• Show Whitespace Characters - Display line endings LF (↓), CRLF (↵), spaces (·), and tabs (→)
• Convert Line Endings - Convert between LF (Unix) and CRLF (Windows) formats
• Cleanup on Save - Automatically tidy files when you save

Usage

Context Menu

1. Select text or place cursor in the document
2. Right-click to open the context menu
3. Look for the Line King submenu
4. Choose your desired operation

Command Palette

1. Press Ctrl+Shift+P (Windows/Linux) or Cmd+Shift+P (Mac)
2. Type "Line King" to see all available commands
3. Select the command you want to run

Behavior

• Line Operations (Sort, Tidy, Join, Align):

  • With selection: Automatically expands selection to encompass the full lines.
  • Without selection: Operates on the entire document.

• Text Operations (Case, Encode, Transform):

  • With selection: Operates strictly on the selected text characters.
  • Without selection: Operates on the entire document.

• Multiple selections: All commands handle multiple cursors/selections intelligently.

Configuration

Access settings via: File > Preferences > Settings > Extensions > Line King

Setting	Description	Default
lineKing.joinSeparator	Character or string used when joining lines together.	" " (Space)
lineKing.cleanupOnSave	Action to run on save: none, removeBlankLines, trimTrailingWhitespace, or sortCssProperties.	none
lineKing.cssSortStrategy	Strategy for CSS sorting: alphabetical (by property name) or length (by line length).	alphabetical

Example Configuration

{
    "lineKing.joinSeparator": ", ",
    "lineKing.cleanupOnSave": "trimTrailingWhitespace",
    "lineKing.cssSortStrategy": "alphabetical"
}

Commands

All commands are available through the Command Palette (Ctrl+Shift+P / Cmd+Shift+P):

Sort Commands

Ascending:

• Line King: Sort: Ascending
• Line King: Sort: Ascending (Case Insensitive)
• Line King: Sort: Ascending (Natural)
• Line King: Sort: Ascending (Ignore Special)
• Line King: Sort: Ascending (Ignore Special, Case Insensitive)
• Line King: Sort: Ascending (By Length)

Descending:

• Line King: Sort: Descending
• Line King: Sort: Descending (Case Insensitive)
• Line King: Sort: Descending (Natural)
• Line King: Sort: Descending (Ignore Special)
• Line King: Sort: Descending (Ignore Special, Case Insensitive)
• Line King: Sort: Descending (By Length)

Other:

• Line King: Sort: Reverse
• Line King: Sort: By IP Address
• Line King: Sort: Shuffle
• Line King: Sort: CSS Properties
• Line King: Sort: JSON by Key
• Line King: Sort: JSON by Value

Tidy Commands

• Line King: Tidy: Remove Blank Lines
• Line King: Tidy: Condense Blank Lines
• Line King: Tidy: Remove Duplicate Lines
• Line King: Tidy: Keep Only Duplicates
• Line King: Tidy: Trim Trailing Whitespace
• Line King: Tidy: Trim Leading Whitespace
• Line King: Tidy: Trim Both Ends

Case Commands

• Line King: Case: UPPERCASE
• Line King: Case: lowercase
• Line King: Case: Sentence case
• Line King: Case: Title Case
• Line King: Case: camelCase
• Line King: Case: PascalCase
• Line King: Case: kebab-case
• Line King: Case: snake_case

Dev Tools Commands

• Line King: Dev: URL Encode
• Line King: Dev: URL Decode
• Line King: Dev: Base64 Encode
• Line King: Dev: Base64 Decode
• Line King: Dev: JSON String Escape
• Line King: Dev: JSON String Unescape
• Line King: Dev: Minify JSON

Tools Commands

• Line King: Tools: Duplicate Selection
• Line King: Tools: Join Lines
• Line King: Tools: Split Selection...
• Line King: Tools: Align to Separator...
• Line King: Tools: Insert Numeric Sequence (1,2,3...)

Util Commands

• Line King: Util: Show Whitespace Characters
• Line King: Util: Hide Whitespace Characters
• Line King: Util: Convert to LF (Unix)
• Line King: Util: Convert to CRLF (Windows)

Examples

Sorting a List

Before:

Zebra
Apple
banana
Cherry

After (Ascending, Case Insensitive):

Apple
banana
Cherry
Zebra

Sorting CSS Properties

Before:

.container {
    z-index: 10;
    background-color: white;
    padding: 20px;
    margin: 0 auto;
    display: flex;
}

After:

.container {
    background-color: white;
    display: flex;
    margin: 0 auto;
    padding: 20px;
    z-index: 10;
}

Aligning to Separator

Before:

name = "John"
age = 30
email = "john@example.com"

After (Align to =):

name  = John
age   = 30
email = john@example.com

Requirements

• Visual Studio Code v1.109+
• No additional dependencies required

Extension Compatibility

Line King is designed to work in:

• ✅ Local VS Code
• ✅ VS Code Web (browser)
• ✅ Virtual Workspaces
• ✅ Untrusted Workspaces

Performance Benchmarks

Line King is optimized for fast startup with lazy initialization. Benchmark metrics track extension activation time to ensure performance remains optimal.

Running Benchmarks Locally

# Run startup benchmark
bun run benchmark

This will:

• Compile the extension
• Run VS Code extension host
• Measure activation timing across multiple runs
• Display aggregated results with statistics
• Compare against baseline if available

Benchmark Metrics

The following metrics are tracked during extension activation:

Metric	Description
Logger Init	Time to initialize logging system
Commands Registered	Time to register all commands
Save Handler Registered	Time to register document save handler
Context Deferred	Time to defer context manager initialization
Total	Complete extension activation time

CI Benchmarking

Benchmarks run automatically on:

• Push to main or develop branches
• Pull requests to main or develop

Results are posted as comments on PRs to track performance changes.

Support

Please report issues and feature requests to Line King issues.

License

MIT.