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.

Line King screenshot

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

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

Command Palette

Press Ctrl+Shift+P (Windows/Linux) or Cmd+Shift+P (Mac)
Type "Line King" to see all available commands
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.

Line King

dcog989

Line King

Features

Sorting

Tidying & Cleaning

Text Transformation

Utilities

Usage

Context Menu

Command Palette

Behavior

Configuration

Example Configuration

Commands

Sort Commands

Tidy Commands

Case Commands

Dev Tools Commands

Tools Commands

Util Commands

Examples

Sorting a List

Sorting CSS Properties

Aligning to Separator

Requirements

Extension Compatibility

Performance Benchmarks

Running Benchmarks Locally

Benchmark Metrics

CI Benchmarking

Support

License