A practical line-numbering toolkit for BASIC in Visual Studio Code.
This extension provides fast and reliable commands to add, remove, and renumber line numbers — with automatic updates for branching statements like GOTO and GOSUB.
Features
Add line numbers to entire files or selections
Remove existing line numbers safely
Renumber lines with configurable start and step values
Automatically updates branch targets:
GOTO
GOSUB
THEN
ELSE
RUN
RESTORE
Smart Enter key behavior:
Inserts the next numbered line automatically
Shifts conflicting lines when necessary
Updates all affected jump targets
Preserves indentation (important for structured BASIC code)
Commands
Available via Command Palette (Ctrl+Shift+P / Cmd+Shift+P) or editor context menu:
BASIC: Add Line Numbers (or Selection)
BASIC: Remove Line Numbers (or Selection)
BASIC: Renumber Lines (or Selection)
Smart Enter Behavior
When editing a BASIC file:
Press Enter on a numbered line → inserts the next numbered line
If needed, subsequent lines are automatically shifted
All affected GOTO / GOSUB targets are updated
Special Case: Double Enter
Press Enter on an empty numbered line → removes the line number
Useful for creating visual spacing (unnumbered blocks)
Configuration
Customize behavior in VS Code settings:
Setting
Default
Description
basicLineNumber.start
100
Starting line number
basicLineNumber.step
10
Increment between lines
How It Works
Renumbering Logic
Detects existing line numbers
Builds a mapping of old → new numbers
Rewrites all affected lines
Updates branch instructions globally (even outside selection when needed)
Intelligent Block Handling
Multiple blank lines can act as separators
Prevents unintended renumbering across logical blocks
