import { Rule } from './rule-interface';
/**
* MD007: Unordered list indentation
*
* This rule is triggered when unordered list items are not properly indented.
* By default, this rule enforces a 2-space indentation for nested lists.
*/
export const name = 'MD007';
export const description = 'Unordered list indentation';
/**
* Fix unordered list indentation by standardizing to 2 spaces per level
* @param lines Array of string lines to fix
* @returns Fixed lines array with proper list indentation
*/
export function fix(lines: string[]): string[] {
const indentationAmount = 2; // Standard indentation (2 spaces)
const unorderedListItemRegex = /^(\s*)([*+-])\s+(.*)$/;
// Track list nesting levels
let nestingStack: number[] = [];
let currentLevel = 0;
return lines.map(line => {
const match = line.match(unorderedListItemRegex);
if (!match) {
// If we hit a non-list line, reset tracking
if (line.trim() === '' || !line.trim().startsWith(' ')) {
nestingStack.length = 0;
currentLevel = 0;
}
return line;
}
const indentation = match[1].length;
const marker = match[2];
const content = match[3];
// Determine nesting level based on indentation
if (indentation === 0) {
// Top-level list item
nestingStack = [];
currentLevel = 0;
} else if (nestingStack.length === 0 || indentation > nestingStack[nestingStack.length - 1]) {
// New nested level
nestingStack.push(indentation);
currentLevel++;
} else if (indentation < nestingStack[nestingStack.length - 1]) {
// Moving back up in nesting levels
while (nestingStack.length > 0 && indentation < nestingStack[nestingStack.length - 1]) {
nestingStack.pop();
currentLevel--;
}
}
// Calculate correct indentation for this level
const correctIndentation = ' '.repeat(currentLevel * indentationAmount);
// Return fixed line with correct indentation
return `${correctIndentation}${marker} ${content}`;
});
}
/**
* Rule implementation for MD007
*/
export const rule: Rule = {
name,
description,
fix
};
export default rule;
