54 lines
1.6 KiB
TypeScript
54 lines
1.6 KiB
TypeScript
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import { dirname, relative } from "node:path";
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/**
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* Calculate directory distance between a rule file and current file.
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* Distance is based on common ancestor within project root.
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*
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* @param rulePath - Path to the rule file
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* @param currentFile - Path to the current file being edited
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* @param projectRoot - Project root for relative path calculation
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* @returns Distance (0 = same directory, higher = further)
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*/
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export function calculateDistance(
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rulePath: string,
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currentFile: string,
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projectRoot: string | null,
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): number {
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if (!projectRoot) {
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return 9999;
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}
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try {
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const ruleDir = dirname(rulePath);
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const currentDir = dirname(currentFile);
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const ruleRel = relative(projectRoot, ruleDir);
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const currentRel = relative(projectRoot, currentDir);
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// Handle paths outside project root
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if (ruleRel.startsWith("..") || currentRel.startsWith("..")) {
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return 9999;
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}
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// Split by both forward and back slashes for cross-platform compatibility
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// path.relative() returns OS-native separators (backslashes on Windows)
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const ruleParts = ruleRel ? ruleRel.split(/[/\\]/) : [];
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const currentParts = currentRel ? currentRel.split(/[/\\]/) : [];
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// Find common prefix length
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let common = 0;
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for (let i = 0; i < Math.min(ruleParts.length, currentParts.length); i++) {
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if (ruleParts[i] === currentParts[i]) {
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common++;
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} else {
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break;
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}
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}
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// Distance is how many directories up from current file to common ancestor
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return currentParts.length - common;
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} catch {
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return 9999;
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}
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}
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