103 lines
3.5 KiB
TypeScript
103 lines
3.5 KiB
TypeScript
/**
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* @license
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* Copyright 2025 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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import path from 'node:path'; // Import the 'path' module
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/**
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* Shortens a path string if it exceeds maxLen, prioritizing the start and end segments.
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* Example: /path/to/a/very/long/file.txt -> /path/.../long/file.txt
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*/
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export function shortenPath(filePath: string, maxLen: number = 35): string {
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if (filePath.length <= maxLen) {
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return filePath;
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}
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const parsedPath = path.parse(filePath);
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const root = parsedPath.root;
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const separator = path.sep;
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// Get segments of the path *after* the root
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const relativePath = filePath.substring(root.length);
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const segments = relativePath.split(separator).filter((s) => s !== ''); // Filter out empty segments
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// Handle cases with no segments after root (e.g., "/", "C:\") or only one segment
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if (segments.length <= 1) {
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// Fallback to simple start/end truncation for very short paths or single segments
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const keepLen = Math.floor((maxLen - 3) / 2);
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// Ensure keepLen is not negative if maxLen is very small
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if (keepLen <= 0) {
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return filePath.substring(0, maxLen - 3) + '...';
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}
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const start = filePath.substring(0, keepLen);
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const end = filePath.substring(filePath.length - keepLen);
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return `${start}...${end}`;
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}
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const firstDir = segments[0];
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const startComponent = root + firstDir;
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const endPartSegments: string[] = [];
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// Base length: startComponent + separator + "..."
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let currentLength = startComponent.length + separator.length + 3;
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// Iterate backwards through segments (excluding the first one)
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for (let i = segments.length - 1; i >= 1; i--) {
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const segment = segments[i];
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// Length needed if we add this segment: current + separator + segment
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const lengthWithSegment = currentLength + separator.length + segment.length;
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if (lengthWithSegment <= maxLen) {
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endPartSegments.unshift(segment); // Add to the beginning of the end part
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currentLength = lengthWithSegment;
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} else {
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// Adding this segment would exceed maxLen
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break;
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}
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}
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// Construct the final path
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let result = startComponent + separator + '...';
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if (endPartSegments.length > 0) {
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result += separator + endPartSegments.join(separator);
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}
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// As a final check, if the result is somehow still too long (e.g., startComponent + ... is too long)
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// fallback to simple truncation of the original path
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if (result.length > maxLen) {
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const keepLen = Math.floor((maxLen - 3) / 2);
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if (keepLen <= 0) {
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return filePath.substring(0, maxLen - 3) + '...';
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}
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const start = filePath.substring(0, keepLen);
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const end = filePath.substring(filePath.length - keepLen);
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return `${start}...${end}`;
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}
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return result;
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}
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/**
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* Calculates the relative path from a root directory to a target path.
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* Ensures both paths are resolved before calculating.
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* Returns '.' if the target path is the same as the root directory.
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*
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* @param targetPath The absolute or relative path to make relative.
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* @param rootDirectory The absolute path of the directory to make the target path relative to.
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* @returns The relative path from rootDirectory to targetPath.
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*/
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export function makeRelative(
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targetPath: string,
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rootDirectory: string,
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): string {
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const resolvedTargetPath = path.resolve(targetPath);
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const resolvedRootDirectory = path.resolve(rootDirectory);
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const relativePath = path.relative(resolvedRootDirectory, resolvedTargetPath);
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// If the paths are the same, path.relative returns '', return '.' instead
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return relativePath || '.';
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}
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