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