// Copyright (c) Microsoft Corporation. All rights reserved.

// Licensed under the MIT License.

import * as fsapi from 'fs-extra';

import * as path from 'path';

import { getPathEnvironmentVariable } from '../../common/utils/platform';

/**

* Checks if a given path ends with python*.exe

* @param {string} interpreterPath : Path to python interpreter.

* @returns {boolean} : Returns true if the path matches pattern for windows python executable.

*/

export function isPosixPythonBin(interpreterPath:string): boolean {

/**

* This Reg-ex matches following file names:

* python

* python3

* python38

* python3.8

*/

const posixPythonBinPattern = /^python(\d+(\.\d+)?)?$/;

return posixPythonBinPattern.test(path.basename(interpreterPath));

}

export async function commonPosixBinPaths(): Promise<string[]> {

const searchPaths = (getPathEnvironmentVariable() || '')

.split(path.delimiter)

.filter((p) => p.length > 0);

const paths: string[] = Array.from(new Set(

[

'/bin',

'/etc',

'/lib',

'/lib/x86_64-linux-gnu',

'/lib64',

'/sbin',

'/snap/bin',

'/usr/bin',

'/usr/games',

'/usr/include',

'/usr/lib',

'/usr/lib/x86_64-linux-gnu',

'/usr/lib64',

'/usr/libexec',

'/usr/local',

'/usr/local/bin',

'/usr/local/etc',

'/usr/local/games',

'/usr/local/lib',

'/usr/local/sbin',

'/usr/sbin',

'/usr/share',

'~/.local/bin',

].concat(searchPaths),

));

const exists = await Promise.all(paths.map((p) => fsapi.pathExists(p)));

return paths.filter((_, index) => exists[index]);

}