<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2023 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy;
/**
* A Psy Shell configuration path helper.
*/
class ConfigPaths
{
private $configDir;
private $dataDir;
private $runtimeDir;
private $env;
/**
* ConfigPaths constructor.
*
* Optionally provide `configDir`, `dataDir` and `runtimeDir` overrides.
*
* @see self::overrideDirs
*
* @param string[] $overrides Directory overrides
* @param EnvInterface $env
*/
public function __construct(array $overrides = [], ?EnvInterface $env = null)
{
$this->overrideDirs($overrides);
$this->env = $env ?: (\PHP_SAPI === 'cli-server' ? new SystemEnv() : new SuperglobalsEnv());
}
/**
* Provide `configDir`, `dataDir` and `runtimeDir` overrides.
*
* If a key is set but empty, the override will be removed. If it is not set
* at all, any existing override will persist.
*
* @param string[] $overrides Directory overrides
*/
public function overrideDirs(array $overrides)
{
if (\array_key_exists('configDir', $overrides)) {
$this->configDir = $overrides['configDir'] ?: null;
}
if (\array_key_exists('dataDir', $overrides)) {
$this->dataDir = $overrides['dataDir'] ?: null;
}
if (\array_key_exists('runtimeDir', $overrides)) {
$this->runtimeDir = $overrides['runtimeDir'] ?: null;
}
}
/**
* Get the current home directory.
*
* @return string|null
*/
public function homeDir()
{
if ($homeDir = $this->getEnv('HOME') ?: $this->windowsHomeDir()) {
return \strtr($homeDir, '\\', '/');
}
return null;
}
private function windowsHomeDir()
{
if (\defined('PHP_WINDOWS_VERSION_MAJOR')) {
$homeDrive = $this->getEnv('HOMEDRIVE');
$homePath = $this->getEnv('HOMEPATH');
if ($homeDrive && $homePath) {
return $homeDrive.'/'.$homePath;
}
}
return null;
}
private function homeConfigDir()
{
if ($homeConfigDir = $this->getEnv('XDG_CONFIG_HOME')) {
return $homeConfigDir;
}
$homeDir = $this->homeDir();
return $homeDir === '/' ? $homeDir.'.config' : $homeDir.'/.config';
}
/**
* Get potential config directory paths.
*
* Returns `~/.psysh`, `%APPDATA%/PsySH` (when on Windows), and all
* XDG Base Directory config directories:
*
* http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
*
* @return string[]
*/
public function configDirs(): array
{
if ($this->configDir !== null) {
return [$this->configDir];
}
$configDirs = $this->getEnvArray('XDG_CONFIG_DIRS') ?: ['/etc/xdg'];
return $this->allDirNames(\array_merge([$this->homeConfigDir()], $configDirs));
}
/**
* Get the current home config directory.
*
* Returns the highest precedence home config directory which actually
* exists. If none of them exists, returns the highest precedence home
* config directory (`%APPDATA%/PsySH` on Windows, `~/.config/psysh`
* everywhere else).
*
* @see self::homeConfigDir
*/
public function currentConfigDir(): string
{
if ($this->configDir !== null) {
return $this->configDir;
}
$configDirs = $this->allDirNames([$this->homeConfigDir()]);
foreach ($configDirs as $configDir) {
if (@\is_dir($configDir)) {
return $configDir;
}
}
return $configDirs[0];
}
/**
* Find real config files in config directories.
*
* @param string[] $names Config file names
*
* @return string[]
*/
public function configFiles(array $names): array
{
return $this->allRealFiles($this->configDirs(), $names);
}
/**
* Get potential data directory paths.
*
* If a `dataDir` option was explicitly set, returns an array containing
* just that directory.
*
* Otherwise, it returns `~/.psysh` and all XDG Base Directory data directories:
*
* http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
*
* @return string[]
*/
public function dataDirs(): array
{
if ($this->dataDir !== null) {
return [$this->dataDir];
}
$homeDataDir = $this->getEnv('XDG_DATA_HOME') ?: $this->homeDir().'/.local/share';
$dataDirs = $this->getEnvArray('XDG_DATA_DIRS') ?: ['/usr/local/share', '/usr/share'];
return $this->allDirNames(\array_merge([$homeDataDir], $dataDirs));
}
/**
* Find real data files in config directories.
*
* @param string[] $names Config file names
*
* @return string[]
*/
public function dataFiles(array $names): array
{
return $this->allRealFiles($this->dataDirs(), $names);
}
/**
* Get a runtime directory.
*
* Defaults to `/psysh` inside the system's temp dir.
*/
public function runtimeDir(): string
{
if ($this->runtimeDir !== null) {
return $this->runtimeDir;
}
// Fallback to a boring old folder in the system temp dir.
$runtimeDir = $this->getEnv('XDG_RUNTIME_DIR') ?: \sys_get_temp_dir();
return \strtr($runtimeDir, '\\', '/').'/psysh';
}
/**
* Get a list of directories in PATH.
*
* If $PATH is unset/empty it defaults to '/usr/sbin:/usr/bin:/sbin:/bin'.
*
* @return string[]
*/
public function pathDirs(): array
{
return $this->getEnvArray('PATH') ?: ['/usr/sbin', '/usr/bin', '/sbin', '/bin'];
}
/**
* Locate a command (an executable) in $PATH.
*
* Behaves like 'command -v COMMAND' or 'which COMMAND'.
* If $PATH is unset/empty it defaults to '/usr/sbin:/usr/bin:/sbin:/bin'.
*
* @param string $command the executable to locate
*
* @return string
*/
public function which($command)
{
foreach ($this->pathDirs() as $path) {
$fullpath = $path.\DIRECTORY_SEPARATOR.$command;
if (@\is_file($fullpath) && @\is_executable($fullpath)) {
return $fullpath;
}
}
return null;
}
/**
* Get all PsySH directory name candidates given a list of base directories.
*
* This expects that XDG-compatible directory paths will be passed in.
* `psysh` will be added to each of $baseDirs, and we'll throw in `~/.psysh`
* and a couple of Windows-friendly paths as well.
*
* @param string[] $baseDirs base directory paths
*
* @return string[]
*/
private function allDirNames(array $baseDirs): array
{
$dirs = \array_map(function ($dir) {
return \strtr($dir, '\\', '/').'/psysh';
}, $baseDirs);
// Add ~/.psysh
if ($home = $this->getEnv('HOME')) {
$dirs[] = \strtr($home, '\\', '/').'/.psysh';
}
// Add some Windows specific ones :)
if (\defined('PHP_WINDOWS_VERSION_MAJOR')) {
if ($appData = $this->getEnv('APPDATA')) {
// AppData gets preference
\array_unshift($dirs, \strtr($appData, '\\', '/').'/PsySH');
}
if ($windowsHomeDir = $this->windowsHomeDir()) {
$dir = \strtr($windowsHomeDir, '\\', '/').'/.psysh';
if (!\in_array($dir, $dirs)) {
$dirs[] = $dir;
}
}
}
return $dirs;
}
/**
* Given a list of directories, and a list of filenames, find the ones that
* are real files.
*
* @return string[]
*/
private function allRealFiles(array $dirNames, array $fileNames): array
{
$files = [];
foreach ($dirNames as $dir) {
foreach ($fileNames as $name) {
$file = $dir.'/'.$name;
if (@\is_file($file)) {
$files[] = $file;
}
}
}
return $files;
}
/**
* Ensure that $dir exists and is writable.
*
* Generates E_USER_NOTICE error if the directory is not writable or creatable.
*
* @param string $dir
*
* @return bool False if directory exists but is not writeable, or cannot be created
*/
public static function ensureDir(string $dir): bool
{
if (!\is_dir($dir)) {
// Just try making it and see if it works
@\mkdir($dir, 0700, true);
}
if (!\is_dir($dir) || !\is_writable($dir)) {
\trigger_error(\sprintf('Writing to directory %s is not allowed.', $dir), \E_USER_NOTICE);
return false;
}
return true;
}
/**
* Ensure that $file exists and is writable, make the parent directory if necessary.
*
* Generates E_USER_NOTICE error if either $file or its directory is not writable.
*
* @param string $file
*
* @return string|false Full path to $file, or false if file is not writable
*/
public static function touchFileWithMkdir(string $file)
{
if (\file_exists($file)) {
if (\is_writable($file)) {
return $file;
}
\trigger_error(\sprintf('Writing to %s is not allowed.', $file), \E_USER_NOTICE);
return false;
}
if (!self::ensureDir(\dirname($file))) {
return false;
}
\touch($file);
return $file;
}
private function getEnv($key)
{
return $this->env->get($key);
}
private function getEnvArray($key)
{
if ($value = $this->getEnv($key)) {
return \explode(\PATH_SEPARATOR, $value);
}
return null;
}
}
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