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use std::path::{Path, PathBuf};
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Platform {
Unix,
Windows,
}
impl Default for Platform {
fn default() -> Self {
Platform::Unix
}
}
impl Platform {
/// Detect the host platform from the initial_cwd string.
/// Checks for drive letter (e.g. `C:\` or `C:/`) or UNC path (`\\server\`).
pub fn detect(initial_cwd: &str) -> Self {
let bytes = initial_cwd.as_bytes();
// Drive letter: X:\ or X:/
let is_drive_letter = matches!(
(bytes.get(0), bytes.get(1), bytes.get(2)),
(Some(c), Some(b':'), Some(b'\\' | b'/')) if c.is_ascii_alphabetic()
);
if is_drive_letter {
return Platform::Windows;
}
// UNC path: \\server\share
let is_unc_path = matches!((bytes.get(0), bytes.get(1)), (Some(b'\\'), Some(b'\\')));
if is_unc_path {
return Platform::Windows;
}
Platform::Unix
}
/// Replace `\` with `/` so WASM PathBuf can parse the path correctly.
/// No-op for paths that don't contain backslashes.
pub fn normalize(path: &Path) -> PathBuf {
let s = path.to_string_lossy();
if s.contains('\\') {
PathBuf::from(s.replace('\\', "/"))
} else {
path.to_path_buf()
}
}
/// Convert internal forward-slash path back to native backslashes for Windows display.
/// Identity on Unix.
pub fn to_host_display(path: &Path, platform: Platform) -> String {
let s = path.to_string_lossy();
match platform {
Platform::Windows => s.replace('/', "\\"),
Platform::Unix => s.into_owned(),
}
}
/// Path separator character for the host platform.
pub fn separator(self) -> char {
match self {
Platform::Windows => '\\',
Platform::Unix => '/',
}
}
/// Ensure bare drive letters like `C:` become `C:/`.
/// WASM PathBuf's `parent()` strips the trailing slash, but on Windows
/// `C:` means "current directory on drive C", not the drive root.
pub fn ensure_drive_root(path: PathBuf, platform: Platform) -> PathBuf {
if platform == Platform::Windows {
let s = path.to_string_lossy();
let bytes = s.as_bytes();
let is_bare_drive = s.len() == 2
&& matches!(bytes.get(0), Some(c) if c.is_ascii_alphabetic())
&& matches!(bytes.get(1), Some(b':'));
if is_bare_drive {
return PathBuf::from(format!("{}/", s));
}
}
path
}
/// Display name for a virtual root entry.
/// `C:/` → `C:\`, `//wsl.localhost/Ubuntu/` → `Ubuntu (WSL)`, `/` → `/`.
pub fn virtual_root_display_name(path: &Path, platform: Platform) -> String {
let s = path.to_string_lossy();
match platform {
Platform::Windows => {
if s.starts_with("//wsl.localhost/") {
let rest = &s["//wsl.localhost/".len()..];
let distro = rest.trim_end_matches('/');
return format!("{} (WSL)", distro);
}
Platform::to_host_display(path, platform)
},
Platform::Unix => s.into_owned(),
}
}
/// Check if a path is a filesystem root.
/// Unix: `/` or empty.
/// Windows: `X:/` or `X:` (drive root), or `//server/share` (UNC root with <= 4 components).
pub fn is_root(path: &Path, platform: Platform) -> bool {
let s = path.to_string_lossy();
match platform {
Platform::Unix => s == "/" || s.is_empty(),
Platform::Windows => {
let bytes = s.as_bytes();
// Drive root: "C:/" or "C:"
let is_drive_root_slash = s.len() == 3
&& matches!(bytes.get(0), Some(c) if c.is_ascii_alphabetic())
&& matches!(bytes.get(1), Some(b':'))
&& matches!(bytes.get(2), Some(b'/'));
if is_drive_root_slash {
return true;
}
let is_bare_drive = s.len() == 2
&& matches!(bytes.get(0), Some(c) if c.is_ascii_alphabetic())
&& matches!(bytes.get(1), Some(b':'));
if is_bare_drive {
return true;
}
// UNC root: //server/share (at most 4 path components)
if s.starts_with("//") {
let without_prefix = &s[2..];
let parts: Vec<&str> = without_prefix
.split('/')
.filter(|p| !p.is_empty())
.collect();
return parts.len() <= 2;
}
s.is_empty()
},
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn detect_unix() {
assert_eq!(Platform::detect("/home/user"), Platform::Unix);
assert_eq!(Platform::detect("/"), Platform::Unix);
}
#[test]
fn detect_windows_drive() {
assert_eq!(Platform::detect("C:\\Users\\user"), Platform::Windows);
assert_eq!(Platform::detect("D:/Projects"), Platform::Windows);
}
#[test]
fn detect_windows_unc() {
assert_eq!(
Platform::detect("\\\\wsl.localhost\\Ubuntu"),
Platform::Windows
);
}
#[test]
fn normalize_backslashes() {
let p = PathBuf::from("C:\\Users\\user");
assert_eq!(Platform::normalize(&p), PathBuf::from("C:/Users/user"));
}
#[test]
fn normalize_noop_unix() {
let p = PathBuf::from("/home/user");
assert_eq!(Platform::normalize(&p), PathBuf::from("/home/user"));
}
#[test]
fn to_host_display_windows() {
let p = PathBuf::from("C:/Users/user");
assert_eq!(
Platform::to_host_display(&p, Platform::Windows),
"C:\\Users\\user"
);
}
#[test]
fn to_host_display_unix() {
let p = PathBuf::from("/home/user");
assert_eq!(Platform::to_host_display(&p, Platform::Unix), "/home/user");
}
#[test]
fn is_root_unix() {
assert!(Platform::is_root(&PathBuf::from("/"), Platform::Unix));
assert!(Platform::is_root(&PathBuf::from(""), Platform::Unix));
assert!(!Platform::is_root(&PathBuf::from("/home"), Platform::Unix));
}
#[test]
fn is_root_windows_drive() {
assert!(Platform::is_root(&PathBuf::from("C:/"), Platform::Windows));
assert!(Platform::is_root(&PathBuf::from("C:"), Platform::Windows));
assert!(!Platform::is_root(
&PathBuf::from("C:/Users"),
Platform::Windows
));
}
#[test]
fn ensure_drive_root_fixes_bare_drive() {
assert_eq!(
Platform::ensure_drive_root(PathBuf::from("C:"), Platform::Windows),
PathBuf::from("C:/")
);
}
#[test]
fn ensure_drive_root_noop_with_slash() {
assert_eq!(
Platform::ensure_drive_root(PathBuf::from("C:/"), Platform::Windows),
PathBuf::from("C:/")
);
}
#[test]
fn ensure_drive_root_noop_unix() {
assert_eq!(
Platform::ensure_drive_root(PathBuf::from("/"), Platform::Unix),
PathBuf::from("/")
);
}
#[test]
fn is_root_windows_unc() {
assert!(Platform::is_root(
&PathBuf::from("//server/share"),
Platform::Windows
));
assert!(!Platform::is_root(
&PathBuf::from("//server/share/folder"),
Platform::Windows
));
}
}
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