Merge pull request #738 from HKalbasi/master

Add file related methods for wasi

url/src/lib.rs

@@ -2321,7 +2321,7 @@ impl Url {
     /// # run().unwrap();
     /// # }
     /// ```
-    #[cfg(any(unix, windows, target_os = "redox"))]
+    #[cfg(any(unix, windows, target_os = "redox", target_os = "wasi"))]
     #[allow(clippy::result_unit_err)]
     pub fn from_file_path<P: AsRef<Path>>(path: P) -> Result<Url, ()> {
         let mut serialization = "file://".to_owned();
@@ -2358,7 +2358,7 @@ impl Url {
     ///
     /// Note that `std::path` does not consider trailing slashes significant
     /// and usually does not include them (e.g. in `Path::parent()`).
-    #[cfg(any(unix, windows, target_os = "redox"))]
+    #[cfg(any(unix, windows, target_os = "redox", target_os = "wasi"))]
     #[allow(clippy::result_unit_err)]
     pub fn from_directory_path<P: AsRef<Path>>(path: P) -> Result<Url, ()> {
         let mut url = Url::from_file_path(path)?;
@@ -2475,7 +2475,7 @@ impl Url {
     /// (That is, if the percent-decoded path contains a NUL byte or,
     /// for a Windows path, is not UTF-8.)
     #[inline]
-    #[cfg(any(unix, windows, target_os = "redox"))]
+    #[cfg(any(unix, windows, target_os = "redox", target_os = "wasi"))]
     #[allow(clippy::result_unit_err)]
     pub fn to_file_path(&self) -> Result<PathBuf, ()> {
         if let Some(segments) = self.path_segments() {
@@ -2679,12 +2679,15 @@ impl<'de> serde::Deserialize<'de> for Url {
     }
 }
 
-#[cfg(any(unix, target_os = "redox"))]
+#[cfg(any(unix, target_os = "redox", target_os = "wasi"))]
 fn path_to_file_url_segments(
     path: &Path,
     serialization: &mut String,
 ) -> Result<(u32, HostInternal), ()> {
+    #[cfg(any(unix, target_os = "redox"))]    
     use std::os::unix::prelude::OsStrExt;
+    #[cfg(target_os = "wasi")]    
+    use std::os::wasi::prelude::OsStrExt;
     if !path.is_absolute() {
         return Err(());
     }
@@ -2774,13 +2777,16 @@ fn path_to_file_url_segments_windows(
     Ok((host_end, host_internal))
 }
 
-#[cfg(any(unix, target_os = "redox"))]
+#[cfg(any(unix, target_os = "redox", target_os = "wasi"))]
 fn file_url_segments_to_pathbuf(
     host: Option<&str>,
     segments: str::Split<'_, char>,
 ) -> Result<PathBuf, ()> {
     use std::ffi::OsStr;
+    #[cfg(any(unix, target_os = "redox"))]    
     use std::os::unix::prelude::OsStrExt;
+    #[cfg(target_os = "wasi")]    
+    use std::os::wasi::prelude::OsStrExt;
 
     if host.is_some() {
         return Err(());