Get st_flags from MetadataExt on MacOS

I missed that `st_flags` is available on `MetadataExt` on MacOS, so get
them from there, instead of calling `libc::stat`.

type: reform

CHANGELOG.md

@@ -4,7 +4,8 @@ Changelog
 
 UNRELEASED - 2020-04-21
 -----------------------
-- :sparkles: [`xxxxxxxxxxxx`](https://github.com/casey/intermodal/commits/master) Allow suppressing output with `--quiet` - Fixes [#174](https://github.com/casey/intermodal/issues/174) - _Celeo <celeodor@gmail.com>_
+- :art: [`xxxxxxxxxxxx`](https://github.com/casey/intermodal/commits/master) Get `st_flags` from `MetadataExt` on MacOS - _Casey Rodarmor <casey@rodarmor.com>_
+- :sparkles: [`deca555ac3b3`](https://github.com/casey/intermodal/commit/deca555ac3b3b8f665ee6415f80e05b2bb5e4af7) Allow suppressing output with `--quiet` - Fixes [#174](https://github.com/casey/intermodal/issues/174) - _Celeo <celeodor@gmail.com>_
 - :books: [`838167c4d3bc`](https://github.com/casey/intermodal/commit/838167c4d3bcbe2fa28f27a00bd94b959ad31e15) Describe in FAQ creating torrent from git repo - _Casey Rodarmor <casey@rodarmor.com>_
 - :sparkles: [`9b72873ed13e`](https://github.com/casey/intermodal/commit/9b72873ed13e8f0ae747714545c48c6e37c67dd0) Optionally respect `.gitignore` in `imdl torrent create` - Fixes [#378](https://github.com/casey/intermodal/issues/378) - _Celeo <celeodor@gmail.com>_
 - :books: [`9f480624616b`](https://github.com/casey/intermodal/commit/9f480624616b77995befec722effda22cc2d06ad) Improve FAQ template - _Casey Rodarmor <casey@rodarmor.com>_

src/platform.rs

@@ -17,29 +17,13 @@ impl PlatformInterface for Platform {
 #[cfg(target_os = "macos")]
 impl PlatformInterface for Platform {
   fn hidden(path: &Path) -> Result<bool, Error> {
-    use std::{ffi::CString, mem, os::unix::ffi::OsStrExt};
+    use std::os::macos::fs::MetadataExt;
 
     const HIDDEN_MASK_MAC: u32 = 0x0000_8000;
 
-    let mut stat: libc::stat = unsafe { mem::zeroed() };
+    let metadata = path.metadata().context(error::Filesystem { path })?;
 
-    let cpath = if let Ok(cstr) = CString::new(path.as_os_str().as_bytes()) {
-      cstr
-    } else {
-      // Consider paths containing null bytes to be hidden
-      return Ok(true);
-    };
-
-    let error_code = unsafe { libc::stat(cpath.as_ptr(), &mut stat) };
-
-    if error_code != 0 {
-      return Err(Error::Filesystem {
-        source: io::Error::from_raw_os_error(error_code),
-        path: path.to_owned(),
-      });
-    }
-
-    Ok(stat.st_flags & HIDDEN_MASK_MAC != 0)
+    Ok(metadata.st_flags() & HIDDEN_MASK_MAC != 0)
   }
 }
 
@@ -49,3 +33,35 @@ impl PlatformInterface for Platform {
     Ok(false)
   }
 }
+
+#[cfg(tests)]
+mod tests {
+  use super::*;
+
+  #[test]
+  fn hidden() {
+    let tmp = tempdir().unwrap();
+
+    let file = tmp.path().join("file");
+
+    assert!(!Platform::hidden(&file));
+
+    if cfg!(target_os = "windows") {
+      Command::new("attrib")
+        .arg("+h")
+        .arg(&file)
+        .status()
+        .unwrap();
+    } else if cfg!(target_os = "macos") {
+      Command::new("chflags")
+        .arg("hidden")
+        .arg(&file)
+        .status()
+        .unwrap();
+    } else {
+      return;
+    }
+
+    assert!(Platform::hidden(&file));
+  }
+}