Permission modes don't exist on non-unix platforms

src/input.rs

@@ -2,6 +2,7 @@ use std::convert::TryFrom;
 use std::fs;
 use std::fs::File;
 use std::io::{self, BufRead, BufReader, Read};
+#[cfg(unix)]
 use std::os::unix::fs::PermissionsExt;
 use std::path::{Path, PathBuf};
 use std::time::SystemTime;
@@ -139,21 +140,32 @@ impl<'a> Input<'a> {
         Self::_ordinary_file(path.as_ref())
     }
 
+    #[cfg(unix)]
+    fn _input_permissions_os(metadata: fs::Metadata) -> Option<InputPermissions> {
+        Some(InputPermissions {
+            // the 3 digits from right are the familiar mode bits
+            // we are looking for
+            mode: metadata.permissions().mode() & 0o777,
+        })
+    }
+
+    #[cfg(not(unix))]
+    fn _input_permissions_os(_metadata: fs::Metadata) -> Option<InputPermissions> {
+        None
+    }
+
     fn _ordinary_file(path: &Path) -> Self {
         let kind = InputKind::OrdinaryFile(path.to_path_buf());
         let metadata = match fs::metadata(path.to_path_buf()) {
             Ok(meta) => {
                 let size = meta.len();
                 let modified = meta.modified().ok();
-                let perm = meta.permissions();
+                let permissions = Self::_input_permissions_os(meta);
+
                 InputMetadata {
                     size: Some(size),
                     modified: modified,
-                    permissions: Some(InputPermissions {
-                        // the 3 digits from right are the familiar mode bits
-                        // we are looking for
-                        mode: perm.mode() & 0o777,
-                    }),
+                    permissions: permissions,
                     ..InputMetadata::default()
                 }
             }