Added BOM sniffing check to file load

Cargo.toml

@@ -28,6 +28,7 @@ async = ["async-trait"]
 lazy_static = "1.4"
 serde = "1.0"
 nom = "7"
+encoding_rs_io = "0.1"
 
 async-trait = { version = "0.1", optional = true }
 toml = { version = "0.8", optional = true }

src/file/source/file.rs

@@ -1,9 +1,11 @@
 use std::env;
 use std::error::Error;
-use std::fs;
 use std::io;
+use std::io::Read;
 use std::path::PathBuf;
 
+use encoding_rs_io::DecodeReaderBytesBuilder;
+
 use crate::file::{
     format::ALL_EXTENSIONS, source::FileSourceResult, FileSource, FileStoredFormat, Format,
 };
@@ -114,8 +116,15 @@ where
             .and_then(|base| pathdiff::diff_paths(&filename, base))
             .unwrap_or_else(|| filename.clone());
 
-        // Read contents from file
-        let text = fs::read_to_string(filename)?;
+        let mut text = String::new();
+
+        DecodeReaderBytesBuilder::new()
+            // On Windows, we need to check for added Byte Order Mark (BOM). To
+            // do this, we don't specify an encoding, and enable BOM sniffing.
+            .encoding(None)
+            .bom_sniffing(true)
+            .build(std::fs::File::open(filename)?)
+            .read_to_string(&mut text)?;
 
         Ok(FileSourceResult {
             uri: Some(uri.to_string_lossy().into_owned()),