Added feature (default) `byte-strings`: Operate on raw byte strings instead of UTF8 strings.

Fortune for reverse's current commit: Blessing − 吉

Cargo.toml

@@ -7,7 +7,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
-default = ["output-lines", "buffer-output", "ignore-output-errors", "ignore-invalid-args"]
+default = ["output-lines", "buffer-output", "ignore-output-errors", "ignore-invalid-args", "byte-strings"]
 
 # Output as lines instead of `["2", "1", "0"]`
 output-lines = []
@@ -25,7 +25,8 @@ ignore-output-errors = []
 # Ignore invalid arguments instead of removing invalid UTF8 characters if they exist in the argument
 ignore-invalid-args = []
 
-# Operate on OsString/byte arrays instead of strings; so non-utf8 characters will be preserved.
+# Operate on raw input byte arrays instead of strings; so non-utf8 characters will be preserved in both input and output
+# NOTE: `ignore-invalid-args` will do nothing if this is enabled.
 byte-strings = []
 
 [profile.release]

src/main.rs

@@ -39,11 +39,29 @@ fn collect_input() -> Box<dyn Iterator<Item= impl Input + 'static> + 'static>
 	os::unix::ffi::*,
     };
     
-    #[derive(Debug)]
+    //#[derive(Debug)]
     enum MaybeUTF8
     {
 	UTF8(String),
 	Raw(OsString),
+	Static(&'static [u8]),
+    }
+
+    impl std::fmt::Debug for MaybeUTF8
+    {
+	// Custom Debug impl to ensure output is identical when `output-quoted` is enabled.
+	#[inline] 
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
+	{
+	    let dbg: &dyn std::fmt::Debug = match self {
+		Self::UTF8(string) => string,
+		Self::Raw(raw) => raw,
+		
+		Self::Static(&[])  => return f.write_str("\"\""),
+		Self::Static(bytes) => return std::fmt::Debug::fmt(OsStr::from_bytes(bytes), f),
+	    };
+	    std::fmt::Debug::fmt(dbg, f)
+	}
     }
 
     impl AsRef<[u8]> for MaybeUTF8
@@ -54,6 +72,7 @@ fn collect_input() -> Box<dyn Iterator<Item= impl Input + 'static> + 'static>
 	    match self {
 		Self::UTF8(string) => string.as_bytes(),
 		Self::Raw(raw) => raw.as_bytes(),
+		Self::Static(bytes) => bytes,
 	    }
 	}
     }
@@ -76,16 +95,20 @@ fn collect_input() -> Box<dyn Iterator<Item= impl Input + 'static> + 'static>
 	}
     }
 
-    #[allow(dead_code)]
     impl MaybeUTF8
     {
+	#[inline(always)] 
+	pub const fn from_static_bytes(bytes: &'static [u8]) -> Self
+	{
+	    Self::Static(bytes)
+	}
 	#[inline(always)] 
 	pub fn from_raw_bytes(bytes: &[u8]) -> Self
 	{
 	    Self::Raw(OsStr::from_bytes(bytes).to_os_string())
 	}
 	#[inline(always)]
-	#[deprecated(note="XXX: TODO: Only use this if the read_until() into vec does not add the '\n' into the vec as well. Otherwise, *always* use this.")]
+	//#[deprecated(note="XXX: TODO: Only use this if the read_until() into vec does not add the '\n' into the vec as well. Otherwise, *always* use this.")]
 	pub fn from_raw_vec(vec: Vec<u8>) -> Self
 	{
 	    Self::Raw(OsString::from_vec(vec))
@@ -116,10 +139,16 @@ fn collect_input() -> Box<dyn Iterator<Item= impl Input + 'static> + 'static>
 		{
 		    Some(match handle_fmt_err_or(self.0.read_until(b'\n', &mut self.1), || 0) {
 			0 => return None,
+			1 if self.1[0] == b'\n' => MaybeUTF8::from_static_bytes(&[]),
 			read_sz => {
-			    let line = MaybeUTF8::from_raw_bytes(&self.1[..]); //TODO: XXX: If self.1 here does not have the '\n' added into it by read_until(); use from_raw_vec(self.1.clone()) instead; it'll be more efficient.
+			    let line = if self.1[read_sz-1] == b'\n' {
+				MaybeUTF8::from_raw_bytes(&self.1[..(read_sz-1)])
+			    } else {
+				MaybeUTF8::from_raw_vec(self.1.clone())
+			    };
+			    debug_assert_ne!(line.as_ref().iter().last().copied(), Some(b'\n'), "Deliminator still in output");
+			    
 			    self.1.clear();
-			    //TODO: todo!("Do we need read_sz ({read_sz}) at all here? Will the `\n` be inside the read string?");
 			    line
 			},
 		    })
@@ -141,20 +170,26 @@ fn collect_input() -> Box<dyn Iterator<Item= impl Input + 'static> + 'static>
     }
 }
 
+#[allow(dead_code)]
 #[cfg_attr(feature="ignore-output-errors", inline)]
 fn handle_fmt_err_or<F, T>(res: std::io::Result<T>, or: F) -> T
 where F: FnOnce() -> T
 {
-    #[cfg(not(feature="ignore-output-errors"))]
-    if let Err(e) = res {
-	eprintln!("[!] failed to write line: {e}");
-	or()
+    #[cfg(not(feature="ignore-output-errors"))] {
+	match res {
+	    Ok(v) => return v,
+	    Err(e) => eprintln!("[!] failed to write line: {e}"),
+	}
+	return or();
     }
+    
+    
     #[cfg(feature="ignore-output-errors")]
     res.unwrap_or_else(|_| or())
 }
 
-#[cfg_attr(feature="ignore-output-errors", inline(always))]
+#[allow(dead_code)]
+    #[cfg_attr(feature="ignore-output-errors", inline(always))]
 fn handle_fmt_err<T>(res: std::io::Result<T>)
 {
     #[cfg(not(feature="ignore-output-errors"))]