Handle any string replacement.

src/app.rs

@@ -258,8 +258,7 @@ fn usage() -> HashMap<&'static str, Help> {
         , "Shows the full path starting from the root as opposed to relative paths.");
     doc!(h, "path-separator"
         , "Set the path separator to use when printing file paths."
-        , "Set the path separator to use when printing file paths. \
-           A path separator is limited to a single byte.");
+        , "Set the path separator to use when printing file paths.");
     doc!(h, "follow"
         , "Follow symbolic links"
         , "By default, fd does not descend into symlinked directories. Using this flag, symbolic \

src/internal/opts.rs

@@ -77,5 +77,5 @@ pub struct FdOptions {
     pub show_filesystem_errors: bool,
 
     /// The separator used to print file paths.
-    pub path_separator: Option<u8>,
+    pub path_separator: Option<String>,
 }

src/main.rs

@@ -114,19 +114,8 @@ fn main() {
         _ => atty::is(Stream::Stdout),
     };
 
-    let path_separator: Option<u8> = match matches.value_of("path-separator") {
-        Some(sep_str) => {
-            let sep = sep_str.as_bytes();
-            if sep.len() != 1 {
-                print_error_and_exit!(
-                    "'{}' is not a valid path separator. See 'fd --help'.",
-                    sep_str
-                );
-            }
-            Some(sep[0])
-        }
-        None => None,
-    };
+    let path_separator: Option<String> =
+        matches.value_of("path-separator").map(|str| str.to_owned());
 
     #[cfg(windows)]
     let colored_output = colored_output && ansi_term::enable_ansi_support().is_ok();

src/output.rs

@@ -69,16 +69,10 @@ fn print_entry_colorized(
 
         let path_string = component.to_string_lossy();
 
-        match config.path_separator {
+        match &config.path_separator {
             None => write!(stdout, "{}", style.paint(path_string))?,
             Some(sep) => {
-                let mut path_bytes = path_string.as_bytes().to_vec();
-                for b in &mut path_bytes {
-                    if *b == b'/' || (cfg!(windows) && *b == b'\\') {
-                        *b = sep;
-                    }
-                }
-                let path_string = String::from_utf8_lossy(&path_bytes);
+                let path_string = path_string.replace(std::path::MAIN_SEPARATOR, &sep);
                 write!(stdout, "{}", style.paint(path_string))?
             }
         }