Add the opensmtpd_derive crate

src/error.rs

@@ -1,27 +0,0 @@
-use nom::error::Error;
-use nom::Err;
-use pretty_hex::pretty_hex;
-
-fn error_to_string(e: Error<&[u8]>) -> String {
-    format!(
-        "parsing error: {:?}: input:{}",
-        e.code,
-        get_pretty_hex(&e.input)
-    )
-}
-
-pub(crate) fn get_pretty_hex(input: &[u8]) -> String {
-    let mut s = String::new();
-    for l in pretty_hex(&input).split('\n') {
-        s += &format!("\n{}", l);
-    }
-    s
-}
-
-pub(crate) fn nom_err_to_string(e: Err<Error<&[u8]>>) -> String {
-    match e {
-        Err::Incomplete(_) => e.to_string(),
-        Err::Error(er) => error_to_string(er),
-        Err::Failure(er) => error_to_string(er),
-    }
-}