convert to library

Cargo.toml

@@ -5,5 +5,14 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[lib]
+name = "imf_codec"
+path = "src/lib.rs"
+
+
+[[bin]]
+name = "imf_parse"
+path = "src/parse.rs"
+
 [dependencies]
 nom = "7"

src/headers.rs

@@ -124,7 +124,7 @@ fn unstructured(input: &str) -> IResult<&str, String> {
     let body = match r.as_slice() {
         [(None, content)] => content.to_string(),
         [(Some(ws), content)] => ws.to_string() + content,
-        lines => lines.iter().fold(String::with_capacity(255), |mut acc, item| {
+        lines => lines.iter().fold(String::with_capacity(255), |acc, item| {
             let (may_ws, content) = item;
             match may_ws {
                 Some(ws) => acc + ws + content,

src/lib.rs

@@ -0,0 +1,3 @@
+pub mod headers;
+pub mod model;
+mod abnf;

src/parse.rs

@@ -1,6 +1,4 @@
-mod headers;
+use imf_codec::headers;
-mod model;
-mod abnf;
 
 fn main() {
     let header = "Subject: Hello\r\n World\r\nFrom: <quentin@deuxfleurs.fr>\r\n\r\n";