Initial commit

.gitignore

@@ -0,0 +1 @@
+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "imf-codec"
+version = "0.1.0"
+dependencies = [
+ "nom",
+]
+
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
+[[package]]
+name = "nom"
+version = "7.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d273983c5a657a70a3e8f2a01329822f3b8c8172b73826411a55751e404a0a4a"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+]

Cargo.toml

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+[package]
+name = "imf-codec"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+nom = "7"

rfc822.eml

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+From: someone@example.com
+To: someone_else@example.com
+Subject: An RFC 822 formatted message
+
+This is the plain text body of the message. Note the blank line
+between the header information and the body of the message.

src/main.rs

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+use nom::{
+    IResult, 
+    character::complete::alphanumeric1,
+    bytes::complete::tag,
+    bytes::complete::take_until1,
+};
+
+#[derive(Debug, PartialEq)]
+pub struct HeaderField {
+    pub name: String,
+    pub body: String,
+}
+
+fn parse_header_field(input: &str) -> IResult<&str, HeaderField> {
+    let (input, name) = alphanumeric1(input)?;
+    let (input, _) = tag(": ")(input)?;
+    let (input, body) = take_until1("\r\n")(input)?;
+    Ok((input, HeaderField { name: name.to_string(), body: body.to_string() }))
+}
+
+fn main() {
+    let header_fields = "Subject: Hello\r\n World";
+    println!("{:?}", parse_header_field(header_fields));
+}