temp

src/main.rs

@@ -1,3 +1,56 @@
-fn main() {
-    println!("Hello, world!");
+use nom::{
+    IResult, Parser,
+    branch::permutation,
+    bytes::take_until,
+    character::{char, complete::multispace1},
+    error::{FromExternalError, ParseError},
+    multi::{fold, many_m_n},
+    sequence::{delimited, preceded},
+};
+
+enum Fragment<'a> {
+    Literal(&'a str),
+    Header(&'a str),
+}
+
+fn main() {
+    let input = concat!(
+        "Hallo daar!\n",
+        "Hoe gaat het?\n",
+        "# Met mij gaat het goed\n",
+        "Met jou\n",
+        "## Ja ook goed\n",
+        "Echt?\n",
+        "### Wow (not matched because we only accept 1 or 2 '#')\n",
+        "#StartOfFileHeaderNoSpace <-- not matched because we require a space after '#'\n",
+        "  ## Indented header\n"
+    );
+
+    let x = parse_string::<()>(input).unwrap();
+    println!("{:?}", x);
+}
+
+fn parse_string<'a, E>(input: &'a str) -> IResult<&'a str, String, E>
+where
+    E: ParseError<&'a str> + FromExternalError<&'a str, std::num::ParseIntError>,
+{
+    fold(0.., parse_header, String::new, |mut string, newstr| {
+        string.push_str(newstr);
+        string
+    })
+    .parse(input)
+}
+fn parse_fragment<'a, E>(input: &'a str) -> IResult<&'a str, StringFragment<'a>, E>
+where
+    E: ParseError<&'a str> + FromExternalError<&'a str, std::num::ParseIntError>,
+{
+    alt((map(parse_header, Fragment::Header)))
+}
+
+fn parse_header<'a, E: ParseError<&'a str>>(input: &'a str) -> IResult<&'a str, &'a str, E> {
+    preceded(
+        permutation((char('\n'), many_m_n(1, 2, char('#')))),
+        take_until("\n"),
+    )
+    .parse(input)
 }