Implement a planning parser.

src/parser/planning.rs

@@ -1,8 +1,42 @@
+use nom::branch::alt;
+use nom::bytes::complete::is_not;
+use nom::bytes::complete::tag;
+use nom::bytes::complete::tag_no_case;
+use nom::character::complete::line_ending;
+use nom::character::complete::space0;
+use nom::character::complete::space1;
+use nom::combinator::eof;
+use nom::multi::separated_list1;
+use nom::sequence::tuple;
+
 use super::Context;
 use crate::error::Res;
 use crate::parser::lesser_element::Planning;
+use crate::parser::util::get_consumed;
+use crate::parser::util::start_of_line;
 
 #[tracing::instrument(ret, level = "debug")]
 pub fn planning<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Planning<'s>> {
-    todo!()
+    start_of_line(context, input)?;
+    let (remaining, _leading_whitespace) = space0(input)?;
+    let (remaining, _planning_parameters) = separated_list1(space1, planning_parameter)(remaining)?;
+    let (remaining, _trailing_ws) = tuple((space0, alt((line_ending, eof))))(remaining)?;
+
+    let source = get_consumed(input, remaining);
+
+    Ok((remaining, Planning { source }))
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn planning_parameter<'s>(input: &'s str) -> Res<&'s str, &'s str> {
+    let (remaining, _planning_type) = alt((
+        tag_no_case("DEADLINE"),
+        tag_no_case("SCHEDULED"),
+        tag_no_case("CLOSED"),
+    ))(input)?;
+    let (remaining, _gap) = tuple((tag(":"), space1))(remaining)?;
+    // TODO: Make this invoke the real timestamp parser.
+    let (remaining, _timestamp) = tuple((tag("<"), is_not("\r\n>"), tag(">")))(remaining)?;
+    let source = get_consumed(input, remaining);
+    Ok((remaining, source))
 }