From 6d1675fa0000aed5b969b2011985d1e87a87b170 Mon Sep 17 00:00:00 2001
From: Tom Alexander <tom@fizz.buzz>
Date: Tue, 22 Aug 2023 22:57:44 -0400
Subject: [PATCH] Lifetime issue.

---
 src/parser/org_source.rs | 91 +++++++++++++++++++++++++++++++++++++++-
 src/parser/util.rs       | 10 +++++
 2 files changed, 100 insertions(+), 1 deletion(-)

diff --git a/src/parser/org_source.rs b/src/parser/org_source.rs
index 8afd74b7..c0e70f49 100644
--- a/src/parser/org_source.rs
+++ b/src/parser/org_source.rs
@@ -1,10 +1,14 @@
 use std::ops::RangeBounds;
 
 use nom::Compare;
+use nom::InputIter;
+use nom::InputLength;
 use nom::InputTake;
+use nom::InputTakeAtPosition;
+use nom::Offset;
 use nom::Slice;
 
-#[derive(Debug)]
+#[derive(Debug, Copy, Clone)]
 pub struct OrgSource<'s> {
     full_source: &'s str,
     start: usize,
@@ -107,6 +111,91 @@ impl<'s> std::fmt::Display for OrgSource<'s> {
     }
 }
 
+impl<'s> InputLength for OrgSource<'s> {
+    fn input_len(&self) -> usize {
+        todo!()
+    }
+}
+
+impl<'s> InputIter for OrgSource<'s> {
+    type Item = <&'s str as InputIter>::Item;
+
+    type Iter = <&'s str as InputIter>::Iter;
+
+    type IterElem = <&'s str as InputIter>::IterElem;
+
+    fn iter_indices(&self) -> Self::Iter {
+        todo!()
+    }
+
+    fn iter_elements(&self) -> Self::IterElem {
+        todo!()
+    }
+
+    fn position<P>(&self, predicate: P) -> Option<usize>
+    where
+        P: Fn(Self::Item) -> bool,
+    {
+        todo!()
+    }
+
+    fn slice_index(&self, count: usize) -> Result<usize, nom::Needed> {
+        todo!()
+    }
+}
+
+impl<'s> Offset for OrgSource<'s> {
+    fn offset(&self, second: &Self) -> usize {
+        todo!()
+    }
+}
+
+impl<'s> InputTakeAtPosition for OrgSource<'s> {
+    type Item = <&'s str as InputTakeAtPosition>::Item;
+
+    fn split_at_position<P, E: nom::error::ParseError<Self>>(
+        &self,
+        predicate: P,
+    ) -> nom::IResult<Self, Self, E>
+    where
+        P: Fn(Self::Item) -> bool,
+    {
+        todo!()
+    }
+
+    fn split_at_position1<P, E: nom::error::ParseError<Self>>(
+        &self,
+        predicate: P,
+        e: nom::error::ErrorKind,
+    ) -> nom::IResult<Self, Self, E>
+    where
+        P: Fn(Self::Item) -> bool,
+    {
+        todo!()
+    }
+
+    fn split_at_position_complete<P, E: nom::error::ParseError<Self>>(
+        &self,
+        predicate: P,
+    ) -> nom::IResult<Self, Self, E>
+    where
+        P: Fn(Self::Item) -> bool,
+    {
+        todo!()
+    }
+
+    fn split_at_position1_complete<P, E: nom::error::ParseError<Self>>(
+        &self,
+        predicate: P,
+        e: nom::error::ErrorKind,
+    ) -> nom::IResult<Self, Self, E>
+    where
+        P: Fn(Self::Item) -> bool,
+    {
+        todo!()
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/src/parser/util.rs b/src/parser/util.rs
index 47a64d4e..b858a778 100644
--- a/src/parser/util.rs
+++ b/src/parser/util.rs
@@ -14,6 +14,7 @@ use nom::multi::many0;
 use nom::multi::many_till;
 use nom::sequence::tuple;
 
+use super::org_source::OrgSource;
 use super::parser_context::ContextElement;
 use super::Context;
 use crate::error::CustomError;
@@ -113,6 +114,15 @@ pub fn blank_line(input: &str) -> Res<&str, &str> {
     recognize(tuple((space0, alt((line_ending, eof)))))(input)
 }
 
+/// A line containing only whitespace and then a line break
+///
+/// It is up to the caller to ensure this is called at the start of a line.
+#[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
+pub fn new_blank_line<'s>(input: OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>> {
+    not(eof)(input)?;
+    recognize(tuple((space0, alt((line_ending, eof)))))(input)
+}
+
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
 pub fn element_trailing_whitespace<'r, 's>(
     context: Context<'r, 's>,