From a58b605e59c629b31ecdc5e31bf63ef9a5b80925 Mon Sep 17 00:00:00 2001
From: Tom Alexander <tom@fizz.buzz>
Date: Sun, 24 May 2020 14:17:53 -0400
Subject: [PATCH] Add support for dot paths to owned_walk_path.

---
 src/renderer/walking.rs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/renderer/walking.rs b/src/renderer/walking.rs
index b699254..4bc289b 100644
--- a/src/renderer/walking.rs
+++ b/src/renderer/walking.rs
@@ -74,7 +74,30 @@ pub fn owned_walk_path<'a>(
     breadcrumbs: &'a Vec<Box<dyn ContextElement>>,
     path: &Vec<String>,
 ) -> Result<&'a dyn ContextElement, WalkError> {
+    if path.is_empty() {
+        return Ok(breadcrumbs
+            .last()
+            .expect("Breadcrumbs should never be empty")
+            .as_ref());
+    }
+
     let path_reference: Vec<&str> = path.iter().map(|p| &p[..]).collect();
+    if path.first().expect("Already proved path is not empty") == "." {
+        return match walk_path_from_single_level(
+            breadcrumbs
+                .last()
+                .expect("Breadcrumbs should never be empty")
+                .as_ref(),
+            &path_reference[1..],
+        ) {
+            // If no walking was done at all or we partially walked
+            // then stop trying to find anything because '.' restricts
+            // us to the current scope
+            WalkResult::NoWalk | WalkResult::PartialWalk => Err(WalkError::CantWalk),
+            WalkResult::FullyWalked(new_context) => Ok(new_context),
+        };
+    }
+
     for context in breadcrumbs.iter().rev() {
         match walk_path_from_single_level(context.as_ref(), &path_reference) {
             // If no walking was done at all, keep looping