From 467ae2789e7684cc4bf759eb3e86ce78b06bd89f Mon Sep 17 00:00:00 2001
From: singularitti <singularitti@outlook.com>
Date: Wed, 1 Nov 2023 10:14:04 -0400
Subject: [PATCH] Add checks in `ReciprocalPath` constructor

---
 src/reciprocal.jl | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/reciprocal.jl b/src/reciprocal.jl
index 27594c0..2118404 100644
--- a/src/reciprocal.jl
+++ b/src/reciprocal.jl
@@ -90,7 +90,15 @@ struct ReciprocalPath{T}
     start_node::ReducedCoordinates{T}
     end_node::ReducedCoordinates{T}
     density::Int64
+    function ReciprocalPath{T}(start_node, end_node, density) where {T}
+        if density < 2
+            throw(ArgumentError("you need at least two points to define a path!"))
+        end
+        return new(start_node, end_node, density)
+    end
 end
+ReciprocalPath(start_node, end_node, density) =
+    ReciprocalPath{Base.promote_eltype(start_node, end_node)}(start_node, end_node, density)
 function ReciprocalPath(bz::BrillouinZone, start_node::Symbol, end_node::Symbol, density)
     points = specialpoints(bz)
     return ReciprocalPath(points[start_node], points[end_node], density)