From 34afb332ce7d06d6ab8126682ab1b1615077f2eb Mon Sep 17 00:00:00 2001
From: GregPlowman <GregPlowman@users.noreply.github.com>
Date: Tue, 19 Jan 2021 08:52:40 +1100
Subject: [PATCH 1/2] Add methods for pushfirst! and popfirst!

---
 src/OffsetArrays.jl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/OffsetArrays.jl b/src/OffsetArrays.jl
index 582661dd..f844b8f6 100644
--- a/src/OffsetArrays.jl
+++ b/src/OffsetArrays.jl
@@ -367,7 +367,9 @@ Base.show(io::IO, ::MIME"text/plain", r::OffsetRange) = show(io, r)
 
 Base.resize!(A::OffsetVector, nl::Integer) = (resize!(A.parent, nl); A)
 Base.push!(A::OffsetVector, x...) = (push!(A.parent, x...); A)
+Base.pushfirst!(A::OffsetVector, x...) = (pushfirst!(A.parent, x...); A)
 Base.pop!(A::OffsetVector) = pop!(A.parent)
+Base.popfirst!(A::OffsetVector) = popfirst!(A.parent)
 Base.append!(A::OffsetVector, items) = (append!(A.parent, items); A)
 Base.empty!(A::OffsetVector) = (empty!(A.parent); A)
 

From 005e5098d35def6f985d6205d6cab0100bbddfa2 Mon Sep 17 00:00:00 2001
From: GregPlowman <GregPlowman@users.noreply.github.com>
Date: Tue, 19 Jan 2021 08:57:57 +1100
Subject: [PATCH 2/2] Tests for pushfirst! and popfirst!

---
 test/runtests.jl | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/test/runtests.jl b/test/runtests.jl
index 91571549..f2804391 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1440,14 +1440,37 @@ end
     @test push!(o, 2, 3) === o
     @test axes(o, 1) == 0:2
     @test o[end-1:end] == [2, 3]
+
+    # pushfirst!
+    o = OffsetVector(Int[], -1)
+    @test pushfirst!(o) === o
+    @test axes(o, 1) == 0:-1
+    @test pushfirst!(o, 1) === o
+    @test axes(o, 1) == 0:0
+    @test o[end] == 1
+    @test pushfirst!(o, 2, 3) === o
+    @test axes(o, 1) == 0:2
+    if VERSION >= v"1.5"
+        @test o[begin:begin+1] == [2, 3]
+    else
+        @test o[0:1] == [2, 3]
+    end
+
     # pop!
     o = OffsetVector([1, 2, 3], -1)
     @test pop!(o) == 3
     @test axes(o, 1) == 0:1
+
+    # popfirst!
+    o = OffsetVector([1, 2, 3], -1)
+    @test popfirst!(o) == 1
+    @test axes(o, 1) == 0:1
+
     # append!
     o = OffsetVector([1, 2, 3], -1)
     append!(o, [4, 5])
     @test axes(o, 1) == 0:4
+
     # empty!
     o = OffsetVector([1, 2, 3], -1)
     @test empty!(o) === o