From 67c8781f2bbdc991fe4b560b1744be9abf32f302 Mon Sep 17 00:00:00 2001
From: Michal Sojka <michal.sojka@cvut.cz>
Date: Mon, 6 Sep 2021 16:41:56 +0200
Subject: [PATCH] Fix another hist BoundsError

This fixes the error with `hist([1,1,1], bs=1)`:

    ERROR: BoundsError: attempt to access 0-element Vector{Int64} at index [0]
    Stacktrace:
     [1] getindex
       @ ./array.jl:801 [inlined]
     [2] hist(v::Vector{Int64}; range::Vector{Float64}, bs::Int64, nbins::Int64, pad::Bool)
       @ Gnuplot ~/.julia/dev/Gnuplot/src/Gnuplot.jl:1864
     [3] top-level scope
       @ REPL[50]:1
---
 src/Gnuplot.jl   | 10 +++++++---
 test/runtests.jl |  1 +
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/Gnuplot.jl b/src/Gnuplot.jl
index 7c82e50..a2d8242 100644
--- a/src/Gnuplot.jl
+++ b/src/Gnuplot.jl
@@ -1846,15 +1846,19 @@ function hist(v::Vector{T}; range=[NaN,NaN], bs=NaN, nbins=0, pad=true) where T
         if sum(hh.weights) < length(i)
             j = findall(v[i] .== range[2])
             @assert length(j) == (length(i) - sum(hh.weights))
-            hh.weights[end] += length(j)
+            if length(hh.weights) > 0
+                hh.weights[end] += length(j)
+            else
+                push!(hh.weights, length(j))
+            end
         end
     else
         hh = fit(Histogram, v[i], closed=:left)
     end
     @assert sum(hh.weights) == length(i)
     x = collect(hh.edges[1])
-    binsize = x[2] - x[1]
-    x = (x[1:end-1] .+ x[2:end]) ./ 2
+    binsize = isfinite(bs) ? bs : x[2] - x[1]
+    length(x) > 1 && (x = (x[1:end-1] .+ x[2:end]) ./ 2)
     h = hh.weights
     if pad
         x = [x[1]-binsize, x..., x[end]+binsize]
diff --git a/test/runtests.jl b/test/runtests.jl
index 53fe0fe..a9a806a 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -288,5 +288,6 @@ Gnuplot.options.dry = true
 
 # Various hist() corner cases
 @gp hist([1,2,3], bs=2)
+@gp hist([1,1,1], bs=1)
 
 Gnuplot.quitall()