From df995db8f9875bd6ee057c3ad774e61940cdd4a9 Mon Sep 17 00:00:00 2001
From: t-bltg <tf.bltg@gmail.com>
Date: Sun, 19 Dec 2021 23:49:21 +0100
Subject: [PATCH] update CI for julia LTS 1.6

---
 .github/workflows/ci.yml | 12 ++++++---
 src/canvas/imgcanvas.jl  | 55 ++++++++++++++++++++--------------------
 2 files changed, 37 insertions(+), 30 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 11e6c631..ae689dff 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,9 +14,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: ['1.0', '1', 'nightly']
-        os: [ubuntu-latest]
-        arch: [x64]
+        version:
+          - '1.6'   # LTS
+          - '1'     # latest stable
+          - 'nightly'
+        os:
+          - ubuntu-latest
+        arch:
+          - x64
         include:  # spare windows/macos CI credits
           - os: windows-latest
             version: '1'
@@ -24,6 +29,7 @@ jobs:
           - os: macOS-latest
             version: '1'
             arch: x64
+
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1
diff --git a/src/canvas/imgcanvas.jl b/src/canvas/imgcanvas.jl
index 4d84d23a..96291d70 100644
--- a/src/canvas/imgcanvas.jl
+++ b/src/canvas/imgcanvas.jl
@@ -1,39 +1,40 @@
 struct ImgCanvas <: Canvas
-  img::AbstractArray{<:Colorant}
-  ren::Vector{String}
-  encoded_size::Vector{Int}
-  sixel::Ref
+    img::AbstractArray{<:Colorant}
+    ren::Vector{String}
+    encoded_size::Vector{Int}
+    sixel::Ref
 end
 
-function ImgCanvas(img::AbstractArray{<:Colorant})
-  render(ImgCanvas(img, String[], [0, 0], Ref(false)))
-end
+ImgCanvas(img::AbstractArray{<:Colorant}) =
+    render(ImgCanvas(img, String[], [0, 0], Ref(false)))
 
 @inline nrows(c::ImgCanvas) = c.encoded_size[1]
 @inline ncols(c::ImgCanvas) = c.encoded_size[2]
 
 function render(c::ImgCanvas)
-  if ImageInTerminal.use_sixel(c.img)
-    c.sixel[] = true
-    lines = String[]
-    h, w = size(c.img)
-    char_pixels = ImageInTerminal.Sixel.TerminalTools.query_terminal("\e[16t", r"\e\[6;(\d+);(\d+)t", stdout)
-    char_h, char_w = length(char_pixels) > 1 ? parse.(Int, char_pixels) : (15, 7)
-    for r ∈ 1:char_h:h
-      io = IOBuffer()
-      ImageInTerminal.sixel_encode(io, c.img[r:min(r + char_h - 1, h), :])
-      push!(lines, String(take!(io)))
+    if ImageInTerminal.use_sixel(c.img)
+        c.sixel[] = true
+        h, w = size(c.img)
+        # determine the terminal carret size, in pixels
+        char_pixels = ImageInTerminal.Sixel.TerminalTools.query_terminal("\e[16t", r"\e\[6;(\d+);(\d+)t", stdout)
+        char_h, char_w = length(char_pixels) > 1 ? parse.(Int, char_pixels) : (15, 7)
+        lines = String[]
+        io = IOBuffer()
+        for r ∈ 1:char_h:h
+            ImageInTerminal.sixel_encode(io, c.img[r:min(r + char_h - 1, h), :])
+            push!(lines, String(take!(io)))
+        end
+        enc_size = length(lines), ceil(Int, w / char_w)
+    else
+        io = PipeBuffer()
+        ImageInTerminal.imshow(io, c.img)
+        lines = readlines(io)
+        enc_size = length(lines), length(replace(first(lines), r"\x1B\[[0-9;]*[a-zA-Z]" => ""))
     end
-    copyto!(c.encoded_size, [length(lines), ceil(Int, w / char_w)])
-  else
-    io = PipeBuffer()
-    ImageInTerminal.imshow(io, c.img, ImageInTerminal.colormode[1])
-    lines = readlines(io)
-    copyto!(c.encoded_size, [length(lines), length(replace(first(lines), r"\x1B\[[0-9;]*[a-zA-Z]" => ""))])
-  end
-  resize!(c.ren, nrows(c))
-  copyto!(c.ren, lines)
-  c
+    copyto!(c.encoded_size, enc_size)
+    resize!(c.ren, nrows(c))
+    copyto!(c.ren, lines)
+    c
 end
 
 function printrow(io::IO, c::ImgCanvas, row::Int)