ui: forward relevant option updates to UIs (#7520)

also make termguicolors mutable after startup

2 files changed, 71 insertions, 0 deletions

diff --git a/test/functional/ui/options_spec.lua b/test/functional/ui/options_spec.lua
new file mode 100644
index 0000000000..14f40b3ec1
--- /dev/null
+++ b/test/functional/ui/options_spec.lua
@@ -0,0 +1,66 @@
+local helpers = require('test.functional.helpers')(after_each)
+local Screen = require('test.functional.ui.screen')
+local clear = helpers.clear
+local command = helpers.command
+local eq = helpers.eq
+
+describe('ui receives option updates', function()
+  local screen
+
+  before_each(function()
+    clear()
+    screen = Screen.new(20,5)
+    screen:attach()
+  end)
+
+  after_each(function()
+    screen:detach()
+  end)
+
+  local defaults = {
+    ambiwidth='single',
+    arabicshape=true,
+    emoji=true,
+    guifont='',
+    guifontset='',
+    guifontwide='',
+    showtabline=1,
+    termguicolors=false,
+  }
+
+  it("for defaults", function()
+    screen:expect(function()
+      eq(defaults, screen.options)
+    end)
+  end)
+
+  it("when setting options", function()
+    local changed = {}
+    for k,v in pairs(defaults) do
+      changed[k] = v
+    end
+
+    command("set termguicolors")
+    changed.termguicolors = true
+    screen:expect(function()
+      eq(changed, screen.options)
+    end)
+
+    command("set guifont=Comic\\ Sans")
+    changed.guifont = "Comic Sans"
+    screen:expect(function()
+      eq(changed, screen.options)
+    end)
+
+    command("set showtabline=0")
+    changed.showtabline = 0
+    screen:expect(function()
+      eq(changed, screen.options)
+    end)
+
+    command("set all&")
+    screen:expect(function()
+      eq(defaults, screen.options)
+    end)
+  end)
+end)
diff --git a/test/functional/ui/screen.lua b/test/functional/ui/screen.lua
index 075d8c40d7..696feabeed 100644
--- a/test/functional/ui/screen.lua
+++ b/test/functional/ui/screen.lua
@@ -137,6 +137,7 @@ function Screen.new(width, height)
     visual_bell = false,
     suspended = false,
     mode = 'normal',
+    options = {},
     _default_attr_ids = nil,
     _default_attr_ignore = nil,
     _mouse_enabled = true,
@@ -482,6 +483,10 @@ function Screen:_handle_set_icon(icon)
   self.icon = icon
 end
 
+function Screen:_handle_option_set(name, value)
+  self.options[name] = value
+end
+
 function Screen:_clear_block(top, bot, left, right)
   for i = top, bot do
     self:_clear_row_section(i, left, right)