say in own library

src/lib/macOS_say.lua

@@ -0,0 +1,36 @@
+local log = require "lib.log"
+local utility = require "lib.utility"
+
+local voices = utility.load_data("macos_say-en.json")
+
+local say_thread = love.thread.newThread([[
+  local channel = love.thread.getChannel("say")
+  while true do
+    local message = channel:demand()
+    if message then
+      os.execute("say -v " .. message.voice .. " " .. message.line)
+    end
+  end
+]])
+say_thread:start()
+
+return setmetatable({
+  update = function()
+    local thread_error = say_thread:getError()
+    if thread_error then
+      log("error", thread_error)
+    end
+  end,
+}, {
+  __call = function(self, line)
+    local selected_voice = voices[math.random(1, #voices)]
+
+    local say_channel = love.thread.getChannel("say")
+    line = line or "Hello, my name is " .. selected_voice .. "."
+    say_channel:push({
+      voice = selected_voice:enquote(),
+      line = line:enquote(),
+    })
+    log("say", selected_voice, line)
+  end,
+})