controller.lua
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controller.lua
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	local window = require "ivy.window"
	local prompt = require "ivy.prompt"

	local controller = {}

	controller.items = nil
	controller.callback = nil

	controller.run = function(name, items, callback)
	controller.callback = callback
	controller.items = items

	window.initialize()
	window.set_items { "-- Loading ---" }
	vim.api.nvim_buf_set_name(window.get_buffer(), name)

	controller.input ""
	end

	controller.input = function(char)
	prompt.input(char)
	vim.schedule(function()
	window.set_items(controller.items(prompt.text()))
	end)
	end

	controller.search = function(value)
	prompt.set(value)
	vim.schedule(function()
	window.set_items(controller.items(prompt.text()))
	end)
	end

	controller.complete = function()
	controller.checkpoint()
	controller.destroy()
	end

	controller.checkpoint = function()
	vim.api.nvim_set_current_win(window.previous)
	controller.callback(window.get_current_selection())
	vim.api.nvim_set_current_win(window.window)
	end

	controller.next = function()
	window.index = window.index + 1
	window.update()
	end

	controller.previous = function()
	window.index = window.index - 1
	window.update()
	end

	controller.destroy = function()
	controller.items = nil
	controller.callback = nil

	window.destroy()
	prompt.destroy()
	end

	return controller