ref(calendar): refactored view outside of calendar module (#815)

Co-authored-by: Andrea <andrea@DESKTOP-RPJDAO0.localdomain>

lua/neorg/modules/core/ui/calendar/module.lua

@@ -0,0 +1,171 @@
+-- NOTICE: Consider this whole module a demo for now
+-- A lot of stuff is hardcoded in order to prove that it can work
+
+local module = neorg.modules.create("core.ui.calendar")
+
+module.setup = function()
+    return {
+        requires = {
+            "core.ui",
+            "core.ui.calendar.views.monthly"
+        },
+    }
+end
+
+module.private = {
+
+    modes = {},
+    views = {},
+
+    get_mode = function(name, callback)
+        if module.private.modes[name] ~= nil then
+            local cur_mode = module.private.modes[name](callback)
+            cur_mode.name = name
+            return cur_mode
+        end
+
+        print("Error: mode not set or not available")
+    end,
+
+    get_view = function(name)
+        if module.private.views[name] ~= nil then
+            return module.private.views[name]
+        end
+
+        print("Error: view not set or not available")
+    end,
+
+    extract_ui_info = function (buffer, window)
+        local width = vim.api.nvim_win_get_width(window)
+        local height = vim.api.nvim_win_get_height(window)
+
+        local half_width = math.floor(width / 2)
+        local half_height = math.floor(height / 2)
+
+        return {
+            window = window,
+            buffer = buffer,
+            width = width,
+            height = height,
+            half_width = half_width,
+            half_height = half_height,
+        }
+    end,
+
+    open_window = function (options)
+        local buffer, window = module.required["core.ui"].create_split(
+            "calendar",
+            {},
+            options.height or math.floor(vim.opt.lines:get() * 0.3)
+        )
+
+        return buffer, window
+    end
+}
+
+module.public = {
+    add_mode = function(name, factory)
+        module.private.modes[name] = factory
+    end,
+
+    add_view = function(name, details)
+        module.private.views[name] = details
+    end,
+
+    create_calendar = function(buffer, window, options)
+        local callback_and_close = function (result)
+            if options.callback ~= nil then
+                options.callback(result)
+            end
+
+            module.required['core.ui'].delete_window(buffer)
+        end
+
+        local mode = module.private.get_mode(options.mode, callback_and_close)
+        if mode == nil then
+            return
+        end
+
+        local ui_info = module.private.extract_ui_info(buffer, window)
+
+        local view = module.private.get_view(options.view or "monthly")
+
+        view.setup(ui_info, mode, options)
+    end,
+
+    open = function(options)
+        local buffer, window = module.private.open_window(options)
+
+        options.mode = "standalone"
+
+        return module.public.create_calendar(buffer, window, options)
+    end,
+
+    select_date = function(options)
+        local buffer, window = module.private.open_window(options)
+
+        options.mode = "select_date"
+
+        return module.public.create_calendar(buffer, window, options)
+    end,
+
+    select_date_range = function(options)
+        local buffer, window = module.private.open_window(options)
+
+        options.mode = "select_range"
+
+        return module.public.create_calendar(buffer, window, options)
+    end,
+}
+
+module.load = function()
+    -- Add default calendar modes
+    module.public.add_mode("standalone", function(_)
+        return {}
+    end)
+
+    module.public.add_mode("select_date", function(callback)
+        return {
+            on_select = function(_, date)
+                if callback then
+                    callback(date)
+                end
+                return false
+            end,
+        }
+    end)
+
+    module.public.add_mode("select_range", function(callback)
+        return {
+            range_start = nil,
+            range_end = nil,
+
+            on_select = function(self, date)
+                if not self.range_start then
+                    self.range_start = date
+                    return true
+                else
+                    if os.time(date) <= os.time(self.range_start) then
+                        print("Error: you should choose a date that is after the starting day.")
+                        return false
+                    end
+
+                    self.range_end = date
+                    callback({ self.range_start, self.range_end })
+                    return false
+                end
+            end,
+
+            get_day_highlight = function(self, date, default_highlight)
+                if self.range_start ~= nil then
+                    if os.time(date) < os.time(self.range_start) then
+                        return "@comment"
+                    end
+                end
+                return default_highlight
+            end,
+        }
+    end)
+end
+
+return module