Commands refactor (#257)

* remove unecessary check

* move command registration to core/commands

data/core/commands/dialog.lua

@@ -0,0 +1,34 @@
+local core = require "core"
+local command = require "core.command"
+
+command.add("core.nagview", {
+  ["dialog:previous-entry"] = function()
+    local v = core.active_view
+    local hover = v.hovered_item or 1
+    v:change_hovered(hover == 1 and #v.options or hover - 1)
+  end,
+  ["dialog:next-entry"] = function()
+    local v = core.active_view
+    local hover = v.hovered_item or 1
+    v:change_hovered(hover == #v.options and 1 or hover + 1)
+  end,
+  ["dialog:select-yes"] = function()
+    local v = core.active_view
+    if v ~= core.nag_view then return end
+    v:change_hovered(findindex(v.options, "default_yes"))
+    command.perform "dialog:select"
+  end,
+  ["dialog:select-no"] = function()
+    local v = core.active_view
+    if v ~= core.nag_view then return end
+    v:change_hovered(findindex(v.options, "default_no"))
+    command.perform "dialog:select"
+  end,
+  ["dialog:select"] = function()
+    local v = core.active_view
+    if v.hovered_item then
+      v.on_selected(v.options[v.hovered_item])
+      v:next()
+    end
+  end
+})