japanese-srs-trainer-wanikani/awesome/src/modules/application_launcher/application.lua

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-- This is the application launcher --
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-- Awesome Libs
local awful = require("awful")
local dpi = require("beautiful").xresources.apply_dpi
local desktop_parser = require("src.tools.desktop_parser")
local gears = require("gears")
local wibox = require("wibox")

return function()

  local desktop_files = desktop_parser.Get_all_visible_desktop()

  local application_grid = wibox.widget {
    homogenous = true,
    expand = false,
    spacing = dpi(10),
    id = "grid",
    forced_num_cols = 8,
    forced_num_rows = 7,
    orientation = "vertical",
    layout = wibox.layout.grid
  }
  -- Selected application position, default is first at 1,1
  -- The typo *might* be intentional
  local curser = {
    x = 1,
    y = 1
  }

  local filter = ""

  ---Executes only once to create a widget from each desktop file
  ---@return table widgets Unsorted widget table
  local function get_applications_from_file()
    local list = {}
    for _, file in ipairs(desktop_files) do
      if not file.nodisplay then
        local app_widget = wibox.widget {
          {
            {
              {
                {
                  { -- Icon
                    valign = "center",
                    halign = "center",
                    image = xdg_icon_lookup:find_icon(file.icon, 64) or "/home/crylia/Bilder/yes.png",
                    resize = true,
                    widget = wibox.widget.imagebox
                  },
                  height = dpi(64),
                  width = dpi(64),
                  strategy = "exact",
                  widget = wibox.container.constraint
                },
                {
                  { -- Name
                    text = file.name,
                    align = "center",
                    valign = "center",
                    widget = wibox.widget.textbox
                  },
                  strategy = "exact",
                  width = dpi(170),
                  -- Prevents widget from overflowing
                  height = dpi(40),
                  widget = wibox.container.constraint
                },
                layout = wibox.layout.fixed.vertical
              },
              halign = "center",
              valign = "center",
              widget = wibox.container.place
            },
            margins = dpi(10),
            widget = wibox.container.margin
          },
          name = file.name,
          comment = file.comment,
          exec = file.exec,
          keywords = file.keywords,
          categories = file.categories,
          terminal = file.terminal,
          border_color = Theme_config.application_launcher.application.border_color,
          border_width = Theme_config.application_launcher.application.border_width,
          bg = Theme_config.application_launcher.application.bg,
          shape = function(cr, width, height)
            gears.shape.rounded_rect(cr, width, height, dpi(8))
          end,
          widget = wibox.container.background
        }

        -- Execute command on left click and hide launcher
        app_widget:buttons(
          gears.table.join(
            awful.button(
              {},
              1,
              nil,
              function()
                awful.spawn.with_shell(file.exec)
                awesome.emit_signal("application_launcher::show")
              end
            )
          )
        )
        table.insert(list, app_widget)
      end
    end
    return list
  end

  -- Table to hold all application widgets unsorted
  local application_list = get_applications_from_file()

  ---Function to filter the applications and sort them into a widget grid
  ---@param search_filter string Filter string from the searchbar
  ---@return wibox.layout.grid wibox.layout.grid Sorted grid with all applications matching the filter
  local function get_applications(search_filter)
    filter = search_filter or filter
    --Clear grid from previous widgets
    application_grid:reset()
    -- Reset to first position
    curser = {
      x = 1,
      y = 1
    }
    for _, application in ipairs(application_list) do
      -- Match the filter
      if string.match(string.lower(application.name), string.lower(filter)) or
          string.match(string.lower(application.categories), string.lower(filter)) or
          string.match(string.lower(application.keywords), string.lower(filter)) then
        application_grid:add(application)

        -- Get the current position in the grid of the application as a table
        local pos = application_grid:get_widget_position(application)

        -- Check if the curser is currently at the same position as the application
        awesome.connect_signal(
          "update::selected",
          function()
            if curser.y == pos.row and curser.x == pos.col then
              application.border_color = Theme_config.application_launcher.application.border_color_active
            else
              application.border_color = Theme_config.application_launcher.application.border_color
            end
          end
        )
        awesome.emit_signal("update::selected")
        Hover_signal(application, Theme_config.application_launcher.application.bg,
          Theme_config.application_launcher.application.fg, application.border_color)
      end
    end

    return application_grid
  end

  application_grid = get_applications(filter)

  awesome.connect_signal(
    "application::left",
    function()
      curser.x = curser.x - 1
      if curser.x < 1 then
        curser.x = 1
      end
      awesome.emit_signal("update::selected")
    end
  )

  awesome.connect_signal(
    "application::right",
    function()
      curser.x = curser.x + 1
      local _, grid_cols = application_grid:get_dimension()
      if curser.x > grid_cols then
        curser.x = grid_cols
      end
      awesome.emit_signal("update::selected")
    end
  )

  awesome.connect_signal(
    "application::up",
    function()
      curser.y = curser.y - 1
      if curser.y < 1 then
        curser.y = 1
      end
      awesome.emit_signal("update::selected")
    end
  )

  awesome.connect_signal(
    "application::down",
    function()
      curser.y = curser.y + 1
      local grid_rows, _ = application_grid:get_dimension()
      if curser.y > grid_rows then
        curser.y = grid_rows
      end
      awesome.emit_signal("update::selected")
    end
  )

  awesome.connect_signal(
    "update::application_list",
    function(filter)
      application_grid = get_applications(filter)
    end
  )

  awesome.connect_signal(
    "application_launcher::execute",
    function()
      awesome.emit_signal("searchbar::stop")

      local selected_widget = application_grid:get_widgets_at(curser.y, curser.x)[1]
      if selected_widget.terminal then
        awful.spawn.with_shell(selected_widget.exec)
      else
        awful.spawn(selected_widget.exec)
      end
    end
  )

  return application_grid
end