bling/helpers/icon_theme.lua

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-- @author https://github.com/Kasper24
-- @copyright 2021-2022 Kasper24
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local lgi = require("lgi")
local Gio = lgi.Gio
local DesktopAppInfo = Gio.DesktopAppInfo
local AppInfo = Gio.DesktopAppInfo
local Gtk = lgi.require("Gtk", "3.0")
local string = string
local ipairs = ipairs

local ICON_SIZE = 48
local GTK_THEME = Gtk.IconTheme.get_default()

local _icon_theme = {}

function _icon_theme.choose_icon(icons_names, icon_theme, icon_size)
    if icon_theme then
        GTK_THEME = Gtk.IconTheme.new()
        Gtk.IconTheme.set_custom_theme(GTK_THEME, icon_theme);
    end
    if icon_size then
        ICON_SIZE = icon_size
    end

    local icon_info = GTK_THEME:choose_icon(icons_names, ICON_SIZE, 0);
    if icon_info then
        local icon_path = icon_info:get_filename()
        if icon_path then
            return icon_path
        end
    end

    return ""
end

function _icon_theme.get_gicon_path(gicon, icon_theme, icon_size)
    if gicon == nil then
        return ""
    end

    if icon_theme then
        GTK_THEME = Gtk.IconTheme.new()
        Gtk.IconTheme.set_custom_theme(GTK_THEME, icon_theme);
    end
    if icon_size then
        ICON_SIZE = icon_size
    end

    local icon_info = GTK_THEME:lookup_by_gicon(gicon, ICON_SIZE, 0);
    if icon_info then
        local icon_path = icon_info:get_filename()
        if icon_path then
            return icon_path
        end
    end

    return ""
end

function _icon_theme.get_icon_path(icon_name, icon_theme, icon_size)
    if icon_theme then
        GTK_THEME = Gtk.IconTheme.new()
        Gtk.IconTheme.set_custom_theme(GTK_THEME, icon_theme);
    end
    if icon_size then
        ICON_SIZE = icon_size
    end

    local icon_info = GTK_THEME:lookup_icon(icon_name, ICON_SIZE, 0)
    if icon_info then
        local icon_path = icon_info:get_filename()
        if icon_path then
            return icon_path
        end
    end

    return ""
end

function _icon_theme.get_client_icon_path(client, icon_theme, icon_size)
    local app_list = AppInfo.get_all()

    local class = string.lower(client.class)
    local name = string.lower(client.name)

    for _, app in ipairs(app_list) do
        local id = app:get_id()
        local desktop_app_info = DesktopAppInfo.new(id)
        if desktop_app_info then
            local props = {
                string.lower(desktop_app_info:get_string("Name") or ""),
                string.lower(desktop_app_info:get_filename() or ""),
                string.lower(desktop_app_info:get_startup_wm_class() or ""),
                string.lower(desktop_app_info:get_string("Icon") or ""),
                string.lower(desktop_app_info:get_string("Exec") or ""),
                string.lower(desktop_app_info:get_string("Keywords") or "")
            }

            for _, prop in ipairs(props) do
                if prop ~= "" and (prop == class or prop == name) then
                    local icon = desktop_app_info:get_string("Icon")
                    return _icon_theme.get_icon_path(icon, icon_theme, icon_size)
                end
            end
        end
    end

    return _icon_theme.choose_icon({"window", "window-manager", "xfwm4-default", "window_list"}, icon_theme, icon_size)
end

return _icon_theme