minetest/builtin/mainmenu/content/screenshots.lua

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--Minetest
--Copyright (C) 2023-24 rubenwardy
--
--This program is free software; you can redistribute it and/or modify
--it under the terms of the GNU Lesser General Public License as published by
--the Free Software Foundation; either version 2.1 of the License, or
--(at your option) any later version.
--
--This program is distributed in the hope that it will be useful,
--but WITHOUT ANY WARRANTY; without even the implied warranty of
--MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
--GNU Lesser General Public License for more details.
--
--You should have received a copy of the GNU Lesser General Public License along
--with this program; if not, write to the Free Software Foundation, Inc.,
--51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-- Screenshot
local screenshot_dir = core.get_cache_path() .. DIR_DELIM .. "cdb"
assert(core.create_dir(screenshot_dir))
local screenshot_downloading = {}
local screenshot_downloaded = {}
local function get_file_extension(path)
local parts = path:split(".")
return parts[#parts]
end
function get_screenshot(package)
if not package.thumbnail then
return defaulttexturedir .. "no_screenshot.png"
elseif screenshot_downloading[package.thumbnail] then
return defaulttexturedir .. "loading_screenshot.png"
end
-- Get tmp screenshot path
local ext = get_file_extension(package.thumbnail)
local filepath = screenshot_dir .. DIR_DELIM ..
("%s-%s-%s.%s"):format(package.type, package.author, package.name, ext)
-- Return if already downloaded
local file = io.open(filepath, "r")
if file then
file:close()
return filepath
end
-- Show error if we've failed to download before
if screenshot_downloaded[package.thumbnail] then
return defaulttexturedir .. "error_screenshot.png"
end
-- Download
local function download_screenshot(params)
return core.download_file(params.url, params.dest)
end
local function callback(success)
screenshot_downloading[package.thumbnail] = nil
screenshot_downloaded[package.thumbnail] = true
if not success then
core.log("warning", "Screenshot download failed for some reason")
end
ui.update()
end
if core.handle_async(download_screenshot,
{ dest = filepath, url = package.thumbnail }, callback) then
screenshot_downloading[package.thumbnail] = true
else
core.log("error", "ERROR: async event failed")
return defaulttexturedir .. "error_screenshot.png"
end
return defaulttexturedir .. "loading_screenshot.png"
end