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--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015-2020, TBOOX Open Source Group.
--
-- @author OpportunityLiu
-- @file progress.lua
--
-- imports
import('core.base.object')
import('core.theme.theme')
-- print back characters
function _make_clearchars(backnum)
if backnum > 0 then
return ('\b'):rep(backnum) .. (' '):rep(backnum) .. ('\b'):rep(backnum)
end
return ''
end
-- define module
local process = process or object { _init = { "_RUNNING", "_INDEX", "_STREAM", "_OPT", "_CLEAR" } }
-- stop the progress indicator, clear written frames
function process:stop()
if self._RUNNING ~= 0 then
self:clear()
self._RUNNING = 0
self._INDEX = 0
end
end
function process:_clear()
if self._RUNNING == 1 then
self._STREAM:write(self._CLEAR)
self._RUNNING = 2
return true
end
end
-- clear previous frame of the progress indicator
function process:clear()
if self:_clear() then
self._STREAM:flush()
end
end
-- write next frame of the progress indicator
function process:write()
local chars = self._OPT.chars[self._INDEX % #self._OPT.chars + 1]
self:_clear()
self._STREAM:write(chars)
self._STREAM:flush()
self._INDEX = self._INDEX + 1
self._RUNNING = 1
end
-- check if the progress indicator is running
function process:running()
return self._RUNNING and true or false
end
-- build a progress indicator
-- @params stream - stream to write to, will use io.stdout if not provided
-- @params opt - options
-- - chars - an array of chars for progress indicator
-- - width - width of progress indicator, will use #opt.chars[1] if not provided
function new(stream, opt)
-- set default values
stream = stream or io.stdout
opt = opt or {}
if opt.chars == nil or #opt.chars == 0 then
opt.chars = theme.get("text.spinner.chars")
opt.width = 2
end
opt.width = opt.width or #opt.chars[1]
return process { _OPT = opt, _STREAM = stream, _RUNNING = 0, _INDEX = 0, _CLEAR = _make_clearchars(opt.width) }
end
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