feat(download): 批量下载时跳过已下载的文件并支持手动停止 - #94
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wuziqian211 merged 1 commit intoSep 26, 2026
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批量下载整套课本时，若上一轮有部分文件下载失败，重新下载会把已经下载好的 文件再下一遍（并生成 “xxx (2).pdf”），导致总也下不完一整套；下载开始后也 没有停止的办法。 - 路径分配不再把 “已存在的目标文件” 当作命名冲突，批量下载时直接跳过该文件， 只下载缺失与上次失败的资源；进度标签与结束提示中显示跳过数量。 单文件下载仍由保存对话框确认覆盖，不受影响。 - 下载期间 “下载” 按钮变为 “停止下载”：排队中的任务不再发起请求，正在传输的 任务立即收尾并删除未完成的 .tmp 文件，已完成的文件保留。 close happycola233#92
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做了什么
xxx (2).pdf），而是直接跳过，只下载缺失与上次失败的资源。跳过数量会显示在进度标签和结束提示中。单文件下载仍由保存对话框确认覆盖，行为不变。.tmp文件，已下载完成的文件保留，结束提示改为 “下载已停止”。为什么
#92 反映了两个实际问题：整套课本里总有部分文件下载失败，重新下载时已下载好的文件又被下一遍，「总下不完全套」；并且下载开始后无法停止。
由于临时文件重命名是下载的最后一步，目标文件存在即说明上一轮已完整下载，可以安全跳过；
.tmp仍然要避开，因为它可能属于另一个正在运行的程序实例。如何验证
tests/test_download_batch.py新增 3 个测试：只下载缺失的文件、整批已下载时不启动线程、停止后保留已完成文件并清掉未完成的.tmp；tests/test_download_paths.py中已完成文件的路径断言随行为更新。99 passed（unittest 运行tests/全部用例）。flake8 src tests --select=E9,F63,F7,F82输出 0。close #92