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wget/TODO

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Hey Emacs, this is -*- outline -*- mode
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This is the to-do list for GNU Wget. There is no timetable of when we
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plan to implement these features -- this is just a list of features
we'd like to see in Wget, as well as a list of problems that need
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fixing. Patches to implement these items are likely to be accepted,
especially if they follow the coding convention outlined in PATCHES
and if they patch the documentation as well.
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The items are not listed in any particular order (except that
recently-added items may tend towards the top). Not all of these
represent user-visible changes.
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* Honor `Content-Disposition: XXX; filename="FILE"' when creating the
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file name. If possible, try not to break `-nc' and friends when
doing that.
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* Wget shouldn't delete rejected files that were not downloaded, but
just found on disk because of `-nc'. For example, `wget -r -nc
-A.gif URL' should allow the user to get all the GIFs without
removing any of the existing HTML files.
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* Be careful not to lose username/password information given for the
URL on the command line.
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* Add a --range parameter allowing you to explicitly specify a range
of bytes to get from a file over HTTP (FTP only supports ranges
ending at the end of the file, though forcibly disconnecting from
the server at the desired endpoint might be workable).
* If multiple FTP URLs are specified that are on the same host, Wget should
re-use the connection rather than opening a new one for each file.
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* Try to devise a scheme so that, when password is unknown, Wget asks
the user for one.
* If -c used with -N, check to make sure a file hasn't changed on the server
before "continuing" to download it (preventing a bogus hybrid file).
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* Generalize --html-extension to something like --mime-extensions and
have it look at mime.types/mimecap file for preferred extension.
Non-HTML files with filenames changed this way would be
re-downloaded each time despite -N unless .orig files were saved for
them. Since .orig would contain the same data as non-.orig, the
latter could be just a link to the former. Another possibility
would be to implement a per-directory database called something like
.wget_url_mapping containing URLs and their corresponding filenames.
* When spanning hosts, there's no way to say that you are only interested in
files in a certain directory on _one_ of the hosts (-I and -X apply to all).
Perhaps -I and -X should take an optional hostname before the directory?
* --retr-symlinks should cause wget to traverse links to directories too.
* Make wget return non-zero status in more situations, like incorrect HTTP auth.
* Make -K compare X.orig to X and move the former on top of the latter if
they're the same, rather than leaving identical .orig files laying around.
* Make `-k' check for files that were downloaded in the past and convert links
to them in newly-downloaded documents.
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* Add option to clobber existing file names (no `.N' suffixes).
* Add option to only list wildcard matches without doing the download.
* Handle MIME types correctly. There should be an option to (not)
retrieve files based on MIME types, e.g. `--accept-types=image/*'.
* Allow time-stamping by arbitrary date.
* Allow size limit to files (perhaps with an option to download oversize files
up through the limit or not at all, to get more functionality than [u]limit.
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* Download to .in* when mirroring.
* Add an option to delete or move no-longer-existent files when mirroring.
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* Implement uploading (--upload URL?) in FTP and HTTP.
* Rewrite FTP code to allow for easy addition of new commands. It
should probably be coded as a simple DFA engine.
* Make HTTP timestamping use If-Modified-Since facility.
* Add more protocols (e.g. gopher and news), implementing them in a
modular fashion.
* Add a "rollback" option to have continued retrieval throw away a
configurable number of bytes at the end of a file before resuming
download. Apparently, some stupid proxies insert a "transfer
interrupted" string we need to get rid of.