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wget/TODO
2001-12-01 11:04:30 -08:00

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Hey Emacs, this is -*- outline -*- mode
This is the to-do list for Wget. There is no timetable of when we
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
fixing. Patches to implement these items are likely to be accepted.
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.
* Should allow retries with multiple downloads when using -O on
regular files. As the source comment says: "A possible solution to
[rewind not working with multiple downloads] would be to remember
the file position in the output document and to seek to that
position, instead of rewinding."
* 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.
* Be careful not to lose username/password information given for the
URL on the command line.
* Support FWTK firewalls. It should work like this: if ftp_proxy is
set to an ftp URL, Wget should assume the use of an FWTK firewall.
It should connect to the proxy URL, log in as username@target-site,
and continue as usual.
* 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.
* 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).
* 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?
* Add an option to not encode special characters like ' ' and '~' when saving
local files. Would be good to have a mode that encodes all special characters
(as now), one that encodes none (as above), and one that only encodes a
character if it was encoded in the original URL (e.g. %20 but not %7E).
* --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.
* Add option to clobber existing file names (no `.N' suffixes).
* Introduce a concept of "boolean" options. For instance, every
boolean option `--foo' would have a `--no-foo' equivalent for
turning it off. Get rid of `--foo=no' stuff. Short options would
be handled as `-x' vs. `-nx'.
* Add option to only list wildcard matches without doing the download.
* Add case-insensitivity as an option.
* Handle MIME types correctly. There should be an option to (not)
retrieve files based on MIME types, e.g. `--accept-types=image/*'.
* Implement "persistent" retrieving. In "persistent" mode Wget should
treat most of the errors as transient.
* 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.
* Download to .in* when mirroring.
* Add an option to delete or move no-longer-existent files when mirroring.
* 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.
* Implement better spider options.
* Add more protocols (e.g. gopher and news), implementing them in a
modular fashion.
* Implement a concept of "packages" a la mirror.
* 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.
* When using --accept and --reject, you can end up with empty directories. Have
Wget any such at the end.