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wget/TODO

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1999-12-02 02:42:23 -05:00
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 things it'd be nice to see in
Wget. Patches to implement any of these items would be gladly accepted. The
items are not listed in any particular order (except that recently-added items
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may tend towards the top). Not all of these represent user-visible
changes.
* -p should probably go "_two_ more hops" on <FRAMESET> pages.
* Only normal link-following recursion should respect -np. Page-requisite
recursion should not. When -np -p is specified, Wget should still retrieve
requisite images and such on the server, even if they aren't in that directory
or a subdirectory of it. Likewise, -H -np -p should retrieve requisite files
from other hosts.
* 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.
* Limit the number of successive redirection to max. 20 or so.
* 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.
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* 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.
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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.
* 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.