@node Usage
@unnumbered Usage

How @strong{I} use it:

@table @asis

@item Get its source code

@example
$ git clone git://git.stargrave.org/feeder.git
$ cd feeder
@end example

@item Compile @command{feed2mdir} utility

@example
$ ( cd cmd/feed2mdir ; go build )
@end example

@item Create feeds state directories

You can create feeds subdirectories under @file{feeds/} manually:

@example
$ mkdir -p feeds/my_first_feed/@{cur,new,tmp@}
$ echo http://example.com/feed.atom > feeds/my_first_feed/url
@end example

or convert Newsboat @file{urls} file (containing many lines with URLs)
with @command{urls2feeds.zsh} to subdirectories hierarchy:

@example
$ ./urls2feeds.zsh < ~/.newsboat/urls
$ cat feeds/blog.stargrave.org_russian_feed.atom/url
http://blog.stargrave.org/russian/feed.atom
@end example

@command{urls2feeds.zsh} won't touch already existing directories and will
warn if some of them disappeared from @file{urls}.

@item Download your feed(s) data

@example
$ cmd/download.sh feeds/blog.stargrave.org_russian_feed.atom
$ ./feeds-download.zsh # to invoke parallel downloading of everything
@end example

Probably you want to change its default @env{$PROXY} value. It uses
@command{curl}, that is aware of @code{If-Modified-Since} and
@code{ETag} headers, compressed content encodings and HTTP redirections.
If you want to see verbose output, then set @env{FEEDER_CURL_VERBOSE=1}.

@item Parse your feeds

@example
$ cmd/parse.sh feeds/blog.stargrave.org_russian_feed.atom
$ ./feeds-parse.zsh # to parse all feeds in parallel
@end example

@item Quick overview of the news:

@example
$ ./feeds-news.zsh
habr.com_ru_rss_interesting: 7
habr.com_ru_rss_news: 3
lobste.rs_rss: 3
naked-science.ru_?yandex_feed=news: 1
planet.fsfe.org_atom.xml: 1
www.astronews.ru_astronews.xml: 1
www.darkside.ru_news_rss: 5
@end example

@item Run Mutt

@example
$ ./feeds-browse.zsh
@end example

That will read all feeds titles and create @file{mutt.rc} sourceable
configuration file with predefined helpers and @code{mailboxes}
commands. Mutt will be started in mailboxes browser mode (I will skip
many entries):

@verbatim
  1   N [  1|101] 2021-02-17 20:41 Cryptology ePrint Archive/
  3     [  0|  8] 2021-12-02 19:28 Thoughts/
 32     [  0|  8] 2021-02-17 19:32 apenwarr/
101     [ 10| 50] 2021-02-14 13:40 Блог Stargrave на русском comments/
102     [  0| 51] 2021-02-17 19:37 Блог Stargrave на русском/
316     [  0| 44] 2021-02-17 19:33 Eaten By A Grue: Infocom, Text Adventures, and Interactive Fiction/
@end verbatim

ePrint has new entries since last downloading/parsing. Stargrave's blog
comments have nothing new, but still ten unread entries.

If we open "Eaten By A Grue" mailbox, then will see its entries:

@verbatim
   1     [2021-01-30 11:00] Zork Zero: The Revenge of Megaboz (0,8K)
   2     [2021-06-12 11:01] Journey: The Quest Begins (0,8K)
   3     [2021-04-28 11:00] Eaten By A Cruise (0,8K)
[...]
---Mutt: feeds/monsterfeet.com_grue.rss [Nachr:44 60K]---
@end verbatim

@item Press @code{q} to return to mailbox browser again

This is made for convenience, because you will often switch your
mailboxes (feeds), but @code{q} quits Mutt by default.

@item Press @code{A} to mark all messages read

And again this is made for convenience. It will mark both new
(@strong{N}) and old-but-unread (@strong{O}) messages as read. You will
see left tag-marks near each message to understand what was touched.

@item Press @code{o} to open links and enclosures URLs

Do it in pager mode and you message will be piped to
@command{cmd/x-urlview.sh}, that will show all @code{X-URL}
and @code{X-Enclosure} links.

@item Index your messages

@example
$ ./feeds-index.sh
@end example

That will create @file{mu/} and @file{search/} directories and run
@command{mu index} indexing, that is safely can be done incrementally
after each download/parse cycle.

@item Search something

Press @code{<F8>} in Mutt's index and enter your mu/Xapian search query.
Let's search for articles mentioning
@url{https://en.wikipedia.org/wiki/Planetfall, Planetfall} during
2019-2021 period: @code{Planetfall date:2019..2021}. @command{mu} will
create symbolic links in @file{search/} subdirectory to the message. Press
@code{<F9>} to switch that mailbox:

@verbatim
   1 [2021-12-20 07:08] Missed Classic: Stationfall - When Food Dispensers Attack (The Adventurers Guild)
   2 [2021-11-20 04:52] Missed Classic 102: Stationfall - Introduction (1987) (The Adventurers Guild)
   3 [2021-11-19 17:54] Boffo Games (The Digital Antiquarian)
   4 [2021-10-30 23:05] Missed Classic 100: The Manhole (1988) (The Adventurers Guild)
   5 [2020-05-17 22:16] Round 04 Reveal (unWinnable State)
   6 [2020-05-16 22:29] Round 03 Reveal (unWinnable State)
   7 [2020-04-20 11:00] Planetfall (Eaten By A Grue: Infocom, Text Adventures, and Interactive Fiction)
   8 [2020-04-09 11:00] Beyond Zork (Eaten By A Grue: Infocom, Text Adventures, and Interactive Fiction)
-%-Mutt: =search [Nachr:8 215K]---
@end verbatim

Pay attention that there is different index format, lacking unnecessary
message flags display and adding name of the feed in parenthesis.

@item Cleanup excess number of messages

@example
$ ./feeds-clear.zsh
@end example

That will remove all messages in all feeds @file{cur/} directory that is
not first hundred of ones, ordered by @code{mtime}. Pay attention that
@file{new/} directory is not touched, so you won't loose completely new
and unread messages when you are on vacation and left @command{cron}-ed
workers. @command{cmd/feed2mdir/feed2mdir} command by default has
@option{-max-entries 100} option set.

@item If you want to clean download state

@example
$ cmd/download-clean.sh feed/FEED
@end example

@anchor{Enclosures}
@item Download enclosures

Many feeds include links to so-called enclosures, like audio files for
podcasts. While you mail is not processed by MUA, its @file{new/}
messages still there, you can run enclosure downloading process, that
uses @url{https://www.gnu.org/software/wget/, GNU Wget}. Specify the
directory where your enclosures should be placed. Each enclosure's
filename is more or less filesystem-friendly with the current timestamp
in it.

@example
$ mkdir path/to/enclosures
$ ./feeds-encs.zsh path/to/enclosures
[...]
traffic.libsyn.com_monsterfeet_grue_018.mp3-20220218-152822
[...]
$ file path/to/enclosures/traffic.libsyn.com_monsterfeet_grue_018.mp3-20220218-152822
path/to/...: Audio file with ID3 version 2.2.0, contains:MPEG ADTS, layer III, v1,  96 kbps, 44.1 kHz, Monaural
@end example

@command{feeds-encs.zsh} do not parallelize jobs, because enclosure are
often heavy enough to satiate your Internet link.

@end table