.Dd July 14, 2019
.Dt SFEEDRC 5
.Os
.Sh NAME
.Nm sfeedrc
.Nd sfeed_update(1) configuration file
.Sh DESCRIPTION
.Nm
is the configuration file for
.Xr sfeed_update 1 .
.Pp
The variable
.Va sfeedpath
can be set for the directory to store the TAB-separated feed files,
by default this is
.Pa $HOME/.sfeed/feeds .
.
.Sh FUNCTIONS
The following functions must be defined in a
.Nm
file:
.Bl -tag -width Ds
.It Fn feeds
This function is like a "main" function called from
.Xr sfeed_update 1 .
.It Fn feed "name" "feedurl" "basesiteurl" "encoding"
Function to process the feed, its arguments are in the order:
.Bl -tag -width Ds
.It Fa name
Name of the feed, this is also used as the filename for the TAB-separated
feed file.
The filename cannot contain '/' characters, they will be replaced with '_'.
.It Fa feedurl
Uri to fetch the RSS/Atom data from, usually a HTTP or HTTPS uri.
.It Op Fa basesiteurl
Baseurl of the feed links.
This argument allows to fix relative item links.
.Pp
According to the RSS and Atom specification feeds should always have absolute
urls, however this is not always the case in practise.
.It Op Fa encoding
Feeds are decoded from this name to UTF-8, the name should be a usable
character-set for the
.Xr iconv 1
tool.
.El
.El
.Sh OVERRIDE FUNCTIONS
Because
.Xr sfeed_update 1
is a shellscript each function can be overridden to change its behaviour,
notable functions are:
.Bl -tag -width Ds
.It Fn fetch "name" "uri" "feedfile"
Fetch feed from url and writes data to stdout, its arguments are:
.Bl -tag -width Ds
.It Fa name
Specified name in configuration file (useful for logging).
.It Fa uri
Uri to fetch.
.It Fa feedfile
Used feedfile (useful for comparing modification times).
.El
.It Fn merge "name" "oldfile" "newfile"
Merge data of oldfile with newfile and writes it to stdout, its arguments are:
.Bl -tag -width Ds
.It Fa name
Feed name.
.It Fa oldfile
Old file.
.It Fa newfile
New file.
.El
.It Fn filter "name"
Filter
.Xr sfeed 5
data from stdin, write to stdout, its arguments are:
.Bl -tag -width Ds
.It Fa name
Feed name.
.El
.It Fn order "name"
Sort
.Xr sfeed 5
data from stdin, write to stdout, its arguments are:
.Bl -tag -width Ds
.It Fa name
Feed name.
.El
.It Fn convertencoding "from" "to"
Convert from text-encoding to another and writes it to stdout, its arguments
are:
.Bl -tag -width Ds
.It Fa from
From text-encoding.
.It Fa to
To text-encoding.
.El
.El
.Sh EXAMPLES
An example configuration file is included named sfeedrc.example and also
shown below:
.Bd -literal
#sfeedpath="$HOME/.sfeed/feeds"

# list of feeds to fetch:
feeds() {
	# feed <name> <feedurl> [basesiteurl] [encoding]
	feed "codemadness" "https://www.codemadness.nl/atom.xml"
	feed "explosm" "http://feeds.feedburner.com/Explosm"
	feed "golang github releases" "https://github.com/golang/go/releases.atom"
	feed "linux kernel" "https://www.kernel.org/feeds/kdist.xml" "https://www.kernel.org"
	feed "reddit openbsd" "https://old.reddit.com/r/openbsd/.rss"
	feed "slashdot" "http://rss.slashdot.org/Slashdot/slashdot" "http://slashdot.org"
	feed "tweakers" "http://feeds.feedburner.com/tweakers/mixed" "http://tweakers.net" "iso-8859-1"
	# get youtube Atom feed: curl -s -L 'https://www.youtube.com/user/gocoding/videos' | sfeed_web | cut -f 1
	feed "youtube golang" "https://www.youtube.com/feeds/videos.xml?channel_id=UCO3LEtymiLrgvpb59cNsb8A"
	feed "xkcd" "https://xkcd.com/atom.xml" "https://xkcd.com"
}
.Ed
.Sh SEE ALSO
.Xr sfeed_update 1 ,
.Xr sh 1
.Sh AUTHORS
.An Hiltjo Posthuma Aq Mt hiltjo@codemadness.org