README: update dependency information for xargs for sfeed_update

Remove the parallel xargs example because it is now the default.

1 files changed, 2 insertions, 56 deletions

diff --git a/README b/README
index 8ea13ed..47d4d76 100644
--- a/README
+++ b/README
@@ -117,6 +117,8 @@ Optional dependencies
   used by sfeed_update(1). If the text in your RSS/Atom feeds are already UTF-8
   encoded then you don't need this. For a minimal iconv implementation:
   https://git.etalabs.net/cgit/noxcuse/tree/src/iconv.c
+- xargs with support for the -P and -0 option,
+  used by sfeed_update(1).
 - mandoc for documentation: https://mdocml.bsd.lv/
 - curses (typically ncurses), otherwise see minicurses.h,
   used by sfeed_curses(1).
@@ -706,62 +708,6 @@ sfeedrc file and change the curl options "-L --max-redirs 0".
 
 - - -
 
-Shellscript to update feeds in parallel more efficiently using xargs -P.
-
-It creates a queue of the feeds with its settings, then uses xargs to process
-them in parallel using the common, but non-POSIX -P option. This is more
-efficient than the more portable solution in sfeed_update which can stall a
-batch of $maxjobs in the queue if one item is slow.
-
-sfeed_update_xargs shellscript:
-
-	#!/bin/sh
-	# update feeds, merge with old feeds using xargs in parallel mode (non-POSIX).
-	
-	# include script and reuse its functions, but do not start main().
-	SFEED_UPDATE_INCLUDE="1" . sfeed_update
-	# load config file, sets $config.
-	loadconfig "$1"
-	
-	# process a single feed.
-	# args are: config, tmpdir, name, feedurl, basesiteurl, encoding
-	if [ "${SFEED_UPDATE_CHILD}" = "1" ]; then
-		sfeedtmpdir="$2"
-		_feed "$3" "$4" "$5" "$6"
-		exit $?
-	fi
-	
-	# ...else parent mode:
-	
-	# feed(name, feedurl, basesiteurl, encoding)
-	feed() {
-		# workaround: *BSD xargs doesn't handle empty fields in the middle.
-		name="${1:-$$}"
-		feedurl="${2:-http://}"
-		basesiteurl="${3:-${feedurl}}"
-		encoding="$4"
-	
-		printf '%s\0%s\0%s\0%s\0%s\0%s\0' "${config}" "${sfeedtmpdir}" \
-			"${name}" "${feedurl}" "${basesiteurl}" "${encoding}"
-	}
-	
-	# fetch feeds and store in temporary directory.
-	sfeedtmpdir="$(mktemp -d '/tmp/sfeed_XXXXXX')" || exit 1
-	mkdir -p "${sfeedtmpdir}/feeds"
-	touch "${sfeedtmpdir}/ok" || exit 1
-	# make sure path exists.
-	mkdir -p "${sfeedpath}"
-	# print feeds for parallel processing with xargs.
-	feeds | SFEED_UPDATE_CHILD="1" xargs -r -0 -P "${maxjobs}" -L 6 "$(readlink -f "$0")"
-	statuscode=$?
-	# check error exit status indicator for parallel jobs.
-	test -f "${sfeedtmpdir}/ok" || statuscode=1
-	# cleanup temporary files etc.
-	cleanup
-	exit ${statuscode}
-
-- - -
-
 Shellscript to handle URLs and enclosures in parallel using xargs -P.
 
 This can be used to download and process URLs for downloading podcasts,