commit 6603a965948b1426a254603da8b28b841836a37b
parent 33f0e062a28bcd204a35ff0a1388e16e871c65cd
Author: Hiltjo Posthuma <hiltjo@codemadness.org>
Date:   Thu,  6 Feb 2020 21:28:55 +0100

README: simplify sfeed_archive example using awk

Also use a more portable date +'%s' (remove -j).
NOTE though: date +'%s' is not POSIX, but it is supported in most cases.

Diffstat:
MREADME | 90++++++++++++++-----------------------------------------------------------------
1 file changed, 16 insertions(+), 74 deletions(-)

diff --git a/README b/README @@ -326,15 +326,11 @@ to an Atom XML feed (again): #!/bin/sh cd ~/.sfeed/feeds/ || exit 1 - awk -F '\t' -v "old=$(($(date -j +'%s') - 86400))" ' - BEGIN { - OFS = "\t"; - } - { - if (int($1) >= old) { - $2 = "[" FILENAME "] " $2; - print $0; - } + awk -F '\t' -v "old=$(($(date +'%s') - 86400))" ' + BEGIN { OFS = "\t"; } + int($1) >= old { + $2 = "[" FILENAME "] " $2; + print $0; }' * | \ sort -k1,1rn | \ sfeed_atom @@ -362,13 +358,11 @@ On the writing side: test -p "$fifo" || exit 1 # 1 day is old news, don't write older items. - awk -v "old=$(($(date -j +'%s') - 86400))" ' - BEGIN { FS = OFS = "\t"; } - { - if (int($1) >= old) { - $2 = "[" FILENAME "] " $2; - print $0; - } + awk -F '\t' -v "old=$(($(date +'%s') - 86400))" ' + BEGIN { OFS = "\t"; } + int($1) >= old { + $2 = "[" FILENAME "] " $2; + print $0; }' * | sort -k1,1n | sfeed_plain | cut -b 3- > "$fifo" cut -b is used to trim the "N " prefix of sfeed_plain(1). @@ -378,7 +372,7 @@ cut -b is used to trim the "N " prefix of sfeed_plain(1). For some podcast feed the following code can be used to filter the latest enclosure url (probably some audio file): - awk -F "\t" 'BEGIN { latest = 0; } + awk -F '\t' 'BEGIN { latest = 0; } length($8) { ts = int($1); if (ts > latest) { @@ -390,64 +384,12 @@ enclosure url (probably some audio file): - - - -Over time your feeds file might become quite big. You can archive items from a -specific date by doing for example: - -File sfeed_archive.c: - - #include <sys/types.h> - - #include <err.h> - #include <stdio.h> - #include <stdlib.h> - #include <string.h> - #include <time.h> - - #include "util.h" - - int - main(int argc, char *argv[]) - { - char *line = NULL, *p; - time_t parsedtime, comparetime; - struct tm tm; - size_t size = 0; - int r, c, y, m, d; - - if (argc != 2 || strlen(argv[1]) != 8 || - sscanf(argv[1], "%4d%2d%2d", &y, &m, &d) != 3) { - fputs("usage: sfeed_archive yyyymmdd\n", stderr); - exit(1); - } - - memset(&tm, 0, sizeof(tm)); - tm.tm_isdst = -1; /* don't use DST */ - tm.tm_year = y - 1900; - tm.tm_mon = m - 1; - tm.tm_mday = d; - if ((comparetime = mktime(&tm)) == -1) - err(1, "mktime"); - - while ((getline(&line, &size, stdin)) > 0) { - if (!(p = strchr(line, '\t'))) - continue; - c = *p; - *p = '\0'; /* temporary null-terminate */ - if ((r = strtotime(line, &parsedtime)) != -1 && - parsedtime >= comparetime) { - *p = c; /* restore */ - fputs(line, stdout); - } - } - return 0; - } - -Now compile and run: +Over time your feeds file might become quite big. You can archive items of a +feed from (roughly) the last week by doing for example: - $ cc -std=c99 -o sfeed_archive util.c sfeed_archive.c - $ ./sfeed_archive 20150101 < feeds > feeds.new - $ mv feeds feeds.bak - $ mv feeds.new feeds + awk -F '\t' -v "old=$(($(date +'%s') - 604800))" 'int($1) > old' < feed > feed.new + mv feed feed.bak + mv feed.new feed This could also be run weekly in a crontab to archive the feeds. Like throwing away old newspapers. It keeps the feeds list tidy and the formatted output