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This can be useful to make more cleanly make connector scripts.
This does not necesarily even have to be in the sfeed(5) format.
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... and do not show stderr of readlink.
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surrogate pair
Regression in commit 12b279581fbbcde2b36eb4b78d70a1c52d4a209a
0xdffff should be 0xdfff.
printf '<item><title>👈</title></item>' | sfeed
Before (bad):
👈
After:
👈
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This regression introduced in commit e43b7a48 on Tue Oct 6 18:51:33 2020 +0200.
After a content tag was parsed the "iscontenttag" variable was not reset.
This caused 2 regressions:
- It ignored other tags such as links after it.
- It incorrectly set the content-type of a lesser priority field.
Thanks to pazz0 for reporting it!
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Interesting C compiler project:
lacc: A simple, self-hosting C compiler:
https://github.com/larmel/lacc
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Simple way to reproduce:
printf '<item><title>�</title></item>' | sfeed | iconv -t utf-8
Result:
iconv: (stdin):1:8: cannot convert
Output result:
printf '<item><title>�</title></item>' | sfeed
Before:
00000000 09 ed b0 80 09 09 09 09 09 09 09 0a |............|
0000000c
After:
00000000 09 26 23 78 64 63 30 30 3b 09 09 09 09 09 09 09 |.�.......|
00000010 0a |.|
00000011
The entity is output as a literal string. This allows to see more easily whats
wrong and debug the feed and it is consistent with the current behaviour of
invalid named entities (&bla;). An alternative could be a UTF-8 replacement
symbol (codepoint 0xfffd).
Reference: https://unicode.org/faq/utf_bom.html , specificly:
"Q: How do I convert an unpaired UTF-16 surrogate to UTF-8? "
"A: A different issue arises if an unpaired surrogate is encountered when
converting ill-formed UTF-16 data. By representing such an unpaired surrogate
on its own as a 3-byte sequence, the resulting UTF-8 data stream would become
ill-formed. While it faithfully reflects the nature of the input, Unicode
conformance requires that encoding form conversion always results in a valid
data stream. Therefore a converter must treat this as an error. [AF]"
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- Improve feed creation with empty results and new feed files.
Always make sure the file is created even when it is new and there are also no
items (after filtering).
- Consistency: always use the same feed file for merging.
Do not use "/dev/null" when it is a new file. This works using sort, but is
ugly when the merge() function is overridden and does something else. It should
be the feed file always.
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This adds the name as the first parameter for the convertencoding() function,
like filter, merge, order, etc.
This can be useful to make an exception rule for text decoding in a more clean
way.
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OPML is a more generic format, this tool is specificly for "rss" types and
subscription lists.
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- Export read/unread state to a separate plain-text "urls" file, line by line.
- Handle white-space control-chars better.
From the sfeed(1) man page:
" The fields: title, id, author are not allowed to have newlines and TABs,
all whitespace characters are replaced by a single space character.
Control characters are removed."
So do the reverse for newsboat aswell: change white-space characters which are
also control-characters (such as TABs and newlines) to a single space
character.
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Make a huge difference (cuts the time in half to process the same amount of
lines) on atleast glibc 2.30 on Void Linux. Seems to make no difference on
OpenBSD.
- This removes atleast one heap allocation per line (checked with valgrind).
This is because glibc will strdup() the environment variable $TZ and free it
each time, which is pointless here and wasteful.
- localtime_r does not require to set the variables like tzname.
In glibc-2.30/time/tzset.c in __tz_convert is the following code and comment:
/* Update internal database according to current TZ setting.
POSIX.1 8.3.7.2 says that localtime_r is not required to set tzname.
This is a good idea since this allows at least a bit more parallelism. */
tzset_internal (tp == &_tmbuf && use_localtime);
This makes it always tzset() and inspect the environment $TZ etc. While with
localtime_r it will only initialize it once:
static void tzset_internal (int always) {
[...]
if (is_initialized && !always)
return;
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range >= 127
For example: "\xef\xbf\xb7" (codepoint 0xfff7), returns wcwidth(wc) == -1.
The next byte was incorrected seeked, but the codepoint itself was valid
(mbtowc).
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characters
This affects sfeed_plain.
- Use unicode replacement character (codepoint 0xfffd) when a codepoint is
invalid and proceed printing the rest of the characters.
- When a codepoint is invalid reset the internal state of mbtowc(3), from the
OpenBSD man page:
" If a call to mbtowc() resulted in an undefined internal state, mbtowc()
must be called with s set to NULL to reset the internal state before it
can safely be used again."
- Optimize for the common ASCII case and use a macro to print the character
instead of a wasteful fwrite() function call. With 250k lines (+- 350MB) this
improves printing performance from 1.7s to 1.0s on my laptop. On an other
system it improved by +- 25%. Tested with clang and gcc and also tested the
worst-case (non-ASCII) with no penalty.
To test:
printf '0\tabc\xc3 def' | sfeed_plain
Before:
1970-01-01 01:00 abc
After:
1970-01-01 01:00 abc� def
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Same reason as the previous commit (allow to expand to macros).
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Use putc instead of fputc, it can be optimized to macros.
From the OpenBSD man page:
" putc() acts essentially identically to fputc(), but is a macro that
expands in-line. It may evaluate stream more than once, so arguments
given to putc() should not be expressions with potential side effects."
sfeed_atom, sfeed_frames and sfeed_html are using this function.
Mini-benchmarked sfeed_html and it went from 1.45s to 1.0s with feed files in
total 250k lines (+- 350MB). Tested with clang and gcc on OpenBSD on an older
laptop.
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sfeed_gopher must be able to write in the current directory, but does not need
write permissions outside it. It could read from any place in the filesystem
(to read feed files).
Prompted by a suggestion from vejetaryenvampir, thanks!
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... move sections around in a more logical order and tweak some words.
Prompted by a question and feedback from Aleksei, thanks!
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Feeds should contain absolute urls, but if it does not have it then this makes
it more convenient to configure such feeds.
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sfeed_xmlenc is used automatically in sfeed_update for detecting the encoding.
In particular do not allow slashes anymore either. For example "//IGNORE" and
"//TRANSLIT" which are normally allowed.
Some iconv implementation might allow other funky names or even pathnames too,
so disallow that.
See also the notes about the "frommap" for the "-f" option.
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/iconv.html
+ some minor parsing handling improvements.
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This happens because the previous link type is not reset when a <link> tag
starts again, but it is reset when a type attribute starts.
Found on the spanish newspaper site: elpais.com
Input:
<link rel="alternate" href="https://feeds.elpais.com/mrss-s/pages/ep/site/elpais.com/portada" type="application/rss+xml" title="RSS de la portada de El País"/>
<link rel="canonical" href="https://elpais.com"/>
Would print (second line is incorrect).
https://feeds.elpais.com/mrss-s/pages/ep/site/elpais.com/portada application/rss+xml
https://elpais.com/ application/rss+xml
Now prints:
https://feeds.elpais.com/mrss-s/pages/ep/site/elpais.com/portada application/rss+xml
Fix: reset it also at the start of a <link> tag in this case (for <base href />
it is still not wanted).
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(ascii.jp)
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Fix attribute parsing and now decode entities. The following now works (from
helsinkitimes.fi):
<base href="https://www.helsinkitimes.fi/" />
<link href="/?format=feed&type=rss" rel="alternate" type="application/rss+xml" title="RSS 2.0" />
<link href="/?format=feed&type=atom" rel="alternate" type="application/atom+xml" title="Atom 1.0" />
Properly associate attributes with the actual tag, this now parses properly
(from ascii.jp).
<link rel="apple-touch-icon-precomposed" href="/img/apple-touch-icon.png" />
<link rel="alternate" type="application/rss+xml" />
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Fixes a regression introduced in the refactor in commit
e43b7a48b08a6bbcb4e730e80395b3257681b33e
Now copy the data by value. This structure is small and no performance
regression has been seen.
This was because the tag ID was modified which made subsequent parsed tags of
this type behave strangely:
ctx.tag->id = RSSTagGuidPermalinkTrue;
Input data to reproduce:
<rss>
<channel>
<item>
<guid isPermaLink="false">https://def/</guid>
</item>
<item>
<guid>https://abc/</guid>
</item>
</channel>
</rss>
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https://support.google.com/analytics/answer/1033867?hl=nl
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Noticed strange output on the site ascii.jp:
The site HTML contained:
<link rel="apple-touch-icon-precomposed" href="/img/apple-touch-icon.png" />
<link rel="alternate" type="application/rss+xml" />
This would print:
"/img/apple-touch-icon.png application/rss+xml"
Now it prints:
" application/rss+xml"
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Use the same base filename as the feed file, because sfeed_update replaces '/'
in names with '_':
filename="$(printf '%s' "$1" | tr '/' '_')"
This fixes the example for fetching feeds with names containing '/'.
Reported by __20h__, thanks!
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Forgot it in the cleanup commit 37afcf334fa1ba0b668bde08e8fcaaa9fd7dfa0d
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Found by testing using mawk.
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This reverts commit a1516cb7869a0dd99ebaacf846ad4161f2b9b9a2.
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This way dc:date could be the updated time of the item. For Atom there is
<published> and <updated> with the same logic.
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Fields with multiple values are separated by '|'. In the future multiple
enclosure support might be added.
The categories tags are now parsed. This feature is useful for filtering and
categorizing.
Parsing of nested tags such as <author><name> has been improved. This code has
been refactored.
RSS <guid> isPermaLink is now handled differently also and will now prefer a
permalink with "true" (link) over the ID. In practise multiple <guid> in an
item does not happen.
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