render

output/about-blog.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="./tag/lifehack.html">lifehack</a></li>
+	<li><a href="./tag/print.html">print</a></li>
 	<li><a href="./tag/comics.html">comics</a></li>
 	<li><a href="./tag/software.html">software</a></li>
 	<li><a href="./tag/ipv6-only.html">ipv6-only</a></li>

output/archives.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="./tag/lifehack.html">lifehack</a></li>
+	<li><a href="./tag/print.html">print</a></li>
 	<li><a href="./tag/comics.html">comics</a></li>
 	<li><a href="./tag/software.html">software</a></li>
 	<li><a href="./tag/ipv6-only.html">ipv6-only</a></li>
@@ -57,7 +59,8 @@
 <main>
 	<div>
 <h1>Archive</h1>
-<ul> <li><a href="./cbz-to-pdf.html">How to convert CBZ to PDF</a>
+<ul> <li><a href="./mobius-print.html">Print your stuff on Möbius bands!</a>
+<li><a href="./cbz-to-pdf.html">How to convert CBZ to PDF</a>
 <li><a href="./forgetting-dns6.html">Do not forget about IPv6 DNS</a>
 <li><a href="./about-blog.html">About this blog</a>
 <li><a href="./smrst2023-cs.html">Smršť 2023 (CZ)</a>

output/categories.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="./tag/lifehack.html">lifehack</a></li>
+	<li><a href="./tag/print.html">print</a></li>
 	<li><a href="./tag/comics.html">comics</a></li>
 	<li><a href="./tag/software.html">software</a></li>
 	<li><a href="./tag/ipv6-only.html">ipv6-only</a></li>

output/category/networking.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/category/talks.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/category/technology.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>
@@ -57,7 +59,8 @@
 <main>
 	<div>
 <h1>Category: technology</h1>
-<ul> <li><a href="../about-blog.html">About this blog</a>
+<ul> <li><a href="../mobius-print.html">Print your stuff on Möbius bands!</a>
+<li><a href="../about-blog.html">About this blog</a>
 </ul>
 	</div>
 </main>

output/category/til.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/cbz-to-pdf.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="./tag/lifehack.html">lifehack</a></li>
+	<li><a href="./tag/print.html">print</a></li>
 	<li><a href="./tag/comics.html">comics</a></li>
 	<li><a href="./tag/software.html">software</a></li>
 	<li><a href="./tag/ipv6-only.html">ipv6-only</a></li>

output/drafts.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="./tag/lifehack.html">lifehack</a></li>
+	<li><a href="./tag/print.html">print</a></li>
 	<li><a href="./tag/comics.html">comics</a></li>
 	<li><a href="./tag/software.html">software</a></li>
 	<li><a href="./tag/ipv6-only.html">ipv6-only</a></li>

output/drafts/ucw-keymap-on-wayland.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>
@@ -277,6 +279,50 @@ we could possibly have, so now we get our hands dirty. A simple <tt class="docut
 wl_keyboard src/</tt> tells us that the keyboard handling occurs in the file
 <tt class="docutils literal"><span class="pre">hw/xwayland/xwayland-input.c</span></tt> in functions <tt class="docutils literal">keyboard_handle_*</tt>, which look
 like the libwayland-client handlers we have seen in <tt class="docutils literal">wev</tt>.</p>
+<p>However, the fun ends here. I found the generic code of Xorg (which these
+handlers quickly call) rather hard to make sense of <a class="footnote-reference" href="#me-lost" id="footnote-reference-2">[2]</a> (though ctags,
+<tt class="docutils literal">printf(3)</tt>, debug build and gdb might help) and the implementation of XKB is
+rather massive: about 20 000 loc just in the <tt class="docutils literal">xkb/</tt> directory. And touching
+this code in a bad way might break something somewhere for somebody.</p>
+<p>We can get creative though. We know that this issue is only present in
+XWayland, which (by a quick <tt class="docutils literal">grep <span class="pre">-l</span></tt>) seems to live in <tt class="docutils literal">hw/xwayland</tt>. Yay,
+only about 12 000 loc to sift through :-) This code is safe(r) to destroy,
+though, since other stuff will supposedly not be influenced.</p>
+<p>This is about a month since I begun exploring the issue (I attend to this
+mostly on my commute or during free time in some evenings, so it goes slowly).
+Because of that, I became too fixated on a task of &quot;getting <tt class="docutils literal">xev</tt> not to show
+group 2 instead of group 1&quot; (in the state bits). What I needed to remember was
+that my task could also be &quot;getting XWayland's implementation of XKB group not
+interfere with the compositor's one&quot;.</p>
+<p>Can I have some fun, please? Imagine a <a class="reference external" href="TODO">James Veitch's style of lines appearing here</a>…</p>
+<pre class="literal-block">
+static void
+keyboard_handle_modifiers(void *data, struct wl_keyboard *keyboard,
+                          uint32_t serial, uint32_t mods_depressed,
+                          uint32_t mods_latched, uint32_t mods_locked,
+                          uint32_t group)
+{
+    /*lol*/group = 0;
+    // the rest of function…
+</pre>
+<p>Okay, <tt class="docutils literal">xev</tt> tells me this is actually the way. Can I have more fun?</p>
+<pre class="literal-block">
+/*rofl*/return;
+</pre>
+<!-- Could we make the line above correctly indented? -->
+<p>Oh yes I can! Even with this piece of heresy <tt class="docutils literal">xev</tt> resolves state correctly,
+even with combination with other modifiers like control and shift, three
+groups, …</p>
+<p>This seems to be a sensible way, because the Wayland protocol seems to promise
+to send wl_keyboard::key before wl_keyboard::modifiers:</p>
+<blockquote>
+If this event [wl_keyboard::key] produces a change in modifiers, then the
+resulting wl_keyboard.modifiers event must be sent after this event.</blockquote>
+<p>My hypothesis is that XWayland's XKB updates its state when receiving the ::key
+events and the following ::modifiers event confuses it. However, I do not yet
+know what that code is supposed to do.</p>
+<!-- TODO: test group changing/locking, not momentary. -->
+<!-- TODO: understand the reasoning behind the "dead" code -->
 <!-- TO-MENTION:
 - nested compositor issues
 - the IM resolves compose? (I could bisect it, but too lazy)
@@ -293,6 +339,20 @@ sopass and write the dissectors and dumping from sopass to a pcap file in a
 future. However, this gets put on hold now.</td></tr>
 </tbody>
 </table>
+<!-- Before my browser crashes: https://rawgit.com/CoreSecurity/pcapy/master/pcapy.html https://libpcap.readthedocs.io/en/latest/
+also, wireshark can import hexdumps -->
+<table class="docutils footnote" frame="void" id="me-lost" rules="none">
+<colgroup><col class="label" /><col /></colgroup>
+<tbody valign="top">
+<tr><td class="label"><a class="fn-backref" href="#footnote-reference-2">[2]</a></td><td>I tried to track how a wl_keyboard::key gets processed to a
+KeyPress, but I ended up at it being processed in <tt class="docutils literal">mieq</tt>, where it gets
+enqueued without group/state info and then it gets too generic. I have no
+idea how XKB is tied into that, but I chickened out relatively quickly when
+I realized that I should not really be touching the general code. I didn't
+get to use gdb in the end, though I was very close to wanting to see
+backtraces – I backed out just before trying this approach.</td></tr>
+</tbody>
+</table>
 </div>
 
 	</div>

output/feeds/all.atom.xml

@@ -1,5 +1,189 @@
 <?xml version="1.0" encoding="utf-8"?>
-<feed xmlns="http://www.w3.org/2005/Atom"><title>LEdoian's Blog</title><link href="https://blog.ledoian.cz/" rel="alternate"></link><link href="https://blog.ledoian.cz/feeds/all.atom.xml" rel="self"></link><id>https://blog.ledoian.cz/</id><updated>2024-02-17T16:55:00+01:00</updated><entry><title>How to convert CBZ to PDF</title><link href="https://blog.ledoian.cz/cbz-to-pdf.html" rel="alternate"></link><published>2024-02-17T16:55:00+01:00</published><updated>2024-02-17T16:55:00+01:00</updated><author><name>LEdoian</name></author><id>tag:blog.ledoian.cz,2024-02-17:/cbz-to-pdf.html</id><summary type="html">&lt;ol class="arabic simple"&gt;
+<feed xmlns="http://www.w3.org/2005/Atom"><title>LEdoian's Blog</title><link href="https://blog.ledoian.cz/" rel="alternate"></link><link href="https://blog.ledoian.cz/feeds/all.atom.xml" rel="self"></link><id>https://blog.ledoian.cz/</id><updated>2024-03-02T18:07:00+01:00</updated><entry><title>Print your stuff on Möbius bands!</title><link href="https://blog.ledoian.cz/mobius-print.html" rel="alternate"></link><published>2024-03-02T18:07:00+01:00</published><updated>2024-03-02T18:07:00+01:00</updated><author><name>LEdoian</name></author><id>tag:blog.ledoian.cz,2024-03-02:/mobius-print.html</id><summary type="html">&lt;p&gt;I found a fun and useful way of printing stuff to ~~both~~all sides of a paper.
+I just need to find the right printer!&lt;/p&gt;
+&lt;div class="section" id="quick-recap-how-to-conventionally-print-stuff-two-sided"&gt;
+&lt;h2&gt;Quick recap: how to conventionally print stuff two-sided&lt;/h2&gt;
+&lt;p&gt;A typical way is just sending the page to get printed two-sided (with setting
+the correct way …&lt;/p&gt;&lt;/div&gt;</summary><content type="html">&lt;p&gt;I found a fun and useful way of printing stuff to ~~both~~all sides of a paper.
+I just need to find the right printer!&lt;/p&gt;
+&lt;div class="section" id="quick-recap-how-to-conventionally-print-stuff-two-sided"&gt;
+&lt;h2&gt;Quick recap: how to conventionally print stuff two-sided&lt;/h2&gt;
+&lt;p&gt;A typical way is just sending the page to get printed two-sided (with setting
+the correct way of flipping pages). That is, on the other side of page 1 is
+page 2, next sheet contains pages 3,4, then 5 &amp;amp; 6, …&lt;/p&gt;
+&lt;p&gt;This is usually trivial to print on duplex printers, a bit hard to simulate on
+one-sided printers (but some drivers can do that) and has drawbacks when you
+need to look at stuff on other pages at the same time – you need to flip the
+sheet often, as you only can put half of the pairs of pages next to each other
+(even one and the following odd one).&lt;/p&gt;
+&lt;div class="figure"&gt;
+&lt;object data="https://blog.ledoian.cz/images/mobius-print/twoside.svg" style="width: 66%;" type="image/svg+xml"&gt;&lt;/object&gt;
+&lt;p class="caption"&gt;Ordinary two-sided printing. Red arrows show sheet flips between consecutive
+pages.&lt;/p&gt;
+&lt;/div&gt;
+&lt;p&gt;A slight improvement hack is putting two pages on the same side of the paper
+(works well with A-series of papers, I don't know for Letters &amp;amp;co.) – you can
+put up to four pages of the original document next to each other, if they are
+the right ones, but there are still pairs of pages that need turning sheets.
+Also only works if the original pages do not have too tiny features on them.
+&lt;a class="footnote-reference" href="#illustrations" id="footnote-reference-1"&gt;[1]&lt;/a&gt;&lt;/p&gt;
+&lt;p&gt;Booklets are fun and approachable, but still suffer from the same issues as the
+conventional duplex print. They might be a bit hard to print, but programs like
+&lt;tt class="docutils literal"&gt;pdfbook&lt;/tt&gt; or &lt;tt class="docutils literal"&gt;paperjam&lt;/tt&gt; make it easy to prepare for the classic duplex
+printing. Also, it is maybe hard to tell which page ends up where, as the order
+is: last+first, second+penultimate, third-from-end+third, … until the pages
+meet in the middle.&lt;/p&gt;
+&lt;div class="figure"&gt;
+&lt;object data="https://blog.ledoian.cz/images/mobius-print/booklet.svg" style="width: 66%;" type="image/svg+xml"&gt;&lt;/object&gt;
+&lt;p class="caption"&gt;The most common booklet order with two pages per side for landscape
+orientation. (Note that we show more pages, and thus more sheet-flips; the
+number of sheet-flips is in fact the same as for two-sided printing.)&lt;/p&gt;
+&lt;/div&gt;
+&lt;/div&gt;
+&lt;div class="section" id="the-improvement-for-seeing-multiple-consecutive-pages"&gt;
+&lt;h2&gt;The improvement for seeing multiple consecutive pages&lt;/h2&gt;
+&lt;p&gt;In order to be able to look simultaneously at many consecutive pages of the
+original, I think the order of first+first-past-half, second+second-past-half,
+… middle+last is much better (or maybe even the best).  Since consecutive pages
+end up on different sheets (whenever there are at least three pages), if the
+original has e.g. figures on different page or long code listing, you can see
+it all!&lt;/p&gt;
+&lt;div class="figure"&gt;
+&lt;object data="https://blog.ledoian.cz/images/mobius-print/mobius.svg" style="width: 66%;" type="image/svg+xml"&gt;&lt;/object&gt;
+&lt;p class="caption"&gt;The &amp;quot;Möbius order&amp;quot; of pages.&lt;/p&gt;
+&lt;/div&gt;
+&lt;p&gt;And this is really easy to use: You read a page and when you don't need it
+anymore, you flip it and put to the end of the page stack &lt;a class="footnote-reference" href="#ordering" id="footnote-reference-2"&gt;[2]&lt;/a&gt;. If you
+need to look at several pages, just rotate them in the same order as they go the
+first time. &lt;a class="footnote-reference" href="#mistake" id="footnote-reference-3"&gt;[3]&lt;/a&gt;&lt;/p&gt;
+&lt;p&gt;Need to print this? For one-sided printers this is rather easy, too: just print
+the first half (the bigger one) on the sheets, then put them back into the tray
+and print the rest on them. You might need to experiment which side the sheets
+should be put in and whether you need to print the rest in reverse order, but
+that is it.&lt;/p&gt;
+&lt;p&gt;Got the pages shuffled? Sort them by the first half, as if the print was
+one-sided.&lt;/p&gt;
+&lt;p&gt;The only annoying thing for me is that there is not much software that could
+reorder the pages for two-sided printing, so that you don't need to re-insert
+the sheets back in the tray. So I &lt;a class="reference external" href="https://blog.ledoian.cz/images/mobius-print/interleave.patch"&gt;patched&lt;/a&gt; &lt;a class="reference external" href="https://mj.ucw.cz/sw/paperjam/"&gt;paperjam&lt;/a&gt; to enable this. &lt;a class="footnote-reference" href="#multi-mobius" id="footnote-reference-4"&gt;[4]&lt;/a&gt;&lt;/p&gt;
+&lt;p&gt;And the best part? If you would try to glue consecutive pages side-to-side,
+you'd end up with a Möbius band! So if you get a Möbius paper, you can just
+print this one-sided (duh :-D)&lt;/p&gt;
+&lt;/div&gt;
+&lt;div class="section" id="honorable-mention-leporello"&gt;
+&lt;h2&gt;Honorable mention: leporello&lt;/h2&gt;
+&lt;p&gt;Printing leporellos (aka concertina folded) also has many of the same benefits,
+since there is only one pair of consecutive pages that need a page flip. The
+order is first+last, second+penultimate, … and the original pages can be
+shuffled this way with &lt;tt class="docutils literal"&gt;paperjam&lt;/tt&gt; or simply using the other order for the
+second side printing, than for the Möbius band. But there is a bit of fun
+topology missing here :-)&lt;/p&gt;
+&lt;div class="figure"&gt;
+&lt;object data="https://blog.ledoian.cz/images/mobius-print/leporello.svg" style="width: 66%;" type="image/svg+xml"&gt;&lt;/object&gt;
+&lt;p class="caption"&gt;A leporello order is also quite good, with only one sheet-flip in the entire
+document.&lt;/p&gt;
+&lt;/div&gt;
+&lt;/div&gt;
+&lt;div class="section" id="is-this-the-best-order"&gt;
+&lt;h2&gt;Is this the best order?&lt;/h2&gt;
+&lt;p&gt;Yes, if &amp;quot;best&amp;quot; means &amp;quot;the minimum difference of numbers of pages that get put
+on the same sheet is as big as possible&amp;quot;. The proof is left as an exercise for
+the reader.&lt;/p&gt;
+&lt;!-- Hint: you cannot pair the middle page to anything else to get a better
+result. --&gt;
+&lt;p&gt;Of course, this holds for a set of pages with no additional assumptions. In
+ordinary print, having a sheet-turn between chapters is fine and under similar
+guarantees other approaches may yield better results.&lt;/p&gt;
+&lt;/div&gt;
+&lt;div class="section" id="cheat-sheet-paperjam-commands"&gt;
+&lt;h2&gt;Cheat sheet: paperjam commands&lt;/h2&gt;
+&lt;table border="1" class="docutils"&gt;
+&lt;caption&gt;Various commands for ordering pages for duplex printing with paperjam.&lt;/caption&gt;
+&lt;thead valign="bottom"&gt;
+&lt;tr&gt;&lt;th class="head"&gt;Order&lt;/th&gt;
+&lt;th class="head"&gt;Command&lt;/th&gt;
+&lt;/tr&gt;
+&lt;/thead&gt;
+&lt;tbody valign="top"&gt;
+&lt;tr&gt;&lt;td&gt;Classic two-sided&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;null&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Two pages per side&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;nup(2)&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Booklet&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;book&lt;/tt&gt; (follow with &lt;tt class="docutils literal"&gt;nup(2)&lt;/tt&gt; for actual booklet print)&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Leporello&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(2) {1 2} modulo(1,half) {1 &lt;span class="pre"&gt;-1}&lt;/span&gt;&lt;/tt&gt; (The first &lt;tt class="docutils literal"&gt;modulo&lt;/tt&gt; just adds blank pages to the end.)&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Möbius (with patch)&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;interleave(2)&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Möbius (known page count)&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;select &lt;span class="pre"&gt;{1..5&lt;/span&gt; &lt;span class="pre"&gt;10..6}&lt;/span&gt; modulo(1,half) &lt;span class="pre"&gt;{1,-1}&lt;/span&gt;&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Multiple Möbius bands, odd-even&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(4) {1 3 2 4}&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Multiple bands, &amp;quot;modulo 3&amp;quot;&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(6) {1 4 2 5 3 6}&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Second half (smaller) of pages in reverse order&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(1,half) &lt;span class="pre"&gt;{-1}&lt;/span&gt;&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Second half (smaller) of pages in normal order&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(1,half) &lt;span class="pre"&gt;{-1}&lt;/span&gt; modulo(1) &lt;span class="pre"&gt;{-1}&lt;/span&gt;&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;First half (bigger) of pages&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(2) {1 2} modulo(1,half) {1}&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;/tbody&gt;
+&lt;/table&gt;
+&lt;p&gt;I might create more patches for avoiding the weird &lt;tt class="docutils literal"&gt;modulo&lt;/tt&gt; commands…&lt;/p&gt;
+&lt;hr class="docutils" /&gt;
+&lt;table class="docutils footnote" frame="void" id="illustrations" rules="none"&gt;
+&lt;colgroup&gt;&lt;col class="label" /&gt;&lt;col /&gt;&lt;/colgroup&gt;
+&lt;tbody valign="top"&gt;
+&lt;tr&gt;&lt;td class="label"&gt;&lt;a class="fn-backref" href="#footnote-reference-1"&gt;[1]&lt;/a&gt;&lt;/td&gt;&lt;td&gt;Most of the figures in this article are drawn with a single
+page per a side of a sheet. I consider putting more pages on a single side
+of paper to be an implementation detail, because it is not always possible
+(e.g. with too small font) and sometimes you could put more than two pages
+on a single side of paper, which leads to the fact that if you put
+everything on one side of the paper, you can see everything at once and save
+the other side. Not very useful though… My only exception is the booklet
+printing below, because that one seems to be rather common.&lt;/td&gt;&lt;/tr&gt;
+&lt;/tbody&gt;
+&lt;/table&gt;
+&lt;table class="docutils footnote" frame="void" id="ordering" rules="none"&gt;
+&lt;colgroup&gt;&lt;col class="label" /&gt;&lt;col /&gt;&lt;/colgroup&gt;
+&lt;tbody valign="top"&gt;
+&lt;tr&gt;&lt;td class="label"&gt;&lt;a class="fn-backref" href="#footnote-reference-2"&gt;[2]&lt;/a&gt;&lt;/td&gt;&lt;td&gt;See how this neatly puts the first-past-half page right after
+the half of the stack? Awesome!&lt;/td&gt;&lt;/tr&gt;
+&lt;/tbody&gt;
+&lt;/table&gt;
+&lt;table class="docutils footnote" frame="void" id="mistake" rules="none"&gt;
+&lt;colgroup&gt;&lt;col class="label" /&gt;&lt;col /&gt;&lt;/colgroup&gt;
+&lt;tbody valign="top"&gt;
+&lt;tr&gt;&lt;td class="label"&gt;&lt;a class="fn-backref" href="#footnote-reference-3"&gt;[3]&lt;/a&gt;&lt;/td&gt;&lt;td&gt;Also, if you flip the page around the wrong edge, you can just
+rotate the rest of the stack and end up with the correct orientation.&lt;/td&gt;&lt;/tr&gt;
+&lt;/tbody&gt;
+&lt;/table&gt;
+&lt;table class="docutils footnote" frame="void" id="multi-mobius" rules="none"&gt;
+&lt;colgroup&gt;&lt;col class="label" /&gt;&lt;col /&gt;&lt;/colgroup&gt;
+&lt;tbody valign="top"&gt;
+&lt;tr&gt;&lt;td class="label"&gt;&lt;a class="fn-backref" href="#footnote-reference-4"&gt;[4]&lt;/a&gt;&lt;/td&gt;&lt;td&gt;A slight variation for which I can generate the order
+with upstream &lt;tt class="docutils literal"&gt;paperjam&lt;/tt&gt; is using this order on small subsets of pages.
+For example, if you only want to be able to see any two consecutive pages,
+you can do this for just four pages – the order is then 1+3, 2+4, 5+7, 6+8,…
+Since each sheet either contains two odd or two even pages, the following
+page is on different sheet than the previous one. And you can do this
+&amp;quot;modulo 3&amp;quot; to see three pages: 1+4, 2+5, 3+6, 7+10, … This &amp;quot;simulates&amp;quot;
+multiple smaller Möbius bands, but will be probably harder to use.&lt;/td&gt;&lt;/tr&gt;
+&lt;/tbody&gt;
+&lt;/table&gt;
+&lt;/div&gt;
+</content><category term="technology"></category><category term="lifehack"></category><category term="print"></category></entry><entry><title>How to convert CBZ to PDF</title><link href="https://blog.ledoian.cz/cbz-to-pdf.html" rel="alternate"></link><published>2024-02-17T16:55:00+01:00</published><updated>2024-02-17T16:55:00+01:00</updated><author><name>LEdoian</name></author><id>tag:blog.ledoian.cz,2024-02-17:/cbz-to-pdf.html</id><summary type="html">&lt;ol class="arabic simple"&gt;
 &lt;li&gt;Extract the archive (cbz is just a zip, cbr is a rar, …)&lt;/li&gt;
 &lt;li&gt;&lt;dl class="first docutils"&gt;
 &lt;dt&gt;Convert individual pictures to PDF using &lt;tt class="docutils literal"&gt;img2pdf&lt;/tt&gt;&lt;/dt&gt;

output/feeds/technology.atom.xml

@@ -1,5 +1,189 @@
 <?xml version="1.0" encoding="utf-8"?>
-<feed xmlns="http://www.w3.org/2005/Atom"><title>LEdoian's Blog - technology</title><link href="https://blog.ledoian.cz/" rel="alternate"></link><link href="https://blog.ledoian.cz/feeds/technology.atom.xml" rel="self"></link><id>https://blog.ledoian.cz/</id><updated>2024-01-10T16:47:00+01:00</updated><entry><title>About this blog</title><link href="https://blog.ledoian.cz/about-blog.html" rel="alternate"></link><published>2024-01-10T16:47:00+01:00</published><updated>2024-01-10T16:47:00+01:00</updated><author><name>LEdoian</name></author><id>tag:blog.ledoian.cz,2024-01-10:/about-blog.html</id><summary type="html">&lt;p&gt;This is my blog and this article describes its setup and other details about my
+<feed xmlns="http://www.w3.org/2005/Atom"><title>LEdoian's Blog - technology</title><link href="https://blog.ledoian.cz/" rel="alternate"></link><link href="https://blog.ledoian.cz/feeds/technology.atom.xml" rel="self"></link><id>https://blog.ledoian.cz/</id><updated>2024-03-02T18:07:00+01:00</updated><entry><title>Print your stuff on Möbius bands!</title><link href="https://blog.ledoian.cz/mobius-print.html" rel="alternate"></link><published>2024-03-02T18:07:00+01:00</published><updated>2024-03-02T18:07:00+01:00</updated><author><name>LEdoian</name></author><id>tag:blog.ledoian.cz,2024-03-02:/mobius-print.html</id><summary type="html">&lt;p&gt;I found a fun and useful way of printing stuff to ~~both~~all sides of a paper.
+I just need to find the right printer!&lt;/p&gt;
+&lt;div class="section" id="quick-recap-how-to-conventionally-print-stuff-two-sided"&gt;
+&lt;h2&gt;Quick recap: how to conventionally print stuff two-sided&lt;/h2&gt;
+&lt;p&gt;A typical way is just sending the page to get printed two-sided (with setting
+the correct way …&lt;/p&gt;&lt;/div&gt;</summary><content type="html">&lt;p&gt;I found a fun and useful way of printing stuff to ~~both~~all sides of a paper.
+I just need to find the right printer!&lt;/p&gt;
+&lt;div class="section" id="quick-recap-how-to-conventionally-print-stuff-two-sided"&gt;
+&lt;h2&gt;Quick recap: how to conventionally print stuff two-sided&lt;/h2&gt;
+&lt;p&gt;A typical way is just sending the page to get printed two-sided (with setting
+the correct way of flipping pages). That is, on the other side of page 1 is
+page 2, next sheet contains pages 3,4, then 5 &amp;amp; 6, …&lt;/p&gt;
+&lt;p&gt;This is usually trivial to print on duplex printers, a bit hard to simulate on
+one-sided printers (but some drivers can do that) and has drawbacks when you
+need to look at stuff on other pages at the same time – you need to flip the
+sheet often, as you only can put half of the pairs of pages next to each other
+(even one and the following odd one).&lt;/p&gt;
+&lt;div class="figure"&gt;
+&lt;object data="https://blog.ledoian.cz/images/mobius-print/twoside.svg" style="width: 66%;" type="image/svg+xml"&gt;&lt;/object&gt;
+&lt;p class="caption"&gt;Ordinary two-sided printing. Red arrows show sheet flips between consecutive
+pages.&lt;/p&gt;
+&lt;/div&gt;
+&lt;p&gt;A slight improvement hack is putting two pages on the same side of the paper
+(works well with A-series of papers, I don't know for Letters &amp;amp;co.) – you can
+put up to four pages of the original document next to each other, if they are
+the right ones, but there are still pairs of pages that need turning sheets.
+Also only works if the original pages do not have too tiny features on them.
+&lt;a class="footnote-reference" href="#illustrations" id="footnote-reference-1"&gt;[1]&lt;/a&gt;&lt;/p&gt;
+&lt;p&gt;Booklets are fun and approachable, but still suffer from the same issues as the
+conventional duplex print. They might be a bit hard to print, but programs like
+&lt;tt class="docutils literal"&gt;pdfbook&lt;/tt&gt; or &lt;tt class="docutils literal"&gt;paperjam&lt;/tt&gt; make it easy to prepare for the classic duplex
+printing. Also, it is maybe hard to tell which page ends up where, as the order
+is: last+first, second+penultimate, third-from-end+third, … until the pages
+meet in the middle.&lt;/p&gt;
+&lt;div class="figure"&gt;
+&lt;object data="https://blog.ledoian.cz/images/mobius-print/booklet.svg" style="width: 66%;" type="image/svg+xml"&gt;&lt;/object&gt;
+&lt;p class="caption"&gt;The most common booklet order with two pages per side for landscape
+orientation. (Note that we show more pages, and thus more sheet-flips; the
+number of sheet-flips is in fact the same as for two-sided printing.)&lt;/p&gt;
+&lt;/div&gt;
+&lt;/div&gt;
+&lt;div class="section" id="the-improvement-for-seeing-multiple-consecutive-pages"&gt;
+&lt;h2&gt;The improvement for seeing multiple consecutive pages&lt;/h2&gt;
+&lt;p&gt;In order to be able to look simultaneously at many consecutive pages of the
+original, I think the order of first+first-past-half, second+second-past-half,
+… middle+last is much better (or maybe even the best).  Since consecutive pages
+end up on different sheets (whenever there are at least three pages), if the
+original has e.g. figures on different page or long code listing, you can see
+it all!&lt;/p&gt;
+&lt;div class="figure"&gt;
+&lt;object data="https://blog.ledoian.cz/images/mobius-print/mobius.svg" style="width: 66%;" type="image/svg+xml"&gt;&lt;/object&gt;
+&lt;p class="caption"&gt;The &amp;quot;Möbius order&amp;quot; of pages.&lt;/p&gt;
+&lt;/div&gt;
+&lt;p&gt;And this is really easy to use: You read a page and when you don't need it
+anymore, you flip it and put to the end of the page stack &lt;a class="footnote-reference" href="#ordering" id="footnote-reference-2"&gt;[2]&lt;/a&gt;. If you
+need to look at several pages, just rotate them in the same order as they go the
+first time. &lt;a class="footnote-reference" href="#mistake" id="footnote-reference-3"&gt;[3]&lt;/a&gt;&lt;/p&gt;
+&lt;p&gt;Need to print this? For one-sided printers this is rather easy, too: just print
+the first half (the bigger one) on the sheets, then put them back into the tray
+and print the rest on them. You might need to experiment which side the sheets
+should be put in and whether you need to print the rest in reverse order, but
+that is it.&lt;/p&gt;
+&lt;p&gt;Got the pages shuffled? Sort them by the first half, as if the print was
+one-sided.&lt;/p&gt;
+&lt;p&gt;The only annoying thing for me is that there is not much software that could
+reorder the pages for two-sided printing, so that you don't need to re-insert
+the sheets back in the tray. So I &lt;a class="reference external" href="https://blog.ledoian.cz/images/mobius-print/interleave.patch"&gt;patched&lt;/a&gt; &lt;a class="reference external" href="https://mj.ucw.cz/sw/paperjam/"&gt;paperjam&lt;/a&gt; to enable this. &lt;a class="footnote-reference" href="#multi-mobius" id="footnote-reference-4"&gt;[4]&lt;/a&gt;&lt;/p&gt;
+&lt;p&gt;And the best part? If you would try to glue consecutive pages side-to-side,
+you'd end up with a Möbius band! So if you get a Möbius paper, you can just
+print this one-sided (duh :-D)&lt;/p&gt;
+&lt;/div&gt;
+&lt;div class="section" id="honorable-mention-leporello"&gt;
+&lt;h2&gt;Honorable mention: leporello&lt;/h2&gt;
+&lt;p&gt;Printing leporellos (aka concertina folded) also has many of the same benefits,
+since there is only one pair of consecutive pages that need a page flip. The
+order is first+last, second+penultimate, … and the original pages can be
+shuffled this way with &lt;tt class="docutils literal"&gt;paperjam&lt;/tt&gt; or simply using the other order for the
+second side printing, than for the Möbius band. But there is a bit of fun
+topology missing here :-)&lt;/p&gt;
+&lt;div class="figure"&gt;
+&lt;object data="https://blog.ledoian.cz/images/mobius-print/leporello.svg" style="width: 66%;" type="image/svg+xml"&gt;&lt;/object&gt;
+&lt;p class="caption"&gt;A leporello order is also quite good, with only one sheet-flip in the entire
+document.&lt;/p&gt;
+&lt;/div&gt;
+&lt;/div&gt;
+&lt;div class="section" id="is-this-the-best-order"&gt;
+&lt;h2&gt;Is this the best order?&lt;/h2&gt;
+&lt;p&gt;Yes, if &amp;quot;best&amp;quot; means &amp;quot;the minimum difference of numbers of pages that get put
+on the same sheet is as big as possible&amp;quot;. The proof is left as an exercise for
+the reader.&lt;/p&gt;
+&lt;!-- Hint: you cannot pair the middle page to anything else to get a better
+result. --&gt;
+&lt;p&gt;Of course, this holds for a set of pages with no additional assumptions. In
+ordinary print, having a sheet-turn between chapters is fine and under similar
+guarantees other approaches may yield better results.&lt;/p&gt;
+&lt;/div&gt;
+&lt;div class="section" id="cheat-sheet-paperjam-commands"&gt;
+&lt;h2&gt;Cheat sheet: paperjam commands&lt;/h2&gt;
+&lt;table border="1" class="docutils"&gt;
+&lt;caption&gt;Various commands for ordering pages for duplex printing with paperjam.&lt;/caption&gt;
+&lt;thead valign="bottom"&gt;
+&lt;tr&gt;&lt;th class="head"&gt;Order&lt;/th&gt;
+&lt;th class="head"&gt;Command&lt;/th&gt;
+&lt;/tr&gt;
+&lt;/thead&gt;
+&lt;tbody valign="top"&gt;
+&lt;tr&gt;&lt;td&gt;Classic two-sided&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;null&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Two pages per side&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;nup(2)&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Booklet&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;book&lt;/tt&gt; (follow with &lt;tt class="docutils literal"&gt;nup(2)&lt;/tt&gt; for actual booklet print)&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Leporello&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(2) {1 2} modulo(1,half) {1 &lt;span class="pre"&gt;-1}&lt;/span&gt;&lt;/tt&gt; (The first &lt;tt class="docutils literal"&gt;modulo&lt;/tt&gt; just adds blank pages to the end.)&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Möbius (with patch)&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;interleave(2)&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Möbius (known page count)&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;select &lt;span class="pre"&gt;{1..5&lt;/span&gt; &lt;span class="pre"&gt;10..6}&lt;/span&gt; modulo(1,half) &lt;span class="pre"&gt;{1,-1}&lt;/span&gt;&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Multiple Möbius bands, odd-even&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(4) {1 3 2 4}&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Multiple bands, &amp;quot;modulo 3&amp;quot;&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(6) {1 4 2 5 3 6}&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Second half (smaller) of pages in reverse order&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(1,half) &lt;span class="pre"&gt;{-1}&lt;/span&gt;&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;Second half (smaller) of pages in normal order&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(1,half) &lt;span class="pre"&gt;{-1}&lt;/span&gt; modulo(1) &lt;span class="pre"&gt;{-1}&lt;/span&gt;&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;tr&gt;&lt;td&gt;First half (bigger) of pages&lt;/td&gt;
+&lt;td&gt;&lt;tt class="docutils literal"&gt;modulo(2) {1 2} modulo(1,half) {1}&lt;/tt&gt;&lt;/td&gt;
+&lt;/tr&gt;
+&lt;/tbody&gt;
+&lt;/table&gt;
+&lt;p&gt;I might create more patches for avoiding the weird &lt;tt class="docutils literal"&gt;modulo&lt;/tt&gt; commands…&lt;/p&gt;
+&lt;hr class="docutils" /&gt;
+&lt;table class="docutils footnote" frame="void" id="illustrations" rules="none"&gt;
+&lt;colgroup&gt;&lt;col class="label" /&gt;&lt;col /&gt;&lt;/colgroup&gt;
+&lt;tbody valign="top"&gt;
+&lt;tr&gt;&lt;td class="label"&gt;&lt;a class="fn-backref" href="#footnote-reference-1"&gt;[1]&lt;/a&gt;&lt;/td&gt;&lt;td&gt;Most of the figures in this article are drawn with a single
+page per a side of a sheet. I consider putting more pages on a single side
+of paper to be an implementation detail, because it is not always possible
+(e.g. with too small font) and sometimes you could put more than two pages
+on a single side of paper, which leads to the fact that if you put
+everything on one side of the paper, you can see everything at once and save
+the other side. Not very useful though… My only exception is the booklet
+printing below, because that one seems to be rather common.&lt;/td&gt;&lt;/tr&gt;
+&lt;/tbody&gt;
+&lt;/table&gt;
+&lt;table class="docutils footnote" frame="void" id="ordering" rules="none"&gt;
+&lt;colgroup&gt;&lt;col class="label" /&gt;&lt;col /&gt;&lt;/colgroup&gt;
+&lt;tbody valign="top"&gt;
+&lt;tr&gt;&lt;td class="label"&gt;&lt;a class="fn-backref" href="#footnote-reference-2"&gt;[2]&lt;/a&gt;&lt;/td&gt;&lt;td&gt;See how this neatly puts the first-past-half page right after
+the half of the stack? Awesome!&lt;/td&gt;&lt;/tr&gt;
+&lt;/tbody&gt;
+&lt;/table&gt;
+&lt;table class="docutils footnote" frame="void" id="mistake" rules="none"&gt;
+&lt;colgroup&gt;&lt;col class="label" /&gt;&lt;col /&gt;&lt;/colgroup&gt;
+&lt;tbody valign="top"&gt;
+&lt;tr&gt;&lt;td class="label"&gt;&lt;a class="fn-backref" href="#footnote-reference-3"&gt;[3]&lt;/a&gt;&lt;/td&gt;&lt;td&gt;Also, if you flip the page around the wrong edge, you can just
+rotate the rest of the stack and end up with the correct orientation.&lt;/td&gt;&lt;/tr&gt;
+&lt;/tbody&gt;
+&lt;/table&gt;
+&lt;table class="docutils footnote" frame="void" id="multi-mobius" rules="none"&gt;
+&lt;colgroup&gt;&lt;col class="label" /&gt;&lt;col /&gt;&lt;/colgroup&gt;
+&lt;tbody valign="top"&gt;
+&lt;tr&gt;&lt;td class="label"&gt;&lt;a class="fn-backref" href="#footnote-reference-4"&gt;[4]&lt;/a&gt;&lt;/td&gt;&lt;td&gt;A slight variation for which I can generate the order
+with upstream &lt;tt class="docutils literal"&gt;paperjam&lt;/tt&gt; is using this order on small subsets of pages.
+For example, if you only want to be able to see any two consecutive pages,
+you can do this for just four pages – the order is then 1+3, 2+4, 5+7, 6+8,…
+Since each sheet either contains two odd or two even pages, the following
+page is on different sheet than the previous one. And you can do this
+&amp;quot;modulo 3&amp;quot; to see three pages: 1+4, 2+5, 3+6, 7+10, … This &amp;quot;simulates&amp;quot;
+multiple smaller Möbius bands, but will be probably harder to use.&lt;/td&gt;&lt;/tr&gt;
+&lt;/tbody&gt;
+&lt;/table&gt;
+&lt;/div&gt;
+</content><category term="technology"></category><category term="lifehack"></category><category term="print"></category></entry><entry><title>About this blog</title><link href="https://blog.ledoian.cz/about-blog.html" rel="alternate"></link><published>2024-01-10T16:47:00+01:00</published><updated>2024-01-10T16:47:00+01:00</updated><author><name>LEdoian</name></author><id>tag:blog.ledoian.cz,2024-01-10:/about-blog.html</id><summary type="html">&lt;p&gt;This is my blog and this article describes its setup and other details about my
 intentions. The actual &lt;a class="reference internal" href="#the-setup"&gt;setup&lt;/a&gt; is probably the most
 interesting tech-wise.&lt;/p&gt;
 &lt;div class="section" id="what-is-this"&gt;

output/forgetting-dns6.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="./tag/lifehack.html">lifehack</a></li>
+	<li><a href="./tag/print.html">print</a></li>
 	<li><a href="./tag/comics.html">comics</a></li>
 	<li><a href="./tag/software.html">software</a></li>
 	<li><a href="./tag/ipv6-only.html">ipv6-only</a></li>

output/images/mobius-print/Makefile

@@ -0,0 +1,6 @@
+all: booklet.svg mobius.svg leporello.svg booklet.svg
+
+%.svg: %.ipe
+	iperender -svg "$<" "$@"
+
+.PHONY: all

output/images/mobius-print/booklet.ipe

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output/images/mobius-print/interleave.patch

@@ -0,0 +1,99 @@
+From b32e0a3e27142898e87e13464154d4f9d8c5e96e Mon Sep 17 00:00:00 2001
+From: LEdoian <paperjam@pokemon.ledoian.cz>
+Date: Sat, 2 Mar 2024 01:20:25 +0100
+Subject: [PATCH] Implemented interleave
+
+---
+SPDX-License-Identifier: GPL-2.0-or-later
+
+ cmds.cc        | 39 +++++++++++++++++++++++++++++++++++++++
+ paperjam.1.txt | 10 ++++++++++
+ 2 files changed, 49 insertions(+)
+
+diff --git a/cmds.cc b/cmds.cc
+index a2ac331..49590a5 100644
+--- a/cmds.cc
++++ b/cmds.cc
+@@ -2,6 +2,7 @@
+  *	PaperJam -- Commands
+  *
+  *	(c) 2018--2022 Martin Mares <mj@ucw.cz>
++ *	(c) 2024 LEdoian <paperjam@pokemon.ledoian.cz>
+  */
+ 
+ #include <cassert>
+@@ -1490,6 +1491,42 @@ static const arg_def slice_args[] = {
+   { NULL,	0,				NULL }
+ };
+ 
++/*** interleave ***/
++
++class interleave_cmd : public cmd_exec {
++  int n;
++public:
++  interleave_cmd(cmd *c)
++    {
++      n = c->arg("n")->as_int(0);
++      if (n <= 0)
++	err("The number of interleaving groups must be positive");
++    }
++  vector<page *> process(vector<page *> &pages) override;
++};
++
++vector<page *> interleave_cmd::process(vector<page *> &pages)
++{
++  vector<page *> in, out;
++
++  in = pages;
++  // The last page may be superfluous...
++  while (in.size() % n)
++    in.push_back(new empty_page(in[0]->width, in[0]->height));
++  int split = (int) in.size() / n;
++
++  for (int i=0; i<split; i++)
++    for (int j=0; j<n; j++)
++       out.push_back(in[j*split+i]);
++
++  return out;
++}
++
++static const arg_def interleave_args[] = {
++  { "n",	AT_INT | AT_POSITIONAL | AT_MANDATORY,	"Number of interleaving groups" },
++  { NULL,	0,					NULL }
++};
++
+ /*** Command table ***/
+ 
+ template<typename T> cmd_exec *ctor(cmd *c) { return new T(c); }
+@@ -1515,6 +1552,8 @@ const cmd_def cmd_table[] = {
+ 		"Fit image to a given paper" },
+   { "flip",	flip_args,	0,	&ctor<flip_cmd>,
+ 		"Flip page horizontally and/or vertically" },
++  { "interleave",	interleave_args,	0,	&ctor<interleave_cmd>,
++		"Interleave pages from different parts of the document" },
+   { "margins",	margins_args,	0,	&ctor<margins_cmd>,
+ 		"Define image box by dimensions of margins around it" },
+   { "merge",	no_args,	0,	&ctor<merge_cmd>,
+diff --git a/paperjam.1.txt b/paperjam.1.txt
+index 94f3432..9bebcd4 100644
+--- a/paperjam.1.txt
++++ b/paperjam.1.txt
+@@ -255,6 +255,16 @@ Flip pages horizontally or vertically.
+ *v=*'switch'::
+ 	Flip vertically.
+ 
++interleave
++~~~~~~~~~~
++Splits the document into n groups of same size and interleaves them (first page
++from all groups, then second, ...).
++
++If the number of input pages is not divisible by n, blank pages are added.
++
++*n=*'number'::
++	Number of groups.
++
+ margins
+ ~~~~~~~
+ Define a new image box by dimensions of margins around it. More technically,
+-- 
+2.43.0

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+</g>
+<path fill="none" stroke-width="0.4" stroke-linecap="butt" stroke-linejoin="round" stroke="rgb(100%, 0%, 0%)" stroke-opacity="1" stroke-miterlimit="10" d="M 168 712 L 168 680 " transform="matrix(1, 0, 0, -1, -74, 769)"/>
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+<path fill-rule="evenodd" fill="rgb(100%, 0%, 0%)" fill-opacity="1" stroke-width="0.4" stroke-linecap="butt" stroke-linejoin="round" stroke="rgb(100%, 0%, 0%)" stroke-opacity="1" stroke-miterlimit="10" d="M 344 680 L 346.332031 687 L 341.667969 687 Z M 344 680 " transform="matrix(1, 0, 0, -1, -74, 769)"/>
+</svg>

output/index.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="./tag/lifehack.html">lifehack</a></li>
+	<li><a href="./tag/print.html">print</a></li>
 	<li><a href="./tag/comics.html">comics</a></li>
 	<li><a href="./tag/software.html">software</a></li>
 	<li><a href="./tag/ipv6-only.html">ipv6-only</a></li>

output/mobius-print.html

@@ -0,0 +1,252 @@
+<!doctype html>
+<html>
+<head>
+	<meta charset=utf-8>
+	<meta name=generator content="Pelican 4.9.1">
+	<meta name=author content="LEdoian">
+	<meta name=description content="My personal webpage">
+	<meta name=referrer content=no-referrer>
+
+
+	<link rel=stylesheet href="./theme/css/theme.css">
+
+	<title>Print your stuff on Möbius bands! – LEdoian's Blog</title>
+</head>
+<body>
+
+<header>
+<h1>LEdoian's Blog</h1>
+</header>
+
+<div id=main>
+<nav>
+<div>
+	<!-- Main navigation -->
+	<!-- TODO! -->
+</div>
+<div>
+	<h2>Categories</h2>
+	<ul>
+	<li><a href="./category/networking.html">networking</a></li>
+	<li><a href="./category/talks.html">talks</a></li>
+	<li><a href="./category/technology.html">technology</a></li>
+	<li><a href="./category/til.html">til</a></li>
+	</ul>
+
+	<h2>Tags</h2>
+	<ul>
+	<li><a href="./tag/lifehack.html">lifehack</a></li>
+	<li><a href="./tag/print.html">print</a></li>
+	<li><a href="./tag/comics.html">comics</a></li>
+	<li><a href="./tag/software.html">software</a></li>
+	<li><a href="./tag/ipv6-only.html">ipv6-only</a></li>
+	<li><a href="./tag/dns.html">dns</a></li>
+	<li><a href="./tag/meta.html">meta</a></li>
+	<li><a href="./tag/infrastructure.html">infrastructure</a></li>
+	<li><a href="./tag/smrst.html">smršť</a></li>
+	<li><a href="./tag/trains.html">trains</a></li>
+	<li><a href="./tag/software-engineering.html">software-engineering</a></li>
+	</ul>
+</div>
+<div>
+	<h2>Stalk me also at</h2>
+	TODO!
+
+	<h2>I stalk</h2>
+	TODO!
+</nav>
+
+<main>
+	<div>
+<h1>Print your stuff on Möbius bands!</h1>
+<p>I found a fun and useful way of printing stuff to ~~both~~all sides of a paper.
+I just need to find the right printer!</p>
+<div class="section" id="quick-recap-how-to-conventionally-print-stuff-two-sided">
+<h2>Quick recap: how to conventionally print stuff two-sided</h2>
+<p>A typical way is just sending the page to get printed two-sided (with setting
+the correct way of flipping pages). That is, on the other side of page 1 is
+page 2, next sheet contains pages 3,4, then 5 &amp; 6, …</p>
+<p>This is usually trivial to print on duplex printers, a bit hard to simulate on
+one-sided printers (but some drivers can do that) and has drawbacks when you
+need to look at stuff on other pages at the same time – you need to flip the
+sheet often, as you only can put half of the pairs of pages next to each other
+(even one and the following odd one).</p>
+<div class="figure">
+<object data="./images/mobius-print/twoside.svg" style="width: 66%;" type="image/svg+xml"></object>
+<p class="caption">Ordinary two-sided printing. Red arrows show sheet flips between consecutive
+pages.</p>
+</div>
+<p>A slight improvement hack is putting two pages on the same side of the paper
+(works well with A-series of papers, I don't know for Letters &amp;co.) – you can
+put up to four pages of the original document next to each other, if they are
+the right ones, but there are still pairs of pages that need turning sheets.
+Also only works if the original pages do not have too tiny features on them.
+<a class="footnote-reference" href="#illustrations" id="footnote-reference-1">[1]</a></p>
+<p>Booklets are fun and approachable, but still suffer from the same issues as the
+conventional duplex print. They might be a bit hard to print, but programs like
+<tt class="docutils literal">pdfbook</tt> or <tt class="docutils literal">paperjam</tt> make it easy to prepare for the classic duplex
+printing. Also, it is maybe hard to tell which page ends up where, as the order
+is: last+first, second+penultimate, third-from-end+third, … until the pages
+meet in the middle.</p>
+<div class="figure">
+<object data="./images/mobius-print/booklet.svg" style="width: 66%;" type="image/svg+xml"></object>
+<p class="caption">The most common booklet order with two pages per side for landscape
+orientation. (Note that we show more pages, and thus more sheet-flips; the
+number of sheet-flips is in fact the same as for two-sided printing.)</p>
+</div>
+</div>
+<div class="section" id="the-improvement-for-seeing-multiple-consecutive-pages">
+<h2>The improvement for seeing multiple consecutive pages</h2>
+<p>In order to be able to look simultaneously at many consecutive pages of the
+original, I think the order of first+first-past-half, second+second-past-half,
+… middle+last is much better (or maybe even the best).  Since consecutive pages
+end up on different sheets (whenever there are at least three pages), if the
+original has e.g. figures on different page or long code listing, you can see
+it all!</p>
+<div class="figure">
+<object data="./images/mobius-print/mobius.svg" style="width: 66%;" type="image/svg+xml"></object>
+<p class="caption">The &quot;Möbius order&quot; of pages.</p>
+</div>
+<p>And this is really easy to use: You read a page and when you don't need it
+anymore, you flip it and put to the end of the page stack <a class="footnote-reference" href="#ordering" id="footnote-reference-2">[2]</a>. If you
+need to look at several pages, just rotate them in the same order as they go the
+first time. <a class="footnote-reference" href="#mistake" id="footnote-reference-3">[3]</a></p>
+<p>Need to print this? For one-sided printers this is rather easy, too: just print
+the first half (the bigger one) on the sheets, then put them back into the tray
+and print the rest on them. You might need to experiment which side the sheets
+should be put in and whether you need to print the rest in reverse order, but
+that is it.</p>
+<p>Got the pages shuffled? Sort them by the first half, as if the print was
+one-sided.</p>
+<p>The only annoying thing for me is that there is not much software that could
+reorder the pages for two-sided printing, so that you don't need to re-insert
+the sheets back in the tray. So I <a class="reference external" href="./images/mobius-print/interleave.patch">patched</a> <a class="reference external" href="https://mj.ucw.cz/sw/paperjam/">paperjam</a> to enable this. <a class="footnote-reference" href="#multi-mobius" id="footnote-reference-4">[4]</a></p>
+<p>And the best part? If you would try to glue consecutive pages side-to-side,
+you'd end up with a Möbius band! So if you get a Möbius paper, you can just
+print this one-sided (duh :-D)</p>
+</div>
+<div class="section" id="honorable-mention-leporello">
+<h2>Honorable mention: leporello</h2>
+<p>Printing leporellos (aka concertina folded) also has many of the same benefits,
+since there is only one pair of consecutive pages that need a page flip. The
+order is first+last, second+penultimate, … and the original pages can be
+shuffled this way with <tt class="docutils literal">paperjam</tt> or simply using the other order for the
+second side printing, than for the Möbius band. But there is a bit of fun
+topology missing here :-)</p>
+<div class="figure">
+<object data="./images/mobius-print/leporello.svg" style="width: 66%;" type="image/svg+xml"></object>
+<p class="caption">A leporello order is also quite good, with only one sheet-flip in the entire
+document.</p>
+</div>
+</div>
+<div class="section" id="is-this-the-best-order">
+<h2>Is this the best order?</h2>
+<p>Yes, if &quot;best&quot; means &quot;the minimum difference of numbers of pages that get put
+on the same sheet is as big as possible&quot;. The proof is left as an exercise for
+the reader.</p>
+<!-- Hint: you cannot pair the middle page to anything else to get a better
+result. -->
+<p>Of course, this holds for a set of pages with no additional assumptions. In
+ordinary print, having a sheet-turn between chapters is fine and under similar
+guarantees other approaches may yield better results.</p>
+</div>
+<div class="section" id="cheat-sheet-paperjam-commands">
+<h2>Cheat sheet: paperjam commands</h2>
+<table border="1" class="docutils">
+<caption>Various commands for ordering pages for duplex printing with paperjam.</caption>
+<thead valign="bottom">
+<tr><th class="head">Order</th>
+<th class="head">Command</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr><td>Classic two-sided</td>
+<td><tt class="docutils literal">null</tt></td>
+</tr>
+<tr><td>Two pages per side</td>
+<td><tt class="docutils literal">nup(2)</tt></td>
+</tr>
+<tr><td>Booklet</td>
+<td><tt class="docutils literal">book</tt> (follow with <tt class="docutils literal">nup(2)</tt> for actual booklet print)</td>
+</tr>
+<tr><td>Leporello</td>
+<td><tt class="docutils literal">modulo(2) {1 2} modulo(1,half) {1 <span class="pre">-1}</span></tt> (The first <tt class="docutils literal">modulo</tt> just adds blank pages to the end.)</td>
+</tr>
+<tr><td>Möbius (with patch)</td>
+<td><tt class="docutils literal">interleave(2)</tt></td>
+</tr>
+<tr><td>Möbius (known page count)</td>
+<td><tt class="docutils literal">select <span class="pre">{1..5</span> <span class="pre">10..6}</span> modulo(1,half) <span class="pre">{1,-1}</span></tt></td>
+</tr>
+<tr><td>Multiple Möbius bands, odd-even</td>
+<td><tt class="docutils literal">modulo(4) {1 3 2 4}</tt></td>
+</tr>
+<tr><td>Multiple bands, &quot;modulo 3&quot;</td>
+<td><tt class="docutils literal">modulo(6) {1 4 2 5 3 6}</tt></td>
+</tr>
+<tr><td>Second half (smaller) of pages in reverse order</td>
+<td><tt class="docutils literal">modulo(1,half) <span class="pre">{-1}</span></tt></td>
+</tr>
+<tr><td>Second half (smaller) of pages in normal order</td>
+<td><tt class="docutils literal">modulo(1,half) <span class="pre">{-1}</span> modulo(1) <span class="pre">{-1}</span></tt></td>
+</tr>
+<tr><td>First half (bigger) of pages</td>
+<td><tt class="docutils literal">modulo(2) {1 2} modulo(1,half) {1}</tt></td>
+</tr>
+</tbody>
+</table>
+<p>I might create more patches for avoiding the weird <tt class="docutils literal">modulo</tt> commands…</p>
+<hr class="docutils" />
+<table class="docutils footnote" frame="void" id="illustrations" rules="none">
+<colgroup><col class="label" /><col /></colgroup>
+<tbody valign="top">
+<tr><td class="label"><a class="fn-backref" href="#footnote-reference-1">[1]</a></td><td>Most of the figures in this article are drawn with a single
+page per a side of a sheet. I consider putting more pages on a single side
+of paper to be an implementation detail, because it is not always possible
+(e.g. with too small font) and sometimes you could put more than two pages
+on a single side of paper, which leads to the fact that if you put
+everything on one side of the paper, you can see everything at once and save
+the other side. Not very useful though… My only exception is the booklet
+printing below, because that one seems to be rather common.</td></tr>
+</tbody>
+</table>
+<table class="docutils footnote" frame="void" id="ordering" rules="none">
+<colgroup><col class="label" /><col /></colgroup>
+<tbody valign="top">
+<tr><td class="label"><a class="fn-backref" href="#footnote-reference-2">[2]</a></td><td>See how this neatly puts the first-past-half page right after
+the half of the stack? Awesome!</td></tr>
+</tbody>
+</table>
+<table class="docutils footnote" frame="void" id="mistake" rules="none">
+<colgroup><col class="label" /><col /></colgroup>
+<tbody valign="top">
+<tr><td class="label"><a class="fn-backref" href="#footnote-reference-3">[3]</a></td><td>Also, if you flip the page around the wrong edge, you can just
+rotate the rest of the stack and end up with the correct orientation.</td></tr>
+</tbody>
+</table>
+<table class="docutils footnote" frame="void" id="multi-mobius" rules="none">
+<colgroup><col class="label" /><col /></colgroup>
+<tbody valign="top">
+<tr><td class="label"><a class="fn-backref" href="#footnote-reference-4">[4]</a></td><td>A slight variation for which I can generate the order
+with upstream <tt class="docutils literal">paperjam</tt> is using this order on small subsets of pages.
+For example, if you only want to be able to see any two consecutive pages,
+you can do this for just four pages – the order is then 1+3, 2+4, 5+7, 6+8,…
+Since each sheet either contains two odd or two even pages, the following
+page is on different sheet than the previous one. And you can do this
+&quot;modulo 3&quot; to see three pages: 1+4, 2+5, 3+6, 7+10, … This &quot;simulates&quot;
+multiple smaller Möbius bands, but will be probably harder to use.</td></tr>
+</tbody>
+</table>
+</div>
+
+	</div>
+</main>
+</div> <!-- #main -->
+
+<footer>
+<hr>
+Written using Pelican 4.9.1 by LEdoian.
+</footer>
+
+</body>
+</html>

output/smrst2023-cs.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="./tag/lifehack.html">lifehack</a></li>
+	<li><a href="./tag/print.html">print</a></li>
 	<li><a href="./tag/comics.html">comics</a></li>
 	<li><a href="./tag/software.html">software</a></li>
 	<li><a href="./tag/ipv6-only.html">ipv6-only</a></li>

output/tag/comics.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/tag/dns.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/tag/infrastructure.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/tag/ipv6-only.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/tag/lifehack.html

@@ -0,0 +1,74 @@
+<!doctype html>
+<html>
+<head>
+	<meta charset=utf-8>
+	<meta name=generator content="Pelican 4.9.1">
+	<meta name=author content="LEdoian">
+	<meta name=description content="My personal webpage">
+	<meta name=referrer content=no-referrer>
+
+
+	<link rel=stylesheet href="../theme/css/theme.css">
+
+	<title>Tag: lifehack – LEdoian's Blog</title>
+</head>
+<body>
+
+<header>
+<h1>LEdoian's Blog</h1>
+</header>
+
+<div id=main>
+<nav>
+<div>
+	<!-- Main navigation -->
+	<!-- TODO! -->
+</div>
+<div>
+	<h2>Categories</h2>
+	<ul>
+	<li><a href="../category/networking.html">networking</a></li>
+	<li><a href="../category/talks.html">talks</a></li>
+	<li><a href="../category/technology.html">technology</a></li>
+	<li><a href="../category/til.html">til</a></li>
+	</ul>
+
+	<h2>Tags</h2>
+	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
+	<li><a href="../tag/comics.html">comics</a></li>
+	<li><a href="../tag/software.html">software</a></li>
+	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>
+	<li><a href="../tag/dns.html">dns</a></li>
+	<li><a href="../tag/meta.html">meta</a></li>
+	<li><a href="../tag/infrastructure.html">infrastructure</a></li>
+	<li><a href="../tag/smrst.html">smršť</a></li>
+	<li><a href="../tag/trains.html">trains</a></li>
+	<li><a href="../tag/software-engineering.html">software-engineering</a></li>
+	</ul>
+</div>
+<div>
+	<h2>Stalk me also at</h2>
+	TODO!
+
+	<h2>I stalk</h2>
+	TODO!
+</nav>
+
+<main>
+	<div>
+<h1>Articles tagged with lifehack</h1>
+<ul> <li><a href="../mobius-print.html">Print your stuff on Möbius bands!</a>
+</ul>
+	</div>
+</main>
+</div> <!-- #main -->
+
+<footer>
+<hr>
+Written using Pelican 4.9.1 by LEdoian.
+</footer>
+
+</body>
+</html>

output/tag/meta.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/tag/print.html

@@ -0,0 +1,74 @@
+<!doctype html>
+<html>
+<head>
+	<meta charset=utf-8>
+	<meta name=generator content="Pelican 4.9.1">
+	<meta name=author content="LEdoian">
+	<meta name=description content="My personal webpage">
+	<meta name=referrer content=no-referrer>
+
+
+	<link rel=stylesheet href="../theme/css/theme.css">
+
+	<title>Tag: print – LEdoian's Blog</title>
+</head>
+<body>
+
+<header>
+<h1>LEdoian's Blog</h1>
+</header>
+
+<div id=main>
+<nav>
+<div>
+	<!-- Main navigation -->
+	<!-- TODO! -->
+</div>
+<div>
+	<h2>Categories</h2>
+	<ul>
+	<li><a href="../category/networking.html">networking</a></li>
+	<li><a href="../category/talks.html">talks</a></li>
+	<li><a href="../category/technology.html">technology</a></li>
+	<li><a href="../category/til.html">til</a></li>
+	</ul>
+
+	<h2>Tags</h2>
+	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
+	<li><a href="../tag/comics.html">comics</a></li>
+	<li><a href="../tag/software.html">software</a></li>
+	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>
+	<li><a href="../tag/dns.html">dns</a></li>
+	<li><a href="../tag/meta.html">meta</a></li>
+	<li><a href="../tag/infrastructure.html">infrastructure</a></li>
+	<li><a href="../tag/smrst.html">smršť</a></li>
+	<li><a href="../tag/trains.html">trains</a></li>
+	<li><a href="../tag/software-engineering.html">software-engineering</a></li>
+	</ul>
+</div>
+<div>
+	<h2>Stalk me also at</h2>
+	TODO!
+
+	<h2>I stalk</h2>
+	TODO!
+</nav>
+
+<main>
+	<div>
+<h1>Articles tagged with print</h1>
+<ul> <li><a href="../mobius-print.html">Print your stuff on Möbius bands!</a>
+</ul>
+	</div>
+</main>
+</div> <!-- #main -->
+
+<footer>
+<hr>
+Written using Pelican 4.9.1 by LEdoian.
+</footer>
+
+</body>
+</html>

output/tag/smrst.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/tag/software-engineering.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/tag/software.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/tag/trains.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="../tag/lifehack.html">lifehack</a></li>
+	<li><a href="../tag/print.html">print</a></li>
 	<li><a href="../tag/comics.html">comics</a></li>
 	<li><a href="../tag/software.html">software</a></li>
 	<li><a href="../tag/ipv6-only.html">ipv6-only</a></li>

output/tags.html

@@ -35,6 +35,8 @@
 
 	<h2>Tags</h2>
 	<ul>
+	<li><a href="./tag/lifehack.html">lifehack</a></li>
+	<li><a href="./tag/print.html">print</a></li>
 	<li><a href="./tag/comics.html">comics</a></li>
 	<li><a href="./tag/software.html">software</a></li>
 	<li><a href="./tag/ipv6-only.html">ipv6-only</a></li>