Posts in the “technology” category

It’s almost all on your cellphone

Almost every product on this 1991 Radio Shack ad is now on your cellphone (sans the scanner and radar detector).

How to use a non-default table column separator in Asciidoc

As a brief note, if you ever need to use a different column separator when creating a table in Asciidoc, you can do so by specific the separator field in the table preamble.

For example, in the following Asciidoc table I can’t use the default pipe character | to separate the table columns, because I need to use that character in the content inside the table, so I set the separator character to be : instead:

<<methods_to_combine_cmds>> lists the ...

.Methods to combine external commands
:Methods :Description
:`cmd1 #| cmd2`  :The output of the first ...
:`cmd1 ### cmd2` :`cmd1` and `cmd2` will be ...
:`cmd1 #> cmd2`  :Normally used to write to ...
:`cmd1 #&& cmd2` :Run `cmd2` if `cmd1` runs ...
:`cmd1 #|| cmd2` :Run `cmd2` if `cmd1` ...
:`cmd1 #&& cmd2 #|| cmd3` :Run `cmd2` is ...

I shortened that content so you don’t have to read through all the non-essential text, but the image shows the actual resulting Asciidoc table.

For more information, this URL was the most helpful resource for me. This other page shows how you can specify format="csv" to create a table from a CSV-style syntax.

In summary, if you needed to see how to create an Asciidoc table with a non-default table column separator, I hope this example is helpful.

Markdown comments syntax: Comments that won’t appear in generated output

Markdown FAQ: How do I create comments in Markdown? Especially comments that won’t appear in the generated output.

Part 1 of my answer is that technically there is no way — or at least no standard way — to create comments in Markdown documents, other than to use HTML comments like this:

    this is a an html comment.
    the bad part of this is that it will appear in
    any document you generate from this markdown, such as if
    you convert this markdown to HTML with MacDown or Pandoc.

The bad part about using an HTML comment is that most Markdown-to-HTML conversion tools keep those comments in the output you generate. I know that Pandoc and MacDown will both include your comments in the HTML output they generate.

Solution: A trick to create Markdown comments

Part 2 of the answer is that a user on Stack Overflow came up with this way to create Markdown comments that won’t appear in generated output:

[//]: # (This syntax works like a comment, and won't appear in any output.)
[//]: # (It’s a little bizarre, but it works with MacDown and Pandoc.)

As they note on that SO page, this approach uses an “unintended side effect of the use of YAML for metadata, but it works.”

This syntax is ugly and I’ll never remember it, but I guess that’s what macros are for. I’ve read that some people have no idea why someone would want to create comments in Markdown text, and to that I reply, “Try writing a book.”

As a summary, I can confirm that this fake Markdown comment syntax works with both MacDown and Pandoc. When I put comments like this in my Markdown source, they do not end up in my generated HTML or LaTeX output, which is what I want.

I realize that most inventions fail not because ...

“I realize that most inventions fail not because the R&D department can’t get them to work, but because the timing is wrong‍ — not all of the enabling factors are at play where they are needed. Inventing is a lot like surfing: you have to anticipate and catch the wave at just the right moment.”

~ Ray Kurzweil

Performance is important to acquiring and retaining customers.

I used to use all the time. Then, over time, I noticed that it kept getting slower and slower. Out of frustration I looked around for other good weather websites. Today I use

On the web and with apps, performance — or lack of performance — is important to acquiring and retaining customers.

Bill Gates’ greatest mistake

TechCrunch has a nice, full quote from Bill Gates on what he considers his greatest mistake. I include part of the quote in this image because his “winner-take-all” comment is so important.

Things I don’t like about Facebook today (June, 2019)

I was writing with a friend about Facebook, and realized how much I dislike because (a) they don’t let me control my own timeline — not surprisingly, humans don’t like to be controlled by algorithms — and (b) you definitely get the feeling that you’re a piece of meat and they’re trying to sell you. If they were perceived as a kind, benevolent company that didn’t constantly force their version of “what’s important” on people, people might use it more.

Mobile is not a neutral platform

Ben Evans has an interesting article from 2015 titled, Mobile is not a neutral platform. Here’s a good quote:

“Of course, all this sort of stuff is a big reason why Google bought Android in the first place — Google was afraid that Microsoft (it was that long ago) would dominate mobile operating systems and shut it out. The obvious fear was around things like preloads, and the justice of that fear was proven right with Maps, where Apple Maps now has 2-3x more users on iOS than does Google Maps, despite being a weaker product — the ‘good enough’ default wins and the platform owner chooses what that is.”

On Twitter privacy settings and personalized ads

I don’t know if it was just coincidence, but I went to Lowe’s yesterday for the first time in seven months, then I had a Lowe’s ad on Twitter first thing this morning. So “Allow some” is now “Off.” (See the Location and Personalization settings in the images.)

Amazon Kindle eBook cover specifications (height and width size requirements)

I'm in the process of publishing my second eBook for the Amazon Kindle, and one thing that's currently hard to find on the Amazon website is what the eBook cover height and width size specifications are. You can currently only find this information when you get ready to publish your book.

So, as a brief public service, as of May, 2012, here are the Amazon Kindle eBook cover height and width specifications, courtesy of the Amazon KDP book publication website: