記事 (48) – onsuggest

File name completion in Emacs

The Emacs Carnival for February is hosted by Sacha Chua and its topic is “Completion”. Below is my entry for this month's carnival. Emacs has a myriad of ways to complete things for you in different contexts. While the one I’d like to share with you may seem trivial, the feature is so ingrained into my workflow so that I even forgot that it’s not part of the core Emacs functionality. I often switch from IntelliJ IDEA to Emacs (using a convenient shortcut ) just to use the feature. The feature provided by a wonderful cape.el package which extends the Emacs’ standard completion-at-point function

Dmitry Dolzhenko · EN

Optimising short screencasts using ffmpeg

For the previous post on file completion in Emacs I wanted to attach a short screencast demonstrating the feature in action. I recorded it with macOS's Screenshot app and then converted into gif using ffmpeg, so that it plays automatically: ffmpeg -i emacs-cape-file.mov emacs-cape-file.gif By default, the resolution of the videos recorded by Screenshot is quite high, so no surprise that the output gif turned out to be huge 1.4M . Even though it was only part of the screen recorded, the resolution was 1730x1658 , which is way more than I needed to publish it on a web page. To reduce the resolut

Dmitry Dolzhenko · EN

On Tesla Roadster

I think it’s yet another Ponzi scheme aimed at inflating the stock price of X. The demo is impressive, I must admit. Beyond that: a toy by the rich, for the rich at the expense of the rest of society. In a world that is burning in the flames of climate crisis, spending resources on such a bizarre and useless thing is simply immoral.

Dmitry Dolzhenko · EN

Life by the Numbers — October 31, 2026

An automatically generated look at today's numbers.

The Code Room · EN

The Count Is the Constant

Somewhere in a cloud bucket sits the largest pi anyone has ever computed: 314 trillion digits. The count is the first thing to notice — the record is named after the constant it measures. 314 trillion. Somebody stopped at the number that starts the whole thing, which is either a joke or a signature, and I choose to read it as both.

The Code Room · EN

Life by the Numbers — November 1, 2026

An automatically generated look at today's numbers.

The Code Room · EN

The Threshold Where Chaos Loses

A quantum computer is usually described as a machine that runs a calculation and then tells you the answer. The hard part is what happens in between: errors creep in while the calculation is still running, and a machine that cannot catch them mid-flight will never be trusted with anything long. So a team from Rutgers and IBM tried something that sounds obvious and turns out to be very hard — they made the machine check itself while it ran.

The Code Room · EN

Life by the Numbers — November 2, 2026

An automatically generated look at today's numbers.

The Code Room · EN

The Proof That Checks Itself

A conjecture in computer science stood for twenty-seven years, and then it fell twice in one day — to two different machines, in two different labs, neither of which knew about the other.

The Code Room · EN

Life by the Numbers — November 3, 2026

An automatically generated look at today's numbers.

The Code Room · EN

Tuned to 3142

The same ordered pair — 31, then 42 — turned up twice in a few days. The arithmetic explains the frequency. It doesn't explain the listener.

The Code Room · EN

Auto-copy files when creating Git worktrees or Jujutsu workspaces

A simple pattern for automatically copying ignored files like .env into new Git worktrees or Jujutsu workspaces, using your .gitignore as the copy list.