Mar 24, 2022
Alexander meets Illich
https://escapingflatland.substack.com/p/christopher-alexanders-architecture
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Mar 18, 2022
"The more living patterns there are in a place -- a room, a building, or a town -- the more it comes to life as an entirety, the more it glows, the more it has that self-maintaining fire which is the quality without a name.
"And when a building has this fire, then it becomes a part of nature. Like ocean waves, or blades of grass, its parts are governed by the endless play of repetition and variety created in the presence of the fact that all things pass. This is the quality itself."
RIP CA
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Mar 17, 2022
Has anybody played with this folk algorithm to generate prime numbers using the Sieve of Eratosthenes, creating a coroutine for each prime? Examples:
using fork() and pipe(): https://www.cs.dartmouth.edu/~doug/sieve/sieve.pdf
in C using tasks and channels: https://swtch.com/libtask
in Lua using tasks and channels: https://github.com/majek/lua-channels/blob/master/examples/sieve.lua
in Python using a more efficient but less interesting algo because Python lacks full coroutines: https://github.com/majek/lua-channels/blob/master/examples/sieve.lua
It might be fun to try this in Wireworld.
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Mar 13, 2022
Beginnings of a way to link to arbitrary lines in a text file.
One thing Zettelkasten and Roam provide that my system of text files doesn't is the ability to hyperlink to an arbitrary line in any file in the corpus. I don't think Org-mode has that either.
Line numbers break if I go back and edit above them. I could maintain a table of line hashes somewhere, but that'll get thrown off by small changes to the line, or even reformatting a paragraph.
Idea: just pick the first letter of each word.
Here's how you turn a line of text into an id:
$ echo ' The quick brown fox jumped over' | sed 's/^\s*//' | sed 's/\([^ ]\)[^ ]* */\1/g'
Tqbfjo
And here's how you search for the file containing a given id:
$ grep "$(echo Tqbfjo |sed 's/./\\<&.*/g')" . -rl
If the line gets reformatted and the line gets split between two others, just search for prefixes or suffixes of the id.
As a fork of Lua, Teliva has always had a copy of the Lua manual. I finally brought it up to date.
https://akkartik.github.io/teliva/doc/manual.html
Sections for capabilities Teliva takes away (mostly the C API which compromises sandboxing) are deleted. New sections are highlighted in magenta.
The table of contents should give a sense of the new parts.
In particular I'm kinda proud of Teliva's new File I/O primitives
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Mar 7, 2022
Heck, Teliva has a big issue 😞
Apps ship with source. To let you run without reading the source, apps run without any privileges by default. No files, no network.
You can grant broad privileges to a single function after reading just its source.
The issue: functions can be over-ridden, so you end up accidentally granting privileges to malicious nooks and crannies.
I need to go back to app-level permissions. Grant narrow privileges to the whole app, without regard to what function uses them.
A concrete use case for permissions by caller (now removed from Teliva)
By its nature, a file browser can list directory contents and open files all over the computer. How could we convince ourselves that it's only using these privileges to meet our requests?
My old solution: app is written in such a way that someone can grant these privileges to a single function after convincing themselves it opens a single file/directory every time the Enter key is pressed.
Now I need something new..
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Mar 1, 2022
AoC 2021, day 8
"Part 2 is tricky. The first output value 'cdfgba' could be either a 0, 6, or 9. To figure out which one it is I could do some fancy constraint satisfaction. That sounds hard. Or I could exhaustively try all permutations of the 7 letters. That sounds easy! Here's my plan.."
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Feb 27, 2022
A dilemma in building terminal apps
Most apps use width poorly, with lots of empty space towards the right.
Long lines of text are also less readable.
So more apps should be using some sort of column layout when the window is wide.
However, narrow columns magnify a different problem: urls can't be clicked on if they span multiple lines.
One possible solution: an escape sequence to hyperlink to urls in shorter text. https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda lists terminals supporting it. Does your terminal?
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Feb 21, 2022
Fun with the kids
git clone https://github.com/akkartik/teliva cd teliva make src/teliva anagrams.tlv
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Feb 19, 2022
I rewrote a section of Teliva's Readme today:
https://github.com/akkartik/teliva#who-are-we-trusting-by-trusting-you
Small change in text: https://github.com/akkartik/teliva/commit/b36927e35cd26
But a big step in a huge trajectory of maturing thinking.
2010: Dependencies are moving parts, introduce unreliability.
2015: Well, we have to depend on something. Ok, hardware only.
2021: Firmware, management engines, shit, I'll come again. Depend on a narrow waist. Posix, C, Lua.
2022: There's even more I can't do alone. Sqlite, Redis, etc. Reputation is a useful signal.
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Feb 12, 2022
It just occurred to me that I can smush the dependencies of two packages together to visualize them at the same time. Here's libcairo2-dev and libsdl2-dev at once.
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