tef

fair, fine grained, and deadlock free locking

first, a spin lock

you know what a spinlock is, right?

here's a spinlock:

tef

to be clear: histogram diff doesn't work like patience diff

By always selecting a LCS position with the lowest occurrence count, this algorithm behaves exactly like Bram Cohen's patience diff whenever there is a unique common element available between the two sequences.

This isn't true. It behaves the same when all unique tokens in the first file happen to be unique tokens in the second file. If the unique tokens in the first file aren't unique in the second file, histogram doesn't work like patience at all:

% cat a
2

tef

"""
a write-ahead-log with undo and redo

undo and redo can be implemented atop list of actions, where
each new action adds onto the list, and undo removes it from
the list, and updates the predecessor with the new redo option, 
and redo does the opposite process

say we have some history:

tef

func MakeFunc(out any) error {

  handle := func(args []any) ([]any, error) {
    // the func we're wrapping
    return args
  }

	outFn := reflect.ValueOf(out).Elem()
	outType := outFn.Type()

tef

from contextlib import contextmanager

class Node:
    def __init__(self, name, args, children):
        self.name = name
        self.args = args
        self.children = children

    def __str__(self):
        out = []

tef

Now published at https://programmingisterrible.com/post/696130032656171008/questions-i-have-been-asked-about-photography

Questions I have been asked about photography.

... and some answers I have given which may or may not help you.

What's the best way to learn photography?

Practice.

tef

Blockquotes are awful in markdown, because they're semi optional in continuation lines.

There are three options i've considered:

---

Option A: Blockquote at start of para, and on every continuation line.

> a

tef

Trip Report: Writing a CommonMark Parser

Resources

• https://spec.commonmark.org/0.29/

  CommonMark Spec 0.29

• https://github.com/tef/toyparser2019/tree/master/toyparser/commonmark

tef

Here is an indented block:

One Space, One Tab
One Tab
 One Tab, One Space.
 Five Spaces

Now prefixed with '> ', Here the's the indented block:

'> ', One Space, One Tab

tef

tab completion

a vex command can have multiple parts: vex name:subname:subsubname --args .., and the subnames are grouped, and have aliases.

grouping means that vex help prints them out in groups.

tab completing with no command shows all root commands, but not aliases:

sycamore:demo tef$ vex