CMCDragonkai

import functools
import dask
import dask.dataframe as dd
import pandas as pd

pdf = pd.DataFrame({
    'x': range(0, 100),
    'y': range(0, 100),
    'z': range(0, 100)
})

CMCDragonkai

GoPro on Linux (NixOS)

The GoPro Hero 7 uses MTP for transferring files. To connect on NixOS you need to have MTP.

The best GUI tool for MTP is gmtp. Connect your GoPro and use gmtp to transfer files.

For more advanced interaction with GoPro devices, see https://github.com/NixOS/nixpkgs/pull/65607

CMCDragonkai

// by scaling the uniform distribution between [0,1) to [min,max)
function randomRangeInt (min, max) {
  return min + Math.floor(Math.random() * (max - min));
}

CMCDragonkai

Ideas in HTTP Restful API

Pagination

Pagination should always be using 2 parameters: seek and limit.

The seek is the offset into the collection.

The limit is how many to items to acquire.

CMCDragonkai

// you often want to check if a value is truthy
function booleanise(v) {
  return !!v;
}

booleanise(0) // false
booleanise('') // false (empty strings is falsey)
booleanise(false) // false
booleanise(null) // false
booleanise(undefined) // false

CMCDragonkai

Journey into Nix Package Repository

There are 2 commits that I need in my build:

• 8d0e3ad603dda85462161bba1351893b84339462
• 83e01aa5e48a9107f3b988c9d4c1c21d610626fb

Clone nixpkgs and add the nixpkgs-channels as a remote.

CMCDragonkai

Nix Overrides

• overrideDerivation is used to override the call to derivation
• overrideAttrs is used to override the call to stdenv.mkDerivation
• override is used to override the last function call. Often this will be the callPackage call.
• overridePythonAttrs is used to override the call to buildPython*.

This PR https://github.com/NixOS/nixpkgs/pull/46842 discusses the idea to have a generic overrideArgs that works like overridePythonAttrs for all language infrastructures.

CMCDragonkai

Understanding Nix Inputs

Every Nix derivation produces a Nix store output that has 3 things:

• Executables
• Libraries
• Data

Executables are always exported using the PATH environment variable. This is pretty much automatic.

CMCDragonkai

import functools

def prepost(func=None, *, prefix=''):
    def prepost_(func):
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            print(f'{prefix} start')
            result = func(*args, **kwargs)
            print(f'{prefix} end')
            return result

CMCDragonkai

#!/usr/bin/env sh

# basically we go into a directory
# we list all immediate files/directories
# then we filter it by a numeric (timestamp) range
# and then we perform a deletion on them

unixtime-gc () {
  find "$1" \
    -maxdepth 1 \