ariel-co’s gists

ariel-co / .vimrc

Created September 11, 2025 01:35

vimrc

	set background=dark
	nnoremap <silent> <C-l> :nohlsearch<CR>
	set autoindent
	filetype plugin indent on

	set expandtab
	set tabstop=4
	set shiftwidth=4
	set softtabstop=4

ariel-co / vscode-separate-history.ps1

Created April 18, 2025 16:14

Powershell / Bash: use a separate history file for VS Code

	# $Profile has the profile location

	# Detect VS Code environment and change the history path
	if ( $env:TERM_PROGRAM -eq "vscode" ) {
	Set-PSReadLineOption -HistorySavePath ((Get-PSReadLineOption).HistorySavePath + "_vscode")
	}

	# Or, to preserve the file extension:
	if ( $env:TERM_PROGRAM -eq "vscode" ) {
	$h = (Get-PSReadLineOption).HistorySavePath

ariel-co / logging_multiple.py

Created April 8, 2025 22:40

logging to both stdout and file

	import logging, logging.config
	logging.config.dictConfig({
	"version": 1,
	"formatters": {
	"common": {
	"format": (f"%(asctime)s%(msecs)03d %(process)7d "
	f"[{JOB_ID or 0:4d}] %(levelname)-7s %(message)s"),
	"datefmt": "%Y-%m-%dT%H:%M:%S" }},
	"handlers": {
	"stdout": {

ariel-co / FormatterWithFallback.py

Last active February 18, 2025 20:28

string formatter without KeyError

	import string
	from typing import Callable

	class FormatterWithFallback(string.Formatter):
	def __init__(self, fallback: str\|Callable):
	self.fallback=fallback

	def get_value(self, key, args, kwds):
	try:
	return super().get_value(key, args, kwds)

ariel-co / is_subarray.py

Created September 9, 2024 19:08

test subarray in Python

	def is_subarray(a, b):
	return any(
	all( e_a==e_b for e_a, e_b in zip(a,b[i:]) )
	for i in range(len(b)-len(a)+1) )

	assert is_subarray('ab', 'abcd')
	assert is_subarray('bc', 'abcd')
	assert is_subarray('cd', 'abcd')
	assert not is_subarray('de', 'abcd')
	assert not is_subarray('abcd', 'ab')

ariel-co / group-nosort.ps1

Last active August 30, 2024 02:22

group-object without sorting first

	function Group-NoSort() {
	[CmdletBinding()]
	Param(
	[Parameter(ValueFromPipeline=$true)] $InputObject,
	[Parameter(Mandatory, Position=0,
	HelpMessage="Name of the property to use as a grouping key")][String] $Property,
	[Parameter(
	HelpMessage="If true, keys will be compared for full equality (e.g. 2.0 and 2 are not equal)")]
	[switch] $StrictEq
	)

ariel-co / encodings.ps1

Created May 12, 2024 01:49

how strings get garbled by wrong encodings

	[System.Text.Encoding]::UTF8.GetBytes("é") \| % ToString X2 \| Join-String -Separator " "
	# C3 A9

	[System.Text.Encoding]::Latin1.GetBytes("é") \| % ToString X2 \| Join-String -Separator " "
	# E9

	[System.Text.Encoding]::Latin1.GetString( [System.Text.Encoding]::UTF8.GetBytes("é") )
	# Ã©

ariel-co / timer-ctxmgr.py

Last active March 30, 2024 23:05

context manager class for timing a code block

	class Timer():
	def __init__(self):
	self.timer = time.perf_counter
	def __enter__(self):
	self.start = self.timer()
	return self
	def __exit__(self, *args):
	self.elapsed = self.timer() - self.start

	if __name__ == "__main__":

ariel-co / argparser_helpmsg.py

Created March 30, 2024 23:01

argparser.ArgumentParser subclass that prints error message automatically

	class MyArgParser(argparse.ArgumentParser):
	def error(self, message):
	print(f'Error: {message}\n', file=sys.stderr)
	self.print_help()
	sys.exit(2)

ariel-co / PbReadStdout.java

Created March 16, 2024 16:21

read process output: three ways

	import java.io.BufferedReader;
	import java.io.InputStreamReader;
	import java.io.StringWriter;

	public class PbReadStdout {
	public static void main(String[] argv) {
	try {
	String[] cmd = {
	// "/bin/sh", "-c",
	// String.format(