OndraZizka

class StackBasedContext(
    val nestingStack: Deque<NestingLevel> = ArrayDeque(),
    val problems: MutableList<Pair<String, List<NestingLevel>>> = mutableListOf(),
) {
    override fun toString() = nestingStack.ifEmpty { listOf("(root)") }.joinToString("/")

    fun addProblem(msg: String) { problems.add(msg to nestingStack.descendingIterator().asSequence().toList()) }

    fun pushLevel(dataParam: KParameter): PopOnClose { nestingStack.push(NestingLevel(dataParam)); return PopOnClose() }
    fun pushLevel(collectionIndex: Int): PopOnClose { nestingStack.push(NestingLevel(collectionIndex = collectionIndex)); return PopOnClose() }

OndraZizka

import java.io.FileNotFoundException
import java.io.InputStream
import java.nio.file.Path

object ResourceUtils {

    fun getCallingClassName(): String? {
        var testUtilsSpotted = false;
        for (stackItem in Thread.currentThread().stackTrace) {
            if (stackItem.className == ResourceUtils::class.java.name) {

OndraZizka

Anatomy of Spring Boot Start Up Timing

When a Spring Boot app starts up with default (INFO) logging, there are some noticeable gaps (pauses). It's worth focusing on the gaps when looking for efficiency savings because of the amount of time they take, and because no-one bothered to log anything, so the chances are the app is doing something repetitive. We can tweak the logging levels to try and fill in the gaps and find out what is going on in there.

Basic empty web app with actuators has three such gaps:

0                                                                        1410ms
|------|---------------------------|-----|------|---------|--------|--------|
       |           578             |     |144(5)|         | 133(6) |

OndraZizka

#!/bin/bash

## Run this in a directory to fetch all Git repos within it.

find -name .git | sed 's#.git##' | sort | xargs -t -n1 -I %  git -C % fetch --all

## CRON job: You can also put this into `crontab -e` in order to keep all repos up-to-date automatically:
# # m h  DoM mth DoW   command
# */5 *  *   *   *     find /home/ondra/work -name .git | sed 's#.git##' | sort | xargs -t -n1 -I %  git -C % fetch --all --tags --force

OndraZizka

    private inline fun <reified T : OptionEnum> tryParseEnumOption(enumArgumentDefault: T, arg: String): T? {
        val optionIntro = "--${enumArgumentDefault.optionName}"

        if (!arg.startsWith(optionIntro))
            return null

        if (arg == optionIntro || arg == optionIntro + "=" + enumArgumentDefault.optionValue)
            return enumArgumentDefault

        val valueStr = arg.substringAfter(optionIntro).removePrefix("=")

OndraZizka

/*
  Lazy evaluation of the messages sent to Slf4j.
  Usage:  
    log.trace { "State dump: " + expensiveLongSerialisation(state) }
    See also https://jira.qos.ch/browse/SLF4J-371
*/

import org.slf4j.Logger
import org.slf4j.LoggerFactory
import kotlin.reflect.KClass

OndraZizka

#!/bin/bash
## Because Ubuntu 22.10 still has Maven 3.6.3, this fixes it:

wget -q https://dlcdn.apache.org/maven/maven-3/3.8.6/binaries/apache-maven-3.8.6-bin.tar.gz -P /tmp
mkdir ~/sw/ 
tar xf /tmp/apache-maven-*.tar.gz -C ~/sw/
rm /tmp/apache-maven-*.tar.gz
mv /sw/apache-maven-* -C ~/sw/maven

echo 'MAVEN_HOME=~/sw/maven' >> ~/.bashrc

OndraZizka

FROM ubuntu:22.04

ENV qqy="-qq -y -o=Dpkg::Use-Pty=0"

RUN export DEBIAN_FRONTEND=noninteractive \
    && apt-get $qqy update > /dev/null \
    && apt-get $qqy install ca-certificates curl wget gnupg lsb-release > /dev/null \
    && mkdir -p /etc/apt/keyrings \
    && curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg \

OndraZizka

##
## This is not a script, rather a sequence of commands to do.
## I have tested it and it works.
## Use at your own responsibility.
## Compiled from https://www.dionysopoulos.me/apple-display-brightness-controls-in-ubuntu-desktop.html
## See https://github.com/yhaenggi/acdcontrol.git for more info.
##

sudo apt-install g++ make
git clone https://github.com/yhaenggi/acdcontrol.git

OndraZizka

/** 
 * Extracts the first text string in double quotes in the formula of the cell at given address.
 * @param {"A1"}  address Cell address as a string.
 * @customfunction
 */
function getCellLink(address) {

  if(!(address && typeof(address) == 'string'))
    throw new Error('The 1st param must be a cell address as a string.');