Tech

Show commits from another branch not contained in current branch git cherry -v otherbranch + f7d6a569bb6912aac97fce9ac92c4302863fb0d9 thecommit Create empty commit sometimes necessary for build/deploy pipelines …​ git commit --allow-empty -m "Empty-Commit" Cherry pick without commit git cherry-pick -n HASH Using vimdiff for diff set it via git config git config --global diff.tool vimdiff git config --global merge.tool vimdiff set it via ~/.gitconfig [diff] tool = vimdiff [merge] tool = vimdiff Using vscode as diff and mergetool You need to have the shell integration installed (code binary in PATH) ...

Generate AsciiDoc Documentation and Publish it with GitLab Pages We setup a repository and add a directory named docs there .. this is the home of our AsciiDoc files. We’re using asciidoctor/docker-asciidoctor as Docker image for tool provisioning This is the .gitlab-ci.yml, we’re running the stage only when something in the docs directory has changed. stages: - "Build docs" # The name of the job activates the GitLab pages publication pages: image: asciidoctor/docker-asciidoctor stage: "Build docs" tags: - build script: - sh ./gen_docs.sh - mv output public only: refs: - master changes: - /docs/* artifacts: paths: - public expose_as: 'Documentation Archive' ...

Importing XML Data in Google Sheets Use the XMLIMPORT function The syntax is XMLIMPORT("url", "xpath") e.g. for importing an XML sitemap =IMPORTXML("https://www.hascode.com/sitemap.xml", "//\*[local-name()='url']/*[local-name()='loc']") Select the preceding cell in Google Sheets =INDIRECT(ADDRESS(ROW()-1,COLUMN()) Create a Todo List Counter in Google Sheets Each empty cell is a todo, each filled cell is done. That allows us the following output, that counts all preceding cells of each type: ="Done: "&(COUNTA(B3:INDIRECT(ADDRESS(ROW()-1,COLUMN())))&" Todo: " &COUNTIF(B3:INDIRECT(ADDRESS(ROW()-1,COLUMN())),"")) This outputs a label like "Done: 35 Todo: 142" ...

Common operations Add Helm Repository helm repo add NAME URL e.g. for the Bitnami repository: helm repo add bitnami https://charts.bitnami.com/bitnami 1 ↵ "bitnami" has been added to your repositories List Repositories helm repo list 130 ↵ NAME URL bitnami https://charts.bitnami.com/bitnami Searching in a Helm Repository helm search repo wordpress NAME CHART VERSION APP VERSION DESCRIPTION bitnami/wordpress 15.2.30 6.1.1 WordPress is the world's most popular blogging ... bitnami/wordpress-intel 2.1.31 6.1.1 DEPRECATED WordPress for Intel is the most popu... ...

Live Templates JUnit 5 Test @org.junit.jupiter.api.Test @org.junit.jupiter.api.DisplayName("$NAME$") void $METHOD$() throws Exception { $END$ } Figure 1. IntelliJ Live Template Editor Edit Variables: NAME METHOD: default-value camelCase(NAME) Figure 2. Editing template variables SLF4J Logger Template private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger( $CLASS$.class ); Edit variables: CLASS: expression: className() Favorite Shortcuts Select whole block in Editor Cmd+Tab+Down Select similar blocks in editor Ctrl+G Copy the absolute Path of the current File into Clipboard Cmd+Shift+C ...

Remote Debug a Pod’s Java Process Simple steps for remote debugging a Java process running on a k8 pod: Edit deployment and add the following parameters to the Java start line: -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=127.0.0.1:5005 Also add the following port mapping at the section container → ports in the deployment: - containerPort: 5005 protocol: TCP Safe, wait for the new pods and then add a port forward for port 5005 for this pod: kubectl port-forward podname 5005 ...

Creating a Nodejs Module 1) Create a package.json using npm init $ npm init This utility will walk you through creating a package.json file. It only covers the most common items, and tries to guess sane defaults. See npm help json for definitive documentation on these fields and exactly what they do. Use npm install <pkg> --save afterwards to install a package and save it as a dependency in the package.json file. ...

Sample JSON File Sample JSON File containing well known programmers that we use for the following examples coders.json [ { "name": "Bjarne Stroustrup", "languages": [ { "name": "C++", "year_created": 1983 } ], "details": { "nationality": "Danish", "awards": ["IEEE Computer Society Computer Pioneer Award", "Charles Stark Draper Prize"] } }, { "name": "Guido van Rossum", "languages": [ { "name": "Python", "year_created": 1991 } ], "details": { "nationality": "Dutch", "awards": ["Free Software Foundation Award for the Advancement of Free Software", "NLUUG Award"] } }, { "name": "James Gosling", "languages": [ { "name": "Java", "year_created": 1995 } ], "details": { "nationality": "Canadian", "awards": ["Order of Canada", "The Economist Innovation Award"] } }, { "name": "Dennis Ritchie", "languages": [ { "name": "C", "year_created": 1972 }, { "name": "Unix", "year_created": 1969 } ], "details": { "nationality": "American", "awards": ["Turing Award", "National Medal of Technology"] } }, { "name": "Brendan Eich", "languages": [ { "name": "JavaScript", "year_created": 1995 } ], "details": { "nationality": "American", "awards": ["Webby Award"] } } ] ...

Start an Image with kcat / kafka-cat for Debugging kubectl -n NAMESPACE run "$(whoami)-debug" -it --rm \ --image=confluentinc/cp-kafkacat:6.1.9 \ --restart=Never \ -- bash Dockerfile for Kafka Analysis Container with different Tools With jq, kafka console tools, schema registry tools and kafkacat installed …​. Dockerfile FROM confluentinc/cp-kafka:6.2.1 as cp-kafka FROM confluentinc/cp-schema-registry:6.2.1 as cp-schema-registry FROM debian:10-slim ARG DEBIAN_FRONTEND=noninteractive # Install necessary tools RUN apt-get update && apt-get install -y \ curl \ jq \ yq \ && rm -rf /var/lib/apt/lists/* # Install kafkacat binary RUN apt-get update && apt-get install -y kafkacat && rm -rf /var/lib/apt/lists/* # Copy Kafka binaries COPY --from=cp-kafka /usr/bin/kafka-* /usr/bin/ COPY --from=cp-schema-registry /usr/bin/schema-registry* /usr/bin/ # Copy entrypoint script COPY entrypoint.sh /usr/bin/entrypoint.sh RUN chmod +x /usr/bin/entrypoint.sh ENTRYPOINT ["/usr/bin/entrypoint.sh"] ...

Checks / Exit Conditions Instead of writing something like if !condition throw …​ we may use require and check for quick exit conditions: val num = 1; require(num > 1){ // ... } val num = 1; require(num > 1){ // .. } Pluralize Strings Adding pluralization as extension function fun String.pluralize(count:Int):String { return if (count > 1){ this + 's' } else { this } } Use it like this ...