Development Apps/Tools/Tips and Tricks

Apps

QuickDraw

Found quickdraw which is an app for drawing over the screen. Unfortunately, it doesn’t seem to provide any packages, and I’m unable to build it locally. A similar application which is quite good is Pensela.

Command Line Tools

  • ImageMagick Resize a bunch of images using ImageMagick
find ./static -name '*.png' | while read line; do convert -resize 1280x1280 $line $line; done
  • Combine and convert list of images into a single PDF
convert IMG_00{09..18}.JPG IMG_0025.JPG IMG_00{19..20}.JPG IMG_0026.JPG IMG_00{21..24}.JPG Final-Doc.pdf
  • jq: Length of array
$ echo '["123", "567", "abc"]' | jq '. | length'
  • Shell: Pass contents of clipboard as file descriptor. It’ll work with apps expecting file argument.
$ command <(pbpaste)
  • Convert: Resize image
$ convert -quality 75% -resize 40x40 twitter.png twitter-icn.png
  • Ctrl X-E to quickly edit current command

Refactor request API

Homebrew

Updating packages_

brew update

Cleaning up brew

brew bundle dump # Writes all installed casks/formulae/taps to Brewfile
brew bundle --force cleanup # Removes all dependencies not listed in Brewfile

Hugo

Build with drafts

hugo -D serve

Sqlite

Sqlite

Sql.js

sql.js-httpvfs

Here are few links for future reference

https://phiresky.github.io/blog/2021/hosting-sqlite-databases-on-github-pages/

https://github.com/segfall/static-wiki

https://github.com/ilmalte/github-actions-with-sqlite

https://github.com/phiresky/sql.js-httpvfs/issues/22

PostgreSQL

Database Notes

Jenkins

https://github.com/hoto/jenkinsfile-examples

Executable examples of Jenkinsfiles.

https://github.com/oleg-nenashev/demo-jenkins-config-as-code

Demo of Jenkins Configuration-As-Code with Docker and Groovy Hook Scripts

https://gitlab.com/stavros/harbormaster

Harbormaster is a small utility that lets you easily deploy multiple Docker-Compose applications on a single host.

https://dockerswarm.rocks/

Security

Docker

alias aws='docker run --rm -v ~/.aws:/.aws -v "$(pwd)":"$(pwd)" -w "$(pwd)" -u 1000:1000 -e AWS_PROFILE mikesir87/aws-cli:1.18.11 aws'
alias jq='docker run -i --rm jess/jq jq'

Hugo

hugo = docker run --rm -u $$(id -u):$$(id -g) -v "$$(pwd)":/src -v "$$(pwd)"/output:/target $(2) klakegg/hugo:0.54.0-ext-alpine $(1)

hugo-watch:
    mkdir -p output
    $(call hugo, server, -it -p 1313:1313)

Python

run_container = docker run -i --rm -u $$(id -u):$$(id -g) -v "$$(pwd)":"$$(pwd)" -w "$$(pwd)" $(3) $(1) $(2)
python = $(call run_container, python:3.8.2-alpine3.11, $(1), -e PYTHONUSERBASE="$$(pwd)"/vendor $(2))

dependencies:
    $(call python, pip install --user -r requirements.txt, -e XDG_CACHE_HOME=$(user_cache_dir) -v "$(user_cache_dir)":"$(user_cache_dir)")

repl:
    $(call python, python)

run:
    $(call python, python -m app.main)

# where user_cache_dir is set elsewhere to ~/.cache on Linux or ~/Library/Caches on a Mac.

AWS

GoLang

Java

Java Notes

private String reservedCharacter = "!#$%&'()*+,/:;=?@[]";
private char[] chars = reservedCharacter.toCharArray();
  • Java/JUnit5 : Parameterized testing with JUnit 5
@ParameterizedTest(name = "{0} should be \"{1}\"")
    @CsvSource({
            "http://www.example.com, http%3A%2F%2Fwww.example.com",
            "?query=123, %3Fquery%3D123"
    })
    public void testPercentEncodeAsciiString(String source, String expected) {
        // when
        String result = PercentEncoding.encode(source);

        // then
        assertEquals(expected, result);
    }
  • Java: Generating a mvn wrapper
$ mvn -N io.takari:maven:0.7.7:wrapper

Python

class A:
	pass

a = A()
print(a.__class__.__name__)

# or
print(type(a).__name__)
  • Python: List sub directories
tool_codegen_dir: Path = Path(__file__)
print([x.name for x in tool_codegen_dir.iterdir() if x.is_dir()])
  • Python/PyQt: One way to handle focusOut event by installing event filter on the widget
# Installing event filter
self.parent.txt_scratch_pad.installEventFilter(self.events)

# where self.events in a class with a QObject parent class - like ScratchPadEvents 👇

# Then override eventFilter method in that class
class ScratchPadEvents(QObject):
    def __init__(self, parent, app):
        super().__init__(parent)

    def eventFilter(self, source: QObject, event: QEvent):
        if event.type() == QtCore.QEvent.FocusOut:
            # do something
            pass

        return super().eventFilter(source, event)
  • Python/PyQt5: TextEdit Widget Scroll to top
def scroll_to_top(txt_edit_widget):
    txt_cursor: QTextCursor = txt_edit_widget.textCursor()
    txt_cursor.movePosition(QTextCursor.Start)
    txt_edit_widget.setTextCursor(txt_cursor)
  • Python/PyQt5: Replacing Text in a PlainTextEdit without losing undo/redo history
def replace_text(self, txt_edit_widget, new_text):
    txt_cursor: QTextCursor = txt_edit_widget.textCursor()
    txt_cursor.select(QTextCursor.Document)
    txt_cursor.insertText(new_text)
  • Python/JsonPath: Filtering JSON using JsonPath.
pip install jsonpath-ng

from jsonpath_ng.ext import parse as jsonpath_parse

def filter_json_path(self, json_doc, path_query):
    if not json_doc:
        return

    parsed_query = jsonpath_parse(path_query)
    key_found = parsed_query.find(json_doc)
    if key_found:
        return key_found[0].value
    else:
        return None
  • Python : Python one liner to extract and transform Spring HttpStatus enums Raw
curl -s https://raw.githubusercontent.com/spring-projects/spring-framework/master/spring-web/src/main/java/org/springframework/http/HttpStatus.java | \
grep '\".*),' | \
while read line; \
  do echo $line | python -c 'import re,sys; s, c, m = re.search("([\w\_]+)\((\d+),\s+\"([\w\s]+)", sys.stdin.readline()).groups(); print("{}: (\"HttpStatus.{}\", \"{}\"),".format(c, s, m))'; \
done
  • Python: Find words in a sentence
source = 'The quick brown fox jumps over the lazy dog'

import re
print(re.findall(r'\b(\w+)\b', source))
  • Python/Jinja: Using Jinja template in a simple Python script
$ cat template.j2
{{ description }}
# pip install Jinja2

from jinja2 import Environment, FileSystemLoader

TEMPLATE_DIR = os.path.dirname(os.path.abspath(__file__))

jinja_env = Environment(loader=FileSystemLoader(TEMPLATE_DIR), trim_blocks=True)

book_item = dict(
	description="Hello World"
)

rendered = jinja_env.get_template("template.j2").render(book_item)
print(rendered)
  • Python: A Quick script to collect data from website
from pathlib import Path
import re
import subprocess
import time

def run_command(command):
  return subprocess.check_output(command, stderr=subprocess.STDOUT, shell=True).decode('utf-8')
  
link_rgx = re.compile("Link\s=\s\"(.*)\"")

def process_file(file):
  text = file.read_text()
  link = link_rgx.findall(text)[0]
  cmd = "curl -s " + link + ' | pup \'div.stacked div.left a.actionLinkLite text{}\' | head -n 1'
  category = run_command(cmd)
  category = category.strip()
  print("Running {}".format(cmd))
  print("Category Found for {} is {}".format(link, category))
  cmd = 'sed -i.bak \'s/categories = \[""\]/categories = \["' + category + '"\]/g\' ' + file.as_posix()
  print("Running {}".format(cmd))
  run_command(cmd)
  time.sleep(5)

def main():
  p = Path.cwd().joinpath("books")
  for f in p.iterdir():
    process_file(f)

if __name__=="__main__":
  main()
  • Python/PyQt: Open file dialog box
from PyQt5.QtWidgets import QFileDialog

def open_file(self, dialog_title, dialog_location, file_filter=None):
    return QFileDialog.getOpenFileName(
        self, dialog_title, dialog_location, filter=file_filter
)

file_location, _ = self.main_window.save_file(
    "Export Environments",
    current_project_folder,
    file_filter="Environment Files (*.envs.json)",
)

if file_location:
	# do something
	pass

Flask

https://github.com/damian-ontivero/servertree

Made with Python (Flask), HTML, CSS3, JavaScript (A little) and SQLAlchemy as ORM.

PyQt

https://github.com/kadir014/pyqt5-custom-widgets

More useful widgets for PyQt5

https://github.com/taseikyo/PyQt5-Apps

Some useful apps based on PyQt5.

https://www.pythonguis.com/tutorials/system-tray-mac-menu-bar-applications-pyqt/

System tray & Mac menu bar applications

Graphics / Diagrams

https://github.com/p5py/p5

p5 is a Python package based on the core ideas of Processing.

Machine Learning

Gaming

https://github.com/CharlesPikachu/Games

Games: Create interesting games by pure python.

https://github.com/tasdikrahman/spaceShooter

🎮 The classic retro game recreated using Pygame and python

https://github.com/jatinmandav/Gaming-in-Python

Code to all the Games made using Python Programming Language

Testing Tools

webium

Webium is a Page Object pattern implementation library for Python (http://martinfowler.com/bliki/PageObject.html). It allows you to extend WebElement class to your custom controls like Link, Button and group them as pages.