Windows 10 Build 1909 search bar returns nothing but just a black page

The search bar just failed (no result but just a black screen) after Windows 10 Build 1909 update.

Sigh... Windows is still windows.

To solve it, disable the Bing search in Windows:

1. regedit
2. Go to "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Search"
3. Add DWORD "BingSearchEnabled", value = 0
4. Add DWORD "CortanaConsent", value = 0
5. Restart

Reference: https://www.howtogeek.com/224159/how-to-disable-bing-in-the-windows-10-start-menu/

Dunning Kruger Effect

What is Dunning Kruger Effect?

To my knowledge, DKE means you are overconfident when you just know nothing about a particular area, and you think it would be very easy and joyful to work on it. But of course, the truth is that when you drilled deeper to the area, you will it's not easy to accomplish the stuff, and you lose your confidence.

The situation will be improve when you got more and more knowledge, you'll get back your confidence eventually.


So how to cope with Dunning Kruger Effect? Keep learning ;P

Cross platform application framework

Summary of cross platform framework:

1. Qt - UI is too old and outdated; complicated build process for mobile
2. React Native - Not pixel-perfect as it just maps to native UI;
3. Kotlin Native - Ecosystem is very poor but the good thing is you can use the native libraries in each platform and create wrappers to unify them; also the framework itself hasn't yet reached production stage; you have to write the UI separately for each platform
4. Flutter - Very poor ecosystem/libraries;
5. Xamarin Forms - Like react native as it maps to native UI; slow startup;
6. Xamarin Native - Like kotlin native as you have to write separate UI codes for each platform; but uses arguably the best programming language in C#; and backed by Microsoft which is even more reliable than Google; also supports the most number of platforms including UWP, WPF, MacOS, etc. on top of iOS and Android; you have the support of the entire .NET ecosystem
7. Nativescript - Performance is terrible (build time, startup time, Angular performance, etc.)

Reference:

https://amp.reddit.com/r/Kotlin/comments/bo1ur4/kotlin_vs_qt_for_mobile_apps/

Keep the color prompt in tmux

To keep your prompt (PS1) with color shown in tmux screen, add the following property in .bashrc:

force_color_prompt=yes

Create docker container with the simple flask application

I will try to create a docker container with the simple flask application created some times ago.

---

First, I create a shell script for starting the flask application, namely "boot.sh":

boot.sh

#!/bin/sh
export FLASK_APP=simple.py
flask run --host 0.0.0.0

---

Second, we need to create a requirements.txt file:

requirements.txt

flask==1.1.1

Actually you can run the following to get the requirements.txt:

pip freeze > requirements.txt

---

Third, together with the simple.py file created in the simple flask application, put those 3 files in an "app" directory:

app/

   - boot.sh

   - requirements.txt

   - simple.py

---

Forth, create a Docker file outside the app directory:

Dockerfile

FROM python:3.6-alpine
WORKDIR /home/app
COPY app/ ./
RUN chmod +x ./boot.sh
RUN pip install -r requirements.txt
EXPOSE 5000
ENTRYPOINT ["./boot.sh"]

Build the docker image using the Dockerfile:

     docker build -t simple:latest .

Run the docker container with the docker image we just created:

     docker run -d -p 5000:5000 simple:latest

Check "http://localhost:5000" to check the Flask application.

Simple Flask sample

Just wanna to create a very simple Flask application in a single python source file:

simple.py

from flask import Flask

application = Flask("simple")

@application.route("/")

def index():

return "Hello World"

To run this Flask application, run the following:

• export FLASK_APP=simple.py
• flask run

If you want to put this application in a Docker container, you need to bind to 0.0.0.0:

• flask run --host 0.0.0.0

Now, navigate "http://localhost:5000" to see the word "Hello World" displayed on the browser.

Navigate tmux splitted pane using mouse

To enable navigation on tmux splitted pane using mouse

In tmux environment, do the following:

1. Ctrl-b
2. Type :setw -g mouse on

Done, try to switch your tmux pane with mouse.

Note:
To make this setting persistent, save this line in .tmux.conf:
setw -g mouse on

Assign locale for moment.js

To assign locale in moment.js, we can use the following:

     moment.locale("en")

It will returns "en". However, if you assign an unaccepted locale to it, it won't update its value. For example:

     moment.locale("zh")

It still returns "en", since "zh" is not an accepted locale for moment.js.

Up till now, moment.js accepts:

     zh-hk
     zh-tw
     zh-cn

Reference: momentjs

QGIS freezes while editing features

There are many possibilities for QGIS to hang / freezes while editing features. But for my experience, I found it often hangs when using a Shapefile layer.

To minimize this kind of problem, I tried to use other feature format (e.g. SpatialLite). And the problem is relieved to some extent.

Have a try and let me know if it helps or not.

Windows equivalent of "wc -l" command in Linux

To count the number lines of files / stdout in Linux, we uses "wc -l" to achieve. In Windows, we use the following instead:

• find /c /v ""

For example, suppose we have a file "sample_file.txt" and we want to know the number of lines of that file, we can perform the following:

• type sample_file.txt | find /c /v ""