Python - To read file content & write into a file

from pathlib import Path


# Read file content
def read_file():
    test_file = "example/you_test_file.txt"

    contents = Path(test_file).read_text()

    print (contents) # print file content

    #debug(contents) # use can also use my custom debug method to see log in file



# To write message to file for debugging
def debug(message="", type="w+"):
	filePath = "test/debug.txt" # don't forgot to create a empty file

    with open(filePath, type) as f:
        f.write(str(message) + "\n\n")
    f.close()
    

Simple bash stements to set values covering following two scenarios: 1. Set username/password variable if value passed on running the file 2. Or (step 1 doesn't pass values), set them on prompt arguments Create a login.sh file using the below content:

#!/bin/sh

# set -o errexit -o nounset -o xtrace

echo "Initialising Username/Password: "

if test "${1+x}"; then # Set values from inline statement
  username=$1
  password=$2  
else # Otherwise, set values from arguments
  read -p 'Username: ' username
  read -sp 'Password: ' password
fi

echo 'Username: ' $username '| Password: ' $password

1. First scenario, passing the values whilst running the file

$ sh login.sh nepal.user Pokhara123
Username:  nepal.user | Password:  Pokhara123

2. Second scenario, passing the values on prompt arguments

$ sh login.sh 

$ sh login.sh
Initialising Username/Password:
Username: nepal.user
Password: Pokhara123
Username:  nepal.user | Password:  Pokhara123

Build Dynamic Marshal_With in Flask (Python) based on conditions

To create a dynamic marshalling based on condition or parameter type, please follow the instruction below:

# Constants
MARSHELL_WITH_SCHEMAS = {
    "condition_1": Condition1Schema,
    "condition_2": Condition2Schema,
}


# To build dynamic marshalling based on report type
def selective_marshal_with():
    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            condition_type = kwargs.get("condition_type", None)

            # Get marshalled with dynamic schema by condition type
            marshal_with_func = marshal_with(MARSHELL_WITH_SCHEMAS.get(condition_type, None))(func)

            return marshal_with_func(*args, **kwargs)

        return wrapper

    return decorator

# Actual class to connect view to URL
class MyViewClass(MethodResource, Resource):
    @doc(description="My View API", tags=["My View List"])
    @use_kwargs(MyQueryParams, location="query")
    @selective_marshal_with()
    @standard_api("My View List")
    def get(self, **kwargs):
        # you get code here....
    

The MyQueryParams can/should be in seperate schema file for e.g. rest/db/schema/my_view_schema.py

class MyQueryParams(Schema):
    """Query parameters for View List API."""

    condition_type = fields.Str(attribute="condition_type", required=True)

Hope it helps!

Count number of PDF file pages in PHP

Below function returns the number of pages count in PHP

function getPageCount(StreamInterface $stream): int
{
        $result = 0;

        $stream->rewind();

        while (! $stream->eof()) {
            $chunk = $stream->read(4096);

            //  looking for root node PDF 1.7+
            $found = \preg_match('/\/Type\s*?\/Pages(?:(?!\/Parent).)*\/Count\s?(?\d+)/', $chunk, $matches);

            if (0 < $found) {
                return (int) $matches['value'];
            }

            //  looking for root node PDF < 1.7
            $found = \preg_match('/\/Count\s?(?\d+)\s?\/Type\s*?\/Pages/', $chunk, $matches);

            if (0 < $found) {
                return (int) $matches['value'];
            }
            
            //  looking for root node PDF 1.7
            // Both regex1 & regex2 should work, but $regex2 is preferred.
            $regex1 = '/(?<=\/Type\s\/Pages\s(.*)\/Count\s)\d*/gs';
            $regex2 = '/\/Type\s*?\/Pages\s.*\/Count\s?(?\d+)/s';
            $found = \preg_match($regex2, $chunk, $matches);
            
            if (0 < $found) {
                return (int) $matches['value'];
            }

            //  looking for /Type/Page
            $found = \preg_match_all('/\/Type\s*?\/Page\s+/', $chunk, $matches);

            if (0 < $found) {
                $result += $found;
            }
        }

        $stream->rewind();

        return $result;
}

PHP Regex function to extract text between tags for a synopsis or intro text

The following method prepare the synopsis from the body and the second part is for unit tests:

Hope it helps!

Fix for ng serve --watch is not watching for code changes in Ubuntu

I was running the Angular 8 application on Ubuntu LTS 18.04 on my machine and was having an issue to refresh on code update using  --watch.

Trying to use ng serve and ng build --watch was not watching for code changes and I thought it was something to do with node or angular-cli.

However, I found the solution on Github (https://github.com/angular/angular-cli/issues/8313)

I ran the following on Terminal and apparently, it worked and watching code changes:

echo fs.inotify.max_user_watches=524288 | sudo tee /etc/sysctl.d/40-max-user-watches.conf && sudo sysctl --system

Hope this helps!

Angular 7 & Jest & Babel Integration over Jasmine/Karma - AngularSnapshotSerializer.js in the snapshotSerializers option was not found

Steps to integrate of Jest & Babel with Angular 7+:

1. Run the following commands to install:

    # Remove Jesmin/Karma
    npm remove karma karma-chrome-launcher karma-coverage-istanbul-reporter karma-jasmine karma-jasmine-html-reporter
    
    npm uninstall jasmine @types/jasmine
    
    rm ./karma.conf.js ./src/test.ts

    # Install jest    
    npm install --save jest@24.9 @angular-builders/jest@7 @types/jest@24 jest-preset-angular@8 

    # Install babel
    npm install --save-dev babel-jest babel-polyfill
    npm install --save @babel/core @babel/preset-env @babel/preset-flow @babel/preset-typescript    
 

2. On `package.json`, added the following code:

    "scripts": {
      ...
      ...
      "test": "ng test",
      "test:watch": "jest --watch",
      ...
      ...
    }
    ...
    ...   
    "jest": {
      "preset": "jest-preset-angular",
      "setupFilesAfterEnv": [
        "/setupJest.ts"
      ]
    }
 

3. Also, updated the following on the `angular.json`:

    ...
    ... 
    "test": {
       "builder": "@angular-devkit/build-angular:karma",
    ...
    ...
 

Replace with:

    ...
    ... 
    "test": {
       "builder": "@angular-builders/jest:run",
    ...
    ...
 

4. Create the `/setupJest.ts` with below content:

    import 'jest-preset-angular';   
 

5. Create the `/babel.config.js` with below content:

    module.exports = function(api) {

        const presets = [
            '@babel/preset-typescript',
             [
                "@babel/preset-env", {
                    "targets": {
                        "node": "current"
                    }
                }
            ],
            '@babel/preset-flow'
        ];

        return {
            presets,
        };
    };
 

6. And, finally tried running the `ng-test` from a terminal, however, I was stuck with the following error (see picture below):

7. Eventually, managed to fix the issue by adding the file `/src/jest.config.js` with below content:

    module.exports = {
        "transform": {
            "^.+\\.(ts|js|html)$": "ts-jest",
            "^.+\\.[t|j]sx?$": "babel-jest"
        },
        moduleFileExtensions: ['ts', 'html', 'js', 'json'],
        moduleNameMapper: {
            '^src/(.*)$': '/src/$1',
            '^app/(.*)$': '/src/app/$1',
            '^assets/(.*)$': '/src/assets/$1',
            '^environments/(.*)$': '/src/environments/$1',
        },
        transformIgnorePatterns: ['node_modules/(?!@ngrx)'],
        snapshotSerializers: [
            'jest-preset-angular/build/AngularSnapshotSerializer.js',
            'jest-preset-angular/build/HTMLCommentSerializer.js',
        ],
    };

Thereafter, ran `ng test` again and can see the test running thru. I hope it helps!