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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Scripting’ Category

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Nick Hodges on SOLID in TypeScript using Angular

Posted by jpluimers on 2020/08/18

For my link archive: after a long history of Delphi programming, Nick Hodges did a

SOLID series with TypeScript using Angular

They explain these SOLID – Wikipedia concepts:

  1. Single responsibility principle – Wikipedia
  2. Open–closed principle – Wikipedia
  3. Liskov substitution principle – Wikipedia
  4. Interface segregation principle – Wikipedia
  5. Dependency inversion principle – Wikipedia

After that, he did a series on:

[WayBack] Angular 101 – Angles and Types

More Angular and TypeScript

Since Nick likes that combination so much:

and his TypeScript series start:

and what started as a trilogy in 5 parts of his [WayBack] Angular 101 – Angles and Types became much longer:

Related:

DIID update

Nick also updated the public repository with the changes that did make it in his Dependency injection in Delphi book earlier:

–jeroen

Read the rest of this entry »

Posted in Design Patterns, Development, Scripting, Software Development, TypeScript | Leave a Comment »

PowerShell: checking minimum version

Posted by jpluimers on 2020/08/13

Nowadays, often your PowerShell code uses features unavailable in older PowerShell versions. When running it on a version that is too old, you usually get an error message, for instance like this:

Unable to find type [Ordered]: make sure that the assembly containing this type is loaded.

Back in the days, this was a new feature introduced in PowerShell 3.0: [WayBack] Use cases of [ordered], the new PowerShell 3.0 feature – Stack Overflow

It is way friendlier to show a message indicating the version is too old in stead of throwing this error.

That’s where the # Requires Version 3.0 directive comes in: [WayBack] about_Requires | Microsoft Docs.

Adding this line to the top of a script gives output like this on a stock Windows 7 SP1 system that has PowerShell 2.0:

# PowerShell -f List-Delphi-Installed-Packages.ps1
The script ‘List-Delphi-Installed-Packages.ps1’ cannot be run because it contained a “#requires” statement at line 1 for Windows PowerShell version 3.0. The version required by the script does not match the currently running version of Windows PowerShell version 2.0.
+ CategoryInfo : ResourceUnavailable: (List-Delphi-Installed-Packages.ps1:String) [], ParentContainsErrorRecordException
+ FullyQualifiedErrorId : ScriptRequiresUnmatchedPSVersion

Note that PowerShell 3.0 is also the minimum version for debugging it in Visual Studio Code (which means you do not have to use PowerShell ISE any more; it is still there , but so far behind as a development tool that many prefer Visual Studio Code):

–jeroen

Posted in CommandLine, Development, PowerShell, PowerShell, Scripting, Software Development | Leave a Comment »

PowerShell: finding WSD printer details enumerating through HKLM\SYSTEM\CurrentControlSet\Enum\SWD\DAFWSDProvider

Posted by jpluimers on 2020/08/13

WSD seems the way Microsoft Windows 8+ does printing, which makes it a lot harder to find the IP address of a printer, for instance to configure a Mac to print to it.

The key seems to be enumerating over HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\SWD\DAFWSDProvider.

Some links that should help me doing this:

–jeroen

Posted in Development, PowerShell, Scripting, Software Development | Leave a Comment »

Installing and updating Windows PowerShell – via Microsoft Docs

Posted by jpluimers on 2020/08/11

Since I keep forgetting that PowerShell is part of WMF (Windows Management Framework) and about the compatibility/installation matrix: [WayBack] Installing Windows PowerShell | Microsoft Docs:

The installation package for PowerShell comes inside a WMF installer. The version of the WMF installer matches the version of PowerShell; there’s no stand alone installer for Windows PowerShell.

If you need to update your existing version of PowerShell, in Windows, use the following table to locate the installer for the version of PowerShell you want to update to.

Windows PS 3.0 PS 4.0 PS 5.0 PS 5.1
Windows 10 (see Note1)
Windows Server 2016		 – – – installed
Windows 8.1
Windows Server 2012 R2		 – installed [WayBack] WMF 5.0 [WayBack] WMF 5.1
Windows 8
Windows Server 2012		 installed [WayBack] WMF 4.0  [WayBack] WMF 5.0 [WayBack] WMF 5.1
Windows 7 SP1
Windows Server 2008 R2 SP1		 [WayBack] WMF 3.0 [WayBack] WMF 4.0 [WayBack] WMF 5.0 [WayBack] WMF 5.1

For historic reference:

Downloads

[WayBack] Windows Management Framework 5.1

[WayBack] Windows Management Framework 5.0

To upgrade to WMF 5.0 from 4.0 you need to install .net 4.5 or later on your machine first. Then install WMF 5.0 RTM.

[WayBack] Windows Management Framework 4.0

[WayBack] Windows Management Framework 3.0

–jeroen

Posted in CommandLine, Development, PowerShell, PowerShell, Scripting, Software Development | Leave a Comment »

Brew reminder to self

Posted by jpluimers on 2020/08/05

From the update process:

==> Caveats
==> hub
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==> python
Python has been installed as
  /usr/local/bin/python3

Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
  /usr/local/opt/python/libexec/bin

If you need Homebrew's Python 2.7 run
  brew install python@2

You can install Python packages with
  pip3 install 
They will install into the site-package directory
  /usr/local/lib/python3.7/site-packages

See: https://docs.brew.sh/Homebrew-and-Python
==> youtube-dl
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==> mpv
zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==> node
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

–jeroen

Posted in Apple, Development, Home brew / homebrew, Power User, Python, Scripting, Software Development | Leave a Comment »

linux – How do I use sudo to redirect output to a location I don’t have permission to write to? – Stack Overflow

Posted by jpluimers on 2020/07/09

Various ways are explained at [WayBack] linux – How do I use sudo to redirect output to a location I don’t have permission to write to? – Stack Overflow.

Some are for simple commands and can be a one liner (for instance using tee, or executing a secondary shell).

Others are more suited for longer command sequences.

–jeroen

Posted in *nix, *nix-tools, bash, bash, Development, Power User, Scripting, Software Development | Leave a Comment »

13 Noteworthy Points from Google’s JavaScript Style Guide

Posted by jpluimers on 2020/07/07

If I ever go deep into JavaScript: [WayBack] 13 Noteworthy Points from Google’s JavaScript Style Guide.

Via: [WayBack] 13 noteworthy points from Google’s Javascript style guide. https://medium.freecodecamp.org/google-publishes-a-javascript-style-guide-here-are-some-key-… – Lars Fosdal – Google+

Read the rest of this entry »

Posted in Development, JavaScript/ECMAScript, Scripting, Software Development | Leave a Comment »

Programming Wisdom on Twitter: `”The strength of JavaScript is that you can do anything. The weakness is that you will.” – Reg Braithwaite`

Posted by jpluimers on 2020/07/01

[WayBack] Programming Wisdom on Twitter: "The strength of JavaScript is that you can do anything. The weakness is that you will." - Reg Braithwaite

It got commented at by [WayBack] Henrik Hain on Twitter: “My personal highlight :) … “ pointing to [WayBack] is-thirteen/README.md at master · jezen/is-thirteen · GitHub: is-thirteen – Check if a number is equal to 13.

That is an npm I don’t even want to know the dependencies it pulls in (:

I recognised it as Kristian Köhntopp pointed me to it a while ago: FizzBuzz as interview question – video by Tom Scott

–jeroen

 

Posted in Development, History, JavaScript/ECMAScript, Scripting, Software Development | Leave a Comment »

Peeking under the hood of redesigned Gmail – Boris – Medium

Posted by jpluimers on 2020/06/25

From a while back, but still relevant as the speed of the GMail web-UI still has not improved.

[WayBack/Archive.is] Peeking under the hood of redesigned Gmail – Boris – Medium

Via:

–jeroen

Read the rest of this entry »

Posted in CSS, Development, GMail, Google, HTML, JavaScript/ECMAScript, Power User, Scripting, Software Development, Web Development | Leave a Comment »

How to return a string value from a Bash function – Stack Overflow

Posted by jpluimers on 2020/06/17

Cool: you can return strings both as a function result, and by reference: they are explained in the question, second and fourth answer of [WayBack] How to return a string value from a Bash function – Stack Overflow.

Returning them by reference has two important benefits:

  1. it is much faster (especially useful in tight loop)
  2. you can use echo (normally used to return a result) for debugging purposes

I also needed a bit of switch magic which I found at [WayBack] bash – Switch case with fallthrough? – Stack Overflow and array magic (from [WayBack] Array variables) as arrays are far more readable than indirection (on the why not, see [WayBack] BashFAQ/006 – Greg’s Wiki: How can I use variable variables (indirect variables, pointers, references) or associative arrays?).

So here is a function that returns a specific IPv4 octet.

function getIpv4Octet() {
  IPv4=$1
  octetIndex=$2
  outputVariable=$3

  slice="${IPv4}"
  count=1
  while [ "${count}" -le 4 ]
  do
    octet[${count}]="${slice%%.*}"
    slice="${slice#*.}"
    count=$((count+1))
  done
   
  case "${octetIndex}" in
    "1" | "2" | "3" | "4")
      ;;
    *)
      octetIndex="4"
      ;;
  esac
  eval $outputVariable="${octet[$octetIndex]}"
}

You call it like this:

$ getIpv4Octet "192.168.178.32" 3 result && echo ${result}
178

–jeroen

Posted in *nix, *nix-tools, bash, bash, Development, Power User, Scripting, Software Development | Leave a Comment »

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