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Q&A

General Q&A about programming, scripting, software design & architecture, process, tools, testing, and more.

57%
+2 −1
How to pass in a readable file (stream) to a Zig function?

Most of the example code in the Zig online docs is in the form of test blocks. Sadly, this means there aren't quite enough examples of how to write functions. Given that one has a readable file, p...

0 answers  ·  posted 9mo ago by aghast‭

77%
+5 −0
PGP sign emails sent with git-send-email(1)

How can we use git-send-email(1) to sign patches (emails) with the gpg(1) keyring? I've heard it can be done, but couldn't find anything in the git-send-email(1) documentation nor in a web search.

2 answers  ·  posted 9mo ago by alx‭  ·  last activity 9mo ago by alx‭

71%
+3 −0
How to define custom configurations in new-style .csproj?

Problem I'm trying to update some projects from old-style .csproj: &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.mi...

1 answer  ·  posted 2y ago by Peter Taylor‭  ·  last activity 9mo ago by Peter Taylor‭

80%
+6 −0
array of arrays vs array of pointers to store array of string literals

Let's consider the following code: const char a[][4] = {"aa", "aaa"}; const char *b[] = {"bb", "bbb"}; const char *const c[] = {"cc", "ccc"}; For shared libraries, both b and c arrays require...

0 answers  ·  posted 9mo ago by alx‭  ·  edited 9mo ago by alx‭

84%
+9 −0
Vim: how to search for all instances of a string, except for those that are between two specific strings

Using Vim, I am trying to search for all instances of a specific string, except for those that fall somewhere in between two other specific strings. For example, I want to determine all instances ...

2 answers  ·  posted 9mo ago by Trevor‭  ·  last activity 9mo ago by Dirk Herrmann‭

66%
+2 −0
Order a subcollection from linq

I am using linq/EF core to retrieve data via an API call. How do I sort the collection of related data for each retrieved entity? Assume the following structure: an Order is made on a certain da...

1 answer  ·  posted 10mo ago by mcalex‭  ·  last activity 10mo ago by Alexei‭

83%
+8 −0
Is it possible to undo a git reset?

For some reason, I just wanted to undo a commit on my git repository, which I've done with the following command: git reset --soft HEAD~1 So far, so good. However, by mistake I issued the comma...

2 answers  ·  posted 10mo ago by celtschk‭  ·  edited 10mo ago by Alexei‭

33%
+0 −2
How to solve missing JAR files error from Ant

I keep getting this error: Cause: the class org.apache.tools.ant.taskdefs.optional.ssh.SSHExec was not found. This looks like one of Ant's optional components. Action: Check that the ap...

1 answer  ·  posted 10mo ago by Megan‭  ·  last activity 10mo ago by Megan‭

66%
+2 −0
C# WPF datagrid not persisting inserts

I am working with VS 2022 and trying to make a WPF MVVM application. The application updates the items displayed in the datagrid, persisting the changes to the database upon save. However, adding a...

0 answers  ·  posted 10mo ago by FrankLuke‭

40%
+2 −4
Child process works only once after the parent's two calls to scanf

This program creates a child process and shares two integers (base and height) through the shared memory. The parent process asks four times to insert two integers and wait for the child process t...

1 answer  ·  posted 10mo ago by Luca_Impellizzeri‭  ·  last activity 10mo ago by Alexei‭

60%
+1 −0
How to set update-crypto-policies to LEGACY in Dockerfile

So im trying to do RUN update-crypto-policies --set LEGACY in my Dockerfile as I was getting an error "Failed to load certificate from file 'client-rsa.pem':''ee key too small". But when I build...

2 answers  ·  posted 10mo ago by Megan‭  ·  last activity 10mo ago by Megan‭

77%
+5 −0
How to open a file and edit its content in groovy script

I have a Makefile in my Jenkins job's workspace, that I want to edit out certain parts from and then save it, before running next part of the script that uses this Makefile. The part that I want t...

2 answers  ·  posted 10mo ago by Megan‭  ·  last activity 10mo ago by Alexei‭

60%
+4 −2
Watertight Mesh Representation

A watertight mesh is one which does not have holes, and for which each face has a designated inside and outside. Such a mesh can be "tetrahedralized", has a defined volume, and can be an operand in...

0 answers  ·  posted 11mo ago by Josh Hyatt‭  ·  edited 10mo ago by Josh Hyatt‭

75%
+4 −0
Is it possible to write protocols for enumerations in Python?

Having recently learned about protocols in Python, I now wonder if you can write a protocol for enumerations. That is, a protocol that says that you are supposed to pass an enum that has certain it...

1 answer  ·  posted 10mo ago by celtschk‭  ·  last activity 10mo ago by r~~‭

28%
+0 −3
What is [{options}] in JavaScript?

I am trying to understand this code: const iframes = iFrameResize( [{options}], [css selector] || [iframe] ); The code can be found in this documentation. Is [{options}] an array of objects an...

1 answer  ·  posted 11mo ago by deleted user  ·  last activity 11mo ago by hkotsubo‭

57%
+2 −1
What is Backus–Naur form as applied in computer programming?

What is Backus–Naur form as applied in computer programming? From Wikipedia In computer science, Backus–Naur form (/ˌbækəs ˈnaʊər/) or Backus normal form (BNF) is a metasyntax notation for cont...

1 answer  ·  posted 11mo ago by deleted user  ·  last activity 11mo ago by r~~‭

77%
+5 −0
Mapping generic handler to generic query in MediatR

I am using MediatR in an ASP.NET Core 3.1 application and I want use a generic query and a generic request that deals with getting lists of some standard items I am using in drop-downs and similar:...

0 answers  ·  posted 2y ago by Alexei‭  ·  edited 11mo ago by Alexei‭

77%
+5 −0
Why can't a derived class add a const qualifier to a method?

Say we have an abstract class Foo declared as so: class Foo { public: virtual void test() = 0; }; Let's say that we make a derived concrete class FooDerived, and decide to mark it's ve...

2 answers  ·  posted 11mo ago by Moshi‭  ·  last activity 11mo ago by Dirk Herrmann‭

77%
+5 −0
How should one match a specialized version of a variant?

Let's say I have a variant that can hold a bunch of different types of values (say I got them from parsing a JSON or similar). using Value = std::variant&lt;std::monostate, int, double, std::strin...

0 answers  ·  posted 11mo ago by Moshi‭  ·  edited 11mo ago by Moshi‭

25%
+0 −4
Does a for...of loop must contain a variable without assignment sign, and why?

The following code pattern reflects this answer. This code contains a for...of loop: for (const child of e.childNodes) { // Do stuff; } Does a for...of loop must contain a variable without...

1 answer  ·  posted 11mo ago by deleted user  ·  edited 11mo ago by hkotsubo‭

33%
+1 −4
How this recursive treewalker works?

Credit for User:Meriton for developing the following code (first published here). function replaceIn(e) { if (e.nodeType == Node.TEXT_NODE) { e.nodeValue = e.nodeValue.replaceAll("a", "");...

3 answers  ·  posted 11mo ago by deleted user  ·  last activity 11mo ago by hkotsubo‭

30%
+1 −5
Explaining the result of an arithmetic expression in JavaScript

I misunderstand why the following code outputs -1 in console. x = 42; x = (x == 42) * -1 + (x != 42) * x; -1 Due to Type Coercion, the comparison of x to 42 yields true and is thus transl...

2 answers  ·  posted 11mo ago by deleted user  ·  edited 11mo ago by Alexei‭

40%
+0 −1
Is there a JavaScript command to remove all CSS pseudo-elements whatsoever in a document? [closed]

In a dense DOM tree created by a content management system which I didn't create and don't know much about there might be pseudo elements hiding in various places. To ensure that, I want to run so...

0 answers  ·  posted 11mo ago by deleted user  ·  closed 11mo ago by Alexei‭

66%
+4 −1
Load environment variables from .env file in Python 3 [closed]

In Python 2, I was able to create a file named .env within a project folder like so: # .env MY_ID=abc123 TOKEN=4567890 Then in a Python file in the same directory, I could read these variable...

0 answers  ·  posted 1y ago by laserkittens‭  ·  closed 11mo ago by Alexei‭

28%
+0 −3
How to make this treewalker code having a regular for loop or a forEach() method?

Credit for User:Meriton for developing the following code (first published here). function replaceIn(e) { if (e.nodeType == Node.TEXT_NODE) { e.nodeValue = e.nodeValue.replaceAll("a", "");...

1 answer  ·  posted 11mo ago by deleted user  ·  edited 11mo ago by Alexei‭

50%
+1 −1
Recursion without a procedure ("function") in JavaScript

Credit for User:Meriton for developing the following code (first published here): function replaceIn(e) { if (e.nodeType == Node.TEXT_NODE) { e.nodeValue = e.nodeValue.replaceAll("a", "");...

3 answers  ·  posted 11mo ago by deleted user  ·  edited 11mo ago by Alexei‭

37%
+1 −3
Are there textual-formats for documenting actions in Graphical Windows systems? [closed]

I've recently been involved with creating text documentation of steps for workflows in graphical windows systems (and web-pages). These are often somewhat wordy, for example: "Click on the 'Exit' ...

0 answers  ·  posted 1y ago by CodeFarmer‭  ·  closed 11mo ago by Alexei‭

75%
+4 −0
What are the types of DOM nodes?

If I am not mistaken any DOM "tree" node is actually a "branch", which would be an HTML element or perhaps a CSS pseudo-element, of course. If that's true what are the different node types and esp...

1 answer  ·  posted 11mo ago by deleted user  ·  last activity 11mo ago by hkotsubo‭

70%
+5 −1
Delete all occurrences of a character in a webpage with vanilla JavaScript

Primarily for learning, I would like to try to delete a specific character (letter or number or special character), wherever it is in a webpage, with vanilla JavaScript. The webpage won't change a...

3 answers  ·  posted 11mo ago by deleted user  ·  last activity 11mo ago by hkotsubo‭

80%
+6 −0
How to declare variable-length arrays correctly?

This is meant as a FAQ Q&amp;A regarding variable-length arrays (VLA). The two bugs described below are surprisingly common. I'm trying to use the variable-length arrays feature of C99 (and newe...

1 answer  ·  posted 1y ago by Lundin‭  ·  last activity 11mo ago by Lundin‭

71%
+3 −0
Is `-isystem` a POSIX cc option?

Is -isystem/path/to/sys/includes a standard compiler option, or is it a compiler extension implemented by gcc, clang, and maybe other compilers? Can I rely on its availability? I couldn't find th...

1 answer  ·  posted 11mo ago by alx‭  ·  last activity 11mo ago by InfiniteDissent‭

60%
+1 −0
How to access the visual editor from JavaScript in MediaWiki?

In MediaWiki 1.36.1 with Skin:Timeless, the following JavaScript code doesn't work. I get in browser console: Your skin is incompatible with VisualEditor. See https://www.mediawiki.org/wiki/Exte...

0 answers  ·  posted 11mo ago by deleted user  ·  edited 11mo ago by deleted user

77%
+5 −0
TypeScript is unable to infer the correct type for a mapped tuple

I was playing around with mapped tuples and came across an interesting case where TypeScript cannot infer the types used: interface Foo&lt;A, B&gt; { (a: A, b: B): any } function test&lt;...

0 answers  ·  posted 11mo ago by Moshi‭  ·  edited 11mo ago by Moshi‭

50%
+0 −0
MediaWiki JavaScript way to view the history of a page

I wish to view the revision-history-webpage of a webpage in MediaWiki without the conventional button to do so (I've disabled that button for aesthetic reasons). Please disable the MediaWiki View ...

1 answer  ·  posted 11mo ago by deleted user  ·  last activity 11mo ago by deleted user

25%
+0 −4
Unable to boot from manjaro usb key [closed]

Unable to boot from manjaro usb key it looks like it is due to secure boot how can I do it without disabling the secure boot

0 answers  ·  posted 11mo ago by hedibensaid‭  ·  closed 11mo ago by Alexei‭

25%
+0 −4
Unable to boot from popos usb key [closed]

Hi How can I boot from usb key containing popos system without disabling secure boot in bios ? thanks

0 answers  ·  posted 11mo ago by hedibensaid‭  ·  closed 11mo ago by Alexei‭

81%
+7 −0
Console scripts in virtual environment do not output to terminal in git bash

I have console scripts in my virtual environment in \env\Scripts, installed with packages (e.g. black, pytest, coverage). If I try to execute these in Git Bash, the output is not returned to the te...

1 answer  ·  posted 1y ago by boudewijn21‭  ·  last activity 11mo ago by boudewijn21‭

66%
+2 −0
Access denied to read SQS queue just created

I've been trying to get Amazon SQS working with the v3 JS client. I've gotten to the point where I can successfully create a queue using the frontend, but the issue starts when I try and send/recei...

1 answer  ·  posted 11mo ago by Darvids0n‭  ·  last activity 11mo ago by Darvids0n‭

50%
+1 −1
Why does a keydown event is listened only once?

The following code (credit for user:hkotsubo) moves the user to another page if Alt+Shift+E are pressed together. window.addEventListener('DOMContentLoaded', () =&gt; { let domain = window.loca...

0 answers  ·  posted 11mo ago by deleted user

75%
+4 −0
Move to the edit webpage of a webpage via the keyboard with vanilla JavaScript

The webpage example.com has an edit webpage (from which one can edit example.com itself). example.com/index.php?title=עמוד_ראשי&amp;action=edit I want that after I click ALT+Shift+E, I would im...

1 answer  ·  posted 11mo ago by deleted user  ·  last activity 11mo ago by hkotsubo‭

75%
+4 −0
What version of runtime environment does a .NET 5 application actually needs?

Our team deals with a legacy application that relies on a rather old deployment process and infrastructure: we deploy the application on an environment very similar to the production called Clon...

0 answers  ·  posted 11mo ago by Alexei‭  ·  edited 11mo ago by Alexei‭

75%
+4 −0
How to set FontFamily for an entire WPF application in a theme?

I have a project Anonymised.Theme which contains XAML resource dictionaries for a theme. This is used by about a dozen applications which simply include it by merging &lt;ResourceDictionary Source...

2 answers  ·  posted 12mo ago by Peter Taylor‭  ·  last activity 11mo ago by aresavatar‭

83%
+8 −0
How to delete contents of a specific field, if it matches a pattern and there is nothing else in the field

How do I delete contents of a specific field, if it matches a pattern, and there is nothing else in the field? I have a several GB tsv file, and I am interested in a specific field (72). If it cont...

3 answers  ·  posted 12mo ago by LVx0‭  ·  last activity 11mo ago by Dirk Herrmann‭

50%
+0 −0
Using single xml file two activities in android

I want use single layout xml file for two different activities in android. Is it possible? How can I do it?

0 answers  ·  posted 11mo ago by akshayshelke‭

50%
+0 −0
How to uncollapse an entire link tree with JavaScript?

This data tree is comprised of clickable buttons and I want to expose all branches, in a single action, instead of clicking each vertical arrow button anew. I have tried the following code which d...

1 answer  ·  posted 11mo ago by deleted user  ·  edited 11mo ago by Alexei‭

50%
+0 −0
In angular-imask how do I get the IMask class?

Using Angular-IMask, I'm programatically updating the field that has IMask. So I'm getting the error: "Element value was changed outside of mask. Syncronize mask using mask.updateValue() to work p...

0 answers  ·  posted 12mo ago by nelson777‭  ·  edited 11mo ago by nelson777‭

40%
+0 −1
How to uncollapse the first and second tiers of a link tree in JavaScript?

I wish to display the first and second branches of a link tree with JavaScript. I want to show these branches in a single action, instead of clicking each vertical arrow (link) anew. HTML examp...

2 answers  ·  posted 12mo ago by deleted user  ·  last activity 11mo ago by hkotsubo‭

86%
+11 −0
Should I check if pointer parameters are null pointers?

When writing any form of custom function such as this: void func (int* a, int* b) Should I add code to check if a and b are null pointers or not? if(a == NULL) /* error handling */ When po...

4 answers  ·  posted 12mo ago by Lundin‭  ·  last activity 12mo ago by Dirk Herrmann‭

80%
+6 −0
Is there a name for a data format like `key[type]=value`?

I'm working on an integration with a proprietary (black box) system. There is some TCP communication that occurs between two microservices. I've managed to sniff the traffic and it's being sent in...

0 answers  ·  posted 12mo ago by Welz‭  ·  edited 12mo ago by Welz‭

77%
+5 −0
Which functions in the C standard library must always be avoided?

It would seem that the C standard library is a collection of diverse functions that pretty much just ended up in the standard by tradition or "accident", rather than through some careful plan or ra...

1 answer  ·  posted 12mo ago by Lundin‭  ·  last activity 12mo ago by Lundin‭