There are a number of static methods in the browserWindow class in electronjs, one of which is a static method that will create and return a collection of all browser windows currently open. This post will then be a quick example of the use of this static method of the browserWindow class. While I am at it I will of course be touching base on a bunch of additional features in electronjs in general, such as the preload script, and various events for the browser window class. Mainly the close and ready to show events of the Browser window class that I will be using to update a simple message in each browser window when a new window is opened or closed. So if you are still fairly new to electronjs as well this might prove to be a good exercise in order to gain some insight to various features that have to do with a collection of browser windows.

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I like working with Raspberry PI single board computers, not so much when it comes to making hardware projects but actually using them as a replacement for what would otherwise be an energy hogging desktop computer when it comes to getting work done.

Anyway when it comes to using a Raspberry PI in general I often find myself re-imaging sd cards a lot, and each time I do so I need to setup everything the way that I want it again which can get a bit annoying. I have to set a background image that pertains to a certain use case for the OS image of the sd card so I know right away what kind of setup I am dealing with for example. That is that I like to have a single background image, or set of background images that I would want to have on the screen to let me know that the current sd card that I am using is an OS image that is setup for getting work done rather than doing something fun, or experimental. Another thing that I often like to change is the value of the \$PS1 variable that is set in a bashrc file, so I have a custom command prompt each time I open a new terminal window as I do not like the default one with a clean Raspberry PI OS install.

In this post then I will be going over some bash scripts that have to do with a setup script that will automate this process of setting up a new sd card just the way that I like it. There is a main setup.sh file that can be called that will run over each part script that preforms some kind of task such as copying over and setting a background image, or backing up and creating a custom bashrc file at the home path. However if I do things the way I that they should be done each part script should also work on its own if I just want to do one little thing in this collection of setup scripts.

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One major part of doing anything interesting with threejs is learning how to go about positioning things when it comes to working with the Vector3 class in the library. There are the very basics with this class when it comes to starting out with the set, and copy methods for example. However there are also a number of other useful methods in this class including methods like the multiply scalar method which will be the main focal point of this post today.

The multiply scalar method is a way to adjust the unit length of the vector, without changing anything with the direction. In other words it is a way to change the position of the vector, but only along a line that passes threw the origin that is found by way of the current values of the Vector. I often use this multiply scalar method in combination with other Vector3 methods such as the normalize method that will set the unit length of the vector to that of one, which would be a good starting point before using a method like the multiply scalar. There are also a wide range of other vector3 class methods that have to do with adjusting the direction in combination of the length so I will be writing about those as well here of course.

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For todays post on electronjs I will be going over a quick example of the send method of the webContents object of a browser window object instance. The reason why I am writing a post on this is because even though I have only wrote a few example of electronjs thus far I can all ready see that this will be a feature that I will be using with a lot of future projects.

The general idea here is that the send method is a way to go about emitting an event for a render process, and so my attaching an event hander for a method that I define in my preload script, it can be used as a way to replay to a custom menu option in the browser window. Speaking of preload scripts, and custom menus, this example will also be a good starting point for these things, however this is still not a getting started with electron type post as I have wrote that one all ready.

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When writing a bash script or two I will often want to resolve a relative path to an absolute one. For this kind of task there is using the Linux dirname command to get a folder from a path that might contain a file in the path string, but the resulting path might end up being a relative path rather than and absolute one, so then there is piping that result to an additional command called the Linux realpath command.

In some cases I might also want to get the filename also when working with paths and for that sort of thing there is the basename command. However in this post I will mainly be focusing on the use of the realpath command and the dirname command to resolve a relative path to not just resolve an absolute path but also to get a folder name rather than a path that induces a filename. This is a typical thing that I am going to want to do when writing bash scripts as there might be additional scripts and other assets in the folder in which the script is being called that I will want to run or use in some way, and I want to be able to get paths to those resources in a way in which the script will still work if the containing folder is move somewhere else.

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