VSCode: Vala Development

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How to setup VSCodium (Open Source Visual Studio Code) for Vala development.
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VSCodium
Install VSCodium from deb package (as documented on the official website).
Add the GPG key of the repository:
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wget -qO - https://gitlab.com/paulcarroty/vscodium-deb-rpm-repo/raw/master/pub.gpg | gpg --dearmor | sudo dd of=/etc/apt/trusted.gpg.d/vscodium.gpg
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Add the repository:
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echo 'deb https://paulcarroty.gitlab.io/vscodium-deb-rpm-repo/debs/ vscodium main' | sudo tee --append /etc/apt/sources.list.d/vscodium.list
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Update package information and install vscodium:
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sudo apt update && sudo apt install codium
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Syntax Highlighting
To begin with, you need to install the Vala Plugin for Visual Studio Code:
1.Visit the plugin's website and click "Download Extension" (a *.vsix file)
2.Run VSCodium
3.From within VSCodium, open the Extensions tab (Ctrl + Shift + X)
4.Click ... > Install from VSIX... on top of the Extensions sidebar
5.Select the previously downloaded *.vsix file and click Install
Now you can install the Vala Language Server. For this, open a Terminal and execute the following command:
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sudo apt install vala-language-server
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Debugging
Install the CodeLLDB Plugin for Visual Studio Code:
1.Visit the plugin's website and click "Download Extension" (a *.vsix file)
2.Run VSCodium
3.From within VSCodium, open the Extensions tab (Ctrl + Shift + X)
4.Click ... > Install from VSIX... on top of the Extensions sidebar
5.Select the previously downloaded *.vsix file and click Install
Now you can install the LLDB Debugger. For this, open a Terminal and execute the following command:
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sudo apt install lldb
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Make sure to restart VSCodium and then you are nearly ready to start: When you start the debugger the first time in a project, it will ask for a run configuration. Here's a minimal one which should be enough to get you started:
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{
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  "version": "0.2.0",
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  "configurations": [{
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    "type": "lldb",
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    "request": "launch",
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    "name": "Debug",
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    "program": "${workspaceFolder}/build/src/com.github.myteam.myapp",
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    "args": [],
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    "cwd": "${workspaceFolder}"
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  }]
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}
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If you want to know more, make sure to have a look at the README in the CodeLLDB repo.
Further Reading
​VSCodium: Open Source Binaries of VSCode​
​Vala Plugin for Visual Studio Code​
​CodeLLDB Plugin for Visual Studio Code​
​Vala Language Server on GitHub​
​How To Add PPA Repository Manually Without "add-apt-repository" On Ubuntu​
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