Fortran Language Server Protocol Extension

This is a Visual Studio 2022 extension that makes use of fortls as a Fortran Language Server.

How to use

• Build the project in Visual Studio in Release. Install the resulting VSIX file. I intend to publish the extension on the Visual Studio Marketplace.
• Install an implementation of the Language Server Protocol for Fortran, currently fortls; for example "python -m pip install fortls".
• By default, fortls will be searched on the Path. This can be changed in Visual Studio by going to Tools->Options->Fortran Language Server->Options->Executable (path) option. It is possible to specify the full path to an executable, or another Fortran language server protocol implementation than fortls if one is available.
• There are some default command line arguments passed to the language server protocol implementation. These can be changed in Tools->Options->Fortran Language Server->Options->Command Line Arguments.
• In Visual Studio, go to Tools->Options->Text Editor->Fortran->Advanced and turn off the Intel Fortran Browsing/Navigation options (optional).
• Parsing the files may take some time, depending on the project size. Happy coding!

Resources for development

This project mostly follows the adding-an-lsp-extension page for creating the code. The options page was added by following creating-an-options-page, and the accessing of options uses getting-service-information-from-the-settings-store.

The logo was taken from Fortran-lang (MIT License). For syntax highlighting, the TextMate grammars were taken from the Visual Studio Code extension (MIT License). I have used the TextMate Languages VSCode extension to convert the json grammar files to xml. Only the fortran_free-form.tmLanguage file is used, because I was not able to turn on syntax highlighting when more than one grammar file was included.

Prior art

Fortran IntelliSense: Another extension for Visual Studio 2017 that is very similar, probably because it was based on the same tutorial pages.