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GitHub - fortran-lang/fortls: fortls - Fortran Language Server

fortls - Fortran Language Server

fortls is an implementation of the Language Server Protocol (LSP) for Fortran using Python (3.7+).

All code editors that support LSP can integrate with fortls see the section Editor Integration in the documentation. Some supported code editors include: Visual Studio Code, Atom, Sublime Text, (Neo)Vim, and Emacs.

Project-wide and Document symbol detection and Renaming
Hover support, Signature help and Auto-completion
GoTo/Peek implementation and Find/Peek references
Preprocessor support
Documentation parsing (Doxygen and FORD styles)
Access to multiple intrinsic modules and functions
- ISO_FORTRAN_ENV GCC 11.2.0
- ISO_C_BINDING GCC 11.2.0
- IEEE_EXCEPTIONS, IEEE_ARITHMETIC, IEEE_FEATURES GCC 11.2.0
- OpenMP OMP_LIB, OMP_LIB_KINDS v5.0
- OpenACC OPENACC, OPENACC_KINDS v3.1
Diagnostics
- Multiple definitions with the same variable name
- Variable definition masks definition from parent scope
- Missing subroutine/function arguments
- Unknown user-defined type used in TYPE/CLASS definition (only if visible in project)
- Unclosed blocks/scopes
- Invalid scope nesting
- Unknown modules in USE statement
- Unimplemented deferred type-bound procedures
- Use of non-imported variables/objects in interface blocks
- Statement placement errors (CONTAINS, IMPLICIT, IMPORT)
Code actions
- Generate type-bound procedures and implementation templates for deferred procedures

Signature help and hover does not handle elegantly overloaded functions i.e. interfaces

The full documentation for fortls can be found at fortls.fortran-lang.org.

conda install -c conda-forge fortls

for more information about the Anaconda installation see

Common installation problems

It is NOT recommended having fortls and fortran-language-server simultaneously installed, since they use the same executable name. If you are having trouble getting fortls to work try uninstalling fortran-language-server and reinstalling fortls.

With pip

pip uninstall fortran-language-server
pip install fortls --upgrade

or with Anaconda

conda uninstall fortran-language-server
conda install -c conda-forge fortls

fortls can be configured through both the command line e.g. fortls --hover_signature or through a Configuration json file. The two interfaces are identical and a full list of the available options can be found in the Documentation or through fortls -h

An example for a Configuration file is given below

{
  "incremental_sync": true,
  "lowercase_intrinsics": true,
  "hover_signature": true,
  "use_signature_help": true,
  "excl_paths": ["tests/**", "tools/**"],
  "excl_suffixes": ["_skip.f90"],
  "include_dirs": ["include/**"],
  "pp_suffixes": [".F90", ".h"],
  "pp_defs": { "HAVE_HDF5": "", "MPI_Comm": "integer" }
}

Implemented server requests Request Description workspace/symbol Get workspace-wide symbols textDocument/documentSymbol Get document symbols e.g. functions, subroutines, etc. textDocument/completion Suggested tab-completion when typing textDocument/signatureHelp Get signature information at a given cursor position textDocument/definition GoTo definition/Peek definition textDocument/references Find all/Peek references textDocument/documentHighlight Same as textDocument/references textDocument/hover Show messages and signatures upon hover textDocument/implementation GoTo implementation/Peek implementation textDocument/rename Rename a symbol across the workspace textDocument/didOpen Document synchronisation upon opening textDocument/didSave Document synchronisation upon saving textDocument/didClose Document synchronisation upon closing textDocument/didChange Document synchronisation upon changes to the document textDocument/codeAction Experimental Generate code

fortls has reached a point where it is feature complete and stable enough to be used in many modern Fortran projects without any issues. It does however still have fundamental limitations, namely its ability to understand all Fortran syntax and semantics that has been used throughout the 65+ years of the language. The good news is that we have a plan to address this issue!

We are excited to announce that we are working on creating a new Fortran Language Server based on the actively developed LFortran compiler 🎉. The new Language Server will be able to understand all Fortran syntax, be faster, and give more accurate autocompletion, hover and diagnostic information. That means we plan on investing any future funding on creating our new language server and ultimately creating a better user experience for everyone.

Not to worry, fortls will continue to be here. We will keep fortls in active maintenance mode with bug fixes and new features from volunteer contributors, but otherwise we will be focusing our efforts into making the new language server using LFortran's parser a reality.

fortls vs fortran-language-server

This project was originally based on fortran-language-server LSP implementation, but the two projects have since diverged.

fortls (this project) is now developed independently of the upstream hansec/fortran-language-server project and contains numerous new features and bug fixes the original fortran-language-server does not.

For a complete and detailed list of the differences between the two Language Servers see the Documentation section: Unique fortls features (not in fortran-language-server)

The name of executable for this project has been chosen to remain fortls to allow for integration with pre-existing plugins and workflows, but it could change in the future.

This project would not have been possible without the original work of @hansec in fortran-language-server

You can support Fortran-lang as a whole by donating at Fortran-lang - NumFOCUS.

When filing bugs please provide example code to reproduce the observed issue.

To report a security vulnerability please follow the instructions in our Security page.

This project is made available under the MIT License.

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