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.

Features

• 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
  • IOS_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

Notes/Limitations

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

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.

Installation

PyPi

pip install fortls

Anaconda

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 binary 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

Settings

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

Acknowledgements

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

Bug reports

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

Security Policy

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

License

This project is made available under the MIT License.