fortls 2.2.0

fortls - Fortran Language Server

fortls - the Fortran Language Server

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

Editor extensions that can integrate with fortls to provide autocomplete and other IDE-like functionality are available for Visual Studio Code, Atom, Visual Studio, (Neo)vim, and Emacs.

fortls vs fortran-language-server

This project is based on @hansec's original Language Server 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 bug fixes and new features 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 is potentially subject to change.

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 unimported variables/objects in interface blocks
  • Statement placement errors (CONTAINS, IMPLICIT, IMPORT)
• Code actions (textDocument/codeAction) [Experimental]
  • Generate type-bound procedures and implementation templates for deferred procedures

Notes/Limitations

• Signature help is not available for overloaded subroutines/functions
• Diagnostics are only updated when files are saved or opened/closed

Installation

pip install fortls

Warning: 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.

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

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

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 implementation/Peek implementation
textDocument/references	Find all/Peek references
textDocument/rename	Rename a symbol across the workspace
textDocument/codeAction	Experimental Generate code

Acknowledgements

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

Support

If you want to support this project you can do it through

Support the original project go here

Bug reports

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

License

This project is made available under the MIT License.