tuple index out of range

[GregoireLD]

Hi Everyone,

I hope I'm in the right place, I wanted to give Fortran a try, installed gfortran and successfully compiled some code.
I then installed fortls and modern-fortran to use Fortran in VSCode, but every time I open a simple "hello world" (compilable) .f90 file I get the following error :

[Error - 2:35:20 PM] Server initialization failed.
Message: tuple index out of range

Does anyone have any idea what I might be doing wrong ?

I use :
Modern Fortran 3.2.0
fortls 2.12.0 (and no fortran-language-server installed)
Python3 3.9.13
gcc 11.3.0
Mac M1 (arm64)

[gnikit]

Hi @GregoireLD can you please provide the contents of the Fortran file? This looks like a bug in fortls

[GregoireLD]

Of course 😊

program HelloWorld
    write (*,*) 'Hello, world!'
end program HelloWorld

I tried the easiest test to avoid problems from libraries and such

[awvwgk]

You can format code blocks by using backticks ` for a literal code block you can use

```f90

To get Fortran syntax highlighting. Otherwise, write(*,*) and similar will be turned to write(,) with an italic comma.

I just edited your comment to properly show the source code.

[GregoireLD]

If it's of any use, in the log I get a more precise indication of what's going wrong :

(sorry it's a mouthful, I don't know if that's normal)

error handling request {'jsonrpc': '2.0', 'id': 0, 'method': 'initialize', 'params': {'processId': 7161, 'clientInfo': {'name': 'Visual Studio Code', 'version': '1.69.0'}, 'locale': 'en-gb', 'rootPath': None, 'rootUri': None, 'capabilities': {'workspace': {'applyEdit': True, 'workspaceEdit': {'documentChanges': True, 'resourceOperations': ['create', 'rename', 'delete'], 'failureHandling': 'textOnlyTransactional', 'normalizesLineEndings': True, 'changeAnnotationSupport': {'groupsOnLabel': True}}, 'configuration': True, 'didChangeWatchedFiles': {'dynamicRegistration': True, 'relativePatternSupport': True}, 'symbol': {'dynamicRegistration': True, 'symbolKind': {'valueSet': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26]}, 'tagSupport': {'valueSet': [1]}, 'resolveSupport': {'properties': ['location.range']}}, 'codeLens': {'refreshSupport': True}, 'executeCommand': {'dynamicRegistration': True}, 'didChangeConfiguration': {'dynamicRegistration': True}, 'workspaceFolders': True, 'semanticTokens': {'refreshSupport': True}, 'fileOperations': {'dynamicRegistration': True, 'didCreate': True, 'didRename': True, 'didDelete': True, 'willCreate': True, 'willRename': True, 'willDelete': True}, 'inlineValue': {'refreshSupport': True}, 'inlayHint': {'refreshSupport': True}, 'diagnostics': {'refreshSupport': True}}, 'textDocument': {'publishDiagnostics': {'relatedInformation': True, 'versionSupport': False, 'tagSupport': {'valueSet': [1, 2]}, 'codeDescriptionSupport': True, 'dataSupport': True}, 'synchronization': {'dynamicRegistration': True, 'willSave': True, 'willSaveWaitUntil': True, 'didSave': True}, 'completion': {'dynamicRegistration': True, 'contextSupport': True, 'completionItem': {'snippetSupport': True, 'commitCharactersSupport': True, 'documentationFormat': ['markdown', 'plaintext'], 'deprecatedSupport': True, 'preselectSupport': True, 'tagSupport': {'valueSet': [1]}, 'insertReplaceSupport': True, 'resolveSupport': {'properties': ['documentation', 'detail', 'additionalTextEdits']}, 'insertTextModeSupport': {'valueSet': [1, 2]}, 'labelDetailsSupport': True}, 'insertTextMode': 2, 'completionItemKind': {'valueSet': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]}, 'completionList': {'itemDefaults': ['commitCharacters', 'editRange', 'insertTextFormat', 'insertTextMode']}}, 'hover': {'dynamicRegistration': True, 'contentFormat': ['markdown', 'plaintext']}, 'signatureHelp': {'dynamicRegistration': True, 'signatureInformation': {'documentationFormat': ['markdown', 'plaintext'], 'parameterInformation': {'labelOffsetSupport': True}, 'activeParameterSupport': True}, 'contextSupport': True}, 'definition': {'dynamicRegistration': True, 'linkSupport': True}, 'references': {'dynamicRegistration': True}, 'documentHighlight': {'dynamicRegistration': True}, 'documentSymbol': {'dynamicRegistration': True, 'symbolKind': {'valueSet': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26]}, 'hierarchicalDocumentSymbolSupport': True, 'tagSupport': {'valueSet': [1]}, 'labelSupport': True}, 'codeAction': {'dynamicRegistration': True, 'isPreferredSupport': True, 'disabledSupport': True, 'dataSupport': True, 'resolveSupport': {'properties': ['edit']}, 'codeActionLiteralSupport': {'codeActionKind': {'valueSet': ['', 'quickfix', 'refactor', 'refactor.extract', 'refactor.inline', 'refactor.rewrite', 'source', 'source.organizeImports']}}, 'honorsChangeAnnotations': False}, 'codeLens': {'dynamicRegistration': True}, 'formatting': {'dynamicRegistration': True}, 'rangeFormatting': {'dynamicRegistration': True}, 'onTypeFormatting': {'dynamicRegistration': True}, 'rename': {'dynamicRegistration': True, 'prepareSupport': True, 'prepareSupportDefaultBehavior': 1, 'honorsChangeAnnotations': True}, 'documentLink': {'dynamicRegistration': True, 'tooltipSupport': True}, 'typeDefinition': {'dynamicRegistration': True, 'linkSupport': True}, 'implementation': {'dynamicRegistration': True, 'linkSupport': True}, 'colorProvider': {'dynamicRegistration': True}, 'foldingRange': {'dynamicRegistration': True, 'rangeLimit': 5000, 'lineFoldingOnly': True, 'foldingRangeKind': {'valueSet': ['comment', 'imports', 'region']}, 'foldingRange': {'collapsedText': False}}, 'declaration': {'dynamicRegistration': True, 'linkSupport': True}, 'selectionRange': {'dynamicRegistration': True}, 'callHierarchy': {'dynamicRegistration': True}, 'semanticTokens': {'dynamicRegistration': True, 'tokenTypes': ['namespace', 'type', 'class', 'enum', 'interface', 'struct', 'typeParameter', 'parameter', 'variable', 'property', 'enumMember', 'event', 'function', 'method', 'macro', 'keyword', 'modifier', 'comment', 'string', 'number', 'regexp', 'operator', 'decorator'], 'tokenModifiers': ['declaration', 'definition', 'readonly', 'static', 'deprecated', 'abstract', 'async', 'modification', 'documentation', 'defaultLibrary'], 'formats': ['relative'], 'requests': {'range': True, 'full': {'delta': True}}, 'multilineTokenSupport': False, 'overlappingTokenSupport': False, 'serverCancelSupport': True, 'augmentsSyntaxTokens': True}, 'linkedEditingRange': {'dynamicRegistration': True}, 'typeHierarchy': {'dynamicRegistration': True}, 'inlineValue': {'dynamicRegistration': True}, 'inlayHint': {'dynamicRegistration': True, 'resolveSupport': {'properties': ['tooltip', 'textEdits', 'label.tooltip', 'label.location', 'label.command']}}, 'diagnostic': {'dynamicRegistration': True, 'relatedDocumentSupport': False}}, 'window': {'showMessage': {'messageActionItem': {'additionalPropertiesSupport': True}}, 'showDocument': {'support': True}, 'workDoneProgress': True}, 'general': {'staleRequestSupport': {'cancel': True, 'retryOnContentModified': ['textDocument/semanticTokens/full', 'textDocument/semanticTokens/range', 'textDocument/semanticTokens/full/delta']}, 'regularExpressions': {'engine': 'ECMAScript', 'version': 'ES2020'}, 'markdown': {'parser': 'marked', 'version': '1.1.0'}, 'positionEncodings': ['utf-16']}, 'notebookDocument': {'synchronization': {'dynamicRegistration': True, 'executionSummarySupport': True}}}, 'trace': 'off', 'workspaceFolders': None}}
Traceback (most recent call last):
  File "/opt/homebrew/lib/python3.9/site-packages/fortls/langserver.py", line 167, in handle
    resp = handler(request)

I get the feeling it could be either a bug in the way modern-fortran calls fortls, or in fortls itself

[gnikit]

Thanks, a couple of things:

• I don't think the above code compiles, write or print need format specifiers so write(*,*) or print*,
• I tried replicating this with the same version of fortls and Modern Fortran and it all worked.

I also don't see anything wrong with that output. From the terminal could you do me a favour and type the following and paste the output

fortls --debug_filepath your_file.f90 --debug_parser

Also

1. Did you open a folder or just a Fortran file? If you opened a single file, try opening in VS Code the folder (directory instead) where the file is located.
2. Did you try and do something e.g. hover over something or it just failed when you opened the file?

[gnikit]

Also what is your VS Code version? v1.69?

[GregoireLD]

Here is the log :

Testing parser
  File = "/Users/greg/Desktop/test/HelloWorld.f90"
  Detected format: free

=========
Parser Output
=========

=== No PreProc ===

program HelloWorld !!! PROGRAM - Ln:1
end program HelloWorld !!! END PROGRAM Scope - Ln:3

=========
Object Tree
=========

1: helloworld

=========
Exportable Objects
=========

1: helloworld

as for VSCode, it's indeed 1.69.0

So far I just tried opening the file itself, but opening the enclosing folder raises the same error.

And yes, it fails as soon as I open the file, no hovering required

[gnikit]

Okay I am able to replicate this. It's not present on the VS Code Insiders which is what I use, but it does appear to be present on the latest version of VS Code. Let me have a more in depth look.

[GregoireLD]

Great, it was that indeed, it now runs perfectly fine, thanks for your help 😊

I now have to figure out how to get the building task and debugging to work (gdb doesn't seem to be available on m1 Mac for now, lldb however is tho) ^^

[gnikit]

Moved answer to seperate thread, to make it easy to find the solution for people with the same issue in the future.

[gnikit]

The building task is pretty open ended, you can invoke gfortran via a shell task, which is the simplest solution.
In the future we have to add an easier way to build simple projects (single file) and for more complex projects we will be pushing hard for fpm

[gnikit]

Coming back to this, I was able to figure out why my VS Code was crashing, I was passing an incorrect (deprecated) argument in VS Code via the global settings.json file. Which puts slightly at ease because both the server (fortls) and the extension are heavily tested when it comes to how they integrate, so if something was broken it would most likely be from one of the upstream dependencies.
Thankfully that does not appear to be the case.

The error message that you are seeing is effectively passing paths (source, include, exclude, etc.) to fortls incorrectly. fortls has a function that resolves glob patterns and relative paths and then puts them into a set. That is what is failing here, Python's pathlib is trying to resolve a path and it fails in an unexpected manner i.e throws an exception because the user input is not something that pathlib can use.

I need you to check your VS Code (global and workspace) settings.json for any settings that starting with "fortran.fortls...". If there are any defined delete them.

You can quickly check if the options you are passing from VS Code to fortls contain anything custom by looking at the log channel

[GaffaSnobb]

I'm having the same or at least a similar issue with initialising the Fortran Language Server. This happens when I try to open any Fortran file on my Mac (2019 Intel, Ventura 13.0.1). I have re-installed fortls with pip, conda, and brew and made sure that fortran-language-server is not installed on my PC per the instructions on the fortls GitHub page. I did a complete purge of vscode on my PC and made sure to remove all settings and extensions and reinstalled vscode with brew. Then I installed only the Modern Fortran extension which then prompted me to enable fortls resulting in the following output (exactly the same as before i reinstalled vscode). I use Python 3.11 and I also tested this with Python 3.8 just to be sure that the problem was not with using a very new version of Python:

Output from Modern Fortran in vscode

["INFO" - 17:04:00] Extension Name: Modern Fortran
["INFO" - 17:04:00] Extension Version: 3.2.0
["INFO" - 17:04:00] Linter set to: gfortran
["INFO" - 17:04:00] Formatter set to: findent
["INFO" - 17:04:00] Autocomplete set to: fortls
["INFO" - 17:04:00] Hover set to: fortls
["INFO" - 17:04:00] Symbols set to: fortls
["INFO" - 17:04:00] using linter: gfortran located in: /usr/local/bin/gfortran
["INFO" - 17:04:00] Linter.arguments:
-Wall
-ffree-line-length-none
-ffixed-line-length-none
["INFO" - 17:04:00] Linter.include:

["INFO" - 17:04:00] Fortran Language Server
["INFO" - 17:04:00] Initialising Language Server for file: /Applications/kshell/src/kshell.F90 with command-line options: --enable_code_actions, --hover_signature, --use_signature_help, --lowercase_intrinsics, --nthreads=4, --incremental_sync
[Error - 17:04:00] Server initialization failed.
  Message: tuple index out of range
  Code: -32603 
[object Object]
[Error - 17:04:00] Fortran Language Server client: couldn't create connection to server.
  Message: tuple index out of range
  Code: -32603 
[object Object]
error handling request {'jsonrpc': '2.0', 'id': 0, 'method': 'initialize', 'params': {'processId': 3871, 'clientInfo': {'name': 'Visual Studio Code', 'version': '1.77.1'}, 'locale': 'nb', 'rootPath': None, 'rootUri': None, 'capabilities': {'workspace': {'applyEdit': True, 'workspaceEdit': {'documentChanges': True, 'resourceOperations': ['create', 'rename', 'delete'], 'failureHandling': 'textOnlyTransactional', 'normalizesLineEndings': True, 'changeAnnotationSupport': {'groupsOnLabel': True}}, 'configuration': True, 'didChangeWatchedFiles': {'dynamicRegistration': True, 'relativePatternSupport': True}, 'symbol': {'dynamicRegistration': True, 'symbolKind': {'valueSet': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26]}, 'tagSupport': {'valueSet': [1]}, 'resolveSupport': {'properties': ['location.range']}}, 'codeLens': {'refreshSupport': True}, 'executeCommand': {'dynamicRegistration': True}, 'didChangeConfiguration': {'dynamicRegistration': True}, 'workspaceFolders': True, 'semanticTokens': {'refreshSupport': True}, 'fileOperations': {'dynamicRegistration': True, 'didCreate': True, 'didRename': True, 'didDelete': True, 'willCreate': True, 'willRename': True, 'willDelete': True}, 'inlineValue': {'refreshSupport': True}, 'inlayHint': {'refreshSupport': True}, 'diagnostics': {'refreshSupport': True}}, 'textDocument': {'publishDiagnostics': {'relatedInformation': True, 'versionSupport': False, 'tagSupport': {'valueSet': [1, 2]}, 'codeDescriptionSupport': True, 'dataSupport': True}, 'synchronization': {'dynamicRegistration': True, 'willSave': True, 'willSaveWaitUntil': True, 'didSave': True}, 'completion': {'dynamicRegistration': True, 'contextSupport': True, 'completionItem': {'snippetSupport': True, 'commitCharactersSupport': True, 'documentationFormat': ['markdown', 'plaintext'], 'deprecatedSupport': True, 'preselectSupport': True, 'tagSupport': {'valueSet': [1]}, 'insertReplaceSupport': True, 'resolveSupport': {'properties': ['documentation', 'detail', 'additionalTextEdits']}, 'insertTextModeSupport': {'valueSet': [1, 2]}, 'labelDetailsSupport': True}, 'insertTextMode': 2, 'completionItemKind': {'valueSet': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]}, 'completionList': {'itemDefaults': ['commitCharacters', 'editRange', 'insertTextFormat', 'insertTextMode']}}, 'hover': {'dynamicRegistration': True, 'contentFormat': ['markdown', 'plaintext']}, 'signatureHelp': {'dynamicRegistration': True, 'signatureInformation': {'documentationFormat': ['markdown', 'plaintext'], 'parameterInformation': {'labelOffsetSupport': True}, 'activeParameterSupport': True}, 'contextSupport': True}, 'definition': {'dynamicRegistration': True, 'linkSupport': True}, 'references': {'dynamicRegistration': True}, 'documentHighlight': {'dynamicRegistration': True}, 'documentSymbol': {'dynamicRegistration': True, 'symbolKind': {'valueSet': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26]}, 'hierarchicalDocumentSymbolSupport': True, 'tagSupport': {'valueSet': [1]}, 'labelSupport': True}, 'codeAction': {'dynamicRegistration': True, 'isPreferredSupport': True, 'disabledSupport': True, 'dataSupport': True, 'resolveSupport': {'properties': ['edit']}, 'codeActionLiteralSupport': {'codeActionKind': {'valueSet': ['', 'quickfix', 'refactor', 'refactor.extract', 'refactor.inline', 'refactor.rewrite', 'source', 'source.organizeImports']}}, 'honorsChangeAnnotations': False}, 'codeLens': {'dynamicRegistration': True}, 'formatting': {'dynamicRegistration': True}, 'rangeFormatting': {'dynamicRegistration': True}, 'onTypeFormatting': {'dynamicRegistration': True}, 'rename': {'dynamicRegistration': True, 'prepareSupport': True, 'prepareSupportDefaultBehavior': 1, 'honorsChangeAnnotations': True}, 'documentLink': {'dynamicRegistration': True, 'tooltipSupport': True}, 'typeDefinition': {'dynamicRegistration': True, 'linkSupport': True}, 'implementation': {'dynamicRegistration': True, 'linkSupport': True}, 'colorProvider': {'dynamicRegistration': True}, 'foldingRange': {'dynamicRegistration': True, 'rangeLimit': 5000, 'lineFoldingOnly': True, 'foldingRangeKind': {'valueSet': ['comment', 'imports', 'region']}, 'foldingRange': {'collapsedText': False}}, 'declaration': {'dynamicRegistration': True, 'linkSupport': True}, 'selectionRange': {'dynamicRegistration': True}, 'callHierarchy': {'dynamicRegistration': True}, 'semanticTokens': {'dynamicRegistration': True, 'tokenTypes': ['namespace', 'type', 'class', 'enum', 'interface', 'struct', 'typeParameter', 'parameter', 'variable', 'property', 'enumMember', 'event', 'function', 'method', 'macro', 'keyword', 'modifier', 'comment', 'string', 'number', 'regexp', 'operator', 'decorator'], 'tokenModifiers': ['declaration', 'definition', 'readonly', 'static', 'deprecated', 'abstract', 'async', 'modification', 'documentation', 'defaultLibrary'], 'formats': ['relative'], 'requests': {'range': True, 'full': {'delta': True}}, 'multilineTokenSupport': False, 'overlappingTokenSupport': False, 'serverCancelSupport': True, 'augmentsSyntaxTokens': True}, 'linkedEditingRange': {'dynamicRegistration': True}, 'typeHierarchy': {'dynamicRegistration': True}, 'inlineValue': {'dynamicRegistration': True}, 'inlayHint': {'dynamicRegistration': True, 'resolveSupport': {'properties': ['tooltip', 'textEdits', 'label.tooltip', 'label.location', 'label.command']}}, 'diagnostic': {'dynamicRegistration': True, 'relatedDocumentSupport': False}}, 'window': {'showMessage': {'messageActionItem': {'additionalPropertiesSupport': True}}, 'showDocument': {'support': True}, 'workDoneProgress': True}, 'general': {'staleRequestSupport': {'cancel': True, 'retryOnContentModified': ['textDocument/semanticTokens/full', 'textDocument/semanticTokens/range', 'textDocument/semanticTokens/full/delta']}, 'regularExpressions': {'engine': 'ECMAScript', 'version': 'ES2020'}, 'markdown': {'parser': 'marked', 'version': '1.1.0'}, 'positionEncodings': ['utf-16']}, 'notebookDocument': {'synchronization': {'dynamicRegistration': True, 'executionSummarySupport': True}}}, 'trace': 'off', 'workspaceFolders': None}}
Traceback (most recent call last):
  File "/usr/local/Caskroom/miniconda/base/envs/2023/lib/python3.11/site-packages/fortls/langserver.py", line 167, in handle
    resp = handler(request)
           ^^^^^^^^^^^^^^^^
  File "/usr/local/Caskroom/miniconda/base/envs/2023/lib/python3.11/site-packages/fortls/langserver.py", line 195, in serve_initialize
    self._resolve_globs_in_paths()
  File "/usr/local/Caskroom/miniconda/base/envs/2023/lib/python3.11/site-packages/fortls/langserver.py", line 1620, in _resolve_globs_in_paths
    source_dirs.update(set(only_dirs(resolve_globs(path, self.root_path))))
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/Caskroom/miniconda/base/envs/2023/lib/python3.11/site-packages/fortls/helper_functions.py", line 337, in resolve_globs
    return [str(p.resolve()) for p in Path(root).glob(rel)]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/Caskroom/miniconda/base/envs/2023/lib/python3.11/site-packages/fortls/helper_functions.py", line 337, in <listcomp>
    return [str(p.resolve()) for p in Path(root).glob(rel)]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/Caskroom/miniconda/base/envs/2023/lib/python3.11/pathlib.py", line 952, in glob
    selector = _make_selector(tuple(pattern_parts), self._flavour)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/Caskroom/miniconda/base/envs/2023/lib/python3.11/pathlib.py", line 282, in _make_selector
    pat = pattern_parts[0]
          ~~~~~~~~~~~~~^^^
IndexError: tuple index out of range

Do you have any suggestions to what I can to to solve the problem?

[gnikit]

Please follow the debug steps mentioned above

[GaffaSnobb]

Thanks for the quick reply. A simple program:

program hello
    integer :: ierr = 99
    write(*,*) ierr
end program hello

Running this fortls --debug_filepath lol.f90 --debug_parser produces

Testing parser
  File = "lol.f90"
  Detected format: free

=========
Parser Output
=========

=== No PreProc ===

program hello !!! PROGRAM - Ln:1
    integer :: ierr = 99 !!! VARIABLE - Ln:2
end program hello !!! END PROGRAM Scope - Ln:4

=========
Object Tree
=========

1: hello
  6: hello::ierr

=========
Exportable Objects
=========

1: hello

I see now that the error does not occur if I add the directory where my file is located to vscode before opening the file. It seems that as long as I have that directory added to the workspace I can open Fortran files located anywhere on my computer without any trouble. If I remove the directory from the workspace and then open any Fortran file with or without restarting vscode, the error is back. Is this expected behavior? I usually never open directories in vscode workspace, I just open files directly from the terminal.

Thanks again : )

[gnikit]

This should be fixed in the pre-release version of the extension.

Is this expected behavior?

Yes and no. When you open just a file in vscode the ${workspaceFolder} is set to $HOME. That means that fortls will parse all files under $HOME to resolve dependencies and track source files. fortls itself has no way of knowing that you want features served on a standalone file instead of a workspace.

We've done some work to get standalone vscode instances to work but given that vscode and fortls are not primarily meant to be used that way one could still face issues.

[GaffaSnobb]

I see! It is not a big problem to add the directory to the workspace so I am happy with that solution. Thank you for the fast replies!

[gnikit]

No worries, glad I could help. If you have any more questions feel free to open a discussion here or go to fortran-lang Discourse channel and use the tag #help:vscode https://fortran-lang.discourse.group/c/help/vscode/