Creating a new Clojure file with æ/ø/å in the filename breaks `workspace/willRenameFiles`

[Magnar Sveen]

Describe the bug

Saving a new file with characters from a non-US alphabet will throw an "Internal Error", in Emacs preventing the buffer from being marked as saved. The current workaround I have found is to save the file in fundamental-mode. Once it exists, lsp no longer throws.

To Reproduce

1. Create a new file in an lsp-enabled Clojure project, call it something quirky, like kåre.clj
2. Try saving the file.
3. See "Internal Error"

Expected behavior

I was hoping to save my file without workarounds. 😅

User details:

• OS: Emacs on MacOS

• Version:

  clojure-lsp 2024.04.22-11.58.08-nightly
  clj-kondo 2024.03.13

Additional context

Toggling on debug-on-error in Emacs shows this stack:

Debugger entered--Lisp error: (error "Internal error")
  signal(error ("Internal error"))
  error("Internal error")
  lsp-request("workspace/willRenameFiles" #<hash-table equal 1/65 0x47ec724d>)
  lsp--on-rename-file(#<subr rename-file> "/Users/magnars/work/parenteser/src/parenteser/kåre..." "/Users/magnars/.emacs.d/backups/!Users!magnars!wor..." t)
  apply(lsp--on-rename-file #<subr rename-file> ("/Users/magnars/work/parenteser/src/parenteser/kåre..." "/Users/magnars/.emacs.d/backups/!Users!magnars!wor..." t))
  rename-file("/Users/magnars/work/parenteser/src/parenteser/kåre..." "/Users/magnars/.emacs.d/backups/!Users!magnars!wor..." t)
  backup-buffer()
  basic-save-buffer-2()
  basic-save-buffer-1()
  basic-save-buffer(t)
  save-buffer(1)
  funcall-interactively(save-buffer 1)
  call-interactively(save-buffer nil nil)
  command-execute(save-buffer)

Looking at the stack trace, here's what happens:

• Emacs keeps a backup of the file somewhere while it is unsaved.
• When saving, it triggers a rename-file which in turn triggers the lsp-mode rename-file hook
• This performs the workspace/willRenameFiles

This works as expected with regular characters, but breaks with æ/ø/å and presumably other non-US alphabet chars.

So, the problem is actually renaming files with strange chars. Due to the way Emacs handles new files, this leaks into saving any new files with strange chars.

[Magnar Sveen]

Having tried (naively) to reproduce it it clojure-lsp's test suite, it might come down to this:

(shared/uri->filename "file:///user/project/src/my/kåre.clj")

1. Unhandled java.lang.IllegalArgumentException
   Bad escape

         UnixUriUtils.java:   88  sun.nio.fs.UnixUriUtils/fromUri
UnixFileSystemProvider.java:  125  sun.nio.fs.UnixFileSystemProvider/getPath
                 Path.java:  204  java.nio.file.Path/of
                Paths.java:   98  java.nio.file.Paths/get
                shared.clj:  179  clojure-lsp.shared/uri-obj->filepath
                shared.clj:  177  clojure-lsp.shared/uri-obj->filepath
                shared.clj:  223  clojure-lsp.shared/uri->filename
                shared.clj:  202  clojure-lsp.shared/uri->filename
                      REPL:  349  clojure-lsp.feature.file-management-test/eval60866

I'm not sure if this is me missing a step on the way where maybe the "Bad escape" would be fixed, tho.