Weird Strobing With Vim.snippet.jump + Statusline

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Problem

When jumping between tabstops using vim.snippet.jump, a weird cursor highlight and slow cursor movement are observed. This issue is narrowed down to the interaction between Vim's statusline and the shell call to get the git branch.

Steps to Reproduce

To reproduce this issue, follow these steps:

  1. Open a new Neovim instance with the reproduction.lua file.
  2. Type <C-space><C-y> to trigger snippet completion.
  3. Jump between tabstops using <C-j> and <C-k>.

Expected Behavior

The expected behavior is fluid motion between the tabstops without any weird cursor highlights or slow cursor movement.

Environment

  • Neovim version: NVIM v0.12.0-dev-93+g2d11b981bf
  • Operating system: Windows WSL Ubuntu
  • Terminal: Wezterm
  • $TERM environment variable: screen-256color

Code

The problematic code is located in the get_git_branch_safe function, which is called from the statusline. This function uses the vim.system function to execute a shell command to get the current git branch.

function get_git_branch_safe()
    local command = {"git", "rev-parse", "--abbrev-ref", "HEAD"}

    if not _P.exists_command(command[1]) then
        return "<No git command>"
    end

    local process = vim.system(command, {text=true}):wait()

    if process.code ~= 0 then
        return "<Git command failed>"
    end

    local branch = process.stdout:gsub("\n", "")

    if branch == "" then
        return "<No git branch found>"
    end

    return " " .. branch
end

Analysis

The issue is likely caused by the interaction between the vim.system function and the statusline. The vim.system function is used to execute a shell command to get the current git branch, but this command is not executed quickly enough to prevent the weird cursor highlight and slow cursor movement.

Solution

To fix this issue, we can try the following solutions:

  1. Optimize the get_git_branch_safe function: We can try to optimize the get_git_branch_safe function to execute the shell command more quickly.
  2. Use a different method to get the git branch: We can try to use a different method to get the git branch, such as using the git command directly in Lua.
  3. Disable the statusline: We can try to disable the statusline to see if it is causing the issue.

Conclusion

The weird strobing with vim.snippet.jump and statusline is a complex issue that requires further investigation. By analyzing the code and environment, we can try to identify the root cause of the issue and find a solution to fix it.

Future Work

To further investigate this issue, we can try the following:

  1. Use a debugger: We can use a debugger to step through the code and see where the issue is occurring.
  2. Add logging: We can add logging to the code to see what is happening when the occurs.
  3. Test with different environments: We can test the code with different environments to see if the issue is specific to a particular environment.

Q: What is the weird strobing issue with vim.snippet.jump and statusline?

A: The weird strobing issue is a problem that occurs when using vim.snippet.jump to jump between tabstops in Neovim. When the statusline is enabled, a weird cursor highlight and slow cursor movement are observed.

Q: What causes the weird strobing issue?

A: The issue is caused by the interaction between the vim.system function and the statusline. The vim.system function is used to execute a shell command to get the current git branch, but this command is not executed quickly enough to prevent the weird cursor highlight and slow cursor movement.

Q: How can I reproduce the weird strobing issue?

A: To reproduce the issue, follow these steps:

  1. Open a new Neovim instance with the reproduction.lua file.
  2. Type <C-space><C-y> to trigger snippet completion.
  3. Jump between tabstops using <C-j> and <C-k>.

Q: What are the expected behavior and environment for the weird strobing issue?

A: The expected behavior is fluid motion between the tabstops without any weird cursor highlights or slow cursor movement. The environment is:

  • Neovim version: NVIM v0.12.0-dev-93+g2d11b981bf
  • Operating system: Windows WSL Ubuntu
  • Terminal: Wezterm
  • $TERM environment variable: screen-256color

Q: What are the possible solutions to the weird strobing issue?

A: The possible solutions are:

  1. Optimize the get_git_branch_safe function: We can try to optimize the get_git_branch_safe function to execute the shell command more quickly.
  2. Use a different method to get the git branch: We can try to use a different method to get the git branch, such as using the git command directly in Lua.
  3. Disable the statusline: We can try to disable the statusline to see if it is causing the issue.

Q: How can I further investigate the weird strobing issue?

A: To further investigate the issue, we can try the following:

  1. Use a debugger: We can use a debugger to step through the code and see where the issue is occurring.
  2. Add logging: We can add logging to the code to see what is happening when the occurs.
  3. Test with different environments: We can test the code with different environments to see if the issue is specific to a particular environment.

Q: What is the conclusion of the weird strobing issue?

A: The weird strobing issue is a complex problem that requires further investigation. By analyzing the code and environment, we can try to identify the root cause of the issue and find a solution to fix it.

Q: What are the future work plans for the weird strobing issue?

A: The future work plans are:

  1. Use a debugger: We can use a debugger to step through the code and see where the is occurring.
  2. Add logging: We can add logging to the code to see what is happening when the occurs.
  3. Test with different environments: We can test the code with different environments to see if the issue is specific to a particular environment.