Commit 7d65f21e7e6 Broke Command-t

by ADMIN 35 views

Introduction

Command-T, a popular plugin for Vim, has been a staple for many developers. However, a recent commit, 7d65f21e7e6, has brought the plugin to its knees. In this article, we'll delve into the error message, identify the root cause, and provide a solution to get Command-T up and running again.

The Error Message

The error message is a doozy:

Error detected while processing TextChangedI Autocommands for "<buffer=23>":
Error executing lua callback: ...command-t/lua/wincent/commandt/private/match_listing.lua:88: bad argument #2 to 'len' (number expected, got string)
stack traceback:
        [C]: in function 'len'
        ...command-t/lua/wincent/commandt/private/match_listing.lua:88: in function 'format_line'
        ...command-t/lua/wincent/commandt/private/match_listing.lua:194: in function 'update'                                            
        ...im/plugged/command-t/lua/wincent/commandt/private/ui.lua:127: in function '_on_change'
        ...lugged/command-t/lua/wincent/commandt/private/prompt.lua:95: in function '_on_change'
        ...lugged/command-t/lua/wincent/commandt/private/window.lua:240: in function <...lugged/command-t/lua/wincent/commandt/private/window.lua:236>

Breaking Down the Error Message

Let's take a closer look at the error message. The key part is:

bad argument #2 to 'len' (number expected, got string)

This tells us that the len function is being called with a string argument, but it's expecting a number.

The len Function

The len function is defined as:

local function len(str)
  return vim.str_utfindex(str, 'utf-32')
end

This function takes a string str and returns the UTF-32 index of the string using the vim.str_utfindex function.

The Problem

The problem is that vim.str_utfindex takes two arguments: the string and a numeric index. However, in the len function, we're passing a string as the second argument, which is causing the error.

The Solution

To fix this issue, we simply need to remove the 'utf-32' argument from the vim.str_utfindex function call. The corrected len function should look like this:

local function len(str)
  return vim.str_utfindex(str)
end

By making this change, we're ensuring that the len function is called with the correct arguments, and the error should be resolved.

Conclusion

In this article, we've taken a deep dive into the error message, identified the root cause, and provided a solution to get Command-T up and running again. By understanding the error message and the code that's causing it, we can make targeted changes to fix the issue and get back to work.

Additional Tips

  • When debugging issues like this, it's essential to take a step-by-step approach and break down the error message into smaller parts.
  • Understanding the code that's causing the error is crucial in identifying the root cause and providing a solution.
  • Don't be afraid to ask for help or seek guidance from more experienced developers when faced with complex issues.

Related Articles

Resources

Q: What is Command-T and why is it important?

A: Command-T is a popular plugin for Vim that provides a powerful and efficient way to search for files and buffers within a project. It's an essential tool for many developers, and its recent issues have caused significant disruption.

Q: What is the commit 7d65f21e7e6, and how did it break Command-T?

A: The commit 7d65f21e7e6 is a change to the Command-T plugin that introduced a bug. Specifically, it modified the len function to pass a string argument to the vim.str_utfindex function, which expects a numeric index. This caused the error message we saw earlier.

Q: What is the len function, and why is it important?

A: The len function is a utility function that returns the length of a string. In the context of Command-T, it's used to calculate the length of the search results. The bug in the len function caused the plugin to crash when trying to display the search results.

Q: How can I fix the issue and get Command-T working again?

A: To fix the issue, you need to update the len function to remove the 'utf-32' argument from the vim.str_utfindex function call. The corrected len function should look like this:

local function len(str)
  return vim.str_utfindex(str)
end

Q: What are some best practices for debugging issues like this?

A: When debugging issues like this, it's essential to take a step-by-step approach and break down the error message into smaller parts. Understanding the code that's causing the error is crucial in identifying the root cause and providing a solution. Don't be afraid to ask for help or seek guidance from more experienced developers when faced with complex issues.

Q: How can I prevent similar issues in the future?

A: To prevent similar issues in the future, make sure to:

  • Thoroughly test changes to your code before committing them.
  • Use version control systems like Git to track changes and revert to previous versions if needed.
  • Follow best practices for coding and debugging, such as using clear and concise variable names and commenting your code.

Q: Where can I find more information about Command-T and Vim scripting?

A: For more information about Command-T and Vim scripting, check out the following resources:

Q: Can I get help with debugging my own Vim plugins or scripts?

A: Yes! If you're experiencing issues with your own Vim plugins or scripts, feel free to ask for help in the Vim community or on online forums like Reddit's r/vim.