fix: make PTY width configurable to prevent output truncation

[timblaktu]

Problem

When overseer runs tasks with use_terminal=true (the default), it sets a PTY width of vim.o.columns - 4. This causes compiler output and other program output to be truncated when the Neovim window is narrow (~100 columns or less), as programs detect the terminal width and adjust their output accordingly.

This is especially problematic for compiler error messages that get cut off in the quickfix window, making debugging difficult.

Solution

This PR adds a new pty_width option to the jobstart strategy that allows users to configure the PTY width behavior:

• "auto" (default): Current behavior - uses vim.o.columns - 4
• <number>: Set a fixed width (e.g., 500) to prevent truncation
• nil: Don't specify any width constraint, letting the PTY use its default

Usage Examples

Prevent truncation with a fixed width:

require("overseer").setup({
  strategy = { 
    "jobstart",
    {
      use_terminal = true,
      pty_width = 500,  -- Fixed width prevents truncation
    }
  }
})

Disable width specification entirely:

require("overseer").setup({
  strategy = { 
    "jobstart",
    {
      use_terminal = true,
      pty_width = nil,  -- No width constraint
    }
  }
})

Keep current behavior (default):

require("overseer").setup({
  strategy = { 
    "jobstart",
    {
      use_terminal = true,
      pty_width = "auto",  -- Same as vim.o.columns - 4
    }
  }
})

Testing

Tested with narrow Neovim windows (~100 columns) running C++ compilation with long error messages. With pty_width = 500, error messages are no longer truncated in the quickfix window.

Breaking Changes

None - the default behavior remains unchanged. This is a backward-compatible enhancement.

Related Issues

• Fixes Compiler output truncated when Neovim window is narrow #445 - Compiler output truncated when Neovim window is narrow
• Related to neovim: how to workaround line truncation in neovim terminal (log to file?) #202 - General discussion of line truncation in Neovim terminal buffers

[stevearc]

I'm fine with making the width configurable, but this could be simplified to a 3 or 4 line change. Also, please remove all the unrelated files before we merge.

[stevearc]

This merge strategy won't work as advertised; if you pass in nil it will be overridden by the tbl_extend to be "auto" instead. Also, passing a nil width doesn't mean "no width constraints", it means we will use the default value of the current window width minus the offset due to line numbers etc.

https://github.com/neovim/neovim/blob/5f22cf5af3425fb0d461bf82220a633bebe10932/src/nvim/eval/funcs.c#L3582