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fix(render): handle large messages when calculating line width #283

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@flrgh flrgh commented Jun 20, 2024

Some misbehaving plugin code was sending very large messages to vim.notify(), which would trigger an exception when calculating the max line width for rendering:

[...]/notify/render/default.lua:6: too many results to unpack

To fix this, I updated the implementation to calculate the max line width in-place. This ultimately ends up being much more efficient because it is not creating a new table with vim.tbl_map().

Here's some benchmark data:
https://gist.github.com/flrgh/349aecd8ca35d20cf0526ec8b218657c

In the large input benchmarks, the new function is ~2x faster. For small inputs (which are probably most common for vim.notify()), the speedup is even larger at 3-4x.

Other changes:

  1. I noticed the same snippet appeared in multiple render modules, so I factored it out into notify.util.max_line_width() and added a unit test
  2. I updated the calculation to use vim.api.nvim_strwidth() when available (see fix: improve string width calculation #247).

Some misbehaving plugin code was sending very large messages to
`vim.notify()`, which would trigger an exception when calculating the
max line width for rendering:

```
[...]/notify/render/default.lua:6: too many results to unpack
```

To fix this, I updated the implementation to calculate the max line
width in-place. This ultimately ends up being much more efficient because
it is not creating a new table with `vim.tbl_map()`.

Here's some benchmark data:
https://gist.github.com/flrgh/349aecd8ca35d20cf0526ec8b218657c

In the large input benchmarks, the new function is ~2x faster. For small
inputs (which are probably most common for `vim.notify()`), the speedup
is even larger at 3-4x.

Other changes:

  1. I noticed the same snippet appeared in multiple render modules, so
     I factored it out into `notify.util.max_line_width()` and added a
     unit test
  2. I updated the calculation to use `vim.api.nvim_strwidth()` when
     available (see rcarriga#247).
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