Vim 9 script question

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Yu Lang Chiang

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Jun 3, 2025, 2:45:56 AMJun 3
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Recently I've been trying to learn Vim 9 script by rewriting Vim plugins into Vim 9 script. While attempting to modify *vim-unimpaired*, I discovered that functions related to setting up mappings do not work properly when ported to Vim 9 script. For example, in the `plugin/unimpaired.vim` file, the function `MapNextFamilty` is problematic.

**Original version:**

```vim
execute 'nnoremap <silent> '.prefix.'previous) :<C-U>exe "'.cmd.'previous'.end
execute 'nnoremap <silent> '.prefix.'next)     :<C-U>exe "'.cmd.'next'.end
execute 'nnoremap '.prefix.'first)    :<C-U><C-R>=v:count ? v:count . "' . a:current . '" : "' . a:cmd . 'first"<CR><CR>' . zv
execute 'nnoremap '.prefix.'last)     :<C-U><C-R>=v:count ? v:count . "' . a:current . '" : "' . a:cmd . 'last"<CR><CR>' . zv
execute 'nnoremap <silent> '.map.'Previous :<C-U>exe "'.cmd.'previous'.end
execute 'nnoremap <silent> '.map.'Next     :<C-U>exe "'.cmd.'next'.end
execute 'nnoremap <silent> '.map.'First    :<C-U>exe "'.cmd.'first'.end
execute 'nnoremap <silent> '.map.'Last     a:<C-U>exe "'.cmd.'last'.end
```

**Vim 9 script version:**

```vim
execute 'nnoremap <silent> ' .. prefix .. 'previous) :<C-U>exe "' .. tcmd .. 'previous' .. end
execute 'nnoremap <silent> ' .. prefix .. 'next)     :<C-U>exe "' .. tcmd .. 'next' .. end
execute 'nnoremap ' .. prefix .. 'first)    :<C-U><C-R>=v:count ? v:count . "' .. current .. '" : "' .. cmd .. 'first"<CR><CR>' .. zv
execute 'nnoremap ' .. prefix .. 'last)     :<C-U><C-R>=v:count ? v:count . "' .. current .. '" : "' .. cmd .. 'last"<CR><CR>' .. zv
execute 'nnoremap <silent> ' .. tmap .. 'Previous :<C-U>exe "' .. tcmd .. 'previous' .. end
execute 'nnoremap <silent> ' .. tmap .. 'Next     :<C-U>exe "' .. tcmd .. 'next' .. end
execute 'nnoremap <silent> ' .. tmap .. 'First    :<C-U>exe "' .. tcmd .. 'first' .. end
execute 'nnoremap <silent> ' .. tmap .. 'Last     :<C-U>exe "' .. tcmd .. 'last' .. end
```

When inspecting the mappings using:

```vim
echo maparg('<Plug>('unimpaired-commmand')', 'n')
```

you find that both versions produce identical mappings. For example:

- **Original version:**

  ```
  :<C-U>exe "".(v.count ? v:count : "")."bprevious"<CR>
  ```

- **Vim 9 script version:**

  ```
  :<C-U>exe "".(v.count ? v:count : "")."bprevious"<CR>
  ```

Despite the mappings appearing the same, the one defined in the Vim 9 script version does not work. Even after removing `<silent>`, no error messages are reported. Any advice?

**Test Environment:**

- **OS:** Fedora Linux 42 (x86-64)
- **Vim:** 9.1.1418

My repository is https://github.com/seanexplus/vim-unimpaired/tree/master . All vim 9 script rewriting is in vim-9-test branch.

Maxim Kim

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Jun 10, 2025, 11:05:08 PMJun 10
to vim_use
vim9script enforces spaces between operators,  your mappings are defined in vim9script context so it expects spaces between concatenation operator .

:<C-U>exe "" . (v.count ? v:count : "") . "bprevious"<CR>

Yu Lang Chiang

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Jun 11, 2025, 8:21:19 AMJun 11
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I tried the following combinations:

<C-U>exe "" . (v.count ? v:count : "") . "bprevious"<CR>
<C-U>exe "” .. (v.count ? v:count : "") .. "bprevious"<CR>
<C-U>execute "” .. (v.count ? v:count : "") .. "bprevious"<CR>
<C-U>execute "” . (v.count ? v:count : "") . "bprevious"<CR>


None of them work.

Vim has been updated to version 9.1.1435

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Salman Halim

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Jun 11, 2025, 8:45:51 AMJun 11
to Vim Users
Use .. in Vim 9 (mappings 2 and 3 below). Also, you have v.count and v:count. They probably aren't both correct (all of them have that). 

What happens when you just type the whole thing on the command line directly?

Salman

Yu Lang Chiang

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Jun 12, 2025, 5:16:45 AMJun 12
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I've identified that the root cause was in another part of the code, and it's now resolved. Thank you all for your assistance.

Salman Halim <salma...@gmail.com> 於 2025年6月11日 週三 下午8:45寫道：

Eric Marceau

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Jun 13, 2025, 3:59:48 PMJun 13
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Hello Lang Chiang,

Good to hear your problem is solved!

Could you share with all of us 

  • exactly where the problem's root cause was, and
  • the how of way it was resolved?

I am sure that would benefit many of us.

Thank you,


Eric

Yu Lang Chiang

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Jun 14, 2025, 10:00:14 AMJun 14
to vim...@googlegroups.com

I found that I had mistakenly removed execute from all Map(.....) portions, causing them to fail to map to actual keys.

I've now completed testing and fixing most of the functionality. During this process, I learned:

Some Vim script patterns that use strings to define actions must be converted to lambda syntax in Vim 9 script, such as filter() and substitute().

When using substitute() in Vim 9 script, if the lambda includes expressions like nr2char(submatch(1)), it must be rewritten as nr2char(str2nr(submatch(1))).

In Vim script, you can simply use +/- to move to the next/previous line, but in Vim 9 script you must use the cursor() function.

In Vim script, you can operate on registers using @@, but in Vim 9 script you have to use setreg()/getreg().
In Vim script, you can use {funcname}(param) to call function by name, but in Vim 9 script you have to use function(funcname)(param)
Where <sfile> is used in Vim script, <script>/<stack> must be used in Vim 9 script.

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