Re: Vim 9 script question

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

https://github.com/seanexplus/vim-unimpaired/commit/f2ef4fa34e01a8b552037c35525a19f15c94826b

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().

https://github.com/seanexplus/vim-unimpaired/commit/fb372df8d17f7e1760ded1d927efcd9e3c629094

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))).

https://github.com/seanexplus/vim-unimpaired/commit/21659e0da4d1acad5a8dbbc100276f426fa2c18f

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.

https://github.com/seanexplus/vim-unimpaired/commit/3bf942ff6f39dd77fcca4ed2090fdfafccbf5312

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.

https://github.com/seanexplus/vim-unimpaired/commit/01ec3e9eb389081b2f01b364c09e2a731949c11a

Salman Halim <salmanhalim@gmail.com> 於 2025年6月11日 晚上8:45 寫道：

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

On Wed, Jun 11, 2025, 08:21 Yu Lang Chiang <seanexplus@gmail.com> wrote:

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

Maxim Kim <habamax@gmail.com> 於 2025年6月11日 上午11:05 寫道：

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>

On Tuesday, June 3, 2025 at 4:45:56 PM UTC+10 Yu Lang Chiang wrote:

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. 

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