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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