https://github.com/taku-o/vim-catn

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Insert formatted text with number at selected area.
You can select "text format", "starting number", and "insert area".

Default value of option are
text format     : "%d "
starting number : 1
insert area     : current line only

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[command format]

:'<,'>Catn {text format} {starting number}

:'<,'>Catn [{starting number}]

({text format} ... see ":help printf()", available format is written there.)

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[command example]

(Insert number at selected area. 1, 2, 3, ....)
:'<,'>Catn

(Insert number at selected area. 1000, 1001, 1002, ....)
:'<,'>Catn 1000

(Insert formatted number text at selected area. 0000500, 0000501, 0000502, ....)
:'<,'>Catn %08d\  500

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1. Copy the catn.vim script to
   $HOME/vimfiles/plugin or $HOME/.vim/plugin directory.
   Refer to ':help add-plugin', ':help add-global-plugin' and
   ':help runtimepath' for more details about Vim plugins.

2. Restart Vim.