nvim-lua.kickstart.nvim/ftplugin/c.lua

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-- local set = vim.opt_local
-- Define a custom command ':intmain' that inserts int main() {} template
vim.api.nvim_create_user_command('IntMain', function()
local current_line = vim.api.nvim_win_get_cursor(0)[1]
local lines = {
'#include <stdio.h>',
'',
'int main ()',
'{',
' ',
' printf();',
' return 0;',
'}',
}
vim.api.nvim_buf_set_lines(0, current_line - 1, current_line - 1, false, lines)
-- Position cursor inside the function body
vim.api.nvim_win_set_cursor(0, { current_line + 1, 4 })
end, {})