nvim-config-kickstart/after/plugin/mappings.lua

--[[
-- Contains fixes for mappings created by plugins
--]]

-- Comments.nvim adds `gbc` command, which conflicts with `gb/gé` to move
-- between tabs
if vim.fn.maparg("gbc") ~= "" then
  vim.keymap.del("n", "gbc")
  vim.keymap.set('n', 'gBc', function()
                return vim.api.nvim_get_vvar('count') == 0 and '<Plug>(comment_toggle_blockwise_current)'
                    or '<Plug>(comment_toggle_blockwise_count)'
            end, { expr = true, desc = 'Comment toggle current block' })
end

-- [[ vimtex ]]
-- Some BÉPO mappings for vimtex
local texgroup = vim.api.nvim_create_augroup("latex", { clear = true })

vim.api.nvim_create_autocmd({"BufEnter", "BufWinEnter"}, {
  pattern = {"*.tex", "*.bib", "*.cls", "*.tikz", },
  group = texgroup,
  callback = function()
    local vimtex_remaps = {
      -- c <-> t
      { mode = "n", source = "csd", target = "tsd", command = "<Plug>(vimtex-delim-change-math)"},
      { mode = "n", source = "csc", target = "lsc", command = "<Plug>(vimtex-cmd-change)"},
      { mode = "n", source = "cse", target = "lse", command = "<Plug>(vimtex-env-change)"},
      { mode = "n", source = "cs$", target = "ls$", command = "<Plug>(vimtex-env-change-math))"},
      -- t <-> j
      { mode = {"x", "n"}, source = "tsD", target = "jsD", command = "<Plug>(vimtex-delim-toggle-modifier-reverse)"},
      { mode = {"x", "n"}, source = "tsd", target = "jsd", command = "<Plug>(vimtex-delim-toggle-modifier)"},
      { mode = {"x", "n"}, source = "tsf", target = "jsf", command = "<Plug>(vimtex-cmd-toggle-frac)"},
      { mode = "n", source = "tsc", target = "jsc", command = "<Plug>(vimtex-cmd-toggle-star)"},
      { mode = "n", source = "ts$", target = "js$", command = "<Plug>(vimtex-env-toggle-math)"},
      { mode = "n", source = "tse", target = "jse", command = "<Plug>(vimtex-env-toggle-star)"},
    }

    for _,remap in pairs(vimtex_remaps) do
      if vim.fn.maparg(remap.source) ~= "" then
        vim.keymap.del(remap.mode, remap.source, { buffer = true })
        vim.keymap.set(remap.mode, remap.target, remap.command, { silent = true, noremap = true, buffer = true})
      end
    end
  end,
})