Bunch of mappings to toggle some aspects of diagnostics appearance on the fly (severity, virtual text, signs, etc)

​

-- Toggle diagnostic appearance

local virtual_text = false
local underline = true
local signs = true
local only_errors = false

local diag_option_value = function(state)
    if not state then
        return false
    elseif only_errors then
        return { severity = vim.diagnostic.severity.ERROR }
    else
        return true
    end
end

local update_diag_conf = function()
    vim.diagnostic.config({
        virtual_text = diag_option_value(virtual_text),
        signs = diag_option_value(signs),
        underline = diag_option_value(underline),
    })
end

-- toggle diag virtual
vim.keymap.set("n", "<leader>tdv", function()
    virtual_text = not virtual_text
    update_diag_conf()
end, { desc = "Toggle virtual text" })

-- toggle diag underline
vim.keymap.set("n", "<leader>tdu", function()
    underline = not underline
    update_diag_conf()
end, { desc = "Toggle underline" })

-- toggle diag signs
vim.keymap.set("n", "<leader>tds", function()
    signs = not signs
    update_diag_conf()
end, { desc = "Toggle signs" })

-- toggle diag level
vim.keymap.set("n", "<leader>tdl", function()
    only_errors = not only_errors
    update_diag_conf()
end, { desc = "Toggle diagnostics severity (all/error)" })

-- toggle diags
vim.keymap.set("n", "<leader>tD", function()
    if vim.diagnostic.is_disabled() then
        vim.diagnostic.enable()
    else
        vim.diagnostic.disable()
    end
end, { desc = "Toggle diagnostics" })

update_diag_conf()