How to uncomment several lines when some of these lines are not comments?

[gaoqiangks]

For example, I have three lines, the first and the third are comments, while the second is not.

# a=1
b=2
# c=3

When visually select these three lines and type gc, it will become

## a=1
#b=2
## c=3

I want it to become

a=1
b=2
c=3

[Drayux]

I ran into this myself...I couldn't find much in the world of configuration to do this trivially. That said, I did a bit of silly business in my personal config that pulls in from the utils portion of the plugin.

local uncommentLine = function()
	local utils = require("Comment.utils")
	local mode = vim.api.nvim_get_mode().mode

	-- Leave visual mode if active
	if mode == "v" or mode == "V" then
		local escapeKey = vim.api.nvim_replace_termcodes("<esc>", true, false, true)
		vim.api.nvim_feedkeys(escapeKey, "nx", false)
	else
		mode = "line" -- Convert to Comment.nvim's expected format
	end

	local range = utils.get_region(mode)
	local lines = utils.get_lines(range)

	-- Recreate internal API to construct the "comment context"
	-- > https://github.com/numToStr/Comment.nvim/blob/master/lua/Comment/opfunc.lua#L46
	local left_cs, right_cs = utils.parse_cstr({}, {
		cmode = utils.cmode.uncomment,
		cmotion = "line",
		ctype = utils.ctype.linewise,
		range = range,
	})

	-- Closures to perform the uncomment operation
	-- > Boolean params enable padding
	local check = utils.is_commented(left_cs, right_cs, true)
	local uncomment = utils.uncommenter(left_cs, right_cs, true)
	local changes = false
	for idx, line in pairs(lines) do
		if check(line) then
			lines[idx] = uncomment(line)
			changes = true
		end
	end

	-- TODO: Currently, nvim_buf_set_lines has a bug where all marks that are
	-- > within the changed content region are cleared
	-- > Currently only in the nightly builds is the vim._with function, which
	-- > should resolve this bug
	-- > https://github.com/neovim/neovim/pull/29168

	-- Call nvim api to update the buffer
	-- vim._with({ lockmarks = true }, function()
		if changes then
			vim.api.nvim_buf_set_lines(0, range.srow - 1, range.erow, false, lines)
		else
			vim.notify("Nothing to uncomment!", vim.log.levels.WARN)
		end
	-- end)

	-- Re-enter previous visual mode selection
	-- if mode == "v" or mode == "V" then
		-- vim.api.nvim_feedkeys("gv", "nx", false)
	-- end
end

And then I bound this as it's own keymap (in the same file)
vim.keymap.set({ "n", "v" }, "<leader>C", uncommentLine, { expr = true })

I pulled this straight from my config so forgive the silly todo comments :)