A clink script for supporting tab-completion of git branches when using "git checkout", and showing branch name.

clink_git.lua

-- [[
--	Git config for clink
--	A clink script for supporting tab-completion of git branches when using
--	"git checkout", and showing branch name.
-- ]]

function git_checkout_match_generator(text, first, last)
	found_matches = false;
	local line_buffer = rl_state.line_buffer
	if line_buffer:find("^git checkout ") or
		line_buffer:find("^git co ") then
		local lines = io.popen("git branch 2>nul"):lines()
		for line in lines do
			local m = line:match("[%* ] (.+)$")
			if m then
				has_start_branch =
					not line_buffer:find("^git checkout[ ]*$") and
					not line_buffer:find("^git co[ ]*$")
				if (not has_start_branch) or
					(#text > 0 and m:find(text)) then
					clink.add_match(m)
					found_matches = true;
				end
			end
		end
	end
	return found_matches
end

function git_prompt_filter()
	local lines = io.popen("git branch 2>nul"):lines()
	for line in lines do
		local m = line:match("%* (.+)$")
		if m then
			clink.prompt.value = clink.prompt.value.." ["..m.."] "
			break
		end
	end
	return false
end

clink.register_match_generator(git_checkout_match_generator, 10)
clink.prompt.register_filter(git_prompt_filter, 10)