A clink script for supporting tab-completion of git branches when using "git checkout"

git checkout master

function git_checkout_match_generator(text, first, last)
	found_matches = false;
	if rl_state.line_buffer:find("^git checkout ") then
		has_start_branch = not rl_state.line_buffer:find("^git checkout[ ]*$")
		for line in io.popen("git branch 2>nul"):lines() do
			local m = line:match("[%* ] (.+)$")
			
			if m then
				if not has_start_branch then
					clink.add_match(m)
					found_matches = true;
				elseif #text > 0 and m:find(text) then
					clink.add_match(m)
					found_matches = true;
				end
			end
		end
	end
 
    return found_matches
end
 
clink.register_match_generator(git_checkout_match_generator, 10)