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

git_aliases.lua

-- git commands which will autocomplete branch names after them:
local git_commands = {"co", "merge", "del"}
-- "g" is an alias I have for "git" so both of them are triggers
local git_triggers = {"g", "git"}

function git_checkout_match_generator(text, first, last)
	local commandLine = rl_state.line_buffer
	local matchedCommand = false
	local matchedBranches = false

	for _,command in pairs(git_commands) do
		for _,trigger in pairs(git_triggers) do
			if commandLine:find(trigger .. " " .. command .. " ", 1, true) then
				matchedCommand = true
				break
			end
		end
	end

	if matchedCommand then
		-- get all branches and remove "HEAD" and "remotes/origin/"
		for line in io.popen("git branch -a 2>nul"):lines() do
			local branch = line:match("[%* ] (.+)$")
			if not branch:find("HEAD", 1, true) then
				branch = string.gsub(branch, "remotes/origin/", "")
				if branch:find(text, 1, true) then
					matchedBranches = true
					clink.add_match(branch)
				end
			end
		end
	end

	return matchedBranches
end

clink.register_match_generator(git_checkout_match_generator, 10)