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#!/usr/bin/lua

require("aports")

-- subcommands -----------------------
subcmd = {}
subcmd.revdep = {
	desc = "Print reverse dependencies",
	usage = "PKG...",
	run = function(opts)
		local i
		local apkdb, rev = aports.init_apkdb(repodirs)
		for i = 2, #opts do
			local pkg = opts[i]
			local _,p
			for _,p in ipairs(rev[pkg] or {}) do
				print(p.pkgname) 
			end
		end
	end
}

subcmd.list = {
	desc = "Print all packages built from aports tree",
	usage = "",
	run = function()
		local apkdb = aports.init_apkdb(repodirs)
		local k,v
		for k,v in pairs(apkdb) do
			print(k)
		end
	end
}

subcmd.recursdeps = {
	desc = "Recursively print all make dependencies for given packages",
	usage = "PKG...",
	run = function (opts)
		local i
		local visited = {}
		local apkdb, rev = aports.init_apkdb(repodirs)
		function recurs(pn)
			if pn == nil or visited[pn] or apkdb[pn] == nil then
				return
			end
			visited[pn] = true
			local i,d, p
			for i,p in ipairs(apkdb[pn]) do
				local _, d
				for _, d in ipairs(p.depends) do
					recurs(d)
				end
				for _, d in ipairs(p.makedepends) do
					recurs(d)
				end
			end
			print(pn)
		end
		for i = 2, #opts do
			recurs(opts[i])
		end
	end
}

subcmd.builddirs = {
	desc = "Print the build dirs for given packages in build order",
	usage = "PKG...",
	run = function(opts)
		local i, p, _
		local visited = {}
		local apkdb, rev = aports.init_apkdb(repodirs)
		local to_print = {}
		function recursdir(pn)
			if pn == nil or visited[pn] or apkdb[pn] == nil then
				return
			end
			visited[pn] = true
			local i, p
			for i,p in pairs(apkdb[pn]) do
				local _, d
				for _, d in pairs(p.depends) do
					recursdir(d)
				end
				for _, d in pairs(p.makedepends) do
					recursdir(d)
				end
				if to_print[p.dir] then
					print(p.dir)
					to_print[p.dir] = nil
				end
			end
		end
		for i = 2, #opts do
			for _,p in pairs(apkdb[opts[i]]) do
				to_print[p.dir] = true
			end
		end
		for i = 2, #opts do
			recursdir(opts[i])
		end
	end
}


function print_usage()
	io.write("usage: ap -d <DIR> SUBCOMMAND [options]\n\nSubcommands are:\n")
	local k,v
	for k in pairs(subcmd) do
		print("  "..k)
	end
end

-- those should be read from some config file
repodirs = {} 


-- parse args
i = 1
opts = {}
help = false
while i <= #arg do
	if arg[i] == "-d" then
		i = i + 1
		repodirs[#repodirs + 1] = arg[i]
	elseif arg[i] == "-h" then
		help = true
	else
		opts[#opts + 1] = arg[i]
	end
	i = i + 1
end

cmd = opts[1]

if cmd == nil then
	print_usage()
	-- usage
	return
end

if subcmd[cmd] and type(subcmd[cmd].run) == "function" then
	subcmd[cmd].run(opts)
else
	io.stderr:write(cmd..": invalid subcommand\n")
end