util.lua

-- SPDX-License-Identifier: GPL-2.0
-- Copyright 2022-2024 - Fábio Rodrigues Ribeiro and contributors

local function getoutput(cmd)
	local handle = assert(io.popen(cmd))
	if not handle then error(("Erro ao chamar o comando: %s."):format(cmd)) end
	local result = handle:read "*l"
	handle:close()
	if not result or result == "" then return nil, "Command output is empty" end
	return result
end

local function getoutput_all(cmd)
	local handle = assert(io.popen(cmd))
	if not handle then error(("Erro ao chamar o comando: %s."):format(cmd)) end
	local result = handle:read "*a"
	handle:close()
	if not result or result == "" then return nil, "Command output is empty" end
	return result
end

local function open_file (filename, opts)
    local f = assert(io.open(filename, opts))
    if not f then error(("Erro ao abrir o arquivo %s para leitura."):format(filename)) else return f end
end

local function open_iter (filename)
    local f = open_file (filename, "r")

    return
        function ()
            f:seek("set", 0) -- volta pro início
            local line = f and f:read "*a"
            if not line then
                f:close()
                f = nil
            end
            return line
        end
end

function openfile_match (filename, string)
  local result
  for line in open_iter(filename) do
    result = line:match(string)
    if result then break end
  end
  return result
end

local function xargs()
	local opts = ""
	for i = 2, #arg do opts = ("%s %s"):format(opts, arg[i]) end
	return opts
end

local function sbversion() return getoutput "rpm -E %fedora" end
local function arch() return getoutput "uname -m" end
local function writecmd_x(cmd) io.write(cmd .. "\n") x(cmd) end
local function writemsg_x(cmd, msg) io.write(msg) x(cmd) end
local function x_writemsg(cmd, msg) x(cmd) io.write(msg) end

return {
	sbversion = sbversion,
	arch = arch,
	writecmd_x = writecmd_x,
	writemsg_x = writemsg_x,
	x_writemsg = x_writemsg,
	openfile_match = openfile_match,
	xargs = xargs,
	open_file = open_file,
	getoutput_all = getoutput_all,
	getoutput = getoutput
}