-- contrib/sensors_linux.lua
-- Copyright (C) 2010  Greg D. <jabbas@jabbas.pl>
-- Copyright (C) 2017  Jörg Thalheim <joerg@higgsboson.tk>
--
-- This file is part of Vicious.
--
-- Vicious is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as
-- published by the Free Software Foundation, either version 2 of the
-- License, or (at your option) any later version.
--
-- Vicious is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with Vicious.  If not, see <https://www.gnu.org/licenses/>.

-- {{{ Grab environment
local tonumber = tonumber
local io = { popen = io.popen }
local setmetatable = setmetatable
local table = { insert = table.insert }
local string = {
    gsub = string.gsub,
    match = string.match
}
-- }}}


-- Sensors: provides access to lm_sensors data
-- vicious.contrib.sensors
local sensors_linux = {}


-- {{{ Split helper function
local function datasplit(str)
    -- Splitting strings into associative array
    -- with some magic to get the values right.
    str = string.gsub(str, "\n", ":")

    local tbl = {}
    string.gsub(str, "([^:]*)", function (v)
        if string.match(v, ".") then
            table.insert(tbl, v)
        end
    end)

    local assoc = {}
    for c = 1, #tbl, 2 do
        local k  = string.gsub(tbl[c], ".*_", "")
        local v  = tonumber(string.match(tbl[c+1], "[%d]+"))
        assoc[k] = v
    end

    return assoc
end
-- }}}

-- {{{ Sensors widget type
local function worker(format, warg)
    -- Get data from all sensors
    local f = io.popen("LANG=C sensors -uA")
    local lm_sensors = f:read("*all")
    f:close()

    local sensor_data = string.gsub(
        string.match(lm_sensors, warg..":\n(%s%s.-)\n[^ ]"), " ", "")

    -- One of: crit, max
    local divisor = "crit"
    local s_data  =  datasplit(sensor_data)

    if s_data[divisor] and s_data[divisor] > 0 then
        s_data.percent = s_data.input / s_data[divisor] * 100
    end

    return {s_data.input, tonumber(s_data.percent)}
end
-- }}}

return setmetatable(sensors_linux, { __call = function(_, ...) return worker(...) end })