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[etc/awesome.git] / widgets / contrib / ccurr.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2014, Aaron Lebo                      
6                                                   
7 --]]
8
9 local newtimer = require("lain.helpers").newtimer
10 local json     = require("lain.util").dkjson
11
12 local wibox    = require("wibox")
13
14 local string   = { format = string.format }
15 local tonumber = tonumber
16
17 -- Crypto currencies widget
18 -- lain.widgets.contrib.ccurr
19 local ccurr = {}
20
21 -- Currently gets
22 --   * BTC/USD
23 --   * DOGE/USD
24 -- using Coinbase and Cryptsy APIs.
25
26 -- requires   http://dkolf.de/src/dkjson-lua.fsl/home
27 -- based upon http://awesome.naquadah.org/wiki/Bitcoin_Price_Widget
28
29 local function get(url)
30     local f = io.popen('curl -m 5 -s "' .. url .. '"')
31     if not f then
32         return 0
33     else
34         local s = f:read("*all")
35         f:close()
36         return s
37     end
38 end
39
40 local function parse(j)
41     local obj, pos, err = json.decode(j, 1, nil)
42     if err then
43         return nil
44     else
45         return obj
46     end
47 end
48
49 local function worker(args)
50     local args     = args or {}
51     local timeout  = args.timeout  or 600
52     local btc_url  = args.btc_url  or "https://coinbase.com/api/v1/prices/buy"
53     local doge_url = args.doge_url or "http://pubapi.cryptsy.com/api.php?method=singlemarketdata&marketid=132"
54     local settings = args.settings or function() end
55
56     ccurr.widget = wibox.widget.textbox('')
57
58     local function update()
59         price_now = {
60             btc  = "N/A",
61             doge = "N/A"
62         }
63
64         btc  = parse(get(btc_url))
65         doge = parse(get(doge_url))
66
67         if btc and doge then
68             price_now.btc  = tonumber(btc["subtotal"]["amount"])
69             price_now.doge = tonumber(doge["return"]["markets"]["DOGE"]["lasttradeprice"])
70             price_now.doge = string.format("%.4f", price_now.btc * price_now.doge)
71         end
72
73         widget = ccurr.widget
74         settings()
75     end
76
77     newtimer("ccurr", timeout, update)
78
79     return ccurr.widget
80 end
81
82 return setmetatable(ccurr, { __call = function(_, ...) return worker(...) end })