btc: remove synchronous variant and dead code

contrib/btc_all.lua

@@ -18,11 +18,11 @@ local string = {
 
 -- Btc: provides current bitcoin price
 -- vicious.widgets.btc
-local btc_linux = {}
+local btc_all = {}
 
 
 -- {{ Bitcoin widget type
-function btc_linux.async(format, warg, callback)
+function btc_all.async(format, warg, callback)
     -- Default values
     if not warg then warg = "usd" end
 
@@ -48,10 +48,4 @@ function btc_linux.async(format, warg, callback)
 end
 -- }}}
 
--- {{ Bitcoin widget type
-local function worker(format, warg)
-    btc_linux.async(format, warg, function(data) return data end)
-end
--- }}}
-
-return setmetatable(btc_linux, { __call = function(_, ...) return worker(...) end })
+return btc_all

contrib/btc_linux.lua

@@ -1,57 +0,0 @@
----------------------------------------------------
--- Licensed under the GNU General Public License v2
---  * (c) 2017, 0x5b <dragen15051@gmail.com>
----------------------------------------------------
-
--- {{{ Grab environment
-local setmetatable = setmetatable
-local pcall = pcall
-local helpers = require("vicious.helpers")
-local spawn = require("awful.spawn")
-local json = require("json")
-local string = {
-    sub = string.sub,
-    upper = string.upper,
-}
--- }}}
-
-
--- Btc: provides current bitcoin price
--- vicious.widgets.btc
-local btc_linux = {}
-
-
--- {{ Bitcoin widget type
-function btc_linux.async(format, warg, callback)
-    -- Default values
-    if not warg then warg = "usd" end
-
-    local btc = { ["{price}"] = "N/A" }
-    local currency_code = string.upper(warg)
-    local url = "https://api.coindesk.com/v1/bpi/currentprice/" .. currency_code .. ".json"
-    local cmd = "curl "..helpers.shellquote(url)
-
-    -- {{ Checking response
-    local function parse(response)
-        -- If 'response' is not json, 'json.decode' will return Error
-        local status, data = pcall(function() return json.decode(response) end)
-        if not status or not data then
-            return btc
-        end
-
-        btc["{price}"] = string.sub(data["bpi"][currency_code]["rate"], 0, -3)
-        return btc
-    end
-    -- }}
-
-    spawn.easy_async(cmd, function(stdout) callback(parse(stdout)) end)
-end
--- }}}
-
--- {{ Bitcoin widget type
-local function worker(format, warg)
-    btc_linux.async(format, warg, function(data) return data end)
-end
--- }}}
-
-return setmetatable(btc_linux, { __call = function(_, ...) return worker(...) end })