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-- trimet transit tracker
-- 7536 = 75 southbound @42nd and sumner
-- 11503 = MAX Yellowline southbound @Killingsworth and Interstate.
-- (C) 2013 Donald Delmar Davis, Suspect Devices.
-- THIS IS FREE SOFTWARE, released under Modified BSD (look it up)
http = require("socket.http")
checktime=0
estimates={}
scheduled={}
-- I want to do a list comprehension here
current_platform = io.popen("uname -m"):read("*l")
if current_platform == 'i386' then
io_output = io.stdout
elseif current_platform == 'x86_64' then
io_output = io.stdout
else
io_output = '/dev/ttyATH0'
end
io.output(io_output)
-- still trying to figure this out.
-- from http://lua-users.org/wiki/FiltersSourcesAndSinks
function mysink(chunk,src_err)
local mycontent=""
if chunk == nil then
if src_err then
-- source reports an error
else
-- do something with concatenation of chunks
end
return true
elseif chunk == "" then
return true
else
mycontent=chunk
-- print(mycontent)
checktime=string.match(mycontent,'queryTime="(%d+)')
print (os.date("%d %b %X", string.sub(checktime,1,10)))
io.write("\254\001",os.date("%d %b %X", string.sub(checktime,1,10)),"\254\192")
i=0
while true do
i,j=string.find(mycontent,"<arrival",i)
if i==nil then
break
else
i=i+1;
end
arrival=string.sub(mycontent,i,string.find(mycontent,">",j))
--print(arrival)
status=string.match(arrival,'status="(%a+)')
--print(status)
local thetime=0
local marker="~"
local minutes_till = ''
if string.find(status,'estimated') then
marker=""
thetime=string.match(arrival,'estimated="(%d+)')
else
thetime=string.match(arrival,'scheduled="(%d+)')
end
thetime = string.sub(thetime,1,10)
local timerep=os.date("%c", thetime )
print(status.."("..thetime..")="..timerep )
local delta = (os.difftime(thetime, os.time()) / 60)
print("delta: "..delta)
if delta > 60 then
marker = ''
minutes_till = '(z_z)'
elseif delta < 1 then
minutes_till = 'Due'
else
minutes_till = string.format("%.0f min", delta)
end
print("minutes_till: "..minutes_till)
io.write(marker .. minutes_till .." ")
end
return true
end
-- in case of error
return nil, err
end
--- Delay for a number of seconds.
-- @param delay Number of seconds
function delay_s(delay)
delay = delay or 1
local time_to = os.time() + delay
while os.time() < time_to do end
end
while true do
http.request{
url="http://developer.trimet.org/ws/V1/arrivals?locIDs=11503&appID=EC36A740E55BB5A803BB2602B";
sink=mysink;
}
io.flush()
delay_s(7)
end
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