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--[[--
remind(1) compatible formatting.
--]]--
local inspect = require "ext.inspect"
local pcall = pcall
local io = require "io"
local iostdout = io.stdout
local math = require "math"
local mathfloor = math.floor
local os = os
local osdate = os.date
local ostime = os.time
local string = require "string"
local stringformat = string.format
local stringsub = string.sub
local table = require "table"
local tableconcat = table.concat
local common = require "common"
local println = common.println
local errorln = common.errorln
local noiseln = common.noiseln
local debugln = common.debugln
local seconds_of_time = function (t)
return t % 60
end
local minutes_of_time = function (t)
return mathfloor (t / 60) % 60
end
local hours_of_time = function (t)
return mathfloor (t / (60 * 60)) % 60
end
local days_of_time = function (t)
return mathfloor (t / (24 * 60 * 60))
end
local get_param = function (params, name)
local np = #params
for i = 1, np do
local param = params [i]
if param.name == name then return param end
end
return nil
end
local get_param_value = function (params, name)
local param = get_param (params, name)
if param ~= nil then return param.value end
return nil
end
local get_param_value_1 = function (params, name)
local val = get_param_value (params, name)
if val ~= nil then
return val [1]
end
return nil
end
local rem_of_vcalendars do
local f_sec = 1
local f_min = 60 * f_sec
local f_hour = 60 * f_min
local f_day = 24 * f_hour
local l_month = { [00] = 0
, [01] = 31
, [02] = 30
, [03] = 31
, [04] = 30
, [05] = 31
, [06] = 30
, [07] = 31
, [08] = 31
, [09] = 30
, [10] = 31
, [11] = 30
, [12] = 31
}
local time_of_month = function (m, y)
local r = 0
for i = 0, m - 1 do
local f = l_month [i]
if i == 2 and y % 4 == 0 and y % 100 ~= 0 then
f = f + 1
end
r = r + f * f_day
end
return r
end
local time_of_year = function (y)
if y % 4 == 0 and y % 100 ~= 0 then
end
end
--[[--
Date format “%Y%M%D”
--]]--
local parse_date_value_DATE = function (st, tzid)
local Y = tonumber (stringsub (st, 1, 4))
local M = tonumber (stringsub (st, 5, 6))
local D = tonumber (stringsub (st, 7, 8))
return ostime { year = Y, month = M, day = D }
end
--[[--
Date format 1 date with local time: “%Y%M%DT%h%m%s”
Date format 2 date with local time: “%Y%M%DT%h%m%sZ%z”
Date format 3 date with local time: “%Y%M%DT%h%m%s” with TZID parm
--]]--
local parse_date_value_DATE_TIME = function (st, tzid)
if #st < 15 then
error (stringformat ("date-time specification [%s] is rubbish", st))
end
local Y = tonumber (stringsub (st, 1, 4))
local M = tonumber (stringsub (st, 5, 6))
local D = tonumber (stringsub (st, 7, 8))
assert (stringsub (st, 9, 9) == "T")
local h = tonumber (stringsub (st, 10, 11))
local m = tonumber (stringsub (st, 12, 13))
local s = tonumber (stringsub (st, 14, 15))
local t = { year = Y
, month = M
, day = D
, hour = h
, min = m
, sec = s
, isdst = false
}
if #st == 15 then
--- format 3 (with time zone reference)
if tzid then
error (stringformat ("timezone specification (TZID) for dates \z
not implemented, sorry"))
end
--- format 1 (local)
return ostime (t), true
end
--- format 2 (UTC)
assert (stringsub (st, 16, 16) == "Z",
stringformat ("rubbish date-time specification %s", st))
return ostime (t), false
end
--[[--
if params lack a VALUE entry, DATE-TIME is assumed
--]]--
local parse_date_value = function (val)
local params = val.params
local ptzid = get_param_value_1 (params, "TZID")
local pdate = get_param_value_1 (params, "VALUE")
if pdate == nil or pdate == "DATE-TIME" then
return parse_date_value_DATE_TIME (val.value, ptzid)
end
if pdate == "DATE" then
return parse_date_value_DATE (val.value, ptzid), false
end
return nil
end
local rem_date = function (d, loctime)
if loctime == true then
return osdate ("%b %d %Y AT %H:%M", d)
end
return osdate ("!%b %d %Y AT %H:%M", d)
end
local rem_duration = function (dt)
--[[-- remind(1): Note that duration is specified in hours and minutes. --]]--
local s
local ret = ""
s = dt % 60
ret = ret .. stringformat ("%0.2d", s)
dt = mathfloor (dt / 60)
if dt == 0 then return ret end
return stringformat ("%0.2d:%s", dt, ret)
end
local rem_date_duration = function (t0, te, loctime)
local dt = te - t0
local s_t0 = rem_date (t0, loctime)
local s_dt = rem_duration (dt)
return stringformat ("%s DURATION %s", s_t0, s_dt)
end
local date_of_interval = function (dtstart, dtend)
local t0, loctime = parse_date_value (dtstart)
local te, _ignore = parse_date_value (dtend)
if t0 ~= nil then
if te ~= nil then return rem_date_duration (t0, te, loctime) end
return rem_date (t0, loctime)
end
return nil
end
local msg_of_description = function (val)
return val.value
end
local rem_of_vevent = function (ev)
local dtstart, dtend
local date, msg
local vals = ev.value
local nvals = #vals
for i = 1, nvals do
local val = vals [i]
if val.kind == "other" then
local valname = val.name
if valname == "description" then msg = msg_of_description (val)
elseif valname == "dtstart" then dtstart = val
elseif valname == "dtend" then dtend = val
else
noiseln ("rem_of_vevent: ignoring value [%s]", valname)
end
else
end
end
date = date_of_interval (dtstart, dtend)
if date == nil then
error ("could not derive date from event values")
end
if msg == nil then
error ("could not derive message text from event values")
end
return stringformat ("REM %s MSG %s", date, msg)
end
local rem_of_vcalendar = function (vcal)
local acc = { }
local vals = vcal.value
local nvals = #vals
for i = 1, nvals do
local val = vals [i]
if val.kind ~= "scope" or val.name ~= "VEVENT" then
noiseln ("rem_of_vcalendar: ignoring value %d of type [%s/%s]",
i, val.kind, val.name)
else
local ok, res = pcall (rem_of_vevent, val)
if ok then
acc [#acc + 1] = res
else
errorln ("rem_of_vcalendar: vevent %d contains invalid entry: %s",
i, tostring (res))
end
end
end
return tableconcat (acc, "\n")
end
rem_of_vcalendars = function (vcals)
local value = vcals.value
local nvcal = #value
local acc = { }
for i = 1, nvcal do
local vcal = value [i]
if vcal.kind ~= "scope" or vcal.name ~= "VCALENDAR" then
noiseln ("rem_of_vcalendars: ignoring object %d of type [%s/%s]",
i, vcal.kind, vcal.name)
else
acc [#acc + 1] = rem_of_vcalendar (vcal)
end
end
return tableconcat (acc, "\n")
end
end --- [rem_of_vcalendars]
-------------------------------------------------------------------------------
--- API
-------------------------------------------------------------------------------
local output_calendar = function (cal, fh)
fh = fh or iostdout
local ok, str = pcall (rem_of_vcalendars, cal)
if ok then
fh:write (str)
end
end
return { output_calendar = output_calendar
}
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