smol.tlv

# .tlv file generated by https://github.com/akkartik/teliva
# You may edit it if you are careful; however, you may see cryptic errors if you
# violate Teliva's assumptions.
#
# .tlv files are representations of Teliva programs. Teliva programs consist of
# sequences of definitions. Each definition is a table of key/value pairs. Keys
# and values are both strings.
#
# Lines in .tlv files always follow exactly one of the following forms:
# - comment lines at the top of the file starting with '#' at column 0
# - beginnings of definitions starting with '- ' at column 0, followed by a
#   key/value pair
# - key/value pairs consisting of '  ' at column 0, containing either a
#   spaceless value on the same line, or a multi-line value
# - multiline values indented by more than 2 spaces, starting with a '>'
#
# If these constraints are violated, Teliva may unceremoniously crash. Please
# report bugs at http://akkartik.name/contact
- __teliva_timestamp: original
  str_helpers:
    >-- some string helpers from http://lua-users.org/wiki/StringIndexing
    >
    >-- index characters using []
    >getmetatable('').__index = function(str,i)
    >  if type(i) == 'number' then
    >    return str:sub(i,i)
    >  else
    >    return string[i]
    >  end
    >end
    >
    >-- ranges using (), selected bytes using {}
    >getmetatable('').__call = function(str,i,j)
    >  if type(i)~='table' then
    >    return str:sub(i,j)
    >  else
    >    local t={}
    >    for k,v in ipairs(i) do
    >      t[k]=str:sub(v,v)
    >    end
    >    return table.concat(t)
    >  end
    >end
    >
    >-- iterate over an ordered sequence
    >function q(x)
    >  if type(x) == 'string' then
    >    return x:gmatch('.')
    >  else
    >    return ipairs(x)
    >  end
    >end
    >
    >-- insert within string
    >function string.insert(str1, str2, pos)
    >  return str1:sub(1,pos)..str2..str1:sub(pos+1)
    >end
    >
    >function string.remove(s, pos)
    >  return s:sub(1,pos-1)..s:sub(pos+1)
    >end
    >
    >function string.pos(s, sub)
    >  return string.find(s, sub, 1, true)  -- plain=true to disable regular expressions
    >end
    >
    >-- TODO: backport utf-8 support from Lua 5.3
- __teliva_timestamp: original
  debugy:
    >debugy = 5
- __teliva_timestamp: original
  dbg:
    >-- helper for debug by print; overlay debug information towards the right
    >-- reset debugy every time you refresh screen
    >function dbg(window, s)
    >  local oldy = 0
    >  local oldx = 0
    >  oldy, oldx = window:getyx()
    >  window:mvaddstr(debugy, 60, s)
    >  debugy = debugy+1
    >  window:mvaddstr(oldy, oldx, '')
    >end
- __teliva_timestamp: original
  check:
    >function check(x, msg)
    >  if x then
    >    Window:addch('.')
    >  else
    >    print('F - '..msg)
    >    print('  '..str(x)..' is false/nil')
    >    teliva_num_test_failures = teliva_num_test_failures + 1
    >    -- overlay first test failure on editors
    >    if teliva_first_failure == nil then
    >      teliva_first_failure = msg
    >    end
    >  end
    >end
- __teliva_timestamp: original
  check_eq:
    >function check_eq(x, expected, msg)
    >  if eq(x, expected) then
    >    Window:addch('.')
    >  else
    >    print('F - '..msg)
    >    print('  expected '..str(expected)..' but got '..str(x))
    >    teliva_num_test_failures = teliva_num_test_failures + 1
    >    -- overlay first test failure on editors
    >    if teliva_first_failure == nil then
    >      teliva_first_failure = msg
    >    end
    >  end
    >end
- __teliva_timestamp: original
  eq:
    >function eq(a, b)
    >  if type(a) ~= type(b) then return false end
    >  if type(a) == 'table' then
    >    if #a ~= #b then return false end
    >    for k, v in pairs(a) do
    >      if b[k] ~= v then
    >        return false
    >      end
    >    end
    >    for k, v in pairs(b) do
    >      if a[k] ~= v then
    >        return false
    >      end
    >    end
    >    return true
    >  end
    >  return a == b
    >end
- __teliva_timestamp: original
  str:
    >-- smarter tostring
    >-- slow; used only for debugging
    >function str(x)
    >  if type(x) == 'table' then
    >    local result = ''
    >    result = result..#x..'{'
    >    for k, v in pairs(x) do
    >      result = result..str(k)..'='..str(v)..', '
    >    end
    >    result = result..'}'
    >    return result
    >  elseif type(x) == 'string' then
    >    return '"'..x..'"'
    >  end
    >  return tostring(x)
    >end
- __teliva_timestamp: original
  find_index:
    >function find_index(arr, x)
    >  for n, y in ipairs(arr) do
    >    if x == y then
    >      return n
    >    end
    >  end
    >end
- __teliva_timestamp: original
  trim:
    >function trim(s)
    >  return s:gsub('^%s*', ''):gsub('%s*$', '')
    >end
- __teliva_timestamp: original
  split:
    >function split(s, d)
    >  result = {}
    >  for match in (s..d):gmatch("(.-)"..d) do
    >    table.insert(result, match);
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  map:
    >-- only for arrays
    >function map(l, f)
    >  result = {}
    >  for _, x in ipairs(l) do
    >    table.insert(result, f(x))
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  reduce:
    >-- only for arrays
    >function reduce(l, f, init)
    >  result = init
    >  for _, x in ipairs(l) do
    >    result = f(result, x)
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  filter:
    >function filter(h, f)
    >  result = {}
    >  for k, v in pairs(h) do
    >    if f(k, v) then
    >      result[k] = v
    >    end
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  ifilter:
    >-- only for arrays
    >function ifilter(l, f)
    >  result = {}
    >  for _, x in ipairs(l) do
    >    if f(x) then
    >      table.insert(result, x)
    >    end
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  sort_letters:
    >function sort_letters(s)
    >  tmp = {}
    >  for i=1,#s do
    >    table.insert(tmp, s[i])
    >  end
    >  table.sort(tmp)
    >  local result = ''
    >  for _, c in pairs(tmp) do
    >    result = result..c
    >  end
    >  return result
    >end
    >
    >function test_sort_letters(s)
    >  check_eq(sort_letters(''), '', 'test_sort_letters: empty')
    >  check_eq(sort_letters('ba'), 'ab', 'test_sort_letters: non-empty')
    >  check_eq(sort_letters('abba'), 'aabb', 'test_sort_letters: duplicates')
    >end
- __teliva_timestamp: original
  count_letters:
    >-- TODO: handle unicode
    >function count_letters(s)
    >  local result = {}
    >  for i=1,s:len() do
    >    local c = s[i]
    >    if result[c] == nil then
    >      result[c] = 1
    >    else
    >      result[c] = result[c] + 1
    >    end
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  count:
    >-- turn an array of elements into a map from elements to their frequency
    >-- analogous to count_letters for non-strings
    >function count(a)
    >  local result = {}
    >  for i, v in ipairs(a) do
    >    if result[v] == nil then
    >      result[v] = 1
    >    else
    >      result[v] = result[v] + 1
    >    end
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  union:
    >function union(a, b)
    >  for k, v in pairs(b) do
    >    a[k] = v
    >  end
    >  return a
    >end
- __teliva_timestamp: original
  subtract:
    >-- set subtraction
    >function subtract(a, b)
    >  for k, v in pairs(b) do
    >    a[k] = nil
    >  end
    >  return a
    >end
- __teliva_timestamp: original
  all:
    >-- universal quantifier on sets
    >function all(s, f)
    >  for k, v in pairs(s) do
    >    if not f(k, v) then
    >      return false
    >    end
    >  end
    >  return true
    >end
- __teliva_timestamp: original
  to_array:
    >-- turn a set into an array
    >-- drops values
    >function to_array(h)
    >  local result = {}
    >  for k, _ in pairs(h) do
    >    table.insert(result, k)
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  append:
    >-- concatenate list 'elems' into 'l', modifying 'l' in the process
    >function append(l, elems)
    >  for i=1,#elems do
    >    table.insert(l, elems[i])
    >  end
    >end
- __teliva_timestamp: original
  prepend:
    >-- concatenate list 'elems' into the start of 'l', modifying 'l' in the process
    >function prepend(l, elems)
    >  for i=1,#elems do
    >    table.insert(l, i, elems[i])
    >  end
    >end
- __teliva_timestamp: original
  all_but:
    >function all_but(x, idx)
    >  if type(x) == 'table' then
    >    local result = {}
    >    for i, elem in ipairs(x) do
    >      if i ~= idx then
    >        table.insert(result,elem)
    >      end
    >    end
    >    return result
    >  elseif type(x) == 'string' then
    >    if idx < 1 then return x:sub(1) end
    >    return x:sub(1, idx-1) .. x:sub(idx+1)
    >  else
    >    error('all_but: unsupported type '..type(x))
    >  end
    >end
    >
    >function test_all_but()
    >  check_eq(all_but('', 0), '', 'all_but: empty')
    >  check_eq(all_but('abc', 0), 'abc', 'all_but: invalid low index')
    >  check_eq(all_but('abc', 4), 'abc', 'all_but: invalid high index')
    >  check_eq(all_but('abc', 1), 'bc', 'all_but: first index')
    >  check_eq(all_but('abc', 3), 'ab', 'all_but: final index')
    >  check_eq(all_but('abc', 2), 'ac', 'all_but: middle index')
    >end
- __teliva_timestamp: original
  set:
    >function set(l)
    >  local result = {}
    >  for i, elem in ipairs(l) do
    >    result[elem] = true
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  set_eq:
    >function set_eq(l1, l2)
    >  return eq(set(l1), set(l2))
    >end
    >
    >function test_set_eq()
    >  check(set_eq({1}, {1}), 'set_eq: identical')
    >  check(not set_eq({1, 2}, {1, 3}), 'set_eq: different')
    >  check(set_eq({1, 2}, {2, 1}), 'set_eq: order')
    >  check(set_eq({1, 2, 2}, {2, 1}), 'set_eq: duplicates')
    >end
- __teliva_timestamp: original
  clear:
    >function clear(lines)
    >  while #lines > 0 do
    >    table.remove(lines)
    >  end
    >end
- __teliva_timestamp: original
  zap:
    >function zap(target, src)
    >  clear(target)
    >  append(target, src)
    >end
- __teliva_timestamp: original
  mfactorial:
    >-- memoized version of factorial
    >-- doesn't memoize recursive calls, but may be good enough
    >mfactorial = memo1(factorial)
- __teliva_timestamp: original
  factorial:
    >function factorial(n)
    >  local result = 1
    >  for i=1,n do
    >    result = result*i
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  memo1:
    >-- a higher-order function that takes a function of a single arg
    >-- (that never returns nil)
    >-- and returns a memoized version of it
    >function memo1(f)
    >  local memo = {}
    >  return function(x)
    >    if memo[x] == nil then
    >      memo[x] = f(x)
    >    end
    >    return memo[x]
    >  end
    >end
    >
    >-- mfactorial doesn't seem noticeably faster
    >function test_memo1()
    >  for i=0,30 do
    >    check_eq(mfactorial(i), factorial(i), 'memo1 over factorial: '..str(i))
    >  end
    >end
- __teliva_timestamp: original
  num_permutations:
    >-- number of permutations of n distinct objects, taken r at a time
    >function num_permutations(n, r)
    >  return factorial(n)/factorial(n-r)
    >end
    >
    >-- mfactorial doesn't seem noticeably faster
    >function test_memo1()
    >  for i=0,30 do
    >    for j=0,i do
    >      check_eq(num_permutations(i, j), mfactorial(i)/mfactorial(i-j), 'num_permutations memoizes: '..str(i)..'P'..str(j))
    >    end
    >  end
    >end
- __teliva_timestamp: original
  menu:
    >-- To show app-specific hotkeys in the menu bar, add hotkey/command
    >-- arrays of strings to the menu array.
    >menu = {}
- __teliva_timestamp: original
  Window:
    >Window = curses.stdscr()
- __teliva_timestamp: original
  window:
    >-- constructor for fake screen and window
    >-- call it like this:
    >--   local w = window{
    >--     kbd=kbd('abc'),
    >--     scr=scr{h=5, w=4},
    >--   }
    >-- eventually it'll do everything a real ncurses window can
    >function window(h)
    >  h.__index = h
    >  setmetatable(h, h)
    >  h.__index = function(table, key)
    >    return rawget(h, key)
    >  end
    >  h.attrset = function(self, x)
    >    self.scr.attrs = x
    >  end
    >  h.attron = function(self, x)
    >    -- currently same as attrset since Lua 5.1 doesn't have bitwise operators
    >    -- doesn't support multiple attrs at once
    >--    local old = self.scr.attrs
    >--    self.scr.attrs = old|x
    >    self.scr.attrs = x
    >  end
    >  h.attroff = function(self, x)
    >    -- currently borked since Lua 5.1 doesn't have bitwise operators
    >    -- doesn't support multiple attrs at once
    >--    local old = self.scr.attrs
    >--    self.scr.attrs = old & (~x)
    >    self.scr.attrs = curses.A_NORMAL
    >  end
    >  h.getch = function(self)
    >    local c = table.remove(h.kbd, 1)
    >    if c == nil then return c end
    >    return string.byte(c)  -- for verisimilitude with ncurses
    >  end
    >  h.addch = function(self, c)
    >    local scr = self.scr
    >    if c == '\n' then
    >      scr.cursy = scr.cursy+1
    >      scr.cursx = 0
    >      return
    >    end
    >    if scr.cursy <= scr.h then
    >      scr[scr.cursy][scr.cursx] = {data=c, attrs=scr.attrs}
    >      scr.cursx = scr.cursx+1
    >      if scr.cursx > scr.w then
    >        scr.cursy = scr.cursy+1
    >        scr.cursx = 1
    >      end
    >    end
    >  end
    >  h.addstr = function(self, s)
    >    for i=1,s:len() do
    >      self:addch(s[i])
    >    end
    >  end
    >  h.mvaddch = function(self, y, x, c)
    >    self.scr.cursy = y
    >    self.scr.cursx = x
    >    self:addch(c)
    >  end
    >  h.mvaddstr = function(self, y, x, s)
    >    self.scr.cursy = y
    >    self.scr.cursx = x
    >    self:addstr(s)
    >  end
    >  h.clear = function(self)
    >    clear_scr(self.scr)
    >  end
    >  h.refresh = function(self)
    >    -- nothing
    >  end
    >  return h
    >end
- __teliva_timestamp: original
  kbd:
    >function kbd(keys)
    >  local result = {}
    >  for i=1,keys:len() do
    >    table.insert(result, keys[i])
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  scr:
    >function scr(props)
    >  props.cursx = 1
    >  props.cursy = 1
    >  clear_scr(props)
    >  return props
    >end
- __teliva_timestamp: original
  clear_scr:
    >function clear_scr(props)
    >  props.cursy = 1
    >  props.cursx = 1
    >  for y=1,props.h do
    >    props[y] = {}
    >    for x=1,props.w do
    >      props[y][x] = {data=' ', attrs=curses.A_NORMAL}
    >    end
    >  end
    >  return props
    >end
- __teliva_timestamp: original
  check_screen:
    >function check_screen(window, contents, message)
    >  local x, y = 1, 1
    >  for i=1,contents:len() do
    >    check_eq(window.scr[y][x].data, contents[i], message..'/'..y..','..x)
    >    x = x+1
    >    if x > window.scr.w then
    >      y = y+1
    >      x = 1
    >    end
    >  end
    >end
    >
    >-- putting it all together, an example test of both keyboard and screen
    >function test_check_screen()
    >  local lines = {
    >    c='123',
    >    d='234',
    >    a='345',
    >    b='456',
    >  }
    >  local w = window{
    >    kbd=kbd('abc'),
    >    scr=scr{h=3, w=5},
    >  }
    >  local y = 1
    >  while true do
    >    local b = w:getch()
    >    if b == nil then break end
    >    w:mvaddstr(y, 1, lines[string.char(b)])
    >    y = y+1
    >  end
    >  check_screen(w, '345  '..
    >                  '456  '..
    >                  '123  ',
    >              'test_check_screen')
    >end
- __teliva_timestamp: original
  check_reverse:
    >function check_reverse(window, contents, message)
    >  local x, y = 1, 1
    >  for i=1,contents:len() do
    >    if contents[i] ~= ' ' then
    >      -- hacky version while we're without bitwise operators on Lua 5.1
    >--      check(window.scr[y][x].attrs & curses.A_REVERSE, message..'/'..y..','..x)
    >      check_eq(window.scr[y][x].attrs, curses.A_REVERSE, message..'/'..y..','..x)
    >    else
    >      -- hacky version while we're without bitwise operators on Lua 5.1
    >--      check(window.scr[y][x].attrs & (~curses.A_REVERSE), message..'/'..y..','..x)
    >      check(window.scr[y][x].attrs ~= curses.A_REVERSE, message..'/'..y..','..x)
    >    end
    >    x = x+1
    >    if x > window.scr.w then
    >      y = y+1
    >      x = 1
    >    end
    >  end
    >end
- __teliva_timestamp: original
  check_bold:
    >function check_bold(window, contents, message)
    >  local x, y = 1, 1
    >  for i=1,contents:len() do
    >    if contents[i] ~= ' ' then
    >      -- hacky version while we're without bitwise operators on Lua 5.1
    >--      check(window.scr[y][x].attrs & curses.A_BOLD, message..'/'..y..','..x)
    >      check_eq(window.scr[y][x].attrs, curses.A_BOLD, message..'/'..y..','..x)
    >    else
    >      -- hacky version while we're without bitwise operators on Lua 5.1
    >--      check(window.scr[y][x].attrs & (~curses.A_BOLD), message..'/'..y..','..x)
    >      check(window.scr[y][x].attrs ~= curses.A_BOLD, message..'/'..y..','..x)
    >    end
    >    x = x+1
    >    if x > window.scr.w then
    >      y = y+1
    >      x = 1
    >    end
    >  end
    >end
- __teliva_timestamp: original
  check_color:
    >-- check which parts of a screen have the given color_pair
    >function check_color(window, cp, contents, message)
    >  local x, y = 1, 1
    >  for i=1,contents:len() do
    >    if contents[i] ~= ' ' then
    >      -- hacky version while we're without bitwise operators on Lua 5.1
    >--      check(window.scr[y][x].attrs & curses.color_pair(cp), message..'/'..y..','..x)
    >      check_eq(window.scr[y][x].attrs, curses.color_pair(cp), message..'/'..y..','..x)
    >    else
    >      -- hacky version while we're without bitwise operators on Lua 5.1
    >--      check(window.scr[y][x].attrs & (~curses.A_BOLD), message..'/'..y..','..x)
    >      check(window.scr[y][x].attrs ~= curses.color_pair(cp), message..'/'..y..','..x)
    >    end
    >    x = x+1
    >    if x > window.scr.w then
    >      y = y+1
    >      x = 1
    >    end
    >  end
    >end
- __teliva_timestamp: original
  sep:
    >-- horizontal separator
    >function sep(window)
    >  local y, _ = window:getyx()
    >  window:mvaddstr(y+1, 0, '')
    >  local _, cols = window:getmaxyx()
    >  for col=1,cols do
    >    window:addstr('_')
    >  end
    >end
- __teliva_timestamp: original
  render:
    >function render(window)
    >  window:clear()
    >  -- draw stuff to screen here
    >  window:attron(curses.A_BOLD)
    >  window:mvaddstr(1, 5, "example app")
    >  window:attrset(curses.A_NORMAL)
    >  for i=0,15 do
    >    window:attrset(curses.color_pair(i))
    >    window:mvaddstr(3+i, 5, "========================")
    >  end
    >  window:refresh()
    >end
- __teliva_timestamp: original
  update:
    >function update(window)
    >  local key = window:getch()
    >  -- process key here
    >end
- __teliva_timestamp: original
  init_colors:
    >function init_colors()
    >  for i=0,7 do
    >    curses.init_pair(i, i, -1)
    >  end
    >  curses.init_pair(8, 7, 0)
    >  curses.init_pair(9, 7, 1)
    >  curses.init_pair(10, 7, 2)
    >  curses.init_pair(11, 7, 3)
    >  curses.init_pair(12, 7, 4)
    >  curses.init_pair(13, 7, 5)
    >  curses.init_pair(14, 7, 6)
    >  curses.init_pair(15, -1, 15)
    >end
- __teliva_timestamp: original
  main:
    >function main()
    >  init_colors()
    >
    >  while true do
    >    render(Window)
    >    update(Window)
    >  end
    >end
- __teliva_timestamp: original
  doc:blurb:
    >To show a brief description of the app on the 'big picture' screen, put the text in a special buffer called 'doc:blurb'.
    >
    >You can also override the default big picture screen entirely by creating a buffer called 'doc:main'.
- __teliva_timestamp:
    >Mon Apr 11 21:47:50 2022
  main:
    >function main()
    >  init_colors()
    >  read_feeds()
    >
    >  while true do
    >    render(Window)
    >    update(Window)
    >  end
    >end
- __teliva_timestamp:
    >Mon Apr 11 21:49:18 2022
  read_feeds:
    >function read_feeds()
    >  local f = start_reading('feeds')
    >  while true
    >    local line = f.read()
    >    if line == nil then break end
    >  end
    >end
- __teliva_timestamp:
    >Mon Apr 11 21:52:26 2022
  read_feeds:
    >function read_feeds()
    >  local f = start_reading('feeds')
    >  Feeds = {}
    >  while true
    >    local feed = f.read()
    >    if feed == nil then break end
    >    table.insert(Feeds, feed)
    >  end
    >end
- __teliva_timestamp:
    >Mon Apr 11 21:52:33 2022
  Feeds:
    >Feeds = {}
- __teliva_timestamp:
    >Mon Apr 11 21:52:59 2022
  render:
    >function render(window)
    >  window:clear()
    >  -- draw stuff to screen here
    >  for i, feed in ipairs(Feeds) do
    >    print(feed)
    >  end
    >  window:refresh()
    >end
- __teliva_timestamp:
    >Mon Apr 11 21:53:11 2022
  read_feeds:
    >function read_feeds()
    >  local f = start_reading('feeds')
    >  Feeds = {}
    >  while true do
    >    local feed = f.read()
    >    if feed == nil then break end
    >    table.insert(Feeds, feed)
    >  end
    >end
- __teliva_timestamp:
    >Mon Apr 11 21:53:22 2022
  read_feeds:
    >function read_feeds()
    >  local f = start_reading(nil, 'feeds')
    >  Feeds = {}
    >  while true do
    >    local feed = f.read()
    >    if feed == nil then break end
    >    table.insert(Feeds, feed)
    >  end
    >end
- __teliva_timestamp:
    >Mon Apr 11 21:53:39 2022
  read_feeds:
    >function read_feeds()
    >  local f = start_reading(nil, 'feeds')
    >  if f == nil then return end
    >  Feeds = {}
    >  while true do
    >    local feed = f.read()
    >    if feed == nil then break end
    >    table.insert(Feeds, feed)
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 22:39:15 2022
  menu:
    >-- To show app-specific hotkeys in the menu bar, add hotkey/command
    >-- arrays of strings to the menu array.
    >menu = {
    >  {'^r', 'refresh all feeds'},
    >}
- __teliva_timestamp:
    >Fri Apr 22 22:39:45 2022
  update:
    >function update(window)
    >  local key = window:getch()
    >  if key == 18 then  -- ctrl-r
    >    print('aaa')
    >    window:getch()
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 22:40:02 2022
  update:
    >function update(window)
    >  local key = window:getch()
    >  if key == 18 then  -- ctrl-r
    >    download_feeds()
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 22:40:27 2022
  update:
    >function update(window)
    >  local key = window:getch()
    >  if key == 18 then  -- ctrl-r
    >    reload_feeds()
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 22:40:37 2022
  menu:
    >-- To show app-specific hotkeys in the menu bar, add hotkey/command
    >-- arrays of strings to the menu array.
    >menu = {
    >  {'^r', 'reload feeds'},
    >}
- __teliva_timestamp:
    >Fri Apr 22 22:41:00 2022
  reload_feeds:
    >function reload_feeds()
    >  print('aaa')
    >  Window:getch()
    >end
- __teliva_timestamp:
    >Fri Apr 22 22:41:37 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    print(feed)
    >  end
    >  Window:getch()
    >end
- __teliva_timestamp:
    >Fri Apr 22 22:43:36 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    Window:clear()
    >    print(response)
    >    Window:getch()
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 22:55:25 2022
  Items:
    >Items = {}
- __teliva_timestamp:
    >Fri Apr 22 22:57:54 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(type(status))
    >--?     parse_items(response)
    >    Window:clear()
    >    print(response)
    >--?     print(feed, #Items)
    >    Window:getch()
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 22:58:15 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    Window:clear()
    >    print(type(status))
    >--?     parse_items(response)
    >    print(response)
    >--?     print(feed, #Items)
    >    Window:getch()
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 22:59:10 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    if response == 200 then
    >      parse_items(response)
    >      Window:clear()
    >      print(response)
    >--?       print(feed, #Items)
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 22:59:38 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      parse_items(response)
    >      Window:clear()
    >      print(response)
    >--?       print(feed, #Items)
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:01:46 2022
  parse_items:
    >function parse_items(lines)
    >  for line in lines:gmatch('[^\n]*') do
    >    print('^', line, '$')
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:02:26 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      Window:clear()
    >      parse_items(response)
    >      print(response)
    >--?       print(feed, #Items)
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:02:53 2022
  parse_items:
    >function parse_items(lines)
    >  for line in lines:gmatch('[^\n]+') do
    >    print('^', line, '$')
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:06:14 2022
  parse_items:
    >function parse_items(lines)
    >  for line in lines:gmatch('[^\n]+') do
    >    local t, text = line:gmatch('([^%s]+)\t(.*)')
    >    print('^', t, '--', text, '$')
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:06:29 2022
  parse_items:
    >function parse_items(lines)
    >  for line in lines:gmatch('[^\n]+') do
    >    local t, text = line:match('([^%s]+)\t(.*)')
    >    print('^', t, '--', text, '$')
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:07:06 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      Window:clear()
    >      parse_items(feed, response)
    >      print(response)
    >--?       print(feed, #Items)
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:10:44 2022
  parse_items:
    >function parse_items(feed, lines)
    >  if Items[feed] == nil then Items[feed] = {} end
    >  for line in lines:gmatch('[^\n]+') do
    >    local t, text = line:match('([^%s]+)\t(.*)')
    >    table.insert(Items[feed], {time=parse_time(t), text=text})
    >  end
    >  table.sort(Items[feed], function(a, b) return a.time < b.time end)
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:11:24 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      Window:clear()
    >      parse_items(feed, response)
    >      for _, x in ipairs(Items) do
    >        print(x.time, x.text)
    >--?       print(feed, #Items)
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:11:36 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      Window:clear()
    >      parse_items(feed, response)
    >      for _, x in ipairs(Items) do
    >        print(x.time, x.text)
    >      end
    >--?       print(feed, #Items)
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:12:05 2022
  parse_time:
    >function parse_time(t)
    >  return t
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:13:02 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      Window:clear()
    >      parse_items(feed, response)
    >      for _, x in ipairs(Items[feed]) do
    >        print(x.time, x.text)
    >      end
    >--?       print(feed, #Items)
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:13:50 2022
  parse_items:
    >function parse_items(feed, lines)
    >  if Items[feed] == nil then Items[feed] = {} end
    >  for line in lines:gmatch('[^\n]+') do
    >    local t, text = line:match('([^%s]+)\t(.*)')
    >    print(t, text)
    >    table.insert(Items[feed], {time=parse_time(t), text=text})
    >  end
    >  table.sort(Items[feed], function(a, b) return a.time < b.time end)
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:14:36 2022
  parse_items:
    >function parse_items(feed, lines)
    >  if Items[feed] == nil then Items[feed] = {} end
    >  for line in lines:gmatch('[^\n]+') do
    >    print(line)
    >    local t, text = line:match('([^%s]+)\t(.*)')
    >    print(t, text)
    >    table.insert(Items[feed], {time=parse_time(t), text=text})
    >  end
    >  table.sort(Items[feed], function(a, b) return a.time < b.time end)
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:19:20 2022
  parse_items:
    >function parse_items(feed, lines)
    >  if Items[feed] == nil then Items[feed] = {} end
    >  for line in lines:gmatch('[^\n]+') do
    >    print(line)
    >    local t, status = line:match('([^%s]+)\t(.*)')
    >    if t and status then
    >      print(t, text)
    >      table.insert(Items[feed], {time=parse_time(t), text=text})
    >    end
    >  end
    >  table.sort(Items[feed], function(a, b) return a.time < b.time end)
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:19:44 2022
  parse_items:
    >function parse_items(feed, lines)
    >  if Items[feed] == nil then Items[feed] = {} end
    >  for line in lines:gmatch('[^\n]+') do
    >    print(line)
    >    local t, status = line:match('([^%s]+)\t(.*)')
    >    if t and status then
    >      print(t, status)
    >      table.insert(Items[feed], {time=parse_time(t), status=status})
    >    end
    >  end
    >  table.sort(Items[feed], function(a, b) return a.time < b.time end)
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:19:56 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      Window:clear()
    >      parse_items(feed, response)
    >      for _, x in ipairs(Items[feed]) do
    >        print(x.time, x.status)
    >      end
    >--?       print(feed, #Items)
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:21:40 2022
  parse_items:
    >function parse_items(feed, lines)
    >  if Items[feed] == nil then Items[feed] = {} end
    >  for line in lines:gmatch('[^\n]+') do
    >    local t, status = line:match('([^%s]+)\t(.*)')
    >    if t and status then
    >      table.insert(Items[feed], {time=parse_time(t), status=status})
    >    end
    >  end
    >  table.sort(Items[feed], function(a, b) return a.time < b.time end)
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:23:29 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      Window:clear()
    >      parse_items(feed, response)
    >      local all_items = {}
    >      for feed, items in pairs(Items) do
    >        for _, item in ipairs(items) do
    >          table.insert(all_items, item)
    >        end
    >      end
    >      table.sort(all_items, function(a, b) return a.time < b.time end)
    >      for _, item in ipairs(all_items) do
    >        print(x.time, x.status)
    >      end
    >--?       print(feed, #Items)
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:23:48 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      Window:clear()
    >      parse_items(feed, response)
    >      local all_items = {}
    >      for feed, items in pairs(Items) do
    >        for _, item in ipairs(items) do
    >          table.insert(all_items, item)
    >        end
    >      end
    >      table.sort(all_items, function(a, b) return a.time < b.time end)
    >      for _, x in ipairs(all_items) do
    >        print(x.time, x.status)
    >      end
    >--?       print(feed, #Items)
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:24:28 2022
  parse_items:
    >function parse_items(feed, lines)
    >  if Items[feed] == nil then Items[feed] = {} end
    >  for line in lines:gmatch('[^\n]+') do
    >    local t, status = line:match('([^%s]+)\t(.*)')
    >    if t and status then
    >      table.insert(Items[feed], {feed=feed, time=parse_time(t), status=status})
    >    end
    >  end
    >  table.sort(Items[feed], function(a, b) return a.time < b.time end)
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:25:34 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      Window:clear()
    >      parse_items(feed, response)
    >      local all_items = {}
    >      for feed, items in pairs(Items) do
    >        for _, item in ipairs(items) do
    >          table.insert(all_items, item)
    >        end
    >      end
    >      table.sort(all_items, function(a, b) return a.time < b.time end)
    >      for _, x in ipairs(all_items) do
    >        print(x.feed, x.time, x.status)
    >      end
    >--?       print(feed, #Items)
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:27:08 2022
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      Window:clear()
    >      parse_items(feed, response)
    >      local all_items = {}
    >      for feed, items in pairs(Items) do
    >        for _, item in ipairs(items) do
    >          table.insert(all_items, item)
    >        end
    >      end
    >      table.sort(all_items, function(a, b) return a.time < b.time end)
    >      for _, x in ipairs(all_items) do
    >        print(x.feed, x.time, x.status)
    >      end
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:29:49 2022
  parse_items:
    >function parse_items(feed, lines)
    >  if Items[feed] == nil then Items[feed] = {} end
    >  for line in lines:gmatch('[^\n]+') do
    >    local t, status = line:match('([^%s]+)\t(.*)')
    >    if t and status then
    >      table.insert(Items[feed], {feed=feed, time=t, parsed_time=parse_time(t), status=status})
    >    end
    >  end
    >  table.sort(Items[feed], compare_parsed_time)
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:31:16 2022
  compare_parsed_time:
    >function compare_parsed_time(a, b)
    >  local a, b = a.parsed_time, b.parsed_time
    >  if a.
- __teliva_timestamp:
    >Fri Apr 22 23:34:46 2022
  parse_time:
    >function parse_time(t)
    >  local year, month, day, hour, min, sec, patt_end = str:match("^(%d%d%d%d)%-(%d%d)%-(%d%d)[Tt](%d%d%.?%d*):(%d%d):(%d%d)()")
    >  return { year=year, month=month, day=day, hour=hour, min=min, sec=sec }
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:36:13 2022
  compare_parsed_time:
    >function compare_parsed_time(a, b)
    >  local a, b = a.parsed_time, b.parsed_time
    >  if a.year ~= b.year then return a.year < b.year end
    >  if a.month ~= b.month then return a.month < b.month end
    >  if a.day ~= b.day then return a.day < b.day end
    >  if a.hour ~= b.hour then return a.hour < b.hour end
    >  if a.min ~= b.min then return a.min < b.min end
    >  return a.sec < b.sec
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:36:35 2022
  parse_time:
    >function parse_time(t)
    >  local year, month, day, hour, min, sec, patt_end = t:match("^(%d%d%d%d)%-(%d%d)%-(%d%d)[Tt](%d%d%.?%d*):(%d%d):(%d%d)()")
    >  return { year=year, month=month, day=day, hour=hour, min=min, sec=sec }
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:39:20 2022
  parse_time:
    >function parse_time(t)
    >  local year, month, day, hour, min, sec, tz_hour, tz_min = t:match("^(%d%d%d%d)%-(%d%d)%-(%d%d)[Tt](%d%d%.?%d*):(%d%d):(%d%d)[+-](%d%d):(%d%d)")
    >  return { year=year, month=month, day=day, hour=hour, min=min, sec=sec, tz_hour=tz_hour, tz_min=tz_min }
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:47:55 2022
  parse_time:
    >function parse_time(t)
    >  local year, month, day, hour, min, sec, tz_op, tz_hour, tz_min = t:match("^(%d%d%d%d)%-(%d%d)%-(%d%d)[Tt](%d%d%.?%d*):(%d%d):(%d%d)([+-])(%d%d):(%d%d)")
    >  if tz_op == '+' then
    >    hour = int(hour) + int(tz_hour)
    >    min = int(min) + int(tz_min)
    >  else
    >    hour = int(hour) - int(tz_hour)
    >    min = int(min) - int(tz_min)
    >  end
    >  return os.time{ year=int(year), month=int(month), day=int(day), hour=int(hour), min=int(min), sec=int(sec) }
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:48:46 2022
  compare_parsed_time:
    >function compare_parsed_time(a, b)
    >  return a.parsed_time < b.parsed_time
    >end
    >
    >-- unused
    >function compare_parsed_time2(a, b)
    >  local a, b = a.parsed_time, b.parsed_time
    >  if a.year ~= b.year then return a.year < b.year end
    >  if a.month ~= b.month then return a.month < b.month end
    >  if a.day ~= b.day then return a.day < b.day end
    >  if a.hour ~= b.hour then return a.hour < b.hour end
    >  if a.min ~= b.min then return a.min < b.min end
    >  return a.sec < b.sec
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:49:13 2022
  parse_time:
    >function parse_time(t)
    >  local year, month, day, hour, min, sec, tz_op, tz_hour, tz_min = t:match("^(%d%d%d%d)%-(%d%d)%-(%d%d)[Tt](%d%d%.?%d*):(%d%d):(%d%d)([+-])(%d%d):(%d%d)")
    >  local int = tonumber
    >  if tz_op == '+' then
    >    hour = int(hour) + int(tz_hour)
    >    min = int(min) + int(tz_min)
    >  else
    >    hour = int(hour) - int(tz_hour)
    >    min = int(min) - int(tz_min)
    >  end
    >  return os.time{ year=int(year), month=int(month), day=int(day), hour=int(hour), min=int(min), sec=int(sec) }
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:51:08 2022
  parse_time:
    >function parse_time(t)
    >  local year, month, day, hour, min, sec, tz_op, tz_hour, tz_min = t:match("^(%d%d%d%d)%-(%d%d)%-(%d%d)[Tt](%d%d%.?%d*):(%d%d):(%d%d)([+-])(%d%d):(%d%d)")
    >  local int = tonumber
    >  -- convert to UTC
    >  if tz_op == '+' then
    >    hour = int(hour) - int(tz_hour)
    >    min = int(min) - int(tz_min)
    >  else
    >    hour = int(hour) + int(tz_hour)
    >    min = int(min) + int(tz_min)
    >  end
    >  return os.time{ year=int(year), month=int(month), day=int(day), hour=hour, min=min, sec=int(sec) }
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:52:27 2022
  __teliva_note:
    >parsing twtxt feeds and sorting items after accounting for timezones
  reload_feeds:
    >function reload_feeds()
    >  for _, feed in ipairs(Feeds) do
    >    local response, status, headers = http.request(feed)
    >    print(status)
    >    if status == 200 then
    >      Window:clear()
    >      parse_items(feed, response)
    >      local all_items = {}
    >      for feed, items in pairs(Items) do
    >        for _, item in ipairs(items) do
    >          table.insert(all_items, item)
    >        end
    >      end
    >      table.sort(all_items, function(a, b) return a.parsed_time < b.parsed_time end)
    >      for _, x in ipairs(all_items) do
    >        print(x.feed, x.time, x.status)
    >      end
    >      Window:getch()
    >    end
    >  end
    >end
- __teliva_timestamp:
    >Fri Apr 22 23:57:10 2022
  update:
    >function update(window)
    >  local key = window:getch()
    >  if key == 18 then  -- ctrl-r
    >    reload_feeds(window)
    >  end
    >end
- __teliva_timestamp:
    >Sat Apr 23 00:13:26 2022
  render_feed_status:
    >function render_feed_status(window, fs)
    >  window:clear()
    >  for _, fs in ipairs(feed_status) do
    >    if fs.status then
    >      if fs.status/100 == 2 then
    >        window:attrset(curses.color_pair(10))
    >        window:addstr(fs.feed..'\n')
    >        window:attrset(curses.A_NORMAL)
    >      else
    >        window:attrset(curses.color_pair(9))
    >        window:addstr(fs.feed..'\n')
    >        window:attrset(curses.A_NORMAL)
    >      end
    >    else
    >      window:addstr(fs.feed..'\n')
    >    end
    >  end
    >  window:refresh()
    >end
- __teliva_timestamp:
    >Sat Apr 23 00:18:59 2022
  render:
    >function render(window)
    >  window:clear()
    >  -- draw feeds
    >  for i, feed in ipairs(Feeds) do
    >    print(feed)
    >  end
    >  -- draw items
    >  local all_items = {}
    >  local n = 0
    >  for feed, items in pairs(Items) do
    >    n = n+1
    >    for _, item in ipairs(items) do
    >      table.insert(all_items, item)
    >    end
    >  end
    >  table.sort(all_items, function(a, b) return a.parsed_time < b.parsed_time end)
    >  for _, x in ipairs(all_items) do
    >    print(x.feed, x.time, x.status)
    >  end
    >  window:refresh()
    >end
- __teliva_timestamp:
    >Sat Apr 23 00:20:31 2022
  __teliva_note:
    >show progress when downloading feeds
  reload_feeds:
    >function reload_feeds(window)
    >  window:nodelay(true)
    >  feed_status = {}
    >  for _, feed in ipairs(Feeds) do
    >    table.insert(feed_status, {feed=feed})
    >  end
    >  for _, fs in ipairs(feed_status) do
    >    local response, status, headers = http.request(fs.feed)
    >    fs.status = status
    >    parse_items(fs.feed, response)
    >    render_feed_status(window, fs)
    >    if window:getch() then break end
    >  end
    >  window:nodelay(false)
    >end
- __teliva_timestamp:
    >Sat Apr 23 00:28:09 2022
  render:
    >function render(window)
    >  window:clear()
    >  -- draw feeds
    >  print(str(#Feeds)..' feeds')
    >  -- draw items
    >  local all_items = {}
    >  local n = 0
    >  for feed, items in pairs(Items) do
    >    n = n+1
    >    for _, item in ipairs(items) do
    >      table.insert(all_items, item)
    >    end
    >  end
    >  table.sort(all_items, function(a, b) return a.parsed_time < b.parsed_time end)
    >  for _, x in ipairs(all_items) do
    >    print(x.feed, x.time, x.status)
    >  end
    >  window:refresh()
    >end
- __teliva_timestamp:
    >Sat Apr 23 00:29:10 2022
  reload_feeds:
    >function reload_feeds(window)
    >  window:nodelay(true)
    >  feed_status = {}
    >  for _, feed in ipairs(Feeds) do
    >    table.insert(feed_status, {feed=feed})
    >  end
    >  render_feed_status(
    >  for _, fs in ipairs(feed_status) do
    >    local response, status, headers = http.request(fs.feed)
    >    fs.status = status
    >    parse_items(fs.feed, response)
    >    render_feed_status(window, fs)
    >    if window:getch() then break end
    >  end
    >  window:nodelay(false)
    >end
- __teliva_timestamp:
    >Sat Apr 23 00:29:23 2022
  render_feed_status:
    >function render_feed_status(window, feed_status)
    >  window:clear()
    >  for _, fs in ipairs(feed_status) do
    >    if fs.status then
    >      if fs.status/100 == 2 then
    >        window:attrset(curses.color_pair(10))
    >        window:addstr(fs.feed..'\n')
    >        window:attrset(curses.A_NORMAL)
    >      else
    >        window:attrset(curses.color_pair(9))
    >        window:addstr(fs.feed..'\n')
    >        window:attrset(curses.A_NORMAL)
    >      end
    >    else
    >      window:addstr(fs.feed..'\n')
    >    end
    >  end
    >  window:refresh()
    >end
- __teliva_timestamp:
    >Sat Apr 23 00:29:48 2022
  reload_feeds:
    >function reload_feeds(window)
    >  window:nodelay(true)
    >  local feed_status = {}
    >  for _, feed in ipairs(Feeds) do
    >    table.insert(feed_status, {feed=feed})
    >  end
    >  render_feed_status(feed_status)
    >  for _, fs in ipairs(feed_status) do
    >    local response, status, headers = http.request(fs.feed)
    >    fs.status = status
    >    parse_items(fs.feed, response)
    >    render_feed_status(window, feed_status)
    >    if window:getch() then break end
    >  end
    >  window:nodelay(false)
    >end
- __teliva_timestamp:
    >Sat Apr 23 00:30:18 2022
  __teliva_note:
    >fix an accidental global variable
  reload_feeds:
    >function reload_feeds(window)
    >  window:nodelay(true)
    >  local feed_status = {}
    >  for _, feed in ipairs(Feeds) do
    >    table.insert(feed_status, {feed=feed})
    >  end
    >  render_feed_status(window, feed_status)
    >  for _, fs in ipairs(feed_status) do
    >    local response, status, headers = http.request(fs.feed)
    >    fs.status = status
    >    parse_items(fs.feed, response)
    >    render_feed_status(window, feed_status)
    >    if window:getch() then break end
    >  end
    >  window:nodelay(false)
    >end
- __teliva_timestamp:
    >Sat Apr 23 00:45:54 2022
  __teliva_note:
    >ignore non-compliant "comments" containing tabs
    >https://merveilles.town/@akkartik/108179923032818671
  parse_items:
    >function parse_items(feed, lines)
    >  if Items[feed] == nil then Items[feed] = {} end
    >  for line in lines:gmatch('[^\n]+') do
    >    local t, status = line:match('([0-9][^%s]+)\t(.*)')
    >    if t and status then
    >      table.insert(Items[feed], {feed=feed, time=t, parsed_time=parse_time(t), status=status})
    >    end
    >  end
    >  table.sort(Items[feed], compare_parsed_time)
    >end
- __teliva_timestamp:
    >Sat Apr 23 00:52:39 2022
  render_feed_status:
    >function render_feed_status(window, feed_status)
    >  window:clear()
    >  for _, fs in ipairs(feed_status) do
    >    if fs.status then
    >      if fs.status == 2 then
    >        window:attrset(curses.color_pair(10))
    >        window:addstr(fs.feed..'\n')
    >        window:attrset(curses.A_NORMAL)
    >      else
    >        window:attrset(curses.color_pair(9))
    >        window:addstr(fs.feed..'\n')
    >        window:attrset(curses.A_NORMAL)
    >      end
    >    else
    >      window:addstr(fs.feed..'\n')
    >    end
    >  end
    >  window:refresh()
    >end
- __teliva_timestamp:
    >Sat Apr 23 00:56:34 2022
  __teliva_note:
    >handle errors in requests
  reload_feeds:
    >function reload_feeds(window)
    >  window:nodelay(true)
    >  local feed_status = {}
    >  for _, feed in ipairs(Feeds) do
    >    table.insert(feed_status, {feed=feed})
    >  end
    >  render_feed_status(window, feed_status)
    >  for _, fs in ipairs(feed_status) do
    >    local response, status, headers = http.request(fs.feed)
    >    if response == nil then
    >      fs.status = 4  -- treat any network issue like a 404
    >    else
    >      fs.status = status/100
    >      if fs.status == 2 then
    >        parse_items(fs.feed, response)
    >      end
    >      render_feed_status(window, feed_status)
    >    end
    >    if window:getch() then break end
    >  end
    >  window:nodelay(false)
    >end
- __teliva_timestamp:
    >Sat Apr 23 01:06:55 2022
  __teliva_note:
    >handle more time formats
  parse_time:
    >function parse_time(t)
    >  local int = tonumber
    >  -- hackily strip out fractions of seconds
    >  local year, month, day, hour, min, sec, tz_op, tz_hour, tz_min = t:match("^(%d%d%d%d)%-(%d%d)%-(%d%d)[Tt](%d%d%.?%d*):(%d%d):(%d%d)%.?[0-9]*([+-])(%d%d):(%d%d)")
    >  if year == nil then
    >    year, month, day, hour, min, sec = t:match("^(%d%d%d%d)%-(%d%d)%-(%d%d)[Tt](%d%d%.?%d*):(%d%d):(%d%d)%.?[0-9]*[Zz]")
    >  end
    >  if year == nil then
    >    return 0
    >  end
    >  -- convert to UTC
    >  if tz_op == '+' then
    >    hour = int(hour) - int(tz_hour)
    >    min = int(min) - int(tz_min)
    >  elseif tz_op == '-' then
    >    hour = int(hour) + int(tz_hour)
    >    min = int(min) + int(tz_min)
    >  end
    >  return os.time{ year=int(year), month=int(month), day=int(day), hour=hour, min=min, sec=int(sec) }
    >end
    >
    >function test_parse_time()
    >  parse_time('2019-07-31T14:19+01:00')  -- invalid per https://www.ietf.org/rfc/rfc3339.txt, but seen in the while; just ignore
    >  parse_time('2019-09-16T01:13:07-07:00')
    >  parse_time('2019-09-16T01:13:07Z')
    >end