# .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 string.sub(str,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 string.sub(str,i,j)
> else
> local t={}
> for k,v in ipairs(i) do
> t[k]=string.sub(str,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
>
>-- 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_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
> return true
> end
> 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
> end
> return tostring(x)
>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:
>-- only for arrays
>function filter(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
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:
>Mon Feb 21 17:45:04 2022
sort_string:
>function sort_string(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_string(s)
> check_eq(sort_string(''), '', 'test_sort_string: empty')
> check_eq(sort_string('ba'), 'ab', 'test_sort_string: non-empty')
> check_eq(sort_string('abba'), 'aabb', 'test_sort_string: duplicates')
>end
- __teliva_timestamp: original
append:
>-- concatenate list 'elems' into 'l', modifying 'l' in the process
>function append(l, elems)
> for i=1,#elems do
> l[#l+1] = elems[i]
> end
>end
- __teliva_timestamp: original
Window:
>Window = curses.stdscr()
- __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
menu:
>-- To show app-specific hotkeys in the menu bar, add hotkey/command
>-- arrays of strings to the menu array.
>menu = {}
- __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:
>Sat Feb 26 21:49:00 2022
main:
>function main()
> task.spawn(main_task)
> task.scheduler()
> print('out of scheduler')
> Window:getch()
>end
- __teliva_timestamp:
>Sat Feb 26 21:50:11 2022
main_task:
>function main_task()
> local c = task.Channel:new()
> task.spawn(counter, c)
> for i=1,10 do
> print(c:recv())
> end
>end
- __teliva_timestamp:
>Sat Feb 26 21:50:11 2022
__teliva_note:
>a simple counter
counter:
>function counter(c)
> local i = 2
> while true do
> c:send(i)
> i = i+1
> end
>end
- __teliva_timestamp:
>Sat Feb 26 21:54:53 2022
filter_task:
>function filter_task(p, cin, cout)
> while true do
> local i = cin:recv()
> if i%p ~= 0 then
> cout:send(i)
> end
> end
>end
- __teliva_timestamp:
>Sat Feb 26 21:55:46 2022
main_task:
>function main_task()
> local primes = task.Channel:new()
> task.spawn(sieve, primes)
> for i=1,10 do
> print(primes:recv())
> end
>end
- __teliva_timestamp:
>Sat Feb 26 21:59:37 2022
__teliva_note:
>filter out multiples of a single number
sieve:
>function sieve(ch)
> local iota = task.Channel:new()
> task.spawn(counter, iota)
> task.spawn(filter_task, 2, iota, ch)
>end
- __teliva_timestamp:
>Sat Feb 26 22:08:07 2022
__teliva_note:
>implement the complete sieve algorithm
sieve:
>-- Set up a Sieve of Eratosthenes (https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes)
>-- for computing prime numbers by chaining tasks, one per prime.
>-- Each task is responsible for filtering out all multiples of its prime.
>function sieve(primes_ch)
> local c = task.Channel:new()
> task.spawn(counter, c)
> while true do
> local p, newc = c:recv(), task.Channel:new()
> primes_ch:send(p)
> task.spawn(filter_task, p, c, newc)
> c = newc
> end
>end
- __teliva_timestamp:
>Sat Feb 26 22:09:47 2022
main_task:
>function main_task(window)
> local primes = task.Channel:new()
> task.spawn(sieve, primes)
> while true do
> window:addstr(primes:recv())
> window:addstr(' ')
> window:refresh()
> end
>end
- __teliva_timestamp:
>Sat Feb 26 22:08:52 2022
__teliva_note:
>infinite primes
main:
>function main()
> Window:nodelay(true)
> Window:clear()
> task.spawn(main_task, Window)
> task.scheduler()
> print('key pressed; done')
> Window:nodelay(false)
> Window:getch()
>end
- __teliva_timestamp:
>Sat Feb 26 22:09:47 2022
__teliva_note:
>clear screen when it fills up; pause on keypress
>
>In Teliva getch() implicitly refreshes the screen.
main_task:
>function main_task(window)
> local primes = task.Channel:new()
> task.spawn(sieve, primes)
> local h, w = window:getmaxyx()
> while true do
> window:addstr(primes:recv())
> window:addstr(' ')
> local c = window:getch()
> if c then break end -- key pressed
> local y, x = window:getyx()
> if y > h-1 then
> window:clear()
> end
> end
>end
- __teliva_timestamp:
>Sat Feb 26 22:27:25 2022
doc:blurb:
>Sieve of Eratosthenes
>https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes
>
>A demonstration of tasks and channels, the primitives for (cooperative) concurrency in Teliva.
>
>We string together a cascade of tasks connected by channels. Every prime number gets a new task that prints the first incoming number, and then filters out multiples of it from the incoming channel.
>
>This approach has the advantage that we don't need to create an array of n numbers to compute primes less than n.
>
>However, we still need to create p tasks and p channels if there are p primes less than n. Probably not worth it, given tasks and channels are much larger than numbers. This is just a demo.
>
>The noticeable periodic pauses are perhaps due to garbage collection.