add Lua linkhut examplev1.0.0

1 files changed, 117 insertions, 0 deletions

diff --git a/examples/linkhut.lua b/examples/linkhut.lua
new file mode 100644
index 0000000..8987bd9
--- /dev/null
+++ b/examples/linkhut.lua
@@ -0,0 +1,117 @@
+local al = require 'abletonlink'
+local termio = require 'posix.termio'
+local poll = require 'posix.poll'
+
+function print_help()
+  print([[
+ < L I N K  H U T >
+
+usage:
+  enable / disable Link: a
+  start / stop: space
+  decrease / increase tempo: w / e
+  decrease / increase quantum: r / t
+  enable / disable start stop sync: s
+  quit: q]])
+end
+
+function set_buffered_input(enable)
+  local t = termio.tcgetattr(0)
+  if enable then
+    t.lflag = t.lflag | termio.ICANON
+  else
+    t.lflag = t.lflag & (~termio.ICANON)
+  end
+  termio.tcsetattr(0, termio.TCSANOW, t)
+end
+
+function wait_for_input()
+  return poll.rpoll(0, 50) > 0
+end
+
+function clear_line()
+  io.stdout:write('   \r')
+  io.stdout:flush()
+end
+
+function print_state_header()
+  print("\nenabled | num peers | quantum | start stop sync | tempo   | beats   | metro")
+end
+
+function print_state()
+  link:capture_app_session_state(session_state)
+
+  local time = link:clock_micros()
+  local enabled = link:is_enabled() and "yes" or "no"
+  local num_peers = link:num_peers()
+  local start_stop = link:is_start_stop_sync_enabled() and "yes" or " no"
+  local tempo = session_state:tempo()
+  local playing = session_state:is_playing() and "[playing]" or "[stopped]"
+  local beats = session_state:beat_at_time(time, quantum)
+  local phase = session_state:phase_at_time(time, quantum)
+
+  local bts = ''
+  for i = 0, math.ceil(quantum) do
+    bts = bts .. (i < phase and 'X' or 'O')
+  end
+
+  io.stdout:write(string.format(
+    "%7s | %9d | %7.f | %3s %11s | %7.2f | %7.2f | %s",
+    enabled, num_peers, quantum, start_stop, playing, tempo, beats, bts
+  ))
+end
+
+function input()
+  char = io.read(1)
+
+  local time = link:clock_micros()
+  local enabled = link:is_enabled()
+  local start_stop = link:is_start_stop_sync_enabled()
+  local tempo = session_state:tempo()
+
+  link:capture_app_session_state(session_state)
+
+  if char == 'q' then
+    running = false
+    clear_line()
+  elseif char == 'a' then
+    link:enable(not enabled)
+  elseif char == 'w' then
+    session_state:set_tempo(tempo - 1, time)
+  elseif char == 'e' then
+    session_state:set_tempo(tempo + 1, time)
+  elseif char == 'r' then
+    quantum = quantum - 1
+  elseif char == 't' then
+    quantum = quantum + 1
+  elseif char == 's' then
+    link:enable_start_stop_sync(not start_stop)
+  elseif char == ' ' then
+    if session_state:is_playing() then
+      session_state:set_is_playing(false, time)
+    else
+      session_state:set_is_playing_and_request_beat_at_time(true, time, 0, quantum)
+    end
+  end
+
+  link:commit_app_session_state(session_state)
+end
+
+link = al.create(120)
+session_state = al.create_session_state()
+running = true
+quantum = 4
+
+print_help()
+print_state_header()
+set_buffered_input(false)
+
+while running do
+  clear_line()
+  if wait_for_input() then
+    input()
+  else
+    print_state()
+  end
+end
+set_buffered_input(true)