make timer accurate; add non blocking input

- timer accurate and quits when 'q' is pressed, in a non blocking
  manner, polling at 120Hz
- some minor refactoring in inputs.py too

1 files changed, 21 insertions, 13 deletions

diff --git a/inputs.py b/inputs.py
index 47160c3..37044f9 100644
--- a/inputs.py
+++ b/inputs.py
@@ -1,32 +1,35 @@
-import sys, tty, termios
+import sys
+import tty
+import termios
+import select
+import datetime
 
 def getch():
-    import sys, tty, termios
-    old_settings = termios.tcgetattr(0)
+    """get next character without needing to press enter"""
+    old_settings = termios.tcgetattr(sys.stdin)
     new_settings = old_settings[:]
     new_settings[3] &= ~termios.ICANON
     try:
         termios.tcsetattr(0, termios.TCSANOW, new_settings)
         ch = sys.stdin.read(1)
-#    except BlockingIOError:
-#        pass
     finally:
         termios.tcsetattr(0, termios.TCSANOW, old_settings)
     return ch
 
+def getch_nb(timeout):
+    """gets next character in cbreak; returns false if none; cbreak must be set before"""
+    ch = False
+    if select.select([sys.stdin], [], [], timeout) == ([sys.stdin], [], []):
+        ch = sys.stdin.read(1)
+    return ch
+
 def get_valid_char(char_list):
     """returns input if it matches a list of valid chars, else retruns False"""
-    valid = False
-
     in_char = getch()
     for char in char_list:
         if in_char == char:
-            valid = True
-            break
-
-    if not valid:
-        return False
-    return in_char
+            return in_char
+    return False
 
 def get_pos_int():
     """returns input as int; returns False if not a positive integer"""
@@ -38,3 +41,8 @@ def get_pos_int():
         if in_int < 1:
             return False
         return in_int
+
+def delta_to_HM(delta):
+    """returns a %H:%M string from a timedelta object"""
+    mins, secs = divmod(int(delta.total_seconds()), 60)
+    return str(mins).zfill(2) + ":" + str(secs).zfill(2)