From 28f45f382bc71ed42bc266144b5d88ba6e605987 Mon Sep 17 00:00:00 2001
From: ville rantanen <ville.rantanen@iki.fi>
Date: Wed, 18 Apr 2018 09:36:58 +0300
Subject: [PATCH] generalize transfer-time

---
 web/transfer-time | 123 +++++++++++++++++++++++++++++++++-------------
 1 file changed, 89 insertions(+), 34 deletions(-)

diff --git a/web/transfer-time b/web/transfer-time
index 6bc46a9..0c01d85 100755
--- a/web/transfer-time
+++ b/web/transfer-time
@@ -36,29 +36,20 @@ def get_files_size(path):
     return float(total_size)
 
 
-def parse_speed(speed_string):
+def get_numerical(num_string):
 
-    if not "/" in speed_string:
-        return None
+    num_string = num_string.lower()
+    numerical_part = ''
+    last_digit = 0
+    for i,c in enumerate(num_string):
+        if is_digit(c):
+            last_digit = i + 1
+            numerical_part = num_string[0:last_digit]
 
-    (divisor_string, divider_string) = speed_string.split("/", 1)
+    if not is_numerical(numerical_part):
+        return None, None
 
-    divisor = parse_size(divisor_string)
-    if divisor == None:
-        # Cannot parse
-        return divisor
-
-    if divider_string == "s":
-        return divisor
-
-    if divider_string == "m":
-        return divisor / 60
-    if divider_string == "h":
-        return divisor / 3600
-    if divider_string == "d":
-        return divisor / (24 * 3600)
-
-    return None
+    return numerical_part, last_digit
 
 
 def parse_options():
@@ -66,22 +57,54 @@ def parse_options():
         description = 'Transfer time calculator',
         epilog = "You may omit the 'b' to time events. ex. '20 minutes / task, 7 tasks to do': %(prog)s 3/h 7"
     )
+    parser.add_argument(
+        '-r',
+        dest = 'rate',
+        help = "Rate: inverse of speed. Instead of 10b/s, write 0.1s/b",
+        action = "store_true",
+        default = False
+    )
     parser.add_argument('speed', help = "Speed of transfer (ex. 3.2Mb/s). Time units: s, m, h, d, w")
     parser.add_argument('size', help = "Data size (ex. 4.55GB), or folder/file path. Units: b, kb, mb, gb, tb, pb or kib, mib ... ")
     return parser.parse_args()
 
 
+def parse_rate(rate_string):
+
+    if not "/" in rate_string:
+        return None
+
+    (divisor_string, divider_string) = rate_string.split("/", 1)
+
+    numerical_part, last_digit = get_numerical(divisor_string)
+
+    if not is_numerical(numerical_part):
+        return None
+
+    numerical_part = float(numerical_part)
+    multiplier = divisor_string[last_digit:]
+
+    divider = parse_size("1"+divider_string)
+    if divider == None:
+        # Cannot parse
+        return divider
+
+    if multiplier == "s":
+        return divider / 1 / numerical_part
+
+    if multiplier == "m":
+        return divider / 60 / numerical_part
+    if multiplier == "h":
+        return divider / 3600 / numerical_part
+    if multiplier == "d":
+        return divider / (24 * 3600) / numerical_part
+
+    return None
+
+
 def parse_size(size_string):
 
-    size_string = size_string.lower()
-    numerical_part = ''
-    last_digit = 0
-    for i,c in enumerate(size_string):
-        if is_digit(c):
-            last_digit = i + 1
-            numerical_part = size_string[0:last_digit]
-
-
+    numerical_part, last_digit = get_numerical(size_string)
     if not is_numerical(numerical_part):
         return None
 
@@ -116,6 +139,31 @@ def parse_size(size_string):
     return None
 
 
+def parse_speed(speed_string):
+
+    if not "/" in speed_string:
+        return None
+
+    (divisor_string, divider_string) = speed_string.split("/", 1)
+
+    divisor = parse_size(divisor_string)
+    if divisor == None:
+        # Cannot parse
+        return divisor
+
+    if divider_string == "s":
+        return divisor
+
+    if divider_string == "m":
+        return divisor / 60
+    if divider_string == "h":
+        return divisor / 3600
+    if divider_string == "d":
+        return divisor / (24 * 3600)
+
+    return None
+
+
 def print_err(s):
     sys.stderr.write(str(s)+"\n")
     sys.stderr.flush()
@@ -128,11 +176,18 @@ def time_human(num):
 if __name__ == "__main__":
     opts = parse_options()
 
-    speed = parse_speed(opts.speed)
-    if speed == None:
-        print_err("Cannot parse speed ( ex. 3.5Mb/s )")
-        print_err("Speed: %s"%( opts.speed, ))
-        sys.exit(1)
+    if opts.rate:
+        speed = parse_rate(opts.speed)
+        if speed == None:
+            print_err("Cannot parse rate ( ex. 3.5s/kb )")
+            print_err("Rate: %s"%( opts.speed, ))
+            sys.exit(1)
+    else:
+        speed = parse_speed(opts.speed)
+        if speed == None:
+            print_err("Cannot parse speed ( ex. 3.5Mb/s )")
+            print_err("Speed: %s"%( opts.speed, ))
+            sys.exit(1)
 
     size = parse_size(opts.size)