1 files changed, 50 insertions, 0 deletions
diff --git a/netlib/human.py b/netlib/human.py
new file mode 100644
index 00000000..a007adc7
--- /dev/null
+++ b/netlib/human.py
@@ -0,0 +1,50 @@
+
+SIZE_TABLE = [
+    ("b", 1024 ** 0),
+    ("k", 1024 ** 1),
+    ("m", 1024 ** 2),
+    ("g", 1024 ** 3),
+    ("t", 1024 ** 4),
+]
+
+SIZE_UNITS = dict(SIZE_TABLE)
+
+
+def pretty_size(size):
+    for bottom, top in zip(SIZE_TABLE, SIZE_TABLE[1:]):
+        if bottom[1] <= size < top[1]:
+            suf = bottom[0]
+            lim = bottom[1]
+            x = round(size / lim, 2)
+            if x == int(x):
+                x = int(x)
+            return str(x) + suf
+    return "%s%s" % (size, SIZE_TABLE[0][0])
+
+
+def parse_size(s):
+    try:
+        return int(s)
+    except ValueError:
+        pass
+    for i in SIZE_UNITS.keys():
+        if s.endswith(i):
+            try:
+                return int(s[:-1]) * SIZE_UNITS[i]
+            except ValueError:
+                break
+    raise ValueError("Invalid size specification.")
+
+
+def pretty_duration(secs):
+    formatters = [
+        (100, "{:.0f}s"),
+        (10, "{:2.1f}s"),
+        (1, "{:1.2f}s"),
+    ]
+
+    for limit, formatter in formatters:
+        if secs >= limit:
+            return formatter.format(secs)
+    # less than 1 sec
+    return "{:.0f}ms".format(secs * 1000)