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#!/usr/bin/env python3
import sys
import errno
from subprocess import call, PIPE
def check_dependencies():
"""Check if the required command line apps exist."""
exe = ".exe" if (sys.platform == "win32") else ""
status = True
dependencies = {
"jpegoptim": "--version",
"optipng": "-v",
"advpng": "--version",
"pngcrush": "-version"
}
for elt in dependencies:
retcode = safe_call(elt + exe + " " + dependencies[elt])
if retcode != 0:
status = False
print("[error] please install {}".format(elt), file=sys.stderr)
return status
def safe_call(command):
"""Cross-platform command-line check."""
while True:
try:
return call(command, shell=True, stdout=PIPE)
except OSError as e:
if e.errno == errno.EINTR:
continue
else:
raise
def human_readable_size(num, suffix="B"):
"""Bytes to a readable size format"""
for unit in ["", "K", "M", "G", "T", "P", "E", "Z"]:
if abs(num) < 1024.0:
return "%3.1f%s%s" % (num, unit, suffix)
num /= 1024.0
return "%.1f%s%s" % (num, "Y", suffix)
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