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Merge pull request #4420 from jdufresne/which
Simplify command discovery with stdlib shutil.which()
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commit
9174a4596c
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@ -4,6 +4,7 @@ Helper functions.
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import logging
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import os
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import shutil
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import subprocess
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import sys
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import tempfile
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@ -191,9 +192,12 @@ class PillowTestCase(unittest.TestCase):
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raise OSError()
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outfile = self.tempfile("temp.png")
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if command_succeeds([IMCONVERT, f, outfile]):
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return Image.open(outfile)
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raise OSError()
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rc = subprocess.call(
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[IMCONVERT, f, outfile], stdout=subprocess.DEVNULL, stderr=subprocess.STDOUT
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)
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if rc:
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raise OSError
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return Image.open(outfile)
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@unittest.skipIf(sys.platform.startswith("win32"), "requires Unix or macOS")
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@ -268,34 +272,20 @@ def hopper(mode=None, cache={}):
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return im.copy()
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def command_succeeds(cmd):
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"""
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Runs the command, which must be a list of strings. Returns True if the
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command succeeds, or False if an OSError was raised by subprocess.Popen.
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"""
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try:
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subprocess.call(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.STDOUT)
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except OSError:
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return False
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return True
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def djpeg_available():
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return command_succeeds(["djpeg", "-version"])
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return bool(shutil.which("djpeg"))
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def cjpeg_available():
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return command_succeeds(["cjpeg", "-version"])
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return bool(shutil.which("cjpeg"))
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def netpbm_available():
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return command_succeeds(["ppmquant", "--version"]) and command_succeeds(
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["ppmtogif", "--version"]
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)
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return bool(shutil.which("ppmquant") and shutil.which("ppmtogif"))
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def imagemagick_available():
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return IMCONVERT and command_succeeds([IMCONVERT, "-version"])
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return bool(IMCONVERT and shutil.which(IMCONVERT))
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def on_appveyor():
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