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add --from-file to read arbitrarily many images and circumvent the maximum command length of the shell (closes: #95)

This commit is contained in:
Johannes Schauer Marin Rodrigues 2021-05-07 10:58:46 +02:00
parent 9cda595cd5
commit ea2245757f
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1

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@ -2343,6 +2343,31 @@ def parse_borderarg(string):
return h, v return h, v
def from_file(path):
result = []
if path == "-":
content = sys.stdin.buffer.read()
else:
with open(path, "rb") as f:
content = f.read()
for path in content.split(b"\0"):
if path == b"":
continue
try:
# test-read a byte from it so that we can abort early in case
# we cannot read data from the file
with open(path, "rb") as im:
im.read(1)
except IsADirectoryError:
raise argparse.ArgumentTypeError('"%s" is a directory' % path)
except PermissionError:
raise argparse.ArgumentTypeError('"%s" permission denied' % path)
except FileNotFoundError:
raise argparse.ArgumentTypeError('"%s" does not exist' % path)
result.append(path)
return result
def input_images(path_expr): def input_images(path_expr):
if path_expr == "-": if path_expr == "-":
# we slurp in all data from stdin because we need to seek in it later # we slurp in all data from stdin because we need to seek in it later
@ -3299,8 +3324,10 @@ Report bugs at https://gitlab.mister-muffin.de/josch/img2pdf/issues
"the Python Imaging Library (PIL). If no input images are given, then " "the Python Imaging Library (PIL). If no input images are given, then "
'a single image is read from standard input. The special filename "-" ' 'a single image is read from standard input. The special filename "-" '
"can be used once to read an image from standard input. To read a " "can be used once to read an image from standard input. To read a "
'file in the current directory with the filename "-", pass it to ' 'file in the current directory with the filename "-" (or with a '
'img2pdf by explicitly stating its relative path like "./-".', 'filename starting with "-"), pass it to img2pdf by explicitly '
'stating its relative path like "./-". Cannot be used together with '
"--from-file.",
) )
parser.add_argument( parser.add_argument(
"-v", "-v",
@ -3319,6 +3346,19 @@ Report bugs at https://gitlab.mister-muffin.de/josch/img2pdf/issues
parser.add_argument( parser.add_argument(
"--gui", dest="gui", action="store_true", help="run experimental tkinter gui" "--gui", dest="gui", action="store_true", help="run experimental tkinter gui"
) )
parser.add_argument(
"--from-file",
metavar="FILE",
type=from_file,
default=[],
help="Read the list of images from FILE instead of passing them as "
"positional arguments. If this option is used, then the list of "
"positional arguments must be empty. The paths to the input images "
'in FILE are separated by NUL bytes. If FILE is "-" then the paths '
"are expected on standard input. This option is useful if you want "
"to pass more images than the maximum command length of your shell "
"permits. This option can be used with commands like `find -print0`.",
)
outargs = parser.add_argument_group( outargs = parser.add_argument_group(
title="General output arguments", title="General output arguments",
@ -3689,14 +3729,26 @@ and left/right, respectively. It is not possible to specify asymmetric borders.
args.pagesize, args.imgsize, args.border, args.fit, args.auto_orient args.pagesize, args.imgsize, args.border, args.fit, args.auto_orient
) )
if len(args.images) > 0 and len(args.from_file) > 0:
logger.error(
"%s: error: cannot use --from-file with positional arguments" % parser.prog
)
sys.exit(2)
elif len(args.images) == 0 and len(args.from_file) == 0:
# if no positional arguments were supplied, read a single image from # if no positional arguments were supplied, read a single image from
# standard input # standard input
if len(args.images) == 0:
logger.info("reading image from standard input") logger.info("reading image from standard input")
try: try:
args.images = [[sys.stdin.buffer.read()]] images = [sys.stdin.buffer.read()]
except KeyboardInterrupt: except KeyboardInterrupt:
sys.exit(0) sys.exit(0)
elif len(args.images) > 0 and len(args.from_file) == 0:
# On windows, each positional argument can expand into multiple paths
# because we do globbing ourselves. Here we flatten the list of lists
# again.
images = chain.from_iterable(args.images)
elif len(args.images) == 0 and len(args.from_file) > 0:
images = args.from_file
# with the number of pages being equal to the number of images, the # with the number of pages being equal to the number of images, the
# value passed to --viewer-initial-page must be between 1 and that number # value passed to --viewer-initial-page must be between 1 and that number
@ -3708,7 +3760,7 @@ and left/right, respectively. It is not possible to specify asymmetric borders.
"greater than zero" % parser.prog "greater than zero" % parser.prog
) )
sys.exit(2) sys.exit(2)
if args.viewer_initial_page > len(args.images): if args.viewer_initial_page > len(images):
parser.print_usage(file=sys.stderr) parser.print_usage(file=sys.stderr)
logger.error( logger.error(
"%s: error: argument --viewer-initial-page: must be " "%s: error: argument --viewer-initial-page: must be "
@ -3718,7 +3770,7 @@ and left/right, respectively. It is not possible to specify asymmetric borders.
try: try:
convert( convert(
*chain.from_iterable(args.images), *images,
engine=args.engine, engine=args.engine,
title=args.title, title=args.title,
author=args.author, author=args.author,