86 lines
3.2 KiB
Python
86 lines
3.2 KiB
Python
import subprocess
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import re
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from django.utils.translation import ugettext_lazy as _
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from converter.conf.settings import GM_PATH
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from converter.conf.settings import GM_SETTINGS
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from converter.literals import QUALITY_DEFAULT, QUALITY_SETTINGS
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from converter.exceptions import ConvertError, UnknownFormat, IdentifyError
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from converter.backends import ConverterBase
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CONVERTER_ERROR_STRING_NO_DECODER = u'No decode delegate for this image format'
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CONVERTER_ERROR_STARTS_WITH = u'starts with'
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class ConverterClass(ConverterBase):
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def identify_file(self, input_filepath, arguments=None):
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command = []
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command.append(unicode(GM_PATH))
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command.append(u'identify')
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if arguments:
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command.extend(arguments)
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command.append(unicode(input_filepath))
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proc = subprocess.Popen(command, close_fds=True, stderr=subprocess.PIPE, stdout=subprocess.PIPE)
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return_code = proc.wait()
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if return_code != 0:
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raise IdentifyError(proc.stderr.readline())
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return proc.stdout.read()
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def convert_file(self, input_filepath, output_filepath, quality=QUALITY_DEFAULT, arguments=None):
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command = []
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command.append(unicode(GM_PATH))
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command.append(u'convert')
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command.extend(unicode(QUALITY_SETTINGS[quality]).split())
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command.extend(unicode(GM_SETTINGS).split())
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command.append(unicode(input_filepath))
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if arguments:
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command.extend(unicode(arguments).split())
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command.append(unicode(output_filepath))
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proc = subprocess.Popen(command, close_fds=True, stderr=subprocess.PIPE, stdout=subprocess.PIPE)
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return_code = proc.wait()
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if return_code != 0:
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#Got an error from convert program
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error_line = proc.stderr.readline()
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if (CONVERTER_ERROR_STRING_NO_DECODER in error_line) or (CONVERTER_ERROR_STARTS_WITH in error_line):
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#Try to determine from error message which class of error is it
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raise UnknownFormat
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else:
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raise ConvertError(error_line)
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def get_format_list(self):
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"""
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Call GraphicsMagick to parse all of it's supported file formats, and
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return a list of the names and descriptions
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"""
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format_regex = re.compile(' *([A-Z0-9]+)[*]? +([A-Z0-9]+) +([rw\-+]+) *(.*).*')
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formats = []
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command = []
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command.append(unicode(GM_PATH))
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command.append(u'convert')
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command.append(u'-list')
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command.append(u'formats')
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proc = subprocess.Popen(command, close_fds=True, stderr=subprocess.PIPE, stdout=subprocess.PIPE)
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return_code = proc.wait()
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if return_code != 0:
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raise ConvertError(proc.stderr.readline())
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for line in proc.stdout.readlines():
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fields = format_regex.findall(line)
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if fields:
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formats.append((fields[0][0], fields[0][3]))
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return formats
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def get_available_transformations(self):
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return {
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'rotate': {
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'label': _(u'Rotate [degrees]'),
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'arguments': [{'name': 'degrees'}],
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'command_line': u'-rotate %(degrees)d'
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}
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}
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