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#

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# dexif.py - simple EXIF processing for Degal

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# Copyright (C) 2008, Santtu Pajukanta <santtu@pajukanta.fi>

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#

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# This program is free software; you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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# the Free Software Foundation; either version 2 of the License, or

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# (at your option) any later version.

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#

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# This program is distributed in the hope that it will be useful,

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# but WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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# GNU General Public License for more details.

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#

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# You should have received a copy of the GNU General Public License

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# along with this program; if not, write to the

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# Free Software Foundation, Inc.,

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# 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

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#

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from subprocess import Popen, PIPE

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# TODO This should be user configurable

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EXIFTOOL="/usr/bin/exiftool"

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outputTags = [

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# TODO Create date is in a useless format, needs some strptime love

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    ("CreateDate", "Create date"),

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    ("Model", "Camera model"),

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    ("Aperture", "Aperture"),

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    ("ExposureMode", "Exposure mode"),

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    ("ExposureCompensation", "Exposure compensation"),

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    ("ExposureTime", "Exposure time"),

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    ("Flash", "Flash mode"),

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    ("ISO", "ISO"),

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    ("ShootingMode", "Shooting mode"),

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    ("LensType", "Lens type"),

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    ("FocalLength", "Focal length")

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]

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class ExifError(Exception):

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    pass

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def parse_exif(filepath):

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    """parse_exif(filepath :: String) -> [(String, String)]

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    Parse EXIF tags from an image file and return them in a dict.

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    """

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    args = [EXIFTOOL, "-s", "-t", filepath]

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    etproc = Popen(args, stdout = PIPE)

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    output, errors = etproc.communicate()

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    if etproc.returncode < 0:

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        raise ExifError, "exiftool terminated by signal %d" % (-etproc.returnco)

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    elif etproc.returncode > 0:

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        raise ExifError, "exiftool failed with return code %d" % etproc.returncode

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    tags = dict(line.split("\t", 1) for line in output.split("\n") if line)

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    result = [(descr, tags[key]) for (key, descr) in outputTags if tags.has_key(key)]

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    return result