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pelican/plugins/exif.py

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+#coding=utf-8
+"""
+    Copyright (c) Jonathan Gonse <jonathan.gonse@gmail.com>
+
+Photo blog plugin for Pelican
+==========================
+
+This plugin allows you to define an Album variable to the article's context, making the photos in that folder
+and their exif info available to use from within your theme's templates.
+
+Settings:
+---------
+
+You do not need to add anything in your settings file.
+
+Article metadata:
+------------------
+
+for rst file:
+
+:album: pictures/lol
+
+for markdown file:
+
+Album: pictures/lol
+
+Usage
+-----
+    in your template just write a for in jinja2 syntax against the
+    article.pic_exif variable.
+
+      {% if article.pic_exif %}
+
+      <div id="album_container">
+          <div id="slide_container">
+              {% for fn in article.pic_exif %}
+                  <img src="{{ fn }}">
+                  <pre>
+                      {% for exif_str in article.pic_exif[fn] %}
+                      <li>{{ exif_str }}</li>
+                      {% endfor %}
+                  </pre>
+              {% endfor %}
+          </div>
+      </div>
+      {% endif %}
+"""
+
+import logging
+import os
+import lib_exif_py as exif
+#get it from https://github.com/ianare/exif-py
+from pelican import signals
+
+logger = logging.getLogger(__name__)
+
+def add_pic_info(generator, metadata):
+    """
+    Add a dict of file_path : file_exif_info to metadata['pic_exif']
+    """
+
+    if 'album' in metadata.keys():
+        abspath = os.path.join(generator.path, metadata['album'])
+        metadata['pic_paths'] = get_files(abspath)
+        metadata['pic_exif'] = {}
+        for filename in metadata['pic_paths']:
+            file_path = os.path.join('static',metadata['album'],os.path.basename(filename))
+            metadata['pic_exif'][file_path] = ""
+            try:
+                file=open(filename, 'rb')
+            except:
+                logger.debug("'%s' is unreadable\n"%filename)
+                continue
+            # get the tags
+            data = exif.process_file(file)
+            if not data:
+                logger.debug('No EXIF information found')
+                continue
+            x=data.keys()
+            x.sort()
+            tmp_str = []
+            for i in x:
+                if i in ('JPEGThumbnail', 'TIFFThumbnail'):
+                    continue
+                try:
+                    if i in ('Image Make','Image Model','Image Software','EXIF ApertureValue','EXIF DateTimeOriginal','EXIF DateTimeDigitized','EXIF ExposureTime','EXIF FNumber','EXIF ISOSpeedRatings','EXIF ExposureMode','EXIF ExposureBiasValue','EXIF Flash') :
+                        logger.debug('%s: %s' %\
+                              (i.replace("EXIF ","").replace("Image ",""), data[i].printable))
+                        tmp_str.append(('%s: %s' %(i.replace("EXIF ","").replace("Image ",""), data[i].printable)))
+                except:
+                    logger.debug('error', i, '"', data[i], '"')
+            file_path = os.path.join('static',metadata['album'],os.path.basename(filename))
+            metadata['pic_exif'][file_path] = tmp_str
+        logger.debug('get exif info:' + metadata['pic_exif'])
+
+def get_files(path):
+    """Return a list of files to use, based on rules
+
+    :param path: the path to search the file on
+    :param exclude: the list of path to exclude
+    """
+    files = []
+
+    try:
+        iter = os.walk(path, followlinks=True)
+    except TypeError:  # python 2.5 does not support followlinks
+        iter = os.walk(path)
+
+    for root, dirs, temp_files in iter:
+        files.extend([os.sep.join((root, f)) for f in temp_files])
+    return files
+
+def register():
+    signals.article_generate_context.connect(add_pic_info)