refactor image code to a BlogImage class, test markdown_template functionality

backblogger.py

@@ -3,28 +3,91 @@ import os
 import json
 from datetime import datetime, date
 import cv2
+from PIL import Image as PILImage
+from PIL.ExifTags import TAGS
 
 def markdown_date(ts):
     d = datetime.fromtimestamp(ts)
     return f"{d.year}-{d.month}-{d.day}"
 
 IMG_WIDTH = 760
-def resize_rename(imgpath, article_number, image_number, destpath=None, target_width=IMG_WIDTH):
+class BlogImage:
-    new_fn = f"article{str(article_number).zfill(2)}_image{str(image_number).zfill(2)}.{imgpath.split('.')[-1]}"
+    def __init__(self, filepath, article_number=None, image_number=None):
-    if destpath is None:
+        self.path = filepath
-        destpath = os.path.join('.', imgpath.replace(os.path.basename(imgpath), ''))
+        self.article_number = article_number
-    dest_fn = os.path.join(destpath, new_fn)
+        self.image_number = image_number
-    img = cv2.imread(imgpath)
+        self._metadata = None
+        self.resized = False
+        self.file_date = os.stat(self.path).st_ctime if self.path else None
+
+    def metadata(self, force_reload=False):
+        if self._metadata and not force_reload: return self._metadata
+        img = PILImage.open(self.path)
+        exif = img.getexif()
+        self._metadata = {TAGS.get(t, t): exif[t] for t in exif}
+        return self._metadata
+
+    def blog_image_name(self):
+        AN = str(self.article_number).zfill(2)
+        IN = str(self.image_number).zfill(2)
+        EXT = os.path.basename(self.path).split('.')[1]
+        return f"article{AN}_image{IN}.{EXT}"
+
+    def resize(self, target_width, dest_fn=None):
+        if dest_fn is None: dest_fn = self.blog_image_name()
+        img = cv2.imread(self.path)
         h, w = img.shape[:2]
-    print(h, w)
         if w <= target_width:
             cv2.imwrite(dest_fn, img)
-        return
+            return dest_fn
         ratio = target_width / float(w)
         new_h = int(h * ratio)
-    print(ratio, target_width, new_h)
         new_img = cv2.resize(img, (target_width, new_h), interpolation=cv2.INTER_AREA)
         cv2.imwrite(dest_fn, new_img)
+        self.resized = True
+
+    def markdown_template(self, template):
+        img_replace = {
+            "{{IMG_FN}}": self.blog_image_name(),
+            "{{IMG_ORIG_FN}}": os.path.basename(self.path),
+            "{{IMG_FILE_DATE}}": markdown_date(self.file_date),
+            "{{IMG_META_DATE}}": self.metadata().get('DateTime', 'No Metadata')
+            }
+        for k in img_replace:
+            template = template.replace(k, img_replace[k])
+        return template
+
+    def serialize(self):
+        return {
+            "path": os.path.basename(self.path),
+            "metadata": self._metadata,
+            "resized": self.resized,
+            "resize_path": self.blog_image_name() if self.resized else '',
+            "date": self.file_date
+            }
+
+    def deserialize(self, data, directory):
+        self.path = os.path.join(directory, data['path'])
+        self._metadata = data['metadata']
+        self.resized = data['resized']
+        if data['date']: os.stat(self.path).st_ctime if self.path else None
+
+    def __repr__(self):
+        return f"<BlogImage path={os.path.basename(self.path)}, article_number={self.article_number}, image_number={self.image_number}>"
+
+    def best_date(self):
+        meta_date = self.metadata().get('DateTime')
+        if meta_date:
+            try:
+                return datetime.strptime(meta_date, '%Y:%m:%d %H:%M:%S').timestamp()
+            except:
+                print(f'DateTime exif failed parsing: {meta_date} ({self.path})')
+        if self.file_date:
+            return self.file_date
+        return -1
+
+    def __lt__(self, other):
+        return self.best_date() < other.best_date()
 
 class BlogScaffold:
     def __init__(self, path):
@@ -32,6 +95,7 @@ class BlogScaffold:
         self.data = { "images": [],
                       "blogfile": None
                     }
+        self.blog_images = []
         # Check the path for backblog metadata
         self.scanned = os.path.exists(os.path.join(self.path, "backblog.json"))
         if not self.scanned:
@@ -42,12 +106,12 @@ class BlogScaffold:
 
     def scan(self):
         _, _, files = next(os.walk(self.path))
+        self.blog_images = []
         for f in files:
-            self.data['images'].append({
+            if f.split('.')[1].lower() not in ('jpg', 'png', 'bmp', 'jpeg'): continue 
-                "path": f,
+            self.blog_images.append(BlogImage(os.path.join(self.path, f)))
-                "date": os.stat(os.path.join(self.path, f)).st_ctime
-                })
         self.scanned = True
+        self.data['images'] = [bi.serialize() for bi in self.blog_images]
         self.save()
             
     def save(self):
@@ -59,23 +123,34 @@ class BlogScaffold:
             yield datetime.fromtimestamp(i['date'])
 
     def markdown_template(self, article_number):
+        if not self.scanned: self.scan()
         replace = {
             "{{TITLE}}": "Backblog basic template about " + self.path,
             "{{SLUG}}": os.path.basename(self.path),
             "{{CATEGORY}}": "category",
             "{{EARLIESTDATE}}": markdown_date(min([i['date'] for i in self.data['images']])),
             "{{TODAY}}": str(date.today()),
-            "{{ARTICLENUM}}": article_number.zfill(2)
+            "{{ARTICLENUM}}": str(article_number).zfill(2)
             }
         txt = None
         with open("template.md", "r") as f:
             txt = f.read()
         img_template = txt.split("%%%")[1]
         img_txt = ""
-        for i, image in enumerate(self.data['images']):
+        for i, image in enumerate(sorted(self.blog_images)):
-            img_fn = resize_rename(image['path'], article_number, i)
+            image.article_number = article_number
-            this_txt = img_template
+            image.image_number = i
-            this_txt.replace("{{IMG_FN}}", img_fn)
+            image.resize(IMG_WIDTH)
+            img_txt += image.markdown_template(img_template)
+        txt = txt.split("%%%")[0] + img_txt + txt.split("%%%")[2]
+        for k in replace:
+            txt = txt.replace(k, replace[k])
+        template_fn = f"{str(article_number).zfill(2)}_{os.path.basename(self.path)}.md"
+        render_template_fn = os.path.join(self.path, template_fn)
+        with open(render_template_fn, "w") as f:
+            f.write(txt)
+        self.data['blogfile'] = template_fn
+        
 
     def __repr__(self):
         if not self.scanned:
@@ -86,5 +161,9 @@ if __name__ == '__main__':
     subdirs = os.listdir('..')
     # don't scan program's directory
     subdirs.remove(os.path.basename(os.path.abspath('.')))
+    #os.chdir('..')
     scaffolds = [BlogScaffold(os.path.join('..', sd)) for sd in subdirs]
 
+    scaffolds.sort(key = lambda s: s.blog_images[-1], reverse=True)
+    for s in scaffolds:
+        print(f"{os.path.basename(s.path)} - earliest {markdown_date(s.blog_images[0].best_date())} - latest {markdown_date(s.blog_images[-1].best_date())}")