commit 58cfd41f438a593f7f3ef4a85e5e76b1d0cb6e9b
Author: Michael Soukup <michael.soukup@greenbird.com>
Date:   Sat Jul 10 08:48:00 2021 +0200

    Working image grid view.

diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
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+__pycache__
+venv
diff --git a/README.md b/README.md
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+++ b/README.md
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+# photocat
+
+Time to unfuck my photo library.
diff --git a/photocat/fs.py b/photocat/fs.py
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+++ b/photocat/fs.py
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+import os
+from toolz import compose
+from toolz.curried import filter, map
+
+
+IMG_EXT = (
+    '.png',
+    '.jpeg',
+    '.jpg',
+    '.svg',
+    '.apng',
+    '.gif',
+    '.webp',
+    '.avif'
+)
+
+def list_images(folder):
+    _, _, files = next(os.walk(folder))
+    return compose(
+        map(lambda f: os.path.join(folder, f)), 
+        filter(lambda f: os.path.splitext(f)[-1].lower() in IMG_EXT)
+    )(files)
diff --git a/photocat/group.py b/photocat/group.py
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+++ b/photocat/group.py
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+from collections import namedtuple
+from itertools import groupby
+from toolz import curry, compose
+from toolz.curried import map, filter
+
+
+
+PhotoGroup = namedtuple(
+    'PhotoGroup',
+    ['name', 'datetimes', 'photos']
+)
+
+
+@curry
+def _group(key, photos):
+    def create_group(k, photos):
+        min_dt = min(photos, key=lambda p: p.datetime).datetime
+        max_dt = max(photos, key=lambda p: p.datetime).datetime
+        name = str(min_dt) + '-' + str(max_dt) # TODO
+        return PhotoGroup(name, (min_dt, max_dt), photos)
+
+    return [
+        create_group(k, list(v))
+        for k, v in groupby(sorted(photos, key=key), key=key)
+    ]
+
+
+photos_by_month = _group(lambda p: p.datetime.month)
+
+
diff --git a/photocat/image.py b/photocat/image.py
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index 0000000..39456f7
--- /dev/null
+++ b/photocat/image.py
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+import io
+from PIL import Image, ExifTags
+
+
+def read(filename, resize=None):
+    """Read and optionally resize an image."""
+    img = Image.open(filename)
+    cur_width, cur_height = img.size
+    if resize:
+        new_width, new_height = resize
+        scale = min(new_height/cur_height, new_width/cur_width)
+        img = img.resize((int(cur_width*scale), int(cur_height*scale)), Image.ANTIALIAS)
+    return img
+
+
+def read_exif(filename):
+    """Read EXIF data."""
+    img = Image.open(filename)
+    exif = img.getexif()
+    if exif is None:
+        raise Exception("No EXIF data for image %s" % filename)
+    return {
+        ExifTags.TAGS[k]: v
+        for k, v in exif.items()
+        if k in ExifTags.TAGS
+    }
+
+
+def to_bytes(img):
+    """Convert image to PNG format and return as byte-string object."""
+    bio = io.BytesIO()
+    img.save(bio, format="PNG")
+    return bio.getvalue()
+
diff --git a/photocat/main.py b/photocat/main.py
new file mode 100644
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--- /dev/null
+++ b/photocat/main.py
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+#import PySimpleGUI as sg
+import PySimpleGUIQt as sg
+import os
+from toolz import compose
+from toolz.curried import map
+
+import fs
+import image
+import photo
+import group
+
+
+MAX_ROWS = 100
+MAX_COLS = 5
+IMG_SIZE = (100, 100)
+
+NA_FILE = os.path.join(
+    os.path.dirname(__file__),
+    'na.jpg'
+)
+NA_IMG = image.to_bytes(image.read(NA_FILE, resize=IMG_SIZE))
+
+
+def main():
+    group_select = [
+        [sg.Text('Input folder'), sg.In(size=(25,1), enable_events=True, key='FOLDER'), sg.FolderBrowse()],
+        [sg.Listbox(values=[], enable_events=True, size=(40,20),key='GROUP LIST')]
+    ]
+    image_view = [
+        [sg.Image(key='PHOTO %d' % (i*MAX_COLS+j), data=NA_IMG, visible=False, enable_events=True) for j in range(MAX_COLS)]
+        for i in range(MAX_ROWS)
+    ]
+    group_view = [
+        [sg.Text('Group: ')],
+        [sg.Column(image_view, scrollable=True, size=(650, 700), element_justification='l')]
+    ]
+
+    layout = [[
+        sg.Column(group_select, element_justification='c'),
+        sg.VSeperator(),
+        sg.Column(group_view, element_justification='c')
+    ]]
+    window = sg.Window('photocat', layout, resizable=True)
+
+    groups = []
+    current_group = None
+    while True:
+        event, values = window.read()
+        if event in (sg.WIN_CLOSED, 'Exit'):
+            break
+        if event == 'FOLDER':
+            # Process input photos into groups
+            groups = compose(
+                group.photos_by_month,
+                map(photo.read_photo), 
+                fs.list_images
+            )(values['FOLDER'])
+            window['GROUP LIST'].update(values=[g.name for g in groups])
+        elif event == 'GROUP LIST':
+            # Find photo group
+            group_name = values['GROUP LIST'][0]
+            print("Selected group: ", group_name)
+            current_group = next(g for g in groups if g.name == group_name)
+            # Assert number of photos
+            n_photos = len(current_group.photos)
+            assert n_photos <= MAX_ROWS*MAX_COLS
+            # Reset image view
+            for idx in range(MAX_ROWS*MAX_COLS):
+                if idx < n_photos:
+                    window['PHOTO %d' % idx].update(data=NA_IMG, visible=True)
+                else:
+                    window['PHOTO %d' % idx].update(visible=False)
+            # Load and display images
+            for idx, p in enumerate(current_group.photos):
+                img_data = image.to_bytes(image.read(p.filename, resize=IMG_SIZE))
+                window['PHOTO %d' % idx].update(data=img_data)
+        elif event.startswith('PHOTO'):
+            idx = int(event.split(' ')[-1])
+            print("Selected photo %d" % idx)
+
+    window.close()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/photocat/na.jpg b/photocat/na.jpg
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index 0000000..06c2d3f
Binary files /dev/null and b/photocat/na.jpg differ
diff --git a/photocat/photo.py b/photocat/photo.py
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+++ b/photocat/photo.py
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+import os
+import datetime
+from collections import namedtuple
+from dateutil import parser
+
+from image import read_exif
+
+
+Photo = namedtuple(
+    'Photo',
+    ['filename', 'datetime', 'exif', 'features', 'selected']
+)
+
+
+def _exif_dt(exif):
+    try:
+        return parser.parse(exif['DateTimeOriginal'])
+    except Exception:
+        return None
+
+def _last_modified_dt(filename):
+    epoch = os.path.getmtime(filename)
+    return datetime.datetime.fromtimestamp(epoch)
+
+
+def read_photo(filename):
+    exif = read_exif(filename)
+    print(filename, exif)
+    dt = _exif_dt(exif) or _last_modified_dt(filename)
+    features = [] # TODO
+    return Photo(filename, dt, exif, features, True)
+