Add helper for making image sets

bin/img-srcset

+#!/usr/bin/env python3
+
+"""
+Generate srcset images so we can do something like:
+        <img src="img.png" width="4000" height="3000" alt="" srcset="img.png 4000w,
+        img-2000x1500.png 2000w,
+        img-1024x768.png 1024w,
+        img-768x576.png 768w,
+        img-300.png 225w"
+        sizes = "100vw">
+"""
+  
+import os
+from PIL import Image
+import sys
+
+def get_html_dir(curr:str="", token:str="content"):
+    curr = curr or os.getcwd()
+    ret = []
+    while curr != '/':
+        curr, child = os.path.split(curr)
+        if child == token:
+            break
+        ret.append(child)
+    ret.reverse()
+    return '/' + '/'.join(ret)
+
+    while current_dir != '/':
+        dir_name = os.path.basename(current_dir)
+        if target_string in dir_name:
+            break
+        current_dir = os.path.dirname(current_dir)
+
+in_fname = sys.argv[1]
+html_dir = get_html_dir()
+fname_parts = os.path.splitext(in_fname)
+image = Image.open(in_fname)
+widths = (4000,2000,1024,768,300)
+
+## Write files of different widths
+print(f'<img src="{html_dir}/{in_fname}"')
+print(f'    width="{image.width}" height="{image.height}" alt=""')
+print(f'    srcset="{html_dir}/{in_fname} {image.width}w,')
+for width in widths:
+    if width >= image.width:
+        continue
+    height = int((width * image.height) / image.width)
+    resized_image = image.resize((width, height))
+
+    ## Write resized image
+    out_fname = f"{fname_parts[0]}-{width}x{height}{fname_parts[1]}"
+    resized_image.save(out_fname)
+
+    ## Print html snippet
+    sys.stdout.write(f'    {html_dir}/{out_fname} {width}w')
+    if width == widths[-1]:
+        print('" ')
+    else:
+        print(', ')
+print('    sizes = "100vw">')
+

requirements-dev.txt

@@ -3,3 +3,4 @@ psutil
 bs4
 pytest-xprocess
 feedparser
+types-Pillow

requirements.txt

 pelican[markdown]
 pelican-search
+Pillow