wrap yaml into main to avoid it auto-running on validate through the import

yaml_to_html.py

@@ -16,11 +16,14 @@ def linkify_cell(value):
 
     def repl(m):
         url = m.group(1)
-        href = url if url.lower().startswith(("http://", "https://")) else f"https://{url}"
+        href = (
+            url if url.lower().startswith(("http://", "https://")) else f"https://{url}"
+        )
         return f'<a href="{href}">{url}</a>'
 
     return URL_RE.sub(repl, value)
 
+
 yaml_file = "problems.yaml"
 
 html_dir = "docs/"
@@ -31,9 +34,6 @@ def repl(m):
 html_index = f"{html_dir}index.html"
 html_table_template = f"{html_dir}table_template.html"
 
-# Load data
-with open(yaml_file) as yaml_input:
-    data = pd.json_normalize(yaml.safe_load(yaml_input))
 
 # Choose desired columns
 all_columns = False
@@ -51,55 +51,61 @@ def repl(m):
                    "reference",
                    "implementation"]
 
-if all_columns is False:
-    columns = default_columns
-    data = data[columns]
-
-data = data.map(linkify_cell)
-
-# Generate plain table
-table = data.to_html(render_links=False,
-                     escape=False,  # Don't escape HTML in cells (to allow links)
-                     index=False,
-                     table_id="problems",
-                     classes=["display compact", "display", "styled-table"],  # Set display style
-                     border=0,
-                     na_rep="")  # Leave NaN cells empty
-
-# Add footer to facilitate individual column search
-idx = table.index('</table>')
-final_table = table[:idx] + "<tfoot><tr>" + " ".join(["<th>"+ i +"</th>" for i in data.columns])+"</tr> </tfoot>" + table[idx:]
-
-default_hidden_columns = {"textual description", "reference", "implementation"}
-
-column_toggles = "".join(
-    [
-        (
-            f'<label class="column-chip">'
-            f'<input class="col-toggle" type="checkbox" data-column="{i}"'
-            f'{" checked" if col not in default_hidden_columns else ""}>'
-            f'<span>{escape(col)}</span>'
-            f'</label>'
-        )
-        for i, col in enumerate(data.columns)
-    ]
-)
-
-with open(html_table_template, encoding="utf-8") as template_file:
-    table_template = template_file.read()
-
-table_markup = (
-    table_template
-    .replace("__COLUMN_TOGGLES__", column_toggles)
-    .replace("__TABLE__", final_table)
-)
-
-# Write table to file
-with open(html_table, "w", encoding="utf-8") as table_file:
-    table_file.write(table_markup)
-
-# Merge table and scripts into HTML page
-with open(html_index, "wb") as output_file:
-    for part_path in [html_header, html_table, html_scripts, html_footer]:
-        with open(part_path, "rb") as part_file:
-            shutil.copyfileobj(part_file, output_file)
+if __name__ == "__main__":
+    # Load data
+    with open(yaml_file) as yaml_input:
+      data = pd.json_normalize(yaml.safe_load(yaml_input))
+
+
+    if all_columns is False:
+      columns = default_columns
+      data = data[columns]
+
+    data = data.map(linkify_cell)
+
+    # Generate plain table
+    table = data.to_html(render_links=False,
+                       escape=False,  # Don't escape HTML in cells (to allow links)
+                       index=False,
+                       table_id="problems",
+                       classes=["display compact", "display", "styled-table"],  # Set display style
+                       border=0,
+                       na_rep="")  # Leave NaN cells empty
+
+    # Add footer to facilitate individual column search
+    idx = table.index('</table>')
+    final_table = table[:idx] + "<tfoot><tr>" + " ".join(["<th>"+ i +"</th>" for i in data.columns])+"</tr> </tfoot>" + table[idx:]
+
+    default_hidden_columns = {"textual description", "reference", "implementation"}
+
+    column_toggles = "".join(
+      [
+          (
+              f'<label class="column-chip">'
+              f'<input class="col-toggle" type="checkbox" data-column="{i}"'
+              f'{" checked" if col not in default_hidden_columns else ""}>'
+              f'<span>{escape(col)}</span>'
+              f'</label>'
+          )
+          for i, col in enumerate(data.columns)
+      ]
+    )
+
+    with open(html_table_template, encoding="utf-8") as template_file:
+      table_template = template_file.read()
+
+    table_markup = (
+      table_template
+      .replace("__COLUMN_TOGGLES__", column_toggles)
+      .replace("__TABLE__", final_table)
+    )
+
+    # Write table to file
+    with open(html_table, "w", encoding="utf-8") as table_file:
+      table_file.write(table_markup)
+
+    # Merge table and scripts into HTML page
+    with open(html_index, "wb") as output_file:
+      for part_path in [html_header, html_table, html_scripts, html_footer]:
+          with open(part_path, "rb") as part_file:
+              shutil.copyfileobj(part_file, output_file)