A first attempt at converting frontmatter

README.md

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+# Convert nikola frontmatter to zola
+
+Nikola uses HTML comments for frontmatter.
+
+Zola does not.
+
+## Requirements
+
+A somewhat modern Python 3 installation.
+
+## Usage
+
+```
+./nikola_to_zola.py path/to/nikola/page.md > desired/destination/zola/page.md
+```

nikola_to_zola.py

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+#!/usr/bin/env python3
+
+import argparse
+import datetime
+import zoneinfo
+
+SWEDEN = zoneinfo.ZoneInfo("Europe/Stockholm")
+
+parser = argparse.ArgumentParser(
+    prog="nikola_to_zola.py",
+    description="Convert Nikola frontmatter to Zola",
+)
+parser.add_argument("filename")
+
+args = parser.parse_args()
+
+def parse_frontmatter_line(line: str) -> tuple[str, str]:
+    """Parse one line from Nikola frontmatter
+
+    Returns a tuple with (key, value).
+
+    Parses dates into ISO8601 format.
+    """
+    frontmatter = tuple(line.strip()[3:].split(": ", 1))
+    key = frontmatter[0]
+    if len(frontmatter) < 2:
+        val = ""
+    else:
+        val = frontmatter[1]
+
+    # Parse dateformat used in our frontmatter
+    if key == 'date':
+        try:
+            time_format = "%Y-%m-%d %H:%M:%S %Z"
+            val = datetime.datetime.strptime(val, time_format)
+        except ValueError:
+            time_format2 = "%Y-%m-%d %H:%M %Z"
+            val = datetime.datetime.strptime(val, time_format2)
+
+        val = val.astimezone(SWEDEN).isoformat()
+
+    return key, val
+
+
+def read_file():
+    frontmatter = {}
+    text = []
+    with open(args.filename, 'r') as file:
+        reading_frontmatter = True
+        for line in file:
+            if line == "<!--\n":
+                continue
+            if line.startswith("-->"):
+                reading_frontmatter = False
+                continue
+
+            # Strip out teaser comments
+            if line.startswith("<!-- TEASER"):
+                continue
+
+            if reading_frontmatter and line.startswith(".. "):
+                fkey, fval = parse_frontmatter_line(line)
+                frontmatter[fkey] = fval
+            else:
+                text.append(line)
+
+    print("+++")
+    for key, val in frontmatter.items():
+        print(f'{key} = "{val}"')
+    print("+++")
+    print("".join(text).strip())
+
+
+if __name__ == '__main__':
+    read_file()