Convert from old categories to tags

import sys
import yaml

with open(sys.argv[1]) as fp:
    data = fp.read()

if not data.find("---") == 0:
    # no head
    print("NO YAML HEAD FOUND")
    sys.exit(-1)

data = data[3:]
head_end = data.find("---")

head = data[0:head_end]
data = data[head_end+3:]

metadata = yaml.safe_load(head)

cats = metadata.pop('categories', None)
if cats != None:
    if type(cats) == list:
        tags = cats
    elif type(cats) == str:
        tags = cats.split()

    tags = list(map(lambda t: t.lower(), tags))

    metadata["tags"] = ", ".join(tags)
    new_data = f"---\n{yaml.dump(metadata, default_flow_style=False)}---{data}"
    # write it
    print(f"coverted: categories to tags: {tags} - {sys.argv[1]}")
    with open(sys.argv[1], "w") as fp:
        fp.write(new_data)
    sys.exit(0)

if not metadata.get("tags", None):
    metadata["tags"] = "untagged"
    new_data = f"---\n{yaml.dump(metadata, default_flow_style=False)}---{data}"
    print(f"untagged: {sys.argv[1]}")
    # write it
    with open(sys.argv[1], "w") as fp:
        fp.write(new_data)
    sys.exit(0)

print("No changes needed")

blog/2012-11-21-netbsd-chronicles.markdown

@@ -4,9 +4,9 @@ comments: true
 date: 2012-11-21 21:45:00
 layout: post
 slug: netbsd-chronicles
+tags: netbsd
 title: NetBSD Chronicles.
 wordpress_id: 169330104
-categories: NetBSD
 ---
 
 To be frank I wasn't doing much for almost an year, got lazy as one can ever be. Today was the day to break it. Got a little push do something and I got down to do it. I was looking at BSD development for a long time, and thought this is the best time to get involved. I am a total noob at BSD, I never really used one. So it was challenging when I started to install NetBSD into an old Comapq nx6120 that was lying around. I know anyone could get to the root shell easily, with help from brilliant click and go installers, configuring and customizing was the real problem.