NPM automation (#36)

Initial support for NPM Automation. This isn't widely used, since most NPM projects
will use git tags as well, but helpful for a few projects.

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

* Fix fstrings and remove unused imports

* Fix the merge of product config with default config in npm.py and pypi.py

If product config is first, default config overrides product config.

* Simplify npm.py

Co-authored-by: Nemo <me@captnemo.in>
Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
Co-authored-by: Marc Wrobel <marc.wrobel@gmail.com>

src/npm.py

@@ -0,0 +1,68 @@
+from glob import glob
+import os
+import re
+import sys
+import json
+import frontmatter
+import urllib.request
+
+DEFAULT_TAG_TEMPLATE = (
+    "{{major}}{% if minor %}.{{minor}}{% if patch %}.{{patch}}{%endif%}{%endif%}"
+)
+REGEX = r"^(?:(\d+\.(?:\d+\.)*\d+))$"
+
+
+def fetch_releases(npm_id, regex):
+    releases = {}
+
+    if not isinstance(regex, list):
+        regex = [regex]
+
+    url = f"https://registry.npmjs.org/{npm_id}"
+    with urllib.request.urlopen(url, data=None, timeout=5) as response:
+        data = json.loads(response.read().decode("utf-8"))
+        for version in data["time"]:
+            matches = False
+            for r in regex:
+                if re.match(r, version):
+                    matches = True
+
+            release_datetime = data["time"][version]
+            if matches and release_datetime:
+                releases[version] = release_datetime.split("T")[0]
+                print(f"{version}: {releases[version]}")
+
+    return releases
+
+
+def update_releases(product_filter=None):
+    for product_file in glob("website/products/*.md"):
+        product_name = os.path.splitext(os.path.basename(product_file))[0]
+        if product_filter and product_name != product_filter:
+            continue
+
+        with open(product_file, "r") as f:
+            data = frontmatter.load(f)
+            if "auto" in data:
+                for config in data["auto"]:
+                    for key, d_id in config.items():
+                        if key == "npm":
+                            update_product(product_name, config)
+
+
+def update_product(product_name, config):
+    if "npm" in config:
+        print(f"::group::{product_name}")
+        config = {"regex": REGEX} | config
+        r = fetch_releases(config["npm"], config["regex"])
+        print("::endgroup::")
+
+        with open(f"releases/{product_name}.json", "w") as f:
+            f.write(json.dumps(r, indent=2))
+
+
+if __name__ == "__main__":
+    if len(sys.argv) > 1:
+        update_releases(sys.argv[1])
+    else:
+        update_releases()