Python instead of shell for updating citation

package.json

@@ -35,7 +35,7 @@
     "patch": "yarn version --patch --no-commit-hooks --no-git-tag-version && yarn update-citation && yarn fyarn prebuild",
     "minor": "yarn version --minor --no-commit-hooks --no-git-tag-version && yarn update-citation && yarn fyarn prebuild",
     "major": "yarn version --major --no-commit-hooks --no-git-tag-version && yarn update-citation && yarn fyarn prebuild",
-    "update-citation": "$PWD/update-citation.sh"
+    "update-citation": "python $PWD/update_citation.py"
   },
   "private": true,
   "devDependencies": {},

update_citation.py

@@ -0,0 +1,38 @@
+'''Updates the CITATION.cff file:
+    - Sets the date-released to the current date
+    - Sets the version from toplevel package.json
+'''
+
+from datetime import datetime
+import json
+import re
+
+CITATION_FILE = 'CITATION.CFF'
+PACKAGE_FILE = 'package.json'
+VERSION_PATTERN = r'^version:\s+.*$'
+DATE_RELEASED_PATTERN = r'^date-released:.*$'
+VERSION = None
+TODAY = datetime.today().strftime('%Y-%m-%d')
+
+with open(PACKAGE_FILE, 'r') as package_file:
+    package_json = json.load(package_file)
+    try:
+        VERSION = package_json.get('version')
+    except KeyError:
+        print('No version found in root package.json')
+        VERSION = '0.0.0'
+
+with open(CITATION_FILE) as citation_file:
+    citation_in = citation_file.readlines()
+    citation_out = []
+
+    for line in citation_in:
+        if re.match(VERSION_PATTERN, line):
+            citation_out.append(f'version: {VERSION}\n')
+        elif re.match(DATE_RELEASED_PATTERN, line):
+            citation_out.append(f"date-released: '{TODAY}'\n")
+        else:
+            citation_out.append(line)
+
+with open(CITATION_FILE, 'w') as citation_file:
+    citation_file.writelines(citation_out)