Add clean option for src.web.main

"-c" flag to clean out files generated by src.web.precomp before running
the app. Warns user if skip-precompute is also called.

src/web/main.py

@@ -3,7 +3,7 @@
 import logging
 
 from src.web.app import app
-from src.web.precomp import generate_pages
+from src.web.precomp import clean_pages, generate_pages
 
 
 def main() -> None:
@@ -19,8 +19,16 @@ def main() -> None:
                         help="Port where the app is run.")
     parser.add_argument("-s", "--skip-precompute", action="store_true",
                         help="Use existing static pages instead of re-computing them.")
+    parser.add_argument("-c", "--clean", action="store_true",
+                        help="Cleans prior generated pages prior to running app.")
     args = parser.parse_args()
 
+    if args.clean:
+        clean_pages()
+    if args.clean and args.skip_precompute:
+        logger.warning("Cleaned pages but not rebuilding! Consider not using "
+                       "--skip-precompute with --clean!")
+
     if not args.skip_precompute:
         generate_pages()
 

src/web/precomp.py

@@ -6,18 +6,23 @@
 from src.web.app import app
 
 
+def clean_pages() -> None:
+    """Tries deleting all generated pages."""
+    try:
+        shutil.rmtree("src/web/static/pages")
+        logger.debug("Removed src/web/static/pages")
+    except FileNotFoundError:
+        logger.debug("src/web/static/pages not found and hence not removed.")
+
+
 def generate_pages() -> None:
     years = ["2122", "2223", "2324", "2425"]
     semesters = ["1", "2"]
     student_types = ["ug", "gd"]
 
     combinations = itertools.product(years, semesters, student_types)
 
-    try:
-        shutil.rmtree("src/web/static/pages")
-    except FileNotFoundError:
-        pass
-
+    logger.info("Generating all pages...")
     for year, semester, student_type in combinations:
         generate_html(year, semester, student_type)