Lint S014: Only warn about -W when used for LSF (#6551)

Author: wxtim

changes.d/6551.fix.md

@@ -0,0 +1 @@
+Fix bug in `cylc lint` S014 where it warned about use of legitimate `-W` directive for PBS.

cylc/flow/scripts/lint.py

@@ -189,15 +189,20 @@ def get_wallclock_directives():
             'TIME_LIMIT_DIRECTIVE',
             None
         )
-        if directive:
-            directives[module.name] = directive
+        if directive and directive == '-W':
+            # LSF directive -W needs to have a particular form to
+            # avoid matching PBS directive -W:
+            directives[module.name] = re.compile(
+                r'^-W\s*=?\s*(\d+:)?\d+[^/]*$')
+        elif directive:
+            directives[module.name] = re.compile(rf'^{directive}.*')
     return directives
 
 
 WALLCLOCK_DIRECTIVES = get_wallclock_directives()
 
 
-def check_wallclock_directives(line: str) -> Union[Dict[str, str], bool]:
+def check_wallclock_directives(line: str) -> Dict[str, str]:
     """Check for job runner specific directives
     equivalent to exection time limit.
 
@@ -209,11 +214,21 @@ def check_wallclock_directives(line: str) -> Union[Dict[str, str], bool]:
         >>> this = check_wallclock_directives
         >>> this('    -W 42:22')
         {'directive': '-W 42:22'}
+        >>> this('    -W 42:22/hostname')  # Legit LSF use case
+        {}
+        >>> this('    -W 422')
+        {'directive': '-W 422'}
+        >>> this('    -W foo=42')  # Legit PBS use case.
+        {}
+        >>> this('    -W foo="Hello World"')  # Legit PBS use case.
+        {}
+        >>> this('    -l walltime whatever')
+        {'directive': '-l walltime whatever'}
     """
     for directive in set(WALLCLOCK_DIRECTIVES.values()):
-        if line.strip().startswith(directive):
+        if directive.findall(line.strip()):
             return {'directive': line.strip()}
-    return False
+    return {}
 
 
 def check_jinja2_no_shebang(