Report already checked but broken remote links on all pages

nikola/plugins/command/check.py

@@ -173,7 +173,7 @@ def _execute(self, options, args):
             sys.exit(1)
 
     existing_targets = set([])
-    checked_remote_targets = []
+    checked_remote_targets = {}
 
     def analyze(self, task, find_sources=False, check_remote=False):
         rv = False
@@ -219,13 +219,13 @@ def analyze(self, task, find_sources=False, check_remote=False):
                     if parsed.netloc == base_url.netloc:  # absolute URL to self.site
                         continue
                     if target in self.checked_remote_targets:  # already checked this exact target
+                        if self.checked_remote_targets[target] > 399:
+                            self.logger.warn("Broken link in {0}: {1} [Error {2}]".format(filename, target, self.checked_remote_targets[target]))
                         continue
-                    self.checked_remote_targets.append(target)
-
                     # Check the remote link works
                     req_headers = {'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0 (Nikola)'}  # I’m a real boy!
                     resp = requests.head(target, headers=req_headers)
-
+                    self.checked_remote_targets[target] = resp.status_code
                     if resp.status_code > 399:  # Error
                         self.logger.warn("Broken link in {0}: {1} [Error {2}]".format(filename, target, resp.status_code))
                         continue