#N/A: Add port_already_in_use rule

thefuck/rules/port_already_in_use.py

@@ -0,0 +1,39 @@
+import re
+from subprocess import Popen, PIPE
+from thefuck.utils import memoize
+from thefuck.shells import shell
+
+patterns = [r"bind on address \('.*', (?P<port>\d+)\)",
+            r'Unable to bind [^ ]*:(?P<port>\d+)',
+            r"can't listen on port (?P<port>\d+)",
+            r'listen EADDRINUSE [^ ]*:(?P<port>\d+)']
+
+
+@memoize
+def _get_pid_by_port(port):
+    proc = Popen(['lsof', '-i', ':{}'.format(port)], stdout=PIPE)
+    lines = proc.stdout.read().decode().split('\n')
+    if len(lines) > 1:
+        return lines[1].split()[1]
+    else:
+        return None
+
+
+@memoize
+def _get_used_port(command):
+    for pattern in patterns:
+        matched = (re.search(pattern, command.stderr)
+                   or re.search(pattern, command.stdout))
+        if matched:
+            return matched.group('port')
+
+
+def match(command):
+    port = _get_used_port(command)
+    return port and _get_pid_by_port(port)
+
+
+def get_new_command(command):
+    port = _get_used_port(command)
+    pid = _get_pid_by_port(port)
+    return shell.and_(u'kill {}'.format(pid), command.script)