Make no_command work only when apt available

thefuck/rules/no_command_apt.py

@@ -1,19 +1,23 @@
 from subprocess import Popen, PIPE
 import re
+from thefuck.utils import which
+
+
+def _get_bin(settings):
+    return getattr(settings, 'command_not_found', '/usr/lib/command-not-found')
 
 
 def _get_output(command, settings):
     name = command.script.split(' ')[command.script.startswith('sudo')]
-    check_script = '{} {}'.format(getattr(settings, 'command_not_found',
-                                          '/usr/lib/command-not-found'),
-                                  name)
+    check_script = '{} {}'.format(_get_bin(settings), name)
     result = Popen(check_script, shell=True, stderr=PIPE)
     return result.stderr.read().decode()
 
 
 def match(command, settings):
-    output = _get_output(command, settings)
-    return "No command" in output and "from package" in output
+    if which('apt-get') and which(_get_bin(settings)):
+        output = _get_output(command, settings)
+        return "No command" in output and "from package" in output
 
 
 def get_new_command(command, settings):

thefuck/utils.py

@@ -0,0 +1,19 @@
+import os
+
+
+def which(program):
+    def is_exe(fpath):
+        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
+
+    fpath, fname = os.path.split(program)
+    if fpath:
+        if is_exe(program):
+            return program
+    else:
+        for path in os.environ["PATH"].split(os.pathsep):
+            path = path.strip('"')
+            exe_file = os.path.join(path, program)
+            if is_exe(exe_file):
+                return exe_file
+
+    return None