Merge pull request #430 from nvbn/429-apt-invalid-operation

#429: Add `apt_invalid_operation` rule

thefuck/rules/apt_invalid_operation.py

@@ -0,0 +1,53 @@
+import subprocess
+from thefuck.specific.sudo import sudo_support
+from thefuck.utils import for_app, eager, replace_command
+
+
+@for_app('apt', 'apt-get', 'apt-cache')
+@sudo_support
+def match(command):
+    return 'E: Invalid operation' in command.stderr
+
+
+@eager
+def _parse_apt_operations(help_text_lines):
+    is_commands_list = False
+    for line in help_text_lines:
+        line = line.decode().strip()
+        if is_commands_list and line:
+            yield line.split()[0]
+        elif line.startswith('Basic commands:'):
+            is_commands_list = True
+
+
+@eager
+def _parse_apt_get_and_cache_operations(help_text_lines):
+    is_commands_list = False
+    for line in help_text_lines:
+        line = line.decode().strip()
+        if is_commands_list:
+            if not line:
+                return
+
+            yield line.split()[0]
+        elif line.startswith('Commands:'):
+            is_commands_list = True
+
+
+def _get_operations(app):
+    proc = subprocess.Popen([app, '--help'],
+                            stdout=subprocess.PIPE,
+                            stderr=subprocess.PIPE)
+    lines = proc.stdout.readlines()
+
+    if app == 'apt':
+        return _parse_apt_operations(lines)
+    else:
+        return _parse_apt_get_and_cache_operations(lines)
+
+
+@sudo_support
+def get_new_command(command):
+    invalid_operation = command.stderr.split()[-1]
+    operations = _get_operations(command.script_parts[0])
+    return replace_command(command, invalid_operation, operations)