add git-lfs support (#1056)

* add mistyping support for git lfs

* add the rule

* fix flake8

* flake8

* add to readme

* use fixtures and regex

* get rid of additional matched strings

README.md

@@ -214,6 +214,7 @@ following rules are enabled by default:
 * `git_fix_stash` – fixes `git stash` commands (misspelled subcommand and missing `save`);
 * `git_flag_after_filename` – fixes `fatal: bad flag '...' after filename`
 * `git_help_aliased` &ndash; fixes `git help <alias>` commands replacing <alias> with the aliased command;
+* `git_lfs_mistype` &ndash; fixes mistyped `git lfs <command>` commands;
 * `git_merge` &ndash; adds remote to branch names;
 * `git_merge_unrelated` &ndash; adds `--allow-unrelated-histories` when required
 * `git_not_command` &ndash; fixes wrong git commands like `git brnch`;

tests/rules/test_git_lfs_mistype.py

@@ -0,0 +1,29 @@
+import pytest
+
+from thefuck.rules.git_lfs_mistype import match, get_new_command
+from thefuck.types import Command
+
+
+@pytest.fixture
+def mistype_response():
+    return """
+Error: unknown command "evn" for "git-lfs"
+
+Did you mean this?
+        env
+        ext
+
+Run 'git-lfs --help' for usage.
+    """
+
+
+def test_match(mistype_response):
+    assert match(Command('git lfs evn', mistype_response))
+    err_response = 'bash: git: command not found'
+    assert not match(Command('git lfs env', err_response))
+    assert not match(Command('docker lfs env', mistype_response))
+
+
+def test_get_new_command(mistype_response):
+    assert (get_new_command(Command('git lfs evn', mistype_response))
+            == ['git lfs env', 'git lfs ext'])

thefuck/rules/git_lfs_mistype.py

@@ -0,0 +1,18 @@
+import re
+from thefuck.utils import get_all_matched_commands, replace_command
+from thefuck.specific.git import git_support
+
+
+@git_support
+def match(command):
+    '''
+    Match a mistyped command
+    '''
+    return 'lfs' in command.script and 'Did you mean this?' in command.output
+
+
+@git_support
+def get_new_command(command):
+    broken_cmd = re.findall(r'Error: unknown command "([^"]*)" for "git-lfs"', command.output)[0]
+    matched = get_all_matched_commands(command.output, ['Did you mean', ' for usage.'])
+    return replace_command(command, broken_cmd, matched)