nvbn#942: Improve git_branch_0flag rule - with a new name

Author: scorphus

README.md

@@ -231,7 +231,7 @@ following rules are enabled by default:
 * `git_branch_delete_checked_out` – changes `git branch -d` to `git checkout master && git branch -D` when trying to delete a checked out branch;
 * `git_branch_exists` – offers `git branch -d foo`, `git branch -D foo` or `git checkout foo` when creating a branch that already exists;
 * `git_branch_list` – catches `git branch list` in place of `git branch` and removes created branch;
-* `git_branch_flag_0_to_flag_dash_v` – undoes `git branch 0v` and runs `git branch -v` in its place;
+* `git_branch_0flag` – fixes commands such as `git branch 0v` and `git branch 0r` removing the created branch;
 * `git_checkout` – fixes branch name or creates new branch;
 * `git_clone_git_clone` – replaces `git clone git clone ...` with `git clone ...`
 * `git_commit_amend` – offers `git commit --amend` after previous commit;

tests/rules/test_git_branch_0flag.py

@@ -0,0 +1,70 @@
+import pytest
+
+from thefuck.rules.git_branch_0flag import get_new_command, match
+from thefuck.types import Command
+
+
+@pytest.fixture
+def output_branch_exists():
+    return "fatal: A branch named 'bar' already exists."
+
+
+@pytest.mark.parametrize(
+    "script",
+    [
+        "git branch 0a",
+        "git branch 0d",
+        "git branch 0f",
+        "git branch 0r",
+        "git branch 0v",
+        "git branch 0d foo",
+        "git branch 0D foo",
+    ],
+)
+def test_match(script, output_branch_exists):
+    assert match(Command(script, output_branch_exists))
+
+
+@pytest.mark.parametrize(
+    "script",
+    [
+        "git branch -a",
+        "git branch -r",
+        "git branch -v",
+        "git branch -d foo",
+        "git branch -D foo",
+    ],
+)
+def test_not_match(script, output_branch_exists):
+    assert not match(Command(script, ""))
+
+
+@pytest.mark.parametrize(
+    "script, new_command",
+    [
+        ("git branch 0a", "git branch -D 0a && git branch -a"),
+        ("git branch 0v", "git branch -D 0v && git branch -v"),
+        ("git branch 0d foo", "git branch -D 0d && git branch -d foo"),
+        ("git branch 0D foo", "git branch -D 0D && git branch -D foo"),
+        ("git branch 0l 'maint-*'", "git branch -D 0l && git branch -l 'maint-*'"),
+        ("git branch 0u upstream", "git branch -D 0u && git branch -u upstream"),
+    ],
+)
+def test_get_new_command_branch_exists(script, output_branch_exists, new_command):
+    assert get_new_command(Command(script, output_branch_exists)) == new_command
+
+
+@pytest.fixture
+def output_not_valid_object():
+    return "fatal: Not a valid object name: 'bar'."
+
+
+@pytest.mark.parametrize(
+    "script, new_command",
+    [
+        ("git branch 0l 'maint-*'", "git branch -l 'maint-*'"),
+        ("git branch 0u upstream", "git branch -u upstream"),
+    ],
+)
+def test_get_new_command_not_valid_object(script, output_not_valid_object, new_command):
+    assert get_new_command(Command(script, output_not_valid_object)) == new_command

tests/rules/test_git_branch_flag_0_to_flag_dash_v.py

@@ -0,0 +1,24 @@
+from thefuck.shells import shell
+from thefuck.specific.git import git_support
+from thefuck.utils import memoize
+
+
+@memoize
+def first_0flag(script_parts):
+    return next((p for p in script_parts if len(p) == 2 and p.startswith("0")), None)
+
+
+@git_support
+def match(command):
+    return command.script_parts[1] == "branch" and first_0flag(command.script_parts)
+
+
+@git_support
+def get_new_command(command):
+    branch_name = first_0flag(command.script_parts)
+    fixed_flag = branch_name.replace("0", "-")
+    fixed_script = command.script.replace(branch_name, fixed_flag)
+    if "A branch named '" in command.output and "' already exists." in command.output:
+        delete_branch = u"git branch -D {}".format(branch_name)
+        return shell.and_(delete_branch, fixed_script)
+    return fixed_script