Merge pull request #476 from scorphus/git-help-aliased

#N/A: Add new `git_help_aliased` rule

README.md

@@ -161,6 +161,7 @@ using the matched rule and runs it. Rules enabled by default are as follows:
 * `git_checkout` – fixes branch name or creates new branch;
 * `git_diff_staged` – adds `--staged` to previous `git diff` with unexpected output;
 * `git_fix_stash` – fixes `git stash` commands (misspelled subcommand and missing `save`);
+* `git_help_aliased` &ndash; fixes `git help <alias>` commands replacing <alias> with the aliased command;
 * `git_not_command` &ndash; fixes wrong git commands like `git brnch`;
 * `git_pull` &ndash; sets upstream before executing previous `git pull`;
 * `git_pull_clone` &ndash; clones instead of pulling when the repo does not exist;

tests/rules/test_git_help_aliased.py

@@ -0,0 +1,24 @@
+import pytest
+from thefuck.rules.git_help_aliased import match, get_new_command
+from tests.utils import Command
+
+
+@pytest.mark.parametrize('script, stdout', [
+    ('git help st', "`git st' is aliased to `status'"),
+    ('git help ds', "`git ds' is aliased to `diff --staged'")])
+def test_match(script, stdout):
+    assert match(Command(script=script, stdout=stdout))
+
+
+@pytest.mark.parametrize('script, stdout', [
+    ('git help status', "GIT-STATUS(1)...Git Manual...GIT-STATUS(1)"),
+    ('git help diff', "GIT-DIFF(1)...Git Manual...GIT-DIFF(1)")])
+def test_not_match(script, stdout):
+    assert not match(Command(script=script, stdout=stdout))
+
+
+@pytest.mark.parametrize('script, stdout, new_command', [
+    ('git help st', "`git st' is aliased to `status'", 'git help status'),
+    ('git help ds', "`git ds' is aliased to `diff --staged'", 'git help diff')])
+def test_get_new_command(script, stdout, new_command):
+    assert get_new_command(Command(script=script, stdout=stdout)) == new_command

thefuck/rules/git_help_aliased.py

@@ -0,0 +1,12 @@
+from thefuck.specific.git import git_support
+
+
+@git_support
+def match(command):
+    return 'help' in command.script and ' is aliased to ' in command.stdout
+
+
+@git_support
+def get_new_command(command):
+    aliased = command.stdout.split('`', 2)[2].split("'", 1)[0].split(' ', 1)[0]
+    return 'git help {}'.format(aliased)