[branch-bender] Add branch bender

Author: woojiahao

branch_bender/.gitmastery-exercise.json

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+{
+  "exercise_name": "branch-bender",
+  "tags": [
+    "git-merge"
+  ],
+  "requires_git": true,
+  "requires_github": false,
+  "base_files": {},
+  "exercise_repo": {
+    "repo_type": "local",
+    "repo_name": "webapp",
+    "repo_title": null,
+    "create_fork": null,
+    "init": true
+  }
+}

branch_bender/README.md

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+# branch-bender
+
+You are building the latest webapp with the coolest features like login, payments, and dashboard.
+
+## Task
+
+You have been working on all of these changes on separate branches and you now want to merge them all into `main`.
+
+### Task 1
+
+Merge the `feature/login` branch into `main` first.
+
+### Task 2
+
+Merge the `feature/dashboard` branch into `main` next.
+
+### Task 3
+
+Merge the `feature/payment` branch into `main` last.
+
+## Final state
+
+The final Git graph (using `git log --oneline --graph`) should look like this:
+
+[![](https://mermaid.ink/img/pako:eNqVkT1vgzAQhv8KuhlRYhMIXlupU6dulZcLPj4UbCPHlkoR_71OmrYRUzvZuve9574WaKwiENAN_tnh1EvTWK0HL83RoWn6pCX0wdHDaLvB_Ko_b0_NyQafaLzImlxH25wNSeG5P1p0aktL_oi9A2zQE86ajP9nm7csSCHGo0HFfSzSJIkE35MmCSJ-FbUYRi9BmjVaMXj7OpsGhHeBUgiTQk9PA3YONYgWx3OMTmjerNXfJmdD19-LIBZ4B1GUeZYXVcmrmtfFnu9SmEGwkmUVyyvOy4Ltq8NuTeHjSsuzkkUbY6wuduxQl3UKnbs0fqtDRpF7tCFOJXgdcaQGb93L17GvN18_AQn5sis?type=png)](https://mermaid.live/edit#pako:eNqVkT1vgzAQhv8KuhlRYhMIXlupU6dulZcLPj4UbCPHlkoR_71OmrYRUzvZuve9574WaKwiENAN_tnh1EvTWK0HL83RoWn6pCX0wdHDaLvB_Ko_b0_NyQafaLzImlxH25wNSeG5P1p0aktL_oi9A2zQE86ajP9nm7csSCHGo0HFfSzSJIkE35MmCSJ-FbUYRi9BmjVaMXj7OpsGhHeBUgiTQk9PA3YONYgWx3OMTmjerNXfJmdD19-LIBZ4B1GUeZYXVcmrmtfFnu9SmEGwkmUVyyvOy4Ltq8NuTeHjSsuzkkUbY6wuduxQl3UKnbs0fqtDRpF7tCFOJXgdcaQGb93L17GvN18_AQn5sis)

branch_bender/__init__.py

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+import subprocess
+from sys import exit
+from typing import List, Optional
+
+__resources__ = {}
+
+
+def run_command(command: List[str], verbose: bool) -> Optional[str]:
+    try:
+        result = subprocess.run(
+            command,
+            capture_output=True,
+            text=True,
+            check=True,
+        )
+        if verbose:
+            print(result.stdout)
+        return result.stdout
+    except subprocess.CalledProcessError as e:
+        if verbose:
+            print(e.stderr)
+        exit(1)
+
+
+def setup(verbose: bool = False):
+    commits_str = run_command(
+        ["git", "log", "--reverse", "--pretty=format:%h"], verbose
+    )
+    assert commits_str is not None
+    first_commit = commits_str.split("\n")[0]
+    tag_name = f"git-mastery-start-{first_commit}"
+    run_command(["git", "tag", tag_name], verbose)

branch_bender/download.py

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+initialization:
+  steps:
+    - type: commit
+      empty: true
+      message: Empty commit
+      id: start

branch_bender/tests/__init__.py

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+from git_autograder import GitAutograderTestLoader
+
+from ..verify import verify
+
+REPOSITORY_NAME = "branch-bender"
+
+loader = GitAutograderTestLoader(__file__, REPOSITORY_NAME, verify)
+
+
+def test():
+    with loader.load("specs/base.yml", "start"):
+        pass

branch_bender/tests/specs/base.yml

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+from git_autograder import (
+    GitAutograderOutput,
+    GitAutograderExercise,
+    GitAutograderStatus,
+)
+
+
+def verify(exercise: GitAutograderExercise) -> GitAutograderOutput:
+    # INSERT YOUR GRADING CODE HERE
+
+    return exercise.to_output([], GitAutograderStatus.SUCCESSFUL)