git-workshop/01_essentials/07-reset-vs-revert/setup.ps1

#!/usr/bin/env pwsh

<#
.SYNOPSIS
    Sets up the reset vs revert challenge environment.

.DESCRIPTION
    Creates a Git repository with two branches:
    - local-feature: A private branch where reset should be used
    - shared-feature: A pushed branch where revert should be used
#>

# Remove existing challenge directory if present
if (Test-Path "challenge") {
    Write-Host "Removing existing challenge directory..." -ForegroundColor Yellow
    Remove-Item -Path "challenge" -Recurse -Force
}

# Create challenge directory
Write-Host "Creating challenge environment..." -ForegroundColor Cyan
New-Item -ItemType Directory -Path "challenge" | Out-Null
Set-Location "challenge"

# Initialize git repository
git init | Out-Null
git config user.name "Workshop User" | Out-Null
git config user.email "user@workshop.local" | Out-Null

# Create initial commits on main
$app = @"
class Calculator:
    def add(self, a, b):
        return a + b

    def subtract(self, a, b):
        return a - b
"@

Set-Content -Path "calculator.py" -Value $app
git add calculator.py
git commit -m "Initial calculator implementation" | Out-Null

$readme = @"
# Calculator App

A simple calculator application.
"@

Set-Content -Path "README.md" -Value $readme
git add README.md
git commit -m "Add README" | Out-Null

# Create local-feature branch (private, not shared)
git checkout -b local-feature | Out-Null

$appWithMultiply = @"
class Calculator:
    def add(self, a, b):
        return a + b

    def subtract(self, a, b):
        return a - b

    def multiply(self, a, b):
        return a * b
"@

Set-Content -Path "calculator.py" -Value $appWithMultiply
git add calculator.py
git commit -m "Add multiply function" | Out-Null

# Add a bad commit that should be removed with reset
$appWithBadCode = @"
class Calculator:
    def add(self, a, b):
        return a + b

    def subtract(self, a, b):
        return a - b

    def multiply(self, a, b):
        return a * b

    # BUG: This is broken and should never have been committed!
    def divide(self, a, b):
        # Forgot to check for division by zero
        return a / b  # This will raise ZeroDivisionError for zero!
"@

Set-Content -Path "calculator.py" -Value $appWithBadCode
git add calculator.py
git commit -m "Add broken divide function - DO NOT KEEP" | Out-Null

# Switch back to main for shared-feature branch
git checkout main | Out-Null

# Create shared-feature branch (simulating a pushed/shared branch)
git checkout -b shared-feature | Out-Null

$appWithPower = @"
class Calculator:
    def add(self, a, b):
        return a + b

    def subtract(self, a, b):
        return a - b

    def power(self, a, b):
        return a ** b
"@

Set-Content -Path "calculator.py" -Value $appWithPower
git add calculator.py
git commit -m "Add power function" | Out-Null

# Add a bad commit that should be reverted (not reset)
$appWithBrokenFeature = @"
import math

class Calculator:
    def add(self, a, b):
        return a + b

    def subtract(self, a, b):
        return a - b

    def power(self, a, b):
        return a ** b

    # BUG: This breaks the calculator!
    def square_root(self, a):
        # This implementation is wrong for negative numbers
        return math.sqrt(a)  # Raises ValueError for negative numbers without warning!
"@

Set-Content -Path "calculator.py" -Value $appWithBrokenFeature
git add calculator.py
git commit -m "Add broken feature" | Out-Null

# Add another good commit after the bad one (to show that revert preserves subsequent commits)
$appWithMoreFeatures = @"
import math

class Calculator:
    def add(self, a, b):
        return a + b

    def subtract(self, a, b):
        return a - b

    def power(self, a, b):
        return a ** b

    # BUG: This breaks the calculator!
    def square_root(self, a):
        # This implementation is wrong for negative numbers
        return math.sqrt(a)  # Raises ValueError for negative numbers without warning!

    def modulo(self, a, b):
        return a % b
"@

Set-Content -Path "calculator.py" -Value $appWithMoreFeatures
git add calculator.py
git commit -m "Add modulo function" | Out-Null

# Switch to local-feature for the challenge start
git checkout local-feature | Out-Null

# Return to module directory
Set-Location ..

Write-Host "`n========================================" -ForegroundColor Green
Write-Host "Challenge environment created!" -ForegroundColor Green
Write-Host "========================================" -ForegroundColor Green
Write-Host "`nYou have two branches with bad commits:" -ForegroundColor Cyan
Write-Host "`n1. local-feature (PRIVATE - not shared):" -ForegroundColor Yellow
Write-Host "   - Has a broken divide function commit" -ForegroundColor White
Write-Host "   - Safe to use 'git reset' to remove it" -ForegroundColor Green
Write-Host "`n2. shared-feature (PUBLIC - shared with team):" -ForegroundColor Yellow
Write-Host "   - Has a broken feature commit" -ForegroundColor White
Write-Host "   - Must use 'git revert' to undo it safely" -ForegroundColor Green
Write-Host "`nYour task:" -ForegroundColor Yellow
Write-Host "1. Navigate to the challenge directory: cd challenge" -ForegroundColor White
Write-Host "2. You're on local-feature - view commits: git log --oneline" -ForegroundColor White
Write-Host "3. Remove the bad commit with: git reset --hard HEAD~1" -ForegroundColor White
Write-Host "4. Switch to shared-feature: git checkout shared-feature" -ForegroundColor White
Write-Host "5. Find the 'Add broken feature' commit hash: git log --oneline" -ForegroundColor White
Write-Host "6. Revert it with: git revert <commit-hash>" -ForegroundColor White
Write-Host "`nRun '../verify.ps1' from the challenge directory to check your solution.`n" -ForegroundColor Cyan