Dotfiles

• macOS and Linux development environment
• One-command setup, safe to re-run
• Version-controlled and portable across machines

Installation

git clone https://github.com/cassmtnr/dotfiles.git ~/dotfiles
cd ~/dotfiles

# Review .brewfile, .aliases, .functions, and .defaults before running
# to customize packages and preferences for your setup.
./install.sh

Idempotent — safe to run multiple times.

Updating

./update.sh              # Refresh symlinks only
./update.sh -p           # Also update Homebrew packages
./update.sh -d           # Also re-apply macOS defaults
./update.sh -a           # All of the above

Project Structure

dotfiles/
├── install.sh                 # Full installation
├── update.sh                  # Lightweight update (symlinks + optional packages/defaults)
├── .utils.sh                  # Shared utilities (OS detection, logging, symlinks, packages)
├── .brewfile                  # Homebrew packages (45+)
├── .editorconfig              # Cross-editor coding standards
├── .zshrc                     # Shell configuration
├── .zshenv                    # Environment variables
├── .functions                 # Utility functions (mkd, killport, extract, weather)
├── .aliases                   # Shell aliases (25+)
├── .ssh-agent                 # SSH agent management
├── .completion                # Shell completions
├── .starship                  # Starship prompt configuration
├── .defaults                  # macOS system preferences
├── .bun                       # Bun JavaScript runtime config
├── .ghostty/                  # Ghostty terminal (Nord theme, custom keybindings)
├── .ssh/config                # SSH configuration template
├── .ai/                       # AI CLI configuration
│   ├── common/                # Shared by Claude Code & Codex CLI
│   │   ├── instructions.md    # Global AI instructions
│   │   ├── commands/          # Slash commands (/craft)
│   │   └── hooks/             # PreToolUse safety hooks
│   ├── claude/                # Claude Code only
│   │   ├── settings.json      # Settings (plugins, permissions, statusline)
│   │   └── config/            # Custom statusline script
│   └── codex/                 # Codex CLI only
│       ├── config.toml        # Model and approval policy
│       └── hooks.json         # Hook configuration
├── .vscodium/                 # VSCodium settings, extensions, custom icon
├── .lazydocker/               # LazyDocker terminal UI configuration
├── .motd/                     # Message of the Day scripts (Linux/VPS)
└── .alfred/                   # Alfred workflows and preferences (macOS only)

Post-Install Configuration

1. SSH: Edit ~/dotfiles/.ssh/config with your key paths and hosts
2. SSH Agent: Edit .ssh-agent with your key paths
3. Git: git config --global user.name/user.email
4. Local overrides: Create ~/.zshrc.local for machine-specific settings

AI CLI Configuration

Shared configuration for Claude Code and Codex CLI, symlinked to ~/.claude/ and ~/.codex/.

• .ai/common/ contains only assets that are intended to work for both CLIs
• .ai/claude/ contains Claude-only settings
• .ai/codex/ contains Codex-only settings
• ~/.codex/instructions.md is loaded by Codex via model_instructions_file in .ai/codex/config.toml
• Codex hooks are enabled explicitly in .ai/codex/config.toml because hooks.json is ignored unless the codex_hooks feature is on
• Codex TUI status line and terminal title are versioned in .ai/codex/config.toml via the built-in [tui] settings; keeping the full status_line list there makes it persist across new Codex sessions
• Codex project trust is intentionally not hardcoded in the repo because projects.<path>.trust_level is machine-specific

Safety hooks — block-dangerous-commands.js blocks dangerous Bash commands via PreToolUse hooks at three levels:

• Critical: filesystem destruction, disk operations, fork bombs, git history rewriting
• High (default): git write ops, elevated privileges, secrets exposure, publishing/deployment, database ops
• Strict: cautionary patterns (git checkout ., docker prune)

Plugins (Claude Code only) — installed from enabled entries in .ai/claude/settings.json (currently superpowers, code-simplifier, frontend-design, sentry, swift-lsp, pyright-lsp).

VSCodium

VSCodium (open-source VS Code without Microsoft telemetry). Settings, extensions, and a custom icon are managed in .vscodium/:

• install.sh / update.sh handle symlinks, extensions, and icon automatically
• brew() wrapper in .functions re-applies the icon after upgrades
• alias code="codium" for transparent compatibility

Security

• Never commit actual SSH keys — only configuration templates
• Use .zshrc.local for private/sensitive configurations
• SSH keys should have 600 permissions
• .gitignore protects sensitive files

Troubleshooting

• Slow startup: time zsh -lic exit and zmodload zsh/zprof
• SSH issues: ssh -T git@github.com or ssh -vT for debug
• Homebrew: brew doctor and brew update

License

CC0 1.0 Universal

Inspired By

• @mathiasbynens
• @rodionovd
• @holman