pzsh

Performance-first shell framework with sub-10ms startup. Like oh-my-zsh, but 50-200x faster.

⚡ Demo

┌─────────────────────────────────────────────────────────────┐
│  noah@dev ~/src/pzsh (main)                                 │
│  ❯ pzsh bench                                               │
│                                                             │
│  Startup Benchmark (100 iterations)                         │
│  ────────────────────────────────                           │
│  min:       0.002ms   ████                                  │
│  max:       0.003ms   ████                                  │
│  mean:      0.003ms   ████                                  │
│  p99:       0.003ms   ████                                  │
│  ────────────────────────────────                           │
│  Budget: 10ms ✓ (p99 < 10ms)                                │
└─────────────────────────────────────────────────────────────┘

Core Invariant

No shell startup shall exceed 10ms. This is not a goal—it is a hard constraint enforced at compile time, test time, and runtime.

🚀 Performance

Benchmark Output

Startup Benchmark (100 iterations)
────────────────────────────────
min:       0.002ms
max:       0.003ms
mean:      0.003ms
p50:       0.003ms
p95:       0.003ms
p99:       0.003ms
────────────────────────────────
Budget: 10ms ✓ (p99 < 10ms)

Profile Breakdown

Startup Profile
├─ parse:   0.007ms
├─ env:     0.000ms
├─ alias:   0.000ms
├─ prompt:  0.005ms
└─ total:   0.013ms ✓

📦 Installation

cargo install pzsh

Add to your shell

# For zsh (~/.zshrc)
eval "$(pzsh init zsh)"

# For bash (~/.bashrc)
eval "$(pzsh init bash)"

🎨 Features

oh-my-zsh Compatibility

pzsh provides drop-in replacements for common oh-my-zsh features:

• Git plugin - g, ga, gc, gp, gst aliases
• Docker plugin - d, di, dps, dex aliases
• Colored prompts - Git branch with dirty status
• Themes - robbyrussell, agnoster, pure, minimal

Prompt Preview

┌──────────────────────────────────────────────────────────┐
│  robbyrussell theme                                      │
│  ➜ ~/src/pzsh (main*) git status                        │
├──────────────────────────────────────────────────────────┤
│  agnoster theme                                          │
│  noah │ dev │ ~/src/pzsh │ main* │ ❯                    │
├──────────────────────────────────────────────────────────┤
│  pure theme                                              │
│  ~/src/pzsh main*                                        │
│  ❯                                                       │
├──────────────────────────────────────────────────────────┤
│  minimal theme                                           │
│  > ls -la                                                │
└──────────────────────────────────────────────────────────┘

ML-Powered Completions

Optional integration with aprender-shell for intelligent command predictions:

# Load your trained model
pzsh completion --model ~/.local/share/pzsh/model.apr

# Predictions trained on your command history
$ git c<TAB>
  commit (0.85)   checkout (0.72)   clone (0.45)

🔧 Usage

# Initialize configuration
pzsh init --shell zsh

# Benchmark startup time
pzsh bench

# Lint for slow patterns
pzsh lint ~/.pzshrc

# Profile startup breakdown
pzsh profile

# Compile configuration
pzsh compile

# Check status
pzsh status

⚙️ Configuration

# ~/.pzshrc
[pzsh]
version = "0.2.0"
shell = "zsh"

[performance]
startup_budget_ms = 10
lazy_load = true

[prompt]
theme = "robbyrussell"
git_status = true
colors = true

[plugins]
enabled = ["git", "docker"]

[aliases]
ll = "ls -la"
gs = "git status"

[env]
EDITOR = "vim"
GOROOT = "/usr/local/opt/go/libexec"  # Pre-resolved, no $(brew ...)

🚫 Forbidden Patterns

pzsh enforces O(1) startup by rejecting slow patterns:

# FORBIDDEN: subprocess calls at startup
export GOROOT="$(brew --prefix golang)/libexec"  # 50-100ms per call

# ALLOWED: pre-resolved paths
export GOROOT="/usr/local/opt/go/libexec"  # 0ms

# FORBIDDEN: oh-my-zsh, NVM, conda init
source $ZSH/oh-my-zsh.sh  # 500-2000ms

# ALLOWED: pzsh lazy loading
eval "$(pzsh init zsh)"  # <1ms

🏗️ Architecture

┌─────────────────────────────────────────┐
│              pzsh init zsh              │
├─────────────────────────────────────────┤
│  Parser     │ O(1) LRU cache   │ 2ms   │
│  Executor   │ O(1) hash lookup │ 2ms   │
│  Prompt     │ Async git status │ 2ms   │
│  Config     │ Pre-compiled     │ 0ms   │
├─────────────────────────────────────────┤
│  Total Budget                  │ 10ms  │
└─────────────────────────────────────────┘

🧪 Testing

# Run all tests (335 tests, 97% coverage)
cargo test

# Run benchmarks
cargo bench

# Run with coverage
cargo llvm-cov --html

🔗 Built With

• bashrs v6.48 - Rust↔Shell transpiler
• aprender-shell v0.2 - ML completions
• trueno v0.10 - SIMD acceleration

📚 Toyota Way

Development follows the Toyota Production System:

• Andon - Stop the line on defects
• Kaizen - Continuous improvement
• Genchi Genbutsu - Go and see for yourself

📄 License

MIT