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#!/usr/bin/env python3
"""
Example demonstrating SelectUI with Pydantic models.
This shows how to use SelectItem for type safety and validation.
"""
import os
import sys
sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', 'src'))
from selectui import SelectItem, SelectUI
def example_basic_pydantic():
"""Basic usage with Pydantic models."""
print("Example 1: Basic Pydantic models\n", file=sys.stderr)
items = [
SelectItem(
title="Python",
subtitle="High-level programming language",
info="1991",
data={"website": "python.org", "typing": "dynamic"}
),
SelectItem(
title="Rust",
subtitle="Systems programming language",
info="2010",
data={"website": "rust-lang.org", "typing": "static"}
),
SelectItem(
title="Go",
subtitle="Concurrent programming language",
info="2009",
data={"website": "go.dev", "typing": "static"}
),
]
app = SelectUI(items=items, oneshot=True)
app.run()
return app.selected_item
def example_validation():
"""Demonstrate validation with Pydantic."""
print("Example 2: Pydantic validation\n", file=sys.stderr)
items = []
# Valid item
try:
item = SelectItem(title="Valid Item", subtitle="This works")
items.append(item)
print("✓ Created valid item", file=sys.stderr)
except Exception as e:
print(f"✗ Error: {e}", file=sys.stderr)
# Try to create item with empty title (will fail validation)
try:
item = SelectItem(title="", subtitle="Empty title")
items.append(item)
print("✓ Created item with empty title", file=sys.stderr)
except Exception as e:
print(f"✓ Validation caught empty title: {e}", file=sys.stderr)
# Try to create item with whitespace-only title (will fail)
try:
item = SelectItem(title=" ", subtitle="Whitespace title")
items.append(item)
print("✓ Created item with whitespace title", file=sys.stderr)
except Exception as e:
print(f"✓ Validation caught whitespace title: {e}", file=sys.stderr)
# Add more valid items
items.extend([
SelectItem(title="Item 2", subtitle="Second item"),
SelectItem(title="Item 3", subtitle="Third item"),
])
if items:
app = SelectUI(items=items, oneshot=True)
app.run()
return app.selected_item
return None
def example_from_dict():
"""Convert dictionaries to SelectItem with custom key mappings."""
print("Example 3: Converting from dicts with custom keys\n", file=sys.stderr)
raw_data = [
{"name": "Alice", "role": "Engineer", "team": "Backend", "level": "Senior"},
{"name": "Bob", "role": "Designer", "team": "Product", "level": "Mid"},
{"name": "Charlie", "role": "Manager", "team": "Engineering", "level": "Staff"},
]
# Convert to SelectItem with custom key mappings
items = [
SelectItem.from_dict(
data,
title_key="name",
subtitle_key="role",
info_key="team"
)
for data in raw_data
]
# Show what we got
for item in items:
print(f" {item.title} - {item.subtitle} [{item.info}]", file=sys.stderr)
print(f" Full data: {item.data}", file=sys.stderr)
print("", file=sys.stderr)
app = SelectUI(items=items, oneshot=True)
app.run()
return app.selected_item
def example_mixed_usage():
"""Mix Pydantic models and dicts (automatically converted)."""
print("Example 4: Mixed Pydantic and dict usage\n", file=sys.stderr)
# Create some items as Pydantic models
pydantic_items = [
SelectItem(title="Pydantic Item 1", subtitle="Type-safe item"),
SelectItem(title="Pydantic Item 2", subtitle="Validated item"),
]
# These will be automatically handled by SelectUI
# Note: When using dicts, you need to pass them directly to SelectUI
# SelectUI will handle both types
app = SelectUI(items=pydantic_items, oneshot=True)
app.run()
return app.selected_item
def example_custom_data():
"""Use the data field for additional information."""
print("Example 5: Custom data field\n", file=sys.stderr)
items = [
SelectItem(
title="Config A",
subtitle="Development configuration",
data={
"path": "/etc/app/dev.conf",
"environment": "dev",
"port": 8000,
"debug": True
}
),
SelectItem(
title="Config B",
subtitle="Production configuration",
data={
"path": "/etc/app/prod.conf",
"environment": "prod",
"port": 80,
"debug": False
}
),
]
app = SelectUI(items=items, oneshot=True)
app.run()
if app.selected_item:
print("\nSelected configuration:", file=sys.stderr)
print(f" Path: {app.selected_item.get('path')}", file=sys.stderr)
print(f" Environment: {app.selected_item.get('environment')}", file=sys.stderr)
print(f" Port: {app.selected_item.get('port')}", file=sys.stderr)
print(f" Debug: {app.selected_item.get('debug')}", file=sys.stderr)
return app.selected_item
if __name__ == "__main__":
examples = {
"1": ("Basic Pydantic models", example_basic_pydantic),
"2": ("Pydantic validation", example_validation),
"3": ("Converting from dicts", example_from_dict),
"4": ("Mixed usage", example_mixed_usage),
"5": ("Custom data field", example_custom_data),
}
if len(sys.argv) < 2:
print("Usage: python pydantic_example.py <example_number>", file=sys.stderr)
print("\nAvailable examples:", file=sys.stderr)
for num, (desc, _) in examples.items():
print(f" {num} - {desc}", file=sys.stderr)
sys.exit(1)
example_num = sys.argv[1]
if example_num not in examples:
print(f"Error: Example {example_num} not found", file=sys.stderr)
sys.exit(1)
desc, func = examples[example_num]
result = func()
if result:
print(f"\n{'='*60}", file=sys.stderr)
print("RESULT:", file=sys.stderr)
import json
print(json.dumps(result, indent=2), file=sys.stderr)
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