Add API to retrieve data source applications metadata

[Copilot]

Implements functionality to programmatically retrieve metadata from all data source applications (unified hosts and extensions) used by the aggregator.

Changes

• New API function: get_all_applications() retrieves metadata from all update.json files in data/ and extensions/ directories, returning a list of dicts with source metadata (name, type, URL, license, etc.)

• CLI interface: Added --list-applications (-l) flag to display all sources with formatted output

• Implementation: Uses helper function to eliminate duplication between unified/extension source reading. Error messages distinguish source types using print_failure() for consistency.

• Tests: Added TestGetAllApplications with 2 test cases covering normal and empty results

Usage

# Programmatic access
from updateHostsFile import get_all_applications

apps = get_all_applications()
for app in apps:
    print(f"{app['name']} ({app['type']}): {app['url']}")

# CLI access
python3 updateHostsFile.py --list-applications

Returns metadata including: name, type (unified/extension), description, home URL, data URL, license, update frequency, paused status, and file path.

Original prompt

Ottenere applicazioni API

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