Currently, many settings in Guppy need to be passed via command-line flags, which can be repetitive and cumbersome for users who frequently use the same settings. There's no way to persist user preferences or default configurations.

Problem

Users need to:

• Repeatedly type the same flags for common operations
• Remember various flag combinations for different scenarios
• Manually set up the same configuration across different environments
• Pass space DID and proof paths explicitly for each command

Proposed Solution

Add support for a configuration file (e.g., .guppy.yaml or .guppy.toml) that allows users to:

1. Set default values for common flags
2. Configure environment-specific settings
3. Store frequently used space DIDs
4. Define custom profiles for different use cases

Implementation Details

1. Configuration File Location

Primary locations (in order of precedence):

• Current directory: ./.guppy.yaml
• User's home directory: ~/.guppy/config.yaml
• System-wide: /etc/guppy/config.yaml

2. Configuration Structure

# Example .guppy.yaml
default:
  space: "did:key:default_space_did"
  proof_path: "~/.guppy/proofs"
  json_output: false
  verbose: false

spaces:
  production:
    did: "did:key:prod_space_did"
    proof_path: "/path/to/prod/proofs"
  development:
    did: "did:key:dev_space_did"
    proof_path: "/path/to/dev/proofs"

upload:
  default_shard_size: 1073741824  # 1GB
  wrap_single_files: true
  include_hidden: false

profiles:
  prod:
    space: "production"
    verbose: true
    json_output: true
  dev:
    space: "development"
    verbose: true
    wrap_single_files: false

3. Command Line Integration

# Use specific profile
guppy --profile prod up file.txt

# Override config settings
guppy --space different:did up --no-wrap file.txt

4. Configuration Management Commands

Add new commands for managing configuration:

# Initialize config file
guppy config init

# Set a configuration value
guppy config set upload.default_shard_size 2GB

# Get a configuration value
guppy config get upload.default_shard_size

# List all settings
guppy config list

# Add a new profile
guppy config profile create dev