fix: [PRODUCT-604] build --start param of equivalent buy command correctly

[sigmachirality]

@coffinsfcompute pointed out that we don't include --start <contractToExtend.End> in the equivalent buy colocate command, making it not actually equivalent.

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
src/lib/extend/index.tsx	19% smaller

[greptile-apps]

Greptile Overview

Greptile Summary

Fixed the equivalent sf buy command shown by the deprecated sf extend command to include the --start parameter set to the contract's end time, making it truly equivalent to extending a contract.

Key changes:

• Fetches contract details via API to retrieve the contract end time
• Extracts endsAt from contract shape using getContractRange utility
• Builds equivalent buy command with -s <contract_end_time> parameter
• Falls back to placeholder <contract_end_time> if API fetch fails
• Updates help text to reflect the corrected command format

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The change correctly addresses the reported issue by fetching contract details and extracting the end time to build an accurate equivalent command. The implementation follows existing patterns in the codebase (using apiClient, getContractRange), includes proper error handling with fallback to a placeholder value, and maintains backward compatibility. The change is isolated to a deprecated command with clear migration messaging.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
src/lib/extend/index.tsx	5/5	Added API call to fetch contract details and correctly build the equivalent buy command with --start parameter set to the contract's end time

Sequence Diagram

sequenceDiagram
    participant User
    participant extendAction
    participant apiClient
    participant API as /v0/contracts/{id}
    participant getContractRange
    participant Console

    User->>extendAction: Run sf extend command
    extendAction->>apiClient: Initialize API client
    extendAction->>API: GET /v0/contracts/{id}
    alt Fetch successful
        API-->>extendAction: Return contract data
        extendAction->>getContractRange: Extract contract.shape
        getContractRange-->>extendAction: Return {startsAt, endsAt}
        extendAction->>extendAction: Build command with endsAt.toISOString()
        extendAction->>Console: Display equivalent buy command with -s flag
        extendAction->>User: Exit with code 0
    else Fetch failed
        API-->>extendAction: Return error
        extendAction->>Console: Display error and equivalent command with placeholder
        extendAction->>User: Exit with code 1
    end

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