feat: Add support to give error flag name in error if required flag is missing

[vikas-sharma24]

Description

Added support to give error flag name in error if required flag is missing

Related Issue

Fixes #69

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Code refactor

Testing

Added all test result here: #68 (comment)

Checklist

• My code follows the project's coding standards
• I have performed a self-review of my code
• I have commented my code where necessary
• I have updated the documentation
• I have added tests that prove my fix/feature works
• All new and existing tests pass

[vikas-sharma24]

Updated command response if required flag is missing

base64:

vikassharma@Vikass-MacBook-Pro contract-cli % ./contract-cli base64
Usage:
  contract-cli base64 [flags]

Mandatory Flags:
  --in      Input data to encode (text or JSON)

Optional Flags:
  --format  Input data format (text or json)
  --help    help for base64
  --out     Path to save Base64 encoded output
2025/12/24 12:41:57 Error: required flag '--in' is missing.

base64-tgz:

vikassharma@Vikass-MacBook-Pro contract-cli % ./contract-cli base64-tgz 
Usage:
  contract-cli base64-tgz [flags]

Mandatory Flags:
  --in      Path to folder containing docker-compose.yaml or pods.yaml

Optional Flags:
  --cert    Path to encryption certificate file
  --help    help for base64-tgz
  --os      Target Hyper Protect platform (hpvs, hpcr-rhvs, or hpcc-peerpod)
  --out     Path to save Base64 tar.gz output
  --output  Output format (plain or encrypted)
2025/12/24 12:42:11 Error: required flag '--in' is missing.

decrypt-attestation:

vikassharma@Vikass-MacBook-Pro contract-cli % ./contract-cli decrypt-attestation 
Usage:
  contract-cli decrypt-attestation [flags]

Mandatory Flags:
  --in    Path to encrypted attestation file (se-checksums.txt.enc)
  --priv  Path to private key file for signing

Optional Flags:
  --help  help for decrypt-attestation
  --out   Path to save decrypted attestation records
2025/12/24 12:42:36 Error: required flag --in, --priv are missing.

download-certificate:

vikassharma@Vikass-MacBook-Pro contract-cli % ./contract-cli download-certificate 
Usage:
  contract-cli download-certificate [flags]

Mandatory Flags:
  --version  Specific certificate versions to download (comma-separated, e.g., 1.0.21,1.0.22)

Optional Flags:
  --format   Output format for data (json, yaml, or text)
  --help     help for download-certificate
  --out      Path to save downloaded encryption certificates
2025/12/24 12:42:57 required flag --version is missing

encrypt:

vikassharma@Vikass-MacBook-Pro contract-cli % ./contract-cli encrypt
Usage:
  contract-cli encrypt [flags]

Mandatory Flags:
  --in               Path to unencrypted contract YAML file

Optional Flags:
  --cacert           Path to CA certificate file (required with --contract-expiry)
  --cakey            Path to CA private key file (required with --contract-expiry)
  --cert             Path to encryption certificate file
  --contract-expiry  Enable contract expiry feature (requires CA cert and key)
  --csr              Path to Certificate Signing Request (CSR) file
  --csrParam         Path to CSR parameters JSON file
  --expiry           Contract validity period in days (required with --contract-expiry)
  --help             help for encrypt
  --os               Target Hyper Protect platform (hpvs, hpcr-rhvs, or hpcc-peerpod)
  --out              Path to save signed and encrypted contract
  --priv             Path to private key file for signing
2025/12/24 12:43:15 Error: required flag '--in' is missing.

encrypt-string:

vikassharma@Vikass-MacBook-Pro contract-cli % ./contract-cli encrypt-string
Usage:
  contract-cli encrypt-string [flags]

Mandatory Flags:
  --in      String data to encrypt (text or JSON)

Optional Flags:
  --cert    Path to encryption certificate file
  --format  Input data format (text or json)
  --help    help for encrypt-string
  --os      Target Hyper Protect platform (hpvs, hpcr-rhvs, or hpcc-peerpod)
  --out     Path to save encrypted output
2025/12/24 12:43:34 Error: required flag '--in' is missing.

get-certificate:

vikassharma@Vikass-MacBook-Pro contract-cli % ./contract-cli get-certificate
Usage:
  contract-cli get-certificate [flags]

Mandatory Flags:
  --in       Path to download-certificate JSON output
  --version  Certificate version to extract (e.g., 1.0.23)

Optional Flags:
  --help     help for get-certificate
  --out      Path to save extracted encryption certificate
2025/12/24 12:43:50 Error: required flag --in, --version are missing.

image:

vikassharma@Vikass-MacBook-Pro contract-cli % ./contract-cli image
Usage:
  contract-cli image [flags]

Mandatory Flags:
  --in       Path to IBM Cloud images JSON (from API, CLI, or Terraform)

Optional Flags:
  --format   Output format for data (json, yaml, or text)
  --help     help for image
  --out      Path to save HPCR image details
  --version  Specific HPCR version to retrieve (returns latest if not specified)
2025/12/24 12:44:07 Error: required flag '--in' is missing.

validate-contract:

vikassharma@Vikass-MacBook-Pro contract-cli % ./contract-cli validate-contract
Usage:
  contract-cli validate-contract [flags]

Mandatory Flags:
  --in    Path to unencrypted Hyper Protect contract YAML file

Optional Flags:
  --help  help for validate-contract
  --os    Target Hyper Protect platform (hpvs, hpcr-rhvs, or hpcc-peerpod)
2025/12/24 12:44:25 Error: required flag '--in' is missing.

validate-encryption-certificate:

vikassharma@Vikass-MacBook-Pro contract-cli % ./contract-cli validate-encryption-certificate
Usage:
  contract-cli validate-encryption-certificate [flags]

Mandatory Flags:
  --in    Versions of Encryption Certificates to validate, Seperated by coma(,)

Optional Flags:
  --help  help for validate-encryption-certificate
2025/12/24 12:44:43 Error: required flag '--in' is missing.

validate-network:

vikassharma@Vikass-MacBook-Pro contract-cli % ./contract-cli validate-network
Usage:
  contract-cli validate-network [flags]

Mandatory Flags:
  --in    Path to network-config YAML file

Optional Flags:
  --help  help for validate-network
2025/12/24 12:45:01 Error: required flag '--in' is missing.

[Sashwat-K]

Lets make the error come first and then the help after few lines.