Allow JSON input via STDIN

[MikeFair]

Allow STDIN to supply the JSON input to bb8 cat someFileWithChangeTrustOp.js | bb8 change-trust --

Also allow the command to come from the JSON itself:

{
  "bb8_cmd":{
    "command":"change-trust",
    "data":{
      "source_account":"GACCT",
      "asset_code":"COMP", 
      "asset_issuer":"GISSUER"
  }
} | bb8 --

[tolitius]

this part

Allow STDIN to supply the JSON input to bb8

is supported:

$ cat tx.json
{
    "source_account": "GBDGNIE6H7RSFIXLID6XO3GHUPPCX5BBJ7JJBRXKB6DBS5B2VSEUWOG6",
    "name": "answer to the ultimate question",
    "value": "42"
}

$ cat tx.json | xargs -0 bb manage-data
AAAAAEZmoJ4/4yKi60D9d2zHo94r9CFP0pDG6g+GGXQ6rIlLAAAAZABt1SYAAAAGAAAAAAAAAAAAAAABAAAAAAAAAAoAAAAfYW5zd2VyIHRvIHRoZSB1bHRpbWF0ZSBxdWVzdGlvbgAAAAABAAAAAjQyAAAAAAAAAAAAAA==

not sure about the Windows syntax for it though, but it should work on Windows with power shell / bash / binutils

as to passing a command in JSON as well, need to think about it more, since this is most likely a different mode all together, since it is no longer "$ bb command args" where args could be in JSON, but rather "$ bb command-and-agrs" that come from JSON, which now also might need to support its own composition.

[MikeFair]

Agreed, perhaps

cat file.json | bb8 from-data -0

where from-data means the JSON data is something like the form: { "exec_flags": [], "command": "bb8-command", "command_flags": [...], "data": { ... } }

And instead of solely relying on xargs or the pipeline to make chaining work, what about modifying a transaction file one command at a time?

 set STELLAR_ACCOUNT=GMYACCOUNT

 REM empty-transaction sets source-account and sequence number in file init_account.xdr
 bb8 --txn_file init_account.xdr empty-transaction 

 bb8 gen-keys --newaccount  #creates newaccount.key and newacccount.pub
 bb8 --txn_file init_account.xdr create-account --keyfile newaccount.pub --amount 10

REM 'type' is the windows version of 'cat' though not nearly as cool
 type change-trust.json | bb8 --txn_file init_account.xdr change-trust -0 --op_source_account newaccount.pub
 type add-signer.json | bb8 --txn_file init_account.xdr add-singer -0 --op_source_account newaccount.pub
 type zero-master-key.json | bb8 --txn_file init_account.xdr set-options --op_source_account newaccount.pub

REM lastly sign the transaction to complete the init_account.xdr file, ready to submit
 bb8 --txn_file init_account.xdr sign my_signing_key.key newaccount.key