json format output for commands

[soldair]

in #1 i mentiond a --format json or --json flag

i said:
"I do think the tool should support something like a --json or --format json flag so commands like this can be consumed by other programs. This would allow refactor for readability of human output without introducing a breaking change. ill open an issue for discussion."

• when we refactor for readability in the "human" version of the output. Programs parsing the output of nodemcu-tool will break.
• If we provide an alternative computer friendly output format we don't have to worry about it and this tool becomes quite a bit more useful.

[AndiDittrich]

it's a great idea! for all operations or only for a special set ?

if you're using Node.js you can directly access the Connector API for low-level operations

[AndiDittrich]

Dear soldair,

i've added a JSON output option to the devices and fsinfo command. Additionally a global --silent option is available to reject status/logging messages.

i'm currently working on some return_codes to indicate program errors to an external process

[soldair]

cool. ill check it out. thanks!