Support command pipes, i.e. reading from stdin and writing to stdout

[christerswahn]

This seems like a great tool! Will really save time and headache in our project.

However it is tricky to use by other command development libraries and their scripted build pipelines since it does not support standard command piping, i.e. reading the configuration from stdin.

completely preview can output to stdout but it is a bit strange to use a command called "preview" for production use.

What would be great would be to write:

$ my-command-yaml-generator | completely generate | completely install my-command

E.g. using just completely's example:

$ completely init | completely generate | completely install mygit

Also, it is not possible to specify completely generate OUTPUT_PATH without the CONFIG_PATH option, which would be needed if the input is from stdin:

$ my-command-yaml-generator | completely generate myfile.bash

[DannyBen]

So you are saying two things

1. Allow generating to stdout, with a command name that is not preview, and preferably generate itself.
2. Allow reading config from stdin

Right?

I would like to leave the install command out of this (at least for the time being) - it is finicky due to the many possible directories and OS differences.

[DannyBen]

I am experimenting with an implementation in #84 in case you want to take a look.

[christerswahn]

Looks good, hands-up for the quick response time!

We're not currently using completely install, but if we were in order to make use of its OS and pathing knowledge, it would be good in general for it to support reading from stdin. It would unlock using it for the use cases where the content doesn't touch the file system until the final installed file is written.

(We will just use my-command-yaml-generator | completely generate - destination-file with the new functionality.)

[DannyBen]

I guess I can add the stdin support for the installer as well.
But running completely twice is probably less ideal.

Maybe we also need config_generator | completely generate - --install support?

[christerswahn]

That makes sense!

[DannyBen]

Added stdin support for the install command.
As for the generate --install flag, I will leave this to later.

[DannyBen]

Released in v0.7.3.