`merge` command would be nice to have

[yegor256]

Motivated by #148

Imagine, we have two .phi files:

{[ a -> 42 ]}

and

{[ b -> 7 ]}

Would be great to have an ability to do this:

$ phino merge a.phi b.phi
{[ a -> 42,  b -> 7 ]}

[yegor256]

@maxonfjvipon FYI

[maxonfjvipon]

@yegor256 is this supposed to work only if we have top level formations in accepted expressions?

[yegor256]

@maxonfjvipon yes. Otherwise, we should just fail.

[maxonfjvipon]

@yegor256 what about duplicate attributes? What do you think if we use join function under the hood for this task? It generates random attributes if they already exist. Also this behaviour may be optional and controlled by CLI option

[yegor256]

@maxonfjvipon sounds good, let's use join

[maxonfjvipon]

@yegor256 merging via join won't work because of this:

It generates random attributes if they already exist.

So if we have such two programs:

# first
{[[
  org -> [[ eolang -> [[ number -> [[ .. ]] ]] ]]
]]}
# second
{[[
  org -> [[ eolang -> [[ bytes -> [[ .. ]] ]] ]]
]]}

They WON'T be joined into this:

{[[
  org -> [[ eolang -> [[ number -> [[ .. ]], bytes -> [[ .. ]] ]] ]]
]]}

With join we'll get:

{[[
  org -> [[ eolang -> [[ number -> [[ .. ]] ]] ]],
  a🌵1234 -> [[ eolang -> [[ bytes -> [[ .. ]] ]] ]]
]]}

I suppose this is not what we want to get?

[yegor256]

@maxonfjvipon definitely, this is not what we want