Re: psql :: support for \ev viewname and \sv viewname

Hackers!

I'm proposing to add two new subcommands in psql:

1. \ev viewname - edit view definition with external editor (like \ef for function)

2. \sv viewname - show view definition (like \sf for function, for consistency)

What's inside:

1. review-ready implementation of \ev and \sv psql subcommands for editing and viewing view's definition.

2. psql's doc update with new subcommands description.

3. a bit of extracting common source code parts into separate functions.

4. psql internal help update.

5. tab completion update.

There is one narrow place in this patch: current implementation doesn't support "create" statement formatting for recursive views.

Any comments? Suggestions?

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