REPL: Improved REPL

[adriaanm]

Here are some ideas for improving the repl:

• syntax highlighting
• class-based wrapping (PR)
• take advantage of Java 9 features
• improve embeddability of repl in worksheets for fast data platforms

Steal Incorporate the improvements already implemented in the Ammonite REPL:

• improved multi-line editing/history
• magic imports (ivy dependencies etc)

More ideas / requirements:

• reload class path when changing/recompiling project (faster test cycle)
• ctrl-c stops execution of program instead of repl itself
• test in IntelliJ shell window

[DavidPerezIngeniero]

+1 for incorporating Ammonite, this is a fantastic tool.

[kjsingh]

As long as we keep the performance smooth!

[yinshurman]

in the REPL, enter a Tab will display all the available names imported in the scope which makes a lot troubles in some case,for example,when pasting codes with tab as indent from editors like vim even in the :paste mode ,the screen if full of unexpected names.
by the way ,the auto completion by Tab direct print all the names in the screen makes it hard read on the console.Can't you just display it another way ? For example, like IPython' way.

[yinshurman]

In Python you can investigate any object foo (type, object in a global variable, built-in function, etc.) using foo to see what the thing evaluates to, type(foo) to show its type, dir(foo) to tell you the methods you can call on it, and help(foo) to get the built-in documentation. You can even do things like help("re") to find out the documentation on the package named re (which holds regular-expression objects and methods), even though there isn't an object associated with it.Can scala REPL does things like this ?

[som-snytt]

@yinshurman about tab, are you using a recent version with scala/bug#9336 ? That enables the kludge in jline; but maybe it could do more in paste mode.

[yinshurman]

I'm use scala of version 2.11.7

[adriaanm]

This should be fixed in 2.11.11. For some of the equivalent commands from python try :help

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[yinshurman]

It's fixed by add a tip "Display all 435 possibilities? (y or n)" every time you enter a tab.
Instead of direct printing all the available options ,I think it's better to display them another way,for example,when you type foo. and enter a tab, all the available options display in another little window right behind the foo.,and when you selected the option you needed,the window disappeared too. I think it is better comfortable

[som-snytt]

It's a nice consequence of English pronunciation that a windowing REPL or wrepl sounds the same as repl.

[adriaanm]

The plan is to first split the current repl into:

• a layer on top of the compiler (similar to the presentation compiler)
• a shell that implements the UI (and interfaces with jline3).

The api exposed by the compiler should also support other shells, such as ammonite / spark notebooks. Eventually, maybe we can support connecting to this repl compiler instance using the language server protocol (as in scala/scala3#2195)

I've just started hacking on this in my WIP branch: https://github.com/scala/scala/compare/2.13.x...adriaanm:repl-modularize?expand=1