Add back --readable-names flag

[disnet]

By default hygiene gives all bindings a new name with _<number> appended to it. In most cases you can just drop the unique suffix; it is only needed in cases where multiple bindings with the same name mix. In pre 1.0 the --readable-names flag did this.

Adding it back now is probably much easier with the Shift scope analyser.

[jayphelps]

This discussion has probably happened elsewhere but any reason not to make the --readable-names behavior the default instead and provide a flag to uniquify everything if they want that?

[disnet]

Ah good call. That's probably a better default.

[bearnshaw]

+1

[gkovacs]

Doesn't seem to have been addressed. A "fix" which probably breaks things but works for me is in my branch https://github.com/gkovacs/sweet.js at gkovacs@94f6374

[disnet]

@gkovacs indeed that will avoid the renaming but hygiene is obviously broken now.

[gkovacs]

yes I mean obviously the system should optimally check to see if a rename is required and only rename if necessary. none of my macros declare new variables so it seems to work for my purposes.