feat: improved export command, namespace aliases
#6393
+489
−80
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This PR gives the `export` command the ability to create aliases to namespaces, in addition to its current ability to create aliases to individual declarations. It adds a number of `open`-like variations to the syntax. * `export NS1 ... NSn` makes the current namespace be an alias for the provided namespaces. * `export NS (def1 ... defn)` has the same meaning as before, but if any `NS.defi` is a namespace then the alias also serves as a namespace alias. For example, if one were to do ```lean namespace MyNS export _root_ (Nat) end MyNS ``` then not only is `MyNS.Nat` available as an alias for `Nat`, but additionally `MyNS.Nat.succ` is now an alias for `Nat.succ`. * `export NS hiding def1 ... defn` is like `export NS`, but the given names in `NS` do not get aliases. * `export NS renaming def1 -> def1', ..., defn -> defn'` creates aliases for the given names `def1` through `defn`, but the aliases respectively use the names `def1'` through `defn'`.
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This PR gives the
exportcommand the ability to create aliases to namespaces, in addition to its current ability to create aliases to individual declarations. It adds a number ofopen-like variations to the syntax.export NS1 ... NSnmakes the current namespace be an alias for the provided namespaces.export NS (def1 ... defn)has the same meaning as before, but if anyNS.defiis a namespace then the alias also serves as a namespace alias. For example, if one were to doMyNS.Nameavailable as an alias forName, but now additionallyMyNS.Name.stris an alias forLean.Name.str.export NS hiding def1 ... defnis likeexport NS, but the given namesdef1throughdefninNSdo not get aliases.export NS renaming def1 -> def1', ..., defn -> defn'creates aliases for the given namesdef1throughdefn, but the aliases respectively use the namesdef1'throughdefn'.Closes #6394 (RFC)