Julia: Automatically remove `.jl` termination in `Pkg.add`

[dpsanders]

julia> Pkg.add("Lint.jl")
ERROR: unknown package Lint.jl

[StefanKarpinski]

Very good idea. Should be simple to implement.

[dpsanders]

Also in e.g.
using Lint.jl
import Lint.jl

[timholy]

PkgDev is another: how many times have I said PkgDev.generate("MyNewPackage.jl") and created a MyNewPackage.jl.jl?

[cossio]

What if a package is named "package.jl"? That is, the source file is "package.jl.jl". Such a naming pattern is not hard to imagine. Maybe somebody has a package for different languages, and decided to append .py, .jl, etc to the package name to identify the language.

[dpsanders]

Would anybody really have a source file package.jl.jl? Have you ever actually seen that? We should definitely be anti-encouraging that.

[cossio]

I have never seen it. But it should be kept in mind if one decides that Pkg.add("Lint.jl") automatically removes the .jl. Maybe mention it in the documentation.

[yuyichao]

Also in e.g.
using Lint.jl
import Lint.jl

Note that these are already legal expressions.

[dpsanders]

Ah, I was checking on 0.5 where they weren't, thanks.

[yuyichao]

It always is

               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: http://docs.julialang.org
   _ _   _| |_  __ _   |  Type "?help" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.5.0 (2016-09-19 18:14 UTC)
 _/ |\__'_|_|_|\__'_|  |
|__/                   |  x86_64-pc-linux-gnu

julia> module A
       jl = 1
       end
A

julia> using A.jl

[dpsanders]

Ah, oops, thanks.

[StefanKarpinski]

As @yuyichao pointed out, using Foo.jl already has a meaning. Package names can't contain dots so there's no actual danger of a package named Foo.jl with source file Foo.jl.jl.