reload for interactive work + Autoreload successor



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ClobberingReload.jl helps with interactive development.

  • creload(::Module) is a drop-in replacement for reload(modulename), that does not require rebuilding the state after reload. The new code takes effect immediately, and works on existing objects.
  • Modules loaded with @ausing and @aimport are automatically reloaded when they are modified. This works as a successor to @malmaud's Autoreload.jl package.
  • scrub_stderr, scrub_redefinition_warnings and no_warnings run code with some warnings silenced.

See below for usage information, and the docstrings for details (eg. ?creload)

ClobberingReload borrows some code and interface from Autoreload.jl by Jon Malmaud, and from Revise.jl by Tim Holy (which offers similar functionality under a different interface).

Using creload

Interactively (whether in the REPL, Atom, or IJulia):

using ClobberingReload
using Houses               # `using` modules is fine (unlike with `reload`)

h = House(nwindows=10)
println("Price of house:$(price(h))")
> Price of house: 100

.... modify Houses.jl, change the `price` function ....


println("Price of house:$(price(h))")    # no need to redefine h
> Price of house: 130

NOTE: Parametric types cannot be defined inside a creloaded module on Julia 0.5. This is fixed on Julia 0.6. Parametric type aliases are still a problem, but there is an experimental alternative that should solve this: creload_strip(module). Please report any issues.


In IJulia (Jupyter notebooks), creload will be called automatically for modules that were imported using @ausing or @aimport, whenever the module's source code has been changed.

using ClobberingReload

using Images    # regular using
@ausing Foo     # autoreloaded using
@aimport Bar    # autoreloaded import
@ausing Car <: (Foo, Bar)  # autoreloaded with dependency: whenever Car, Foo, or Bar
                           # are modified, Car will be reloaded

> 5

# ... modify Bar.jl, or one of its `include`d files

>   INFO: Reloading `Bar`
> 42

The Julia REPL does not have execution hooks yet, but you can still trigger the autoreload feature for @aimported modules by calling areload() manually. Or you can use Revise.jl, which works around this issue by scheduling a background thread.

Silencing warnings

scrub_stderr, scrub_redefinition_warnings and no_warnings silence some of Julia's warnings. Typical usage:

scrub_redefinition_warnings() do
  • sinclude("foo.jl") uses the above code to run include("foo.jl") without the usual redefinition warnings.
  • scrub_stderr can scrub arbitrary warnings using regexes. See its docstring for details.

How creload works

Julia's reload(mod) loads mod from scratch, creating a new module object, then replaces the old module object with the new one. As a consequence:

import A

st = A.SomeType(10)
st2 = A.SomeType(10)
typeof(st) == typeof(st2)   # false

st and st2 are actually of a different type, and cannot be equal. Functions defined on the first ::A.SomeType will not work on the second, and vice versa. This is inconvenient when working interactively.

ClobberingReload.creload solves this problem by never creating a second module. It just evaluates the modified code inside the existing module object, replacing the previous definitions.

using ClobberingReload
import A

st = A.SomeType(10)
st2 = A.SomeType(10)
typeof(st) == typeof(st2)   # true

Furthermore, reload cannot reload modules imported via using, but creload can.

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