Add exec for Files

src/parallelism.jl

@@ -57,7 +57,8 @@ end
 """
     exec(x)
 
-If `x` is a FileTree, computes any uncomputed `Thunk`s stored as values in it. Returns a new tree with the computed values.
+If `x` is a `FileTree`, computes any uncomputed `Thunk`s stored as values in it. Returns a new tree with the computed values.
+If `x` is a `File`, computes the value if it is a `Thunk`. Returns a new `File` with the computed value.
 If `x` is a `Thunk` (such as the result of a `reducevalues`), then exec will compute the result.
 If `x` is anything else, `exec` just returns the same value.
 """
@@ -71,5 +72,6 @@ Same as `exec(x)` with a ctx being passed to `Dagger` when computing any `Thunks
 exec(ctx, x) = x
 
 exec(ctx, d::FileTree) = mapexec(ctx, d, map=(f,t) -> mapvalues(f, t; lazy=false))
+exec(ctx, f::File) = setvalue(f, exec(ctx, f[]))
 
 exec(ctx, d::Union{Thunk, Chunk}) = collect(ctx, compute(ctx, d))

test/basics.jl

@@ -200,6 +200,8 @@ end
 
     @test get(t1["a/b/a"]) isa Thunk
     @test get(exec(t1)["a/b/a"]) == string(p"."/"A"/"B"/"A")
+    # Exec a single File
+    @test get(exec(t1["a/b/a"])) == string(p"."/"A"/"B"/"A")
 
     @test exec(reducevalues(*, mapvalues(lowercase, t1))) == lowercase(exec(reducevalues(*, t1)))