Add @reexport macro

Syntax is: @reexport using MyModule1, MyModule2 Fixes #1986
JuliaLang · Jan 30, 2014 · a8e43d8 · a8e43d8
1 parent f384033
commit a8e43d8
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Showing 2 changed files with 14 additions and 1 deletion.
diff --git a/base/exports.jl b/base/exports.jl
@@ -1296,4 +1296,5 @@ export
     @sprintf,
     @deprecate,
     @boundscheck,
-    @inbounds
+    @inbounds,
+    @reexport
diff --git a/base/loading.jl b/base/loading.jl
@@ -167,3 +167,15 @@ function evalfile(path::String, args::Vector{UTF8String}=UTF8String[])
                      :(include($path))))
 end
 evalfile(path::String, args::Vector) = evalfile(path, UTF8String[args...])
+
+macro reexport(ex)
+    (isa(ex, Expr) && ex.head == :toplevel && begin
+        valid = true
+        for usingex in ex.args
+            valid &= isa(usingex, Expr) && usingex.head == :using
+        end
+        valid
+    end) || error("@reexport: syntax error")
+    esc(Expr(:toplevel, ex.args...,
+             [:(eval(Expr(:export, names($(usingex.args[end]))...))) for usingex in ex.args]...))
+end