On Saturday, 24 November 2018 at 08:44:19 UTC, Domain wrote:
I have a package named command, and many modules inside it,
such as command.build, command.pack, command.help...
I want to get all these modules at compile time so that I know
what command is available.
If you just want static if expressions of whether *known* modules
are available or not, then test if __traits(identifier,
package.module) compiles.
---
// Two-step workaround for
https://issues.dlang.org/show_bug.cgi?id=19409
enum hasBuild = __traits(compiles, __traits(identifier,
command.build));
enum hasPack = __traits(compiles, __traits(identifier,
command.pack));
enum hasHelp = __traits(compiles, __traits(identifier,
command.help));
static if (hasBuild) { /* ... */ }
static if (hasPack) { /* ... */ }
static if (hasHelp) { /* ... */ }
---
__traits(compiles, { import package.module; }) mostly works, but
I ran into problems when the module was available and merely did
not compile.
If you want to iterate the package for modules imported in it,
I'm not sure. __traits(allMembers, package) will list names of
imported packages but not which modules.
