Add support for ImportC by turning them to .di on the fly

[bangbangsheshotmedown]

Works like a charm:

There is also -X, wich generates a json, i wonder if that can be used for templates/mixins, i'll experiment for an other PR

[github-actions]

Thanks for your Pull Request and making D better!

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[bangbangsheshotmedown]

The joy of not having to generate bindings to get completion anymore

[bangbangsheshotmedown]

I forgot to say, this needs a patch for DMD, because -Hf never prints to output, i'll send a PR

[bangbangsheshotmedown]

I forgot, they banned me from the repo, @WebFreak001 can you submit the patch for me please?

PR: Generate .di to stdout if name is "-"

This matches the behavior of -X=-
This is needed for #798

$ git diff compiler/src/dmd/main.d                                                                                                                                                   
diff --git a/compiler/src/dmd/main.d b/compiler/src/dmd/main.d
index 9a04c16b9f..4458e623b5 100644
--- a/compiler/src/dmd/main.d
+++ b/compiler/src/dmd/main.d
@@ -582,7 +582,12 @@ private int tryMain(const(char)[][] argv, out Param params)
 
             buf.reset();         // reuse the buffer
             genhdrfile(m, params.dihdr.fullOutput, buf);
-            if (!writeFile(m.loc, m.hdrfile.toString(), buf[]))
+
+            if (params.dihdr.name == "-") {
+                size_t n = fwrite(buf[].ptr, 1, buf.length, stdout);
+                assert(n == buf.length);
+            }
+            else if (!writeFile(m.loc, m.hdrfile.toString(), buf[]))
                 fatal();
         }
     }

[bangbangsheshotmedown]

Now also completes import paths:

[bangbangsheshotmedown]

A PR for it got merged: dlang/dmd#22662