dependencies: defer importing a custom dependency until it is used

This lessens the amount of code imported at Meson startup by mapping
each dependency to a dictionary entry and using a programmable import to
dynamically return it.

Minus 16 files and 6399 lines of code imported at startup.

1 files changed, 1 insertions, 17 deletions

diff --git a/test cases/unit/113 empty project/expected_mods.json b/test cases/unit/113 empty project/expected_mods.json
index 9ad84d4..e4c699c 100644
--- a/test cases/unit/113 empty project/expected_mods.json
+++ b/test cases/unit/113 empty project/expected_mods.json
@@ -201,24 +201,8 @@
       "mesonbuild.coredata",
       "mesonbuild.dependencies",
       "mesonbuild.dependencies.base",
-      "mesonbuild.dependencies.boost",
-      "mesonbuild.dependencies.cmake",
-      "mesonbuild.dependencies.coarrays",
-      "mesonbuild.dependencies.configtool",
-      "mesonbuild.dependencies.cuda",
       "mesonbuild.dependencies.detect",
-      "mesonbuild.dependencies.dev",
-      "mesonbuild.dependencies.factory",
-      "mesonbuild.dependencies.framework",
-      "mesonbuild.dependencies.hdf5",
-      "mesonbuild.dependencies.misc",
-      "mesonbuild.dependencies.mpi",
       "mesonbuild.dependencies.pkgconfig",
-      "mesonbuild.dependencies.platform",
-      "mesonbuild.dependencies.python",
-      "mesonbuild.dependencies.qt",
-      "mesonbuild.dependencies.scalapack",
-      "mesonbuild.dependencies.ui",
       "mesonbuild.depfile",
       "mesonbuild.envconfig",
       "mesonbuild.environment",
@@ -271,6 +255,6 @@
       "mesonbuild.wrap",
       "mesonbuild.wrap.wrap"
     ],
-    "count": 97
+    "count": 81
   }
 }