make kanren a soft-dependency

inducer · Oct 8, 2021 · b7a1305 · b7a1305
1 parent 4009abf
commit b7a1305
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Showing 2 changed files with 12 additions and 4 deletions.
diff --git a/loopy/__init__.py b/loopy/__init__.py
@@ -156,7 +156,6 @@
 
 from loopy.tools import Optional, t_unit_to_python
 
-import loopy.relations as relations
 from loopy.transform.loop_fusion import (fuse_loops_kennedy_unweighted,
                                          rename_inames_in_batch)
 
@@ -307,9 +306,6 @@
 
         "Optional",
 
-        # sub-modules
-        "relations",
-
         # {{{ from this file
 
         "register_preamble_generators",
@@ -323,6 +319,15 @@
         # }}}
         ]
 
+
+try:
+    import loopy.relations as relations
+except ImportError:
+    # catching ImportErrors to avoid making minikanren a hard-dep
+    pass
+else:
+    __all__ += ["relations"]
+
 # }}}
 
 

diff --git a/requirements.txt b/requirements.txt
@@ -10,3 +10,6 @@ git+https://github.com/inducer/f2py#egg=f2py
 
 # Optional, needed for using the C preprocessor on Fortran
 ply>=3.6
+
+# Optional, kanren-style relation helpers
+git+https://github.com/pythological/kanren.git#egg=kanren