fix: fix errors occurring when refering to input func via rules.<rule…

…name>.input (#1669)

* fix: fix errors occurring when refering to input func via rules.<rulename>.input

* skip win

* fix for cases when a prefix is provided

snakemake/io.py

@@ -1443,6 +1443,9 @@ def git_content(git_file):
 
 def strip_wildcard_constraints(pattern):
     """Return a string that does not contain any wildcard constraints."""
+    if is_callable(pattern):
+        # do not apply on e.g. input functions
+        return pattern
 
     def strip_constraint(match):
         return "{{{}}}".format(match.group("name"))

snakemake/rules.py

@@ -1270,7 +1270,23 @@ def output(self):
 
     @lazy_property
     def input(self):
-        return self.rule.input._stripped_constraints()
+        def modify_callable(item):
+            if is_callable(item):
+                # For callables ensure that the rule's original path modifier is applied as well.
+
+                def inner(wildcards):
+                    return self.rule.apply_path_modifier(
+                        item(wildcards), self.rule.input_modifier, property="input"
+                    )
+
+                return inner
+            else:
+                # For strings, the path modifier has been already applied.
+                return item
+
+        return InputFiles(
+            toclone=self.rule.input, strip_constraints=True, custom_map=modify_callable
+        )
 
     @lazy_property
     def params(self):

tests/test_module_input_func/Snakefile

@@ -0,0 +1,14 @@
+module mod1:
+    snakefile:
+        "module1/Snakefile"
+    prefix:
+        "test/"
+
+
+use rule * from mod1 as mod1_*
+
+
+rule all:
+    input:
+        rules.mod1_all.input,
+    default_target: True

tests/test_module_input_func/expected-results/test/results/C.txt

@@ -0,0 +1 @@
+C

tests/test_module_input_func/module1/Snakefile

@@ -0,0 +1,15 @@
+def txt_output(wildcards):
+    return ["results/C.txt"]
+
+
+rule all:
+    input:
+        txt_output
+
+
+rule txt:
+    output:
+        "results/C.txt"
+    shell:
+        "echo 'C' "
+        ">{output} "

tests/tests.py

@@ -1646,6 +1646,11 @@ def test_retries():
     run(dpath("test_retries"))
 
 
+@skip_on_windows  # OS agnostic
+def test_module_input_func():
+    run(dpath("test_module_input_func"))
+
+
 @skip_on_windows  # the testcase only has a linux-64 pin file
 def test_conda_pin_file():
     run(dpath("test_conda_pin_file"), use_conda=True)