fix dry run

hancho.py

@@ -549,9 +549,10 @@ async def dispatch(self):
             return self.abs_files_out
 
         # Make sure our output directories exist
-        for file_out in self.abs_files_out:
-            if dirname := path.dirname(file_out):
-                os.makedirs(dirname, exist_ok=True)
+        if not self.dryrun:
+            for file_out in self.abs_files_out:
+                if dirname := path.dirname(file_out):
+                    os.makedirs(dirname, exist_ok=True)
 
         # And flatten+expand our command list
         commands = await flatten_async(self, self.command)
@@ -574,7 +575,7 @@ async def dispatch(self):
             if self.verbose or self.debug:
                 log(f"Reason: {self.reason}")
                 for command in commands:
-                    log(f">>> {command}")
+                    log(f">>>{' (DRY RUN)' if self.dryrun else ''} {command}")
                 if self.debug:
                     log(self)
 
@@ -583,7 +584,7 @@ async def dispatch(self):
                 result = await self.run_command(command)
 
         # Task complete, check if it actually updated all the output files
-        if self.files_in and self.files_out:
+        if self.files_in and self.files_out and not self.dryrun:
             if second_reason := await self.needs_rerun():
                 raise ValueError(
                     f"Task '{desc}' still needs rerun after running!\n"

tests/test.py

@@ -15,6 +15,7 @@
 # calling hancho in src dir
 # meta deps changed
 # transitive dependencies
+# dry run not creating files/dirs
 
 # min delta seems to be 4 msec on linux, 1 msec on windows?
 # os.system("touch blahblah.txt")