added a half-assed version-less mode to cave-rdep

bin/cave-rdep

@@ -5,25 +5,64 @@ import glob
 import re
 import sys
 
+def is_a_version(token):
+	"""
+	Returns True iff token is a portage version spec (i.e. contains only numbers or ".").
+	"""
+	
+	for A in token:
+		a = ord(A)
+		if not (0x30 <= a <= 0x39 or a == 0x2e):
+			return False
+	
+	return True
+
+def strip_version(atom):
+	"""
+	Removes the =version-123 spec from a portage atom.
+	
+	Works like 99% of the time. Good enough for the girls I go out with.
+	"""
+	
+	parts = atom[1:].split("-")
+	wanted = []
+	
+	for part in parts:
+		if is_a_version(part):
+			break
+		
+		wanted.append(part)
+	
+	return "-".join(wanted)
+
 def grep(exp, filename):
 	with open(filename) as f:
 		matches = re.findall(exp, f.read())
 	
 	return matches
 
-def find_reverse_deps(deps):
+def find_reverse_deps(deps, version=True):
 	all_dep_files = glob.glob("/var/db/pkg/*/*/*DEPEND")
 	
 	regexp = "(%s)[^:]*:[^/]+/[^=]+=" %("|".join(deps))
 	matching_files = set(f for f in all_dep_files if grep(regexp, f))
-	atoms = set("=" + f[12:].rsplit("/", 1)[0] for f in matching_files)
+	atoms = {"=" + f[12:].rsplit("/", 1)[0] for f in matching_files}
+	
+	if not version:
+		atoms = {strip_version(a) for a in atoms}
 	
 	return atoms
 
-
 if __name__ == "__main__":
 	if len(sys.argv) > 1:
-		atoms = find_reverse_deps(sys.argv[1:])
+		if sys.argv[1] == "-v":
+			version = False
+			targets = sys.argv[2:]
+		else:
+			version = True
+			targets = sys.argv[1:]
+		
+		atoms = find_reverse_deps(targets, version)
 		print(" ".join(sorted(atoms)))
 	else:
 		print("Usage: %s DEPENDENCY [more DEPENDENCIES...]" %(sys.argv[0]))