scripts/generate-dependency-queue.py: rewrite

scripts/generate-dependency-queue.py

@@ -4,15 +4,32 @@ import sys
 priority_queue = []
 packages = json.load(sys.stdin)["packages"]
 
-def iter_packages(package_name):
-    package = next((package for package in packages if package["name"] == package_name), None)
-    if package is not None and package["source"] is None:
-        for dependency in package["dependencies"]:
-            iter_packages(dependency["name"])
-        if package_name not in priority_queue:
-            priority_queue.append(package_name)
+def sort_graph(unsorted):
+    sorted = []
+    while unsorted:
+        deadlock = True
+        for node, edges in list(unsorted.items()):
+            for edge in edges:
+                if edge in unsorted:
+                    break
+            else:
+                del unsorted[node]
+                sorted.append((node, edges))
+                deadlock = False
+        if deadlock:
+            raise Exception("deadlock")
+    return sorted
 
-iter_packages("keyfork")
-for package_name in priority_queue:
-    package = next((package for package in packages if package["name"] == package_name), None)
-    print(" ".join([package["name"], package["version"]]))
+packages_dict = {
+    package["name"]: [
+        dep["name"] for dep in package["dependencies"]
+        if dep["kind"] is None
+    ]
+    for package in packages if package["source"] is None
+}
+
+# iter_packages("keyfork")
+priority_queue = sort_graph(packages_dict.copy())
+for key, _ in priority_queue:
+    version = next(p["version"] for p in packages if p["name"] == key)
+    print(" ".join([key, version]))