Parse out version info and insert it to the manifest

zapp/compiler/__main__.py

@@ -196,6 +196,8 @@ def rezip_wheels(opts, manifest):
         if s["source"].endswith("/WHEEL")
     ]
 
+    manifest["requirements"] = {}
+
     # Zip up the wheels and insert wheel records to the manifest
     for w in wheels:
         # Try to cheat and hit in the local cache first rather than building wheels every time
@@ -223,6 +225,9 @@ def rezip_wheels(opts, manifest):
             # Insert a new wheel source
             manifest["wheels"][wn] = {"hashes": [], "source": wf}
 
+            # Insert the requirement
+            manifest["requirements"][w["meta"]["Name"]] = w["meta"]["Version"]
+
     return manifest
 
 

zapp/support/manifest.py

@@ -1,5 +1,6 @@
 """The Zapp runtime manifest API."""
 
+import argparse
 import json
 from copy import deepcopy
 from importlib.resources import open_text
@@ -35,4 +36,20 @@ def manifest():
         return json.load(fp)
 
 
+PARSER = argparse.ArgumentParser()
+PARSER.add_argument("--json", action="store_const", const="json", dest="format", default="json")
+PARSER.add_argument("--requirements", action="store_const", const="requirements", dest="format")
+
+
+if __name__ == "__main__":
+    opts, args = PARSER.parse_known_args()
+
+    if opts.format == "json":
+        print(json.dumps(manifest()))
+
+    elif opts.format == "requirements":
+        for req, rev in manifest()["requirements"].items():
+            print("{}=={}".format(req, rev))
+
+
 __all__ = ["manifest"]