refactor: extract modules from Install_rules

src/dune_rules/install/stanzas_to_entries.mli

@@ -0,0 +1,2 @@
+val stanzas_to_entries :
+  Super_context.t -> Install.Entry.Sourced.t list Package.Name.Map.t Memo.t

src/dune_rules/package_paths.ml

@@ -0,0 +1,33 @@
+open Import
+
+let opam_file (ctx : Context.t) (pkg : Package.t) =
+  let opam_file = Package.opam_file pkg in
+  let exists =
+    match pkg.has_opam_file with
+    | Exists b -> b
+    | Generated -> true
+  in
+  if exists then Some (Path.Build.append_source ctx.build_dir opam_file)
+  else None
+
+let meta_file (ctx : Context.t) pkg =
+  Path.Build.append_source ctx.build_dir (Package.meta_file pkg)
+
+let deprecated_meta_file (ctx : Context.t) pkg name =
+  Path.Build.append_source ctx.build_dir (Package.deprecated_meta_file pkg name)
+
+let build_dir (ctx : Context.t) (pkg : Package.t) =
+  let dir = Package.dir pkg in
+  Path.Build.append_source ctx.build_dir dir
+
+let dune_package_file ctx pkg =
+  let name = Package.name pkg in
+  Path.Build.relative (build_dir ctx pkg)
+    (Package.Name.to_string name ^ ".dune-package")
+
+let deprecated_dune_package_file ctx pkg name =
+  Path.Build.relative (build_dir ctx pkg)
+    (Package.Name.to_string name ^ ".dune-package")
+
+let meta_template ctx pkg =
+  Path.Build.extend_basename (meta_file ctx pkg) ~suffix:".template"

src/dune_rules/package_paths.mli

@@ -0,0 +1,17 @@
+open Import
+
+val opam_file : Context.t -> Package.t -> Path.Build.t option
+
+val deprecated_meta_file :
+  Context.t -> Package.t -> Package.Name.t -> Path.Build.t
+
+val dune_package_file : Context.t -> Package.t -> Path.Build.t
+
+val meta_file : Context.t -> Package.t -> Path.Build.t
+
+val meta_template : Context.t -> Package.t -> Path.Build.t
+
+val deprecated_dune_package_file :
+  Context.t -> Package.t -> Package.Name.t -> Path.Build.t
+
+val build_dir : Context.t -> Package.t -> Path.Build.t