rust script to automatically add meta.mainProgram to nixpkgs

with thanks to pennae, who showed that this approach was possible
(and wrote the status-report widget)
 https://github.com/pennae/nix-doc-munge

1 files changed, 30 insertions, 0 deletions

diff --git a/get-candidates.nix b/get-candidates.nix
new file mode 100644
index 0000000..b9b6a07
--- /dev/null
+++ b/get-candidates.nix
@@ -0,0 +1,30 @@
+let
+  pkgs = import ../../../clones/nixpkgs { };
+  lib = pkgs.lib;
+
+  dbFile = builtins.storePath <nixpkgs/programs.sqlite>;
+  dbJson = pkgs.runCommand "json" { } ''
+    ${lib.getExe pkgs.sqlite} ${dbFile} '.mode json' "
+      SELECT package, system, json_group_array(name) AS names
+      FROM Programs
+      WHERE system = 'x86_64-linux'
+      GROUP BY package, system;
+    " > $out
+  '';
+
+  programs = lib.importJSON dbJson;
+
+  # the channel is older than nixpkgs master, so some attributes may no longer exist
+  # (but we edit on master, hence need that for e.g. positions)
+  stillExists = row: lib.hasAttrByPath (lib.splitString "." row.package) pkgs;
+  programs2 = lib.filter stillExists programs;
+
+  getPackage = e: lib.getAttrFromPath (lib.splitString "." e) pkgs;
+  isTrivial = row:
+    builtins.length (builtins.fromJSON row.names) == 1
+    && !((getPackage row.package).meta ? "mainProgram");
+  missing = lib.filter isTrivial programs2;
+in
+
+pkgs.writeText "missing"
+  (builtins.toJSON (map (row: { pos = (getPackage row.package).meta.position or null; name = builtins.head (builtins.fromJSON row.names); }) missing))