Improve 'nix flake info' a bit

Example:

  $ nix flake info dwarffs
  ID:          dwarffs
  URI:         github:edolstra/dwarffs/a83d182fe3fe528ed6366a5cec3458bcb1a5f6e1
  Description: A filesystem that fetches DWARF debug info from the Internet on demand
  Revision:    a83d182fe3fe528ed6366a5cec3458bcb1a5f6e1
  Path:        /nix/store/grgd14kxxk8q4n503j87mpz48gcqpqw7-source

1 files changed, 8 insertions, 2 deletions

diff --git a/src/nix/flake.cc b/src/nix/flake.cc
index 7006ab989..4b8f1026e 100644
--- a/src/nix/flake.cc
+++ b/src/nix/flake.cc
@@ -40,13 +40,19 @@ void printFlakeInfo(Flake & flake, bool json) {
     if (json) {
         nlohmann::json j;
         j["id"] = flake.id;
-        j["location"] = flake.sourceInfo.storePath;
+        j["uri"] = flake.sourceInfo.flakeRef.to_string();
         j["description"] = flake.description;
+        if (flake.sourceInfo.rev)
+            j["revision"] = flake.sourceInfo.rev->to_string(Base16, false);
+        j["path"] = flake.sourceInfo.storePath;
         std::cout << j.dump(4) << std::endl;
     } else {
         std::cout << "ID:          " << flake.id << "\n";
+        std::cout << "URI:         " << flake.sourceInfo.flakeRef.to_string() << "\n";
         std::cout << "Description: " << flake.description << "\n";
-        std::cout << "Location:    " << flake.sourceInfo.storePath << "\n";
+        if (flake.sourceInfo.rev)
+            std::cout << "Revision:    " << flake.sourceInfo.rev->to_string(Base16, false) << "\n";
+        std::cout << "Path:        " << flake.sourceInfo.storePath << "\n";
     }
 }