Add zero-indexed register

flake.lock

@@ -0,0 +1,59 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1696757521,
+        "narHash": "sha256-cfgtLNCBLFx2qOzRLI6DHfqTdfWI+UbvsKYa3b3fvaA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2646b294a146df2781b1ca49092450e8a32814e1",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,43 @@
+{
+  description = "kakoune (patch)";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (sys:
+    let
+      pkgs = nixpkgs.legacyPackages.${sys};
+      kak = pkgs.stdenv.mkDerivation rec {
+        pname = "kakoune";
+        version = "2022.10.31";
+        src = ./. ;
+        makeFlags = [ "debug=no" "PREFIX=${placeholder "out"}" ];
+
+        preConfigure = ''
+          export version="v${version}"
+        '';
+
+        enableParallelBuilding = true;
+
+        doInstallCheck = true;
+        installCheckPhase = ''
+          $out/bin/kak -ui json -e "kill 0"
+        '';
+
+        postInstall = ''
+          # make share/kak/autoload a directory, so we can use symlinkJoin with plugins
+          cd "$out/share/kak"
+          autoload_target=$(readlink autoload)
+          rm autoload
+          mkdir autoload
+          ln -s --relative "$autoload_target" autoload
+        '';
+      };
+    in rec {
+      packages.kak = kak;
+      packages.default = packages.kak;
+    }
+  );
+}

src/input_handler.cc

@@ -198,6 +198,7 @@ constexpr StringView register_doc =
     "%:     buffer name\n"
     ".:     selection contents\n"
     "#:     selection index\n"
+    "$:     selection index (zero-indexed)\n"
     "_:     null register\n"
     "\":     default yank/paste register\n"
     "@:     default macro register\n"

src/main.cc

@@ -436,6 +436,17 @@ void register_registers()
             return res;
         }));
 
+    register_manager.add_register('$', make_dyn_reg(
+        "$",
+        [](const Context& context) {
+            const size_t count = context.selections().size();
+            StringList res;
+            res.reserve(count);
+            for (size_t i = 0; i < count; ++i)
+                res.push_back(to_string((int)i));
+            return res;
+        }));
+
     for (size_t i = 0; i < 10; ++i)
     {
         register_manager.add_register('0'+i, make_dyn_reg(

src/register_manager.cc

@@ -67,6 +67,7 @@ static const HashMap<StringView, Codepoint> reg_names {
     { "percent", '%' },
     { "dot", '.' },
     { "hash", '#' },
+    { "dollar", '$' },
     { "underscore", '_' },
     { "colon", ':' }
 };