feat: add stt-ptt package

pkgs/default.nix

@@ -7,6 +7,7 @@
   mem0 = pkgs.callPackage ./mem0 {};
   msty-studio = pkgs.callPackage ./msty-studio {};
   pomodoro-timer = pkgs.callPackage ./pomodoro-timer {};
+  stt-ptt = pkgs.callPackage ./stt-ptt {};
   tuxedo-backlight = pkgs.callPackage ./tuxedo-backlight {};
   zellij-ps = pkgs.callPackage ./zellij-ps {};
 }

pkgs/stt-ptt/default.nix

@@ -0,0 +1,91 @@
+{
+  lib,
+  stdenv,
+  writeShellScriptBin,
+  whisper-cpp,
+  wtype,
+  libnotify,
+  pipewire,
+  busybox,
+}: let
+  script = writeShellScriptBin "stt-ptt" ''
+    #!/usr/bin/env bash
+    # stt-ptt - Push to Talk Speech to Text
+
+    CACHE_DIR="''${XDG_CACHE_HOME:-$HOME/.cache}/stt-ptt"
+    MODEL_DIR="''${XDG_DATA_HOME:-$HOME/.local/share}/stt-ptt/models"
+    AUDIO="$CACHE_DIR/stt.wav"
+    PID_FILE="$CACHE_DIR/stt.pid"
+
+    # Configurable via environment
+    STT_MODEL="''${STT_MODEL:-$MODEL_DIR/ggml-large-v3-turbo.bin}"
+    STT_NOTIFY_TIMEOUT="''${STT_NOTIFY_TIMEOUT:-3000}"
+
+    NOTIFY="${libnotify}/bin/notify-send"
+    PW_RECORD="${pipewire}/bin/pw-record"
+    WHISPER="${whisper-cpp}/bin/whisper-cli"
+    WTYPE="${wtype}/bin/wtype"
+    MKDIR="${busybox}/bin/mkdir"
+    RM="${busybox}/bin/rm"
+    CAT="${busybox}/bin/cat"
+    KILL="${busybox}/bin/kill"
+    TR="${busybox}/bin/tr"
+    SED="${busybox}/bin/sed"
+
+    # Ensure cache directory exists
+    "$MKDIR" -p "$CACHE_DIR"
+
+    case "''${1:-}" in
+        start)
+            "$RM" -f "$AUDIO" "$PID_FILE"
+            "$NOTIFY" -t "$STT_NOTIFY_TIMEOUT" -a "stt-ptt" "Recording..."
+            "$PW_RECORD" --rate=16000 --channels=1 "$AUDIO" &
+            echo $! > "$PID_FILE"
+            ;;
+        stop)
+            [[ -f "$PID_FILE" ]] && "$KILL" "$("$CAT" "$PID_FILE")" 2>/dev/null
+            "$RM" -f "$PID_FILE"
+
+            if [[ -f "$AUDIO" ]]; then
+                if [[ ! -f "$STT_MODEL" ]]; then
+                    "$NOTIFY" -t "$STT_NOTIFY_TIMEOUT" -a "stt-ptt" "Error: Model not found at $STT_MODEL"
+                    "$RM" -f "$AUDIO"
+                    exit 1
+                fi
+                text=$("$WHISPER" -m "$STT_MODEL" -f "$AUDIO" -np -nt 2>/dev/null | "$TR" -d '\n' | "$SED" 's/^[[:space:]]*//;s/[[:space:]]*$//')
+                "$RM" -f "$AUDIO"
+                [[ -n "$text" ]] && "$WTYPE" -- "$text"
+            fi
+            ;;
+        *)
+            echo "Usage: stt-ptt {start|stop}"
+            echo ""
+            echo "Environment variables:"
+            echo "  STT_MODEL          - Path to whisper model (default: \$XDG_DATA_HOME/stt-ptt/models/ggml-large-v3-turbo.bin)"
+            echo "  STT_NOTIFY_TIMEOUT - Notification timeout in ms (default: 3000)"
+            exit 1
+            ;;
+    esac
+  '';
+in
+  stdenv.mkDerivation {
+    pname = "stt-ptt";
+    version = "0.1.0";
+
+    dontUnpack = true;
+
+    # No buildInputs needed - all runtime deps are hardcoded with full nix store paths in the script
+
+    installPhase = ''
+      mkdir -p "$out/bin"
+      ln -s ${script}/bin/stt-ptt "$out/bin/stt-ptt"
+    '';
+
+    meta = with lib; {
+      description = "Push to Talk Speech to Text using Whisper";
+      homepage = "https://code.m3ta.dev/m3tam3re/nixpkgs";
+      license = licenses.mit;
+      platforms = platforms.linux;
+      mainProgram = "stt-ptt";
+    };
+  }