Build with colors :)

README.md

@@ -28,7 +28,9 @@ Flags:
 - `SWITCH_PICO_LOG`: enable/disable UART logging on the Pico.
 
 ### Changing controller colours
-Edit `controller_color_config.h` (RGB values) and rebuild; the Switch will show the new colours on reconnect.
+`./build.sh` now writes a random colour into `controller_color_config.h` before building so the Switch shows a fresh colour when you flash.
+- Use `./build.sh --color FF00AA` (or `--color 12,34,56`) to pick a specific colour applied to the body/buttons/grips.
+- Use `./build.sh --keep-color` if you want to build without touching `controller_color_config.h`.
 
 ## Python bridge (recommended)
 Works on macOS, Windows, Linux. Uses SDL2 + pyserial.

build.sh

@@ -0,0 +1,126 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd -- "$(dirname "$0")" && pwd)"
+cd "$SCRIPT_DIR"
+
+CONFIG_FILE="$SCRIPT_DIR/controller_color_config.h"
+
+usage() {
+  cat <<'EOF'
+Usage: build.sh [--random-grip-color | --grip-color RRGGBB]
+  --random-grip-color    Randomize both grip colors before building.
+  --grip-color RRGGBB    Set both grip colors to the provided hex value.
+  --help                 Show this help message.
+
+Default behavior leaves controller_color_config.h unchanged.
+EOF
+}
+
+ensure_single_color_mode() {
+  local current_mode="$1"
+  local new_mode="$2"
+  if [[ "$current_mode" != "none" && "$current_mode" != "$new_mode" ]]; then
+    echo "Error: Choose either --random-grip-color or --grip-color, not both." >&2
+    exit 1
+  fi
+}
+
+update_grip_colors() {
+  local rgb_hex="$1"
+  local r="${rgb_hex:0:2}"
+  local g="${rgb_hex:2:2}"
+  local b="${rgb_hex:4:2}"
+
+  if [[ ! -f "$CONFIG_FILE" ]]; then
+    echo "Error: Cannot find $CONFIG_FILE" >&2
+    exit 1
+  fi
+
+  python - "$CONFIG_FILE" "$r" "$g" "$b" <<'PY'
+import re
+import sys
+path, r, g, b = sys.argv[1:5]
+
+try:
+    with open(path, "r", encoding="utf-8") as f:
+        text = f.read()
+except OSError as exc:
+    sys.stderr.write(f"Error reading {path}: {exc}\n")
+    sys.exit(1)
+
+def replace(name, val, data):
+    pattern = rf"(?m)^(#define\s+{name}\s+)0x[0-9A-Fa-f]{{2}}"
+    updated, count = re.subn(pattern, rf"\g<1>0x{val.upper()}", data)
+    if count == 0:
+        sys.stderr.write(f"Error: Could not find {name} in {path}\n")
+        sys.exit(1)
+    return updated
+
+for macro, val in [
+    ("SWITCH_COLOR_LEFT_GRIP_R", r),
+    ("SWITCH_COLOR_LEFT_GRIP_G", g),
+    ("SWITCH_COLOR_LEFT_GRIP_B", b),
+    ("SWITCH_COLOR_RIGHT_GRIP_R", r),
+    ("SWITCH_COLOR_RIGHT_GRIP_G", g),
+    ("SWITCH_COLOR_RIGHT_GRIP_B", b),
+]:
+    text = replace(macro, val, text)
+
+try:
+    with open(path, "w", encoding="utf-8") as f:
+        f.write(text)
+except OSError as exc:
+    sys.stderr.write(f"Error writing {path}: {exc}\n")
+    sys.exit(1)
+PY
+}
+
+GRIP_MODE="none"
+CUSTOM_COLOR=""
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --random-grip-color)
+      ensure_single_color_mode "$GRIP_MODE" "random"
+      GRIP_MODE="random"
+      shift
+      ;;
+    --grip-color)
+      ensure_single_color_mode "$GRIP_MODE" "custom"
+      GRIP_MODE="custom"
+      CUSTOM_COLOR="${2-}"
+      if [[ -z "$CUSTOM_COLOR" ]]; then
+        echo "Error: --grip-color requires a hex value like FF8800." >&2
+        exit 1
+      fi
+      shift 2
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "Unknown option: $1" >&2
+      usage
+      exit 1
+      ;;
+  esac
+done
+
+if [[ "$GRIP_MODE" == "random" ]]; then
+  CUSTOM_COLOR="$(printf "%02X%02X%02X" $((RANDOM % 256)) $((RANDOM % 256)) $((RANDOM % 256)))"
+elif [[ "$GRIP_MODE" == "custom" ]]; then
+  if ! [[ "$CUSTOM_COLOR" =~ ^[0-9A-Fa-f]{6}$ ]]; then
+    echo "Error: Color must be a 6-digit hex value like FF8800." >&2
+    exit 1
+  fi
+fi
+
+if [[ "$GRIP_MODE" != "none" ]]; then
+  update_grip_colors "$CUSTOM_COLOR"
+  echo "Grip color set to #$CUSTOM_COLOR in controller_color_config.h"
+fi
+
+cmake -S . -B build -DSWITCH_PICO_AUTOTEST=OFF -DSWITCH_PICO_LOG=OFF && cmake --build build
+/Users/joey/.pico-sdk/picotool/2.2.0-a4/picotool/picotool load /Users/joey/Projects/switch-pico/build/switch-pico.elf -fx