Bundle gum binary with gniza installation

- Install script auto-downloads gum from GitHub releases into
  $INSTALL_DIR/bin/gum (supports x86_64, arm64, armv7, i386)
- Skips download if gum is already installed system-wide
- bin/gniza adds $GNIZA_DIR/bin to PATH so bundled gum is found
- No system package installation required

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -65,7 +65,9 @@ Root mode installs to `/usr/local/gniza`. User mode installs to `~/.local/share/
 ### Dependencies
 
 - **Required**: bash 4+, rsync
-- **Optional**: ssh, [gum](https://github.com/charmbracelet/gum) (TUI), curl (SMTP notifications), rclone (S3/GDrive)
+- **Optional**: ssh, curl (SMTP notifications), rclone (S3/GDrive)
+
+> **Note**: [gum](https://github.com/charmbracelet/gum) (TUI engine) is automatically downloaded during installation.
 
 ## Quick Start
 

bin/gniza

@@ -5,6 +5,9 @@ set -euo pipefail
 GNIZA_DIR="$(cd "$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")/.." && pwd)"
 export GNIZA_DIR
 
+# Add bundled binaries (gum) to PATH if present
+[[ -d "$GNIZA_DIR/bin" ]] && export PATH="$GNIZA_DIR/bin:$PATH"
+
 # ── Source libraries in dependency order ─────────────────────
 source "$GNIZA_DIR/lib/constants.sh"
 source "$GNIZA_DIR/lib/utils.sh"

scripts/install.sh

@@ -68,12 +68,61 @@ for cmd in bash rsync; do
     fi
 done
 
-for cmd in ssh gum curl; do
+for cmd in ssh curl; do
     if ! command -v "$cmd" &>/dev/null; then
         warn "Optional dependency not found: $cmd"
     fi
 done
 
+# ── Install bundled gum binary ───────────────────────────────
+GUM_VERSION="0.17.0"
+
+_detect_arch() {
+    local arch; arch=$(uname -m)
+    case "$arch" in
+        x86_64)  echo "x86_64" ;;
+        aarch64) echo "arm64" ;;
+        armv7*)  echo "armv7" ;;
+        i386|i686) echo "i386" ;;
+        *)       echo "" ;;
+    esac
+}
+
+if command -v gum &>/dev/null; then
+    info "gum already installed: $(command -v gum)"
+else
+    GUM_ARCH=$(_detect_arch)
+    if [[ -n "$GUM_ARCH" ]] && command -v curl &>/dev/null; then
+        GUM_URL="https://github.com/charmbracelet/gum/releases/download/v${GUM_VERSION}/gum_${GUM_VERSION}_Linux_${GUM_ARCH}.tar.gz"
+        info "Downloading gum v${GUM_VERSION} (${GUM_ARCH})..."
+        GUM_TMP=$(mktemp -d)
+        if curl -fsSL "$GUM_URL" | tar xz -C "$GUM_TMP" 2>/dev/null; then
+            mkdir -p "$INSTALL_DIR/bin"
+            # The tarball extracts to a subdirectory
+            if [[ -f "$GUM_TMP/gum_${GUM_VERSION}_Linux_${GUM_ARCH}/gum" ]]; then
+                cp "$GUM_TMP/gum_${GUM_VERSION}_Linux_${GUM_ARCH}/gum" "$INSTALL_DIR/bin/gum"
+            elif [[ -f "$GUM_TMP/gum" ]]; then
+                cp "$GUM_TMP/gum" "$INSTALL_DIR/bin/gum"
+            fi
+            if [[ -f "$INSTALL_DIR/bin/gum" ]]; then
+                chmod +x "$INSTALL_DIR/bin/gum"
+                info "Installed gum to $INSTALL_DIR/bin/gum"
+            else
+                warn "Failed to locate gum binary in archive"
+            fi
+        else
+            warn "Failed to download gum (TUI will not be available)"
+        fi
+        rm -rf "$GUM_TMP"
+    else
+        if [[ -z "${GUM_ARCH:-}" ]]; then
+            warn "Unsupported architecture for gum: $(uname -m)"
+        else
+            warn "curl not found, cannot download gum (TUI will not be available)"
+        fi
+    fi
+fi
+
 # ── Install files ────────────────────────────────────────────
 info "Installing to $INSTALL_DIR..."
 mkdir -p "$INSTALL_DIR"
@@ -140,5 +189,5 @@ echo "  Logs:    $LOG_DIR"
 echo ""
 echo "Get started:"
 echo "  gniza --help        Show CLI help"
-echo "  gniza               Launch TUI (requires gum)"
+echo "  gniza               Launch TUI"
 echo ""