install script

install.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+set -e
+
+OS=$(uname -s | tr 'A-Z' 'a-z')
+
+ARCH=$(uname -m)
+case "$ARCH" in
+	x86_64)
+		ARCH=amd64
+		;;
+	aarch64|arm64)
+		ARCH=arm64
+		;;
+	*)
+		echo "Unsupported architecture: $ARCH" >&2
+		exit 1
+		;;
+esac
+
+echo "Resolving latest version..."
+
+VERSION=$(curl -sL https://api.github.com/repos/coalaura/idk/releases/latest | grep -Po '"tag_name": *"\K.*?(?=")')
+
+if ! printf '%s\n' "$VERSION" | grep -Eq '^v[0-9]+\.[0-9]+\.[0-9]+$'; then
+	echo "Error: '$VERSION' is not in vMAJOR.MINOR.PATCH format" >&2
+	exit 1
+fi
+
+rm -f /tmp/idk
+
+BIN="idk_${VERSION}_${OS}_${ARCH}"
+URL="https://github.com/coalaura/idk/releases/download/${VERSION}/${BIN}"
+
+echo "Downloading ${BIN}..."
+
+if ! curl -sL "$URL" -o /tmp/idk; then
+	echo "Error: failed to download $URL" >&2
+	exit 1
+fi
+
+trap 'rm -f /tmp/idk' EXIT
+
+chmod +x /tmp/idk
+
+echo "Installing to /usr/local/bin/idk requires sudo"
+
+if ! sudo install -m755 /tmp/idk /usr/local/bin/idk; then
+	echo "Error: install failed" >&2
+	exit 1
+fi
+
+echo "idk $VERSION installed to /usr/local/bin/idk"