skeleton: launcher, entrypoint, distro/log/prompt libs

lib/detect.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+# detect.sh — distro + arch detection. Exports DISTRO and ARCH.
+
+detect_distro() {
+  DISTRO="unknown"
+  ARCH="$(uname -m)"
+  case "$ARCH" in
+    x86_64)        ARCH="amd64" ;;
+    aarch64|arm64) ARCH="arm64" ;;
+  esac
+
+  if [[ -f /etc/os-release ]]; then
+    # shellcheck disable=SC1091
+    . /etc/os-release
+    case "${ID:-}" in
+      debian|ubuntu) DISTRO="debian" ;;
+      arch)          DISTRO="arch" ;;
+      *)
+        case "${ID_LIKE:-}" in
+          *debian*) DISTRO="debian" ;;
+          *arch*)   DISTRO="arch" ;;
+        esac ;;
+    esac
+  fi
+
+  export DISTRO ARCH
+}
+
+detect_distro

lib/log.sh

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+#!/usr/bin/env bash
+# log.sh — tiny color log helpers.
+
+log()  { printf '\033[1;34m>>\033[0m %s\n' "$*"; }
+warn() { printf '\033[1;33m!!\033[0m %s\n' "$*" >&2; }
+err()  { printf '\033[1;31mxx\033[0m %s\n' "$*" >&2; }
+ok()   { printf '\033[1;32mok\033[0m %s\n' "$*"; }
+
+# run a command as root when not already root
+sudo_() { if (( EUID == 0 )); then "$@"; else sudo "$@"; fi; }
+
+# run a command AS the invoking (non-root) user — used for AUR builds, etc.
+# when root: drop to SUDO_USER (or USER) via runuser; when not root: run directly.
+as_user() {
+  local u="$USER"
+  if (( EUID == 0 )); then
+    u="${SUDO_USER:-$USER}"
+    command -v runuser >/dev/null 2>&1 && runuser -u "$u" -- "$@" || su "$u" -c "$*"
+  else
+    "$@"
+  fi
+}

lib/prompt.sh

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+#!/usr/bin/env bash
+# prompt.sh — plain y/N prompts.
+
+# ask "prompt?" [default y|n]  -> sets REPLY
+ask() {
+  local p="$1" d="${2:-y}" hint
+  if [[ "$d" == "y" ]]; then hint="[Y/n]"; else hint="[y/N]"; fi
+  read -rp "$p $hint " REPLY
+  [[ -z "$REPLY" ]] && REPLY="$d"
+}
+
+# yn "prompt?" [default]  -> returns 0 (true) if answer is yes
+yn() {
+  ask "$1" "${2:-y}"
+  [[ "$REPLY" =~ ^[Yy]$ ]]
+}
+
+# confirm_once "prompt?" default  -> for destructive single confirm
+confirm_once() { yn "$1" "${2:-n}"; }