Scaffold file comparison structure

src/check.sh

@@ -6,4 +6,5 @@ check() {
   log debug "collected bkp files:\n$bkp_files"
 
   scan_packages
+  merge_base "$base_files"
 }

src/configuration.sh

@@ -15,7 +15,7 @@ scan_directory() {
     done
   fi
 
-  echo "$files"
+  printf "%b" "$files"
 }
 
 scan_packages() {

src/file/merge_base.sh

@@ -0,0 +1,20 @@
+merge_base() {
+  local base_files="$1"
+  local strategy=
+
+  for file in $base_files; do
+    log debug "[merge-base] Processing $file"
+    local absolute_path="$(echo "$file" | sed 's/^base//')"
+    log debug "[merge-base] Absolute path: $absolute_path"
+    local config_path="$CONFIG_ROOT/$file"
+    log debug "[merge-base] Config path: $config_path"
+
+    if diff "$absolute_path" "$config_path" > /dev/null; then
+      log debug "[merge-base] Files match"
+    else
+      log debug "[merge-base] Files differ"
+      strategy="$(ask "Configuration and system files differ" "Overwrite system,Overwrite config,Show difference")"
+      log debug "[merge-base] Chosen strategy: $strategy"
+    fi
+  done
+}

src/index.sh

@@ -9,3 +9,5 @@
 . "$TORI_ROOT/src/package/validate_input_packages.sh"
 . "$TORI_ROOT/src/package/package_conflict_input_parser.sh"
 . "$TORI_ROOT/src/package/update_package_cache.sh"
+
+. "$TORI_ROOT/src/file/merge_base.sh"

src/utility.sh

@@ -5,11 +5,11 @@ log() {
   local message="$2"
 
   print_user_message() {
-    echo "[tori] $(date "+%H:%M:%S"): $1" 1>&2
+    printf "%b\n" "[tori] $(date "+%H:%M:%S"): $1" 1>&2
   }
 
   print_debug_message() {
-    echo "$(date "+%H:%M:%N") $1" 1>&2
+    printf "%b\n" "$(date "+%H:%M:%N") $1" 1>&2
   }
 
   if [ -z "$DEBUG" ]; then
@@ -43,6 +43,39 @@ log() {
   fi
 }
 
+confirm() {
+  local question="$1"
+  local answer=
+  read -rp "$question [y/N] " answer
+
+  if [ "$answer" == y ] || [ "$answer" == Y ]; then
+    return 0;
+  else
+    return 1;
+  fi
+}
+
+ask() {
+  local question="$1"
+  local options="$2"
+  local answer=
+  local options_count=0
+  local dialog_options=
+
+  local IFS=,
+  for option in $options; do
+    _=$((options_count+=1))
+    dialog_options="$dialog_options\n [$options_count] $option"
+  done;
+  IFS=
+
+  printf "%s" "$question" >&2
+  printf "%b" "$dialog_options" >&2
+  printf "\n%s" "Choose an option [1-$options_count] " >&2
+  read -r answer
+  echo "$answer"
+}
+
 set_opts() {
   local target="$1"
   local sign=