Improve backup functions

sdata/lib/functions.sh

@@ -309,3 +309,49 @@ function auto_get_git_submodule(){
     x git submodule update --init --recursive
   fi
 }
+
+function backup_clashing_targets(){
+  # For non-recursive dirs/files under target_dir, only backup those which clashes with the ones under source_dir
+  # However, ignore the ones listed in ignored_list
+
+  # Deal with arguments
+  local source_dir="$1"
+  local target_dir="$2"
+  local backup_dir="$3"
+  local -a ignored_list=("${@:4}")
+
+  # Find clash dirs/files, save as clash_list
+  local clash_list=()
+  local source_list=($(ls -A "$source_dir"))
+  local target_list=($(ls -A "$target_dir"))
+  local -A target_map
+  for i in "${target_list[@]}"; do
+    target_map["$i"]=1
+  done
+  for i in "${source_list[@]}"; do
+    if [[ -n "${target_map[$i]}" ]]; then
+      clash_list+=("$i")
+    fi
+  done
+  local -A delk
+  for del in "${ignored_list[@]}" ; do delk[$del]=1 ; done
+  for k in "${!clash_list[@]}" ; do
+    [ "${delk[${clash_list[$k]}]-}" ] && unset 'clash_list[k]'
+  done
+  clash_list=("${clash_list[@]}")
+
+  # Construct args_includes for rsync
+  local args_includes=()
+  for i in "${clash_list[@]}"; do
+    if [[ -d "$target_dir/$i" ]]; then
+      args_includes+=(--include="/$i/")
+      args_includes+=(--include="/$i/**")
+    else
+      args_includes+=(--include="/$i")
+    fi
+  done
+  args_includes+=(--exclude='*')
+
+  x mkdir -p $backup_dir
+  x rsync -av --progress "${args_includes[@]}" "$target_dir/" "$backup_dir/"
+}