prepare for symclone.

From now on, _src.posix will be the single source of truth.
And _home(.*) will symlink into it.

symclone.sh

@@ -0,0 +1,58 @@
+#! /usr/bin/env bash
+
+set -e
+
+# Source directory (existing structure with files)
+SRC_DIR=_src.posix
+
+# Target directory (new structure with symlinks)
+DEST_DIR="${1:?}"
+
+# Check if both arguments are provided
+if [[ -z "$SRC_DIR" || -z "$DEST_DIR" ]]; then
+    echo "Usage: $0 <source_directory> <destination_directory>"
+    exit 1
+fi
+
+# Ensure source directory exists
+if [[ ! -d "$SRC_DIR" ]]; then
+    echo "Error: Source directory '$SRC_DIR' does not exist."
+    exit 1
+fi
+
+# Create destination directory if it does not exist
+mkdir -p "$DEST_DIR"
+
+# Find all directories and recreate them in the destination
+find "$SRC_DIR" -type d -mindepth 1 | while read -r dir; do
+    mkdir -p "$DEST_DIR/${dir#$SRC_DIR/}"
+done
+
+# Function to get relative path without realpath or python
+relpath() {
+    local target=$1
+    local base=$2
+    local target_abs=$(cd "$(dirname "$target")" && pwd)/$(basename "$target")
+    local base_abs=$(cd "$base" && pwd)
+    local common_part="$base_abs"
+    local back=""
+
+    while [[ "${target_abs#$common_part}" == "$target_abs" ]]; do
+        common_part=$(dirname "$common_part")
+        back="../$back"
+    done
+
+    echo "${back}${target_abs#$common_part/}"
+}
+
+# Find all files and create symbolic links in the destination
+find "$SRC_DIR" -type f | while read -r file; do
+    # Determine the relative path for the symlink
+    target_file="${file#$SRC_DIR/}"
+    src_relative_path=$(relpath "$file" "$(dirname "$DEST_DIR/$target_file")")
+
+    # Create the symlink with relative path
+    ln -vs "$src_relative_path" "$DEST_DIR/$target_file"
+done
+
+echo "Symbolic links created successfully in '$DEST_DIR'."