add dircp

diff --git a/dircp b/dircp
new file mode 100755 (executable)
index 0000000..2f4c4c9
--- /dev/null
+++ b/dircp
@@ -0,0 +1,33 @@
+#!/bin/bash
+# Copyright (C) 2016 Ian Kelling
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+dircp() {
+    local help="Usage: dircp [-h|--help] DIR TARGET
+Copy a directory structure
+Doesn't overwrite any existing files."
+    case $1 in
+        -h|--help) echo "$help"; return ;;
+    esac
+    [[ $# == 2 ]] || { echo "error: need 2 arguments, got $@"; return 1; }
+    [[ -d $1 ]] || { echo "error: $1 is not a directory"; return 1; }
+    if [[ -e $2 && ! -d $2 ]]; then
+        echo "error: $2 exists and is not a directory"
+        return 1
+    fi
+    while read -rd ''; do
+        mkdir -p "$2/$REPLY"
+    done < <(find "$1" -type d -printf '%P\0')
+}
+dircp "$@"