Add cloneToWt script

Author: zolotov

Diff for: cloneToWt.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+# Creates new worktrees for all IntelliJ IDEA repositories pointing to a new release branch.
+# Usage: ./cloneToWt.sh <target directory> <branch>
+# Restrictions:
+#   None of the given Git repositories should have the branch with name <branch>.
+#   There should be a remote branch origin/<branch> from which a new local branch will be created by this script.
+#   You must use Git 2.5.0 or later.
+
+set -e # Any command which returns non-zero exit code will cause this shell script to exit immediately
+
+if [[ -z "$1" || -z "$2" ]] ; then
+  echo "
+  Usage:   ./cloneToWt.sh <target directory> <branch>
+  Example: ./cloneToWt.sh ~/intellij-go-143 143"
+  exit 1
+fi
+
+NEW_REPO="$1"
+BRANCH="$2"
+
+if [[ "$BRANCH" == origin/* ]]; then
+  BRANCH="${BRANCH/origin\//}"
+fi
+
+# Absolute path to directory containing existing IntelliJ IDEA repo (and this script as well)
+OLD_REPO="$(cd "`dirname "$0"`"; pwd)"
+ROOTS=("/")
+
+if [ -d "$NEW_REPO" ]; then
+  echo "Directory '$NEW_REPO' already exists"
+  exit 2
+fi
+
+for ROOT in ${ROOTS[@]}; do
+  if [[ ! -z `git --git-dir="${OLD_REPO}${ROOT}/.git" --work-tree="${OLD_REPO}${ROOT}" branch --list $BRANCH` ]]; then
+    echo "Branch '$BRANCH' already exists in $ROOT"
+    exit 3
+  fi
+done
+
+for ROOT in ${ROOTS[@]}; do
+  git --git-dir="${OLD_REPO}${ROOT}/.git" --work-tree="${OLD_REPO}${ROOT}" worktree add -b $BRANCH "${NEW_REPO}${ROOT}" origin/${BRANCH}
+done
+
+cp -a "$OLD_REPO/.idea/workspace.xml" "$NEW_REPO/.idea/"