Added talisman hook script.

See https://github.com/thoughtworks/talisman

dot_talisman/bin/executable_talisman_hook_script

@@ -0,0 +1,92 @@
+#!/bin/bash
+shopt -s extglob
+
+# set TALISMAN_DEBUG="some-non-empty-value" in the env to get verbose output when the hook or talisman is running
+function echo_debug() {
+	MSG="$@"
+	[[ -n "${TALISMAN_DEBUG}" ]] && echo "${MSG}"
+}
+
+function echo_warning() {
+	echo -ne $(tput setaf 3) >&2
+	echo "$1" >&2
+	echo -ne $(tput sgr0) >&2
+}
+
+function echo_error() {
+	echo -ne $(tput setaf 1) >&2
+	echo "$1" >&2
+	echo -ne $(tput sgr0) >&2
+}
+
+function echo_success() {
+	echo -ne $(tput setaf 2)
+	echo "$1" >&2
+	echo -ne $(tput sgr0)
+}
+
+function toLower(){
+	echo "$1" | awk '{print tolower($0)}'
+}
+
+declare HOOKNAME="pre-commit"
+NAME=$(basename $0)
+ORG_REPO=${ORG_REPO:-'thoughtworks/talisman'}
+
+# given the various symlinks, this script may be invoked as
+#     'pre-commit', 'pre-push', 'talisman_hook_script pre-commit' or 'talisman_hook_script pre-push'
+case "$NAME" in
+pre-commit* | pre-push*) HOOKNAME="${NAME}" ;;
+talisman_hook_script)
+	if [[ $# -gt 0 && $1 =~ pre-push.* ]]; then
+		HOOKNAME="pre-push"
+	fi
+	;;
+*)
+	echo "Unexpected invocation. Please check invocation name and parameters"
+	exit 1
+	;;
+esac
+
+TALISMAN_UPGRADE_CONNECT_TIMEOUT=${TALISMAN_UPGRADE_CONNECT_TIMEOUT:-10}
+function check_and_upgrade_talisman_binary() {
+	if [[ -n "${TALISMAN_HOME:-}" && "$TALISMAN_SKIP_UPGRADE" != "true" ]]; then
+		LATEST_VERSION=$(curl --connect-timeout $TALISMAN_UPGRADE_CONNECT_TIMEOUT -Is https://github.com/${ORG_REPO}/releases/latest | grep -iE "^location:" | grep -o '[^/]\+$' | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+')
+		CURRENT_VERSION=$(/h//.talisman/bin/talisman_windows_amd64.exe --version | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+')
+		if [ -z "$LATEST_VERSION" ]; then
+			echo_warning "Failed to retrieve latest Talisman version, skipping update."
+		elif [ "$LATEST_VERSION" != "$CURRENT_VERSION" ]; then
+			echo ""
+			echo_warning "Your version of Talisman is outdated. Updating Talisman to v${LATEST_VERSION}"
+			curl --silent https://raw.githubusercontent.com/${ORG_REPO}/master/global_install_scripts/update_talisman.bash >/tmp/update_talisman.bash && /bin/bash /tmp/update_talisman.bash
+		else
+			echo_debug "Talisman version up-to-date, skipping update"
+		fi
+	fi
+}
+
+check_and_upgrade_talisman_binary
+# Here HOOKNAME should be either 'pre-commit' (default) or 'pre-push'
+echo_debug "Firing ${HOOKNAME} hook"
+
+# Don't run talisman checks in a git repo, if we find a .talisman_skip or .talisman_skip.pre-<commit/push> file in the repo
+if [[ -f .talisman_skip || -f .talisman_skip.${HOOKNAME} ]]; then
+	echo_debug "Found skip file. Not performing checks"
+	exit 0
+fi
+
+TALISMAN_DEBUG="$(toLower "${TALISMAN_DEBUG}")"
+DEBUG_OPTS=""
+[[ "${TALISMAN_DEBUG}" == "true" ]] && DEBUG_OPTS="-d"
+
+TALISMAN_INTERACTIVE="$(toLower "${TALISMAN_INTERACTIVE}")"
+INTERACTIVE=""
+if [ "${TALISMAN_INTERACTIVE}" == "true" ]; then
+    INTERACTIVE="-i"
+	  [[ "${HOOKNAME}" == "pre-commit" ]] && exec < /dev/tty || echo_warning "talisman pre-push hook cannot be invoked in interactive mode currently"
+fi
+
+CMD="/h//.talisman/bin/talisman_windows_amd64.exe ${DEBUG_OPTS} --githook ${HOOKNAME} ${INTERACTIVE}"
+echo_debug "ARGS are $@"
+echo_debug "Executing: ${CMD}"
+${CMD}