First attempt to include dry run functionality

sequencer/sequencer.sh

@@ -13,6 +13,7 @@ VERSION_MINOR=0
 ## Start of generic script part
 
 QUIET=0
+DRY=0
 VERBOSE=0
 ERNO=0
 MAX_STEP=255
@@ -25,6 +26,8 @@ helpSequencer() {
   echo "Usage: ${0##*/} [OPTIONS] [STEP NUMBER(s) or ALIAS]" 
   echo
   echo " [OPTIONS]"
+  echo "  --dry-run, -d : Only print to console what would be done"
+  echo "                  ! Attention - Sequence must support this"
   echo "  --help, -h    : Display help"
   echo "  --quiet, -q   : Don't ask for permission to execute steps"
   echo "                  If called without starting step number, only this help is shown"
@@ -98,6 +101,11 @@ endReturn() {
 # if all fails, a log file is created with the conflicts to be resolved by the user
 addConf() {
   echo -n "Writing $2 ... "
+  if [ "$DRY" -ne 0 ] ; then
+    echo "dry-run"
+    return 0;
+  fi
+
   # try writing config directly
   if [ ! -f "$2" ] ; then
     echo "$1" > "$2"
@@ -336,7 +344,9 @@ showVersion() {
 
 exe() {
   arr=("$@")
-  if [ $VERBOSE -eq 1 ] ; then
+  if [ $DRY -ne 0 ] ; then
+    echo -e "\n-- ${arr[@]}"
+  elif [ $VERBOSE -eq 1 ] ; then
     (set -x; "${arr[@]}")
   else
     "${arr[@]}"
@@ -349,6 +359,11 @@ main() {
   # options check
   for arg in "$@" ; do
     case "$arg" in
+      --dry-run|-d) # shows what would be done
+        DRY=1
+        QUIET=1
+        shift
+        ;;
       --help|-h) # show only help
         displayHelp
         exit 0;
@@ -395,6 +410,14 @@ main() {
       exit 1;
     fi
   fi
+  
+  if [ $DRY -ne 0 ] ; then
+    echo
+    echo "[WARN] Dry run active."
+    echo "       Printed commands may not be accurate (e.g. quotation incorrect)"
+    echo "       Sequence may ignore dry run"
+    read -p "Press enter to continue or Ctrl + c to abort"
+  fi
 
   parseAlias