Add possibility to -h to display info only for one specified step

New way to display step arguments by moving the cursor around with escape sequences

sequencer/sequencer.sh

@@ -7,8 +7,8 @@
 
 ## Version information
 
-VERSION_REV=13
-VERSION_MAJOR=3
+VERSION_REV=14
+VERSION_MAJOR=0
 VERSION_MINOR=0
 
 ## Start of generic script part
@@ -24,6 +24,7 @@ STEP_RETURN=255
 MAX_STEP=512
 ALIAS=
 CONTEXT_HELP=0
+CONTEXT_EXE=0
 SEQ_CONFIG_EDIT=0
 SEQ_CONFIG_NAME=".seqs"
 SEQ_CONFIG_FILE=
@@ -53,6 +54,10 @@ LIGHTCYAN= ; [ -t 1 ] && LIGHTCYAN='\033[1;36m'
 LIGHTGRAY= ; [ -t 1 ] && LIGHTGRAY='\033[0;37m'
 WHITE= ; [ -t 1 ] && WHITE='\033[1;37m'
 NC= ;[ -t 1 ] && NC='\033[0m' # No Color
+SAVE_POS_ALIAS= ;[ -t 1 ] && SAVE_POS_ALIAS='\033[1A\033[1C\033[s\033[1B\033[1C'
+SAVE_POS_EXE= ;[ -t 1 ] && SAVE_POS_EXE='\033[s'
+SAVE_POS= ;[ -t 1 ] && SAVE_POS='\033[3D\033[s\033[3C'
+RESTORE_POS= ;[ -t 1 ] && RESTORE_POS='\033[u'
 
 helpSequencer() {
   cat <<USAGE_EOF 
@@ -208,7 +213,14 @@ USAGE_API
 echo -e "${GREEN} echoinfo [...]${NC}"
 cat <<USAGE_API
     echo additional correctly indented line to step info
-      [...] : all parrameter are forwared to echo
+      [...] : all parameter are forwared to echo
+
+USAGE_API
+echo -e "${GREEN} echoinfoArgs [...]${NC}"
+cat <<USAGE_API
+    echo argument description after step number or alias.
+    This must be called first in the step info function.
+      [...] : no parameter are forwared to echo
 
 USAGE_API
 echo -e "${GREEN} endCheckEmpty <VARIABLENAME> [DESCRIPTION]${NC}"
@@ -309,12 +321,22 @@ outColor() {
 # Echo additional line to info correctly indented
 INDENT_HELP='              : '
 INDENTAPPEND_HELP='                '
-INDENTAPPEND_INFO='          '
 echoinfo() { 
   if [ $CONTEXT_HELP -ne 0 ] ; then
     printf '%s' "$INDENTAPPEND_HELP"; echo "$@"
   else
-    printf '%s' "$INDENTAPPEND_INFO"; echo "$@"
+    echo -ne "${RESTORE_POS}"; echo "$@"
+  fi
+}
+
+# Echo info about step arguments
+# Needs to be called first in _info() function
+echoinfoArgs() {
+  echo -e "${RESTORE_POS}$@"
+  if [ $CONTEXT_EXE -ne 0 ]; then
+    echo -ne "${RESTORE_POS}"
+  else
+    printf '%s' "$INDENT_HELP"
   fi
 }
 
@@ -685,10 +707,12 @@ execute() {
   fi 
 
   if [ $QUIET -ne 2 ] ; then
-    echo -en "\n [STEP $1] "
+    echo -en "\n [STEP $1] ${SAVE_POS_EXE}"
     existsFunction step_${1}_info
     if [ $? -eq 0 ] ; then
+      CONTEXT_EXE=1
       step_${1}_info $1 "${STEP_ARGS[@]}"
+      CONTEXT_EXE=0
       outColor
     else
       # Add newline if no info is given
@@ -910,11 +934,15 @@ parseAlias() {
   done
 }
 
-# displayHelp [NO TEMPLATE]
+# displayHelp [NO TEMPLATE] [STEP NUMBER OR ALIAS]
 #    [NO TEMPLATE] 
 #       0 (default)  : Ask for template creation
 #       1            : Do not ask for template creation
-# - Always display sequencer help and, if available, sequence help
+#    [STEP NUMBER OR ALIAS]
+#      [NO TEMPLATE] must be set
+#       Display step info function only for given step
+#
+# - Display sequencer help and, if available, sequence help
 # - Cluster continous (more than 1) steps visually together 
 displayHelp() {
   local i
@@ -923,8 +951,24 @@ displayHelp() {
   local lastClusterSize=0
   local createTemplate=1
   local stepsFound=0
+  local loopStart=0
+  local loopEnd=${MAX_STEP}
   CONTEXT_HELP=1
+
+  # check if help is requested for a single step
+  if [ ! -z "$2" ]; then
+    parseAlias
+    checkStep "$2"
+    loopStart=$?
+  fi
+
+  if [ "$loopStart" == "0" ]; then
     helpSequencer
+    loopStart=1
+  else
+    # Output loop only for one step
+    loopEnd=$loopStart
+  fi
 
   if [ ! -z $1 ] && [ $1 -eq 1 ] ; then
     createTemplate=0
@@ -961,7 +1005,7 @@ displayHelp() {
     exit 1;
   else
     echo -e "\n  Step (= alias) documentation:"
-    for ((i=1; i<=${MAX_STEP}; i++)); do
+    for ((i=$loopStart; i<=$loopEnd; i++)); do
 
       # Display step reference in help if step function exists 
       existsFunction step_${i}
@@ -983,10 +1027,10 @@ displayHelp() {
       existsFunction step_${i}_alias
       if [ $? -eq 0 ] ; then
         step_${i}_alias 
-        echo -e " = ${ORANGE}$ALIAS${NC}" 
+        echo -e " = ${ORANGE}$ALIAS${NC}${SAVE_POS_ALIAS}" 
         printf '%s' "$INDENT_HELP"
       else
-        echo -n " : "
+        echo -en " : ${SAVE_POS}"
       fi
 
       # Display step help only if info function exists
@@ -1095,7 +1139,7 @@ main() {
         SEQUENCER_ARGS+=" $1"
         shift;;
       --help|-h) # show only help
-        displayHelp 1
+        displayHelp 1 "$2"
         exit 0;;
       --helpapi|-ha) #show build-in functions
         helpApi