Sequencer - determine system text editor and ask before seq configuration creation

sequencer/sequencer.sh

@@ -25,6 +25,8 @@ MAX_STEP=512
 ALIAS=
 CONTEXT_HELP=0
 CONTEXT_EXE=0
+SEQ_NAME="$_SQN_ALIAS"
+[ -z "$SEQ_NAME" ] && SEQ_NAME="${0##*/}"
 SEQ_CONFIG_EDIT=0
 SEQ_CONFIG_NAME=".seqs"
 SEQ_CONFIG_FILE=
@@ -35,6 +37,7 @@ SEQ_PROFILE_LIST=0
 TEMPLATE_NAME=seqTemplateExample.sh
 MISSING_CONF=missingConf.log
 VERSION_STRING="${VERSION_REV}.${VERSION_MAJOR}.${VERSION_MINOR}"
+DEFAULT_EDITOR_SYSTEM=
 
 BBLACK= ; [ -t 1 ] && BBLACK='\033[40m'
 BLACK= ; [ -t 1 ] && BLACK='\033[0;30m' 
@@ -59,11 +62,10 @@ 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() {
-  local scriptName=${0##*/}
-  [ ! -z "$_SQN_ALIAS" ] && scriptName="$_SQN_ALIAS"
   cat <<USAGE_EOF 
-Usage: $scriptName [OPTIONS] [STEP NUMBER(s) or ALIAS] [STEP ARGUMENTS]
+Usage: $SEQ_NAME [OPTIONS] [STEP NUMBER(s) or ALIAS] [STEP ARGUMENTS]
 
  [OPTIONS]
   --all, -a         : Run all steps regardless of continuity
@@ -503,6 +505,7 @@ listProfiles() {
 #      3       : No configuration created
 initSeqConfig() {
   local arg
+  local answer
   local sourceAlways=0
   local createEmpty=0
   local seqProfiles=0
@@ -541,12 +544,25 @@ initSeqConfig() {
   SEQ_CONFIG_HOME="$configDir"
 
   if [ -s "$configLoc" ] ; then
-    [ $QUIET -ne 2 ] && echo " [I] Using configuration file: $configLoc"
+    echoseq " [I] Using configuration file: $configLoc"
     SEQ_CONFIG_FILE="$configLoc"
     . "$configLoc"
     return 0
   fi
 
+  # Ask for config creation if not existent
+  if [ $QUIET -eq 0 ] && [ $DRY -eq 0 ]; then
+    echo " [I] Configuration $configLoc missing"
+    read -p "Create it now? y/[n]? " answer
+    case $answer in
+      [yY])
+        ;;
+      *)
+        return 3
+        ;;
+    esac
+  fi
+
   # Config does not exist, check for template
   if [ -s "$configTemplate" ] ; then
     
@@ -558,6 +574,7 @@ initSeqConfig() {
 
       echoerr " [I] Using existing configuration: $configExists"
       echoerr "     (Moved to $configDir)"
+      SEQ_CONFIG_FILE="$configLoc"
       . "$configLoc"
       return 0
     fi
@@ -1159,6 +1176,12 @@ exep() {
   fi
 }
 
+# Used as editor if no system editor could be found
+no_editor_found() {
+  echoerr " [E] No editor found (\$EDITOR,\"/etc/alternatives\",nano,vi)"
+  echoerr "     Cannot open: $*"
+}
+
 main() {
   local arg
   local START=0
@@ -1259,17 +1282,32 @@ main() {
     read -p "Press enter to continue or Ctrl + C to abort"
   fi
 
+  # Determine system default editor
+  DEFAULT_EDITOR_SYSTEM="$(realpath -eq "/etc/alternatives/editor")"
+  ## Various fallbacks
+  [ -z "$DEFAULT_EDITOR_SYSTEM" ] && DEFAULT_EDITOR_SYSTEM="$EDITOR"
+  [ -z "$DEFAULT_EDITOR_SYSTEM" ] && DEFAULT_EDITOR_SYSTEM="$(command -v nano)"
+  [ -z "$DEFAULT_EDITOR_SYSTEM" ] && DEFAULT_EDITOR_SYSTEM="$(command -v vi)"
+  ## Fall back to error message
+  [ -z "$DEFAULT_EDITOR_SYSTEM" ] && DEFAULT_EDITOR_SYSTEM="no_editor_found"
+
   parseAlias
 
   # run configuration for sequence only if available and if first step is valid
   existsFunction step_config
   if [ $? -eq 0 ] ; then
+
+    # Create/edit configuration file
     if [ $SEQ_CONFIG_EDIT -ne 0 ] ; then
       step_config "${STEP_ARGS[@]}"
-      [ -w "$SEQ_CONFIG_FILE" ] && vi "$SEQ_CONFIG_FILE" \
+      if [ -w "$SEQ_CONFIG_FILE" ]; then
-        || echoerr " [E] No configuration file available"
+        "$DEFAULT_EDITOR_SYSTEM" "$SEQ_CONFIG_FILE"
+      else
+        echoerr " [E] No configuration file available"
+      fi
       exit 0
     fi
+
     checkStep "${START[0]}"
     if [ $? -ne 0 ] ; then
       step_config "${STEP_ARGS[@]}"