nux.repl: Improved autocompletion feature

Added:
 - autocompletion automaticly proposes tasks
 - autocompletion for debug, trace, help tasks
 - extension points for custom task specific autocompleters.

inc/nux-runner.inc.sh

@@ -51,3 +51,104 @@ function nuxr.help.task.comment {
     return -1
   fi
 }
+
+##
+## nuxr.interactive::
+##   Runs an interactive taskie shell with base taskie commands available.
+##
+nuxr.task.interactive() {
+  nux.use nux.repl
+  .process() {
+    backendFunc=task.$command;
+    if nux.check.function $backendFunc; then
+
+      eval nuxr.run "$command" "$arguments"
+    else
+      echo "$command" is not defined.
+    fi
+  }
+
+  .prompt() {
+    echo "${nc_green}$NUX_APPNAME${nc_end}> "
+  }
+  nux.repl.start .process .prompt nuxr.repl.completer
+}
+
+nuxr.tasks.runtime.search() {
+  set | grep -G "^task\.$1.* ()" \
+  | cut -d "." -f2- \
+  | cut -d"(" -f1
+}
+
+nuxr.repl.completer.help() {
+    nux.log debug "Help completer"
+    nux.log debug "current_pos $current_pos"
+    nux.log debug "current word $current_word"
+    if [ $current_pos -eq 2 ]; then
+      nuxr.tasks.runtime.search $current_word | grep -v "help."
+      nuxr.tasks.runtime.search help.$current_word | cut -d"." -f2
+    fi
+}
+
+nuxr.repl.completer._prefix_task() {
+  nux.log debug "Prefix completer. $current_pos $current_word"
+  if [ $current_pos -eq 2 ]; then
+    nuxr.tasks.runtime.search $current_word
+  else
+    nuxr.repl.completer "${line#$command }"
+  fi
+}
+
+nuxr.repl.completer() {
+  local line=$1;
+  nux.log debug "Requested completion for " "'$line'"
+
+  local words=($line)
+  local current_pos=${#words[@]};
+  if [ "$current_pos" -eq 0 ]; then
+    nuxr.tasks.runtime.search | sort | uniq
+    return
+  fi
+
+  local current_word=${words[${#words[@]}-1]};
+  if [ "$line" != "${line%% }" ] ; then
+    nux.log debug "Creating proposal for next word."
+    let current_pos=current_pos+1
+    current_word=""
+  fi
+  local result="";
+  if [ $current_pos -eq 1 ] ; then
+    result=$(nuxr.tasks.runtime.search $current_word)
+  elif [ $current_pos -ge 2 ]; then
+    command=${words[0]}
+    nux.log debug "Trying to use completer for '$command'"
+    case $command in
+      debug) ;&
+      trace)
+        result=$(nuxr.repl.completer._prefix_task)
+        ;;
+      *)
+        result=$(nux.exec.optional nuxr.repl.completer.$command)
+        ;;
+    esac;
+  fi
+
+  if [ -n "$result" ]; then
+    nux.log debug "Completion found."
+    echo $result
+  else
+    nux.log debug "No completion found."
+    printf '\a' >> $(tty)
+    if [ $current_pos -gt 1 ]; then
+      echo $current_word
+    fi
+  fi
+}
+
+nux.app() {
+  echo $NUX_APPNAME
+}
+
+nux.app.dir() {
+    :
+}

inc/nux.repl.inc.sh

@@ -76,6 +76,7 @@ function nux.repl.completion() {
   complete_command=$(complete -p | grep " ${program_name}$")
 
   COMPREPLY=()
+
   COMPREPLY=($($compgen_command "$completion_line"))
 
   # get commmon prefix of available completions