Launcher improvements

 * Silenced commands that check for asdf / rtx
 * allowed a command line option of 'iex' so you can start iex rather
   than elixir for testing

bin/start_lexical.sh

@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 
 set_up_version_manager() {
-    if [ -e $HOME/.asdf ] &&  asdf which elixir -eq 0; then
+    if [ -e $HOME/.asdf ] &&  asdf which elixir > /dev/null -eq 0; then
         VERSION_MANAGER="asdf"
-    elif [ -e $HOME/.rtx ] && rtx which elixir -eq 0; then
+    elif [ -e $HOME/.rtx ] && rtx which elixir > /dev/null -eq 0; then
         VERSION_MANAGER="rtx"
     else
         VERSION_MANAGER="none"
@@ -25,12 +25,20 @@ case "$VERSION_MANAGER" in
         ;;
 esac
 
+case $1 in
+    iex)
+        ELIXIR_COMMAND=iex
+        ;;
+    *)
+        ELIXIR_COMMAND=elixir
+        ;;
+esac
 
 SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 
 export ERL_LIBS="${SCRIPT_DIR}/../lib"
-elixir -pa "${SCRIPT_DIR}/../consolidated" \
-       -pa "${SCRIPT_DIR}/../config/" \
-       -pa "${SCRIPT_DIR}/../priv/" \
-       --eval "LXical.Server.Boot.start" \
-       --no-halt
+"${ELIXIR_COMMAND}" -pa "${SCRIPT_DIR}/../consolidated" \
+                    -pa "${SCRIPT_DIR}/../config/" \
+                    -pa "${SCRIPT_DIR}/../priv/" \
+                    --eval "LXical.Server.Boot.start" \
+                    --no-halt