Correctly resolve aliases in help command.

This resolves issue #1.

libexec/tmuxifier-alias

@@ -31,6 +31,5 @@ case "$1" in
     echo "list-windows"
     ;;
   * )
-    echo "unknown alias \"$1\""
     exit 1
 esac

libexec/tmuxifier-help

@@ -10,13 +10,11 @@ fi
 
 command="$1"
 
-# Lookup command, attempt to resolve as alias if fails
-! command_path="$(command -v "tmuxifier-$command")"
-if [ -z "$command_path" ]; then
-  resolved="$(tmuxifier-alias "$command")"
-  if [ ! -z "$resolved" ]; then
+# Ensure we have the correct command name in case an alias was given.
+if [ -n "$command" ]; then
+  ! resolved="$(tmuxifier-alias "$command")"
+  if [ -n "$resolved" ]; then
     command="$resolved"
-    ! command_path="$(command -v "tmuxifier-$command")"
   fi
 fi
 
@@ -111,14 +109,16 @@ Aliases: list-win, lsw
 List all window layouts."
     ;;
   * )
-    if [ ! -z "$command_path" ]; then
+    ! command_path="$(tmuxifier-resolve-command-path "$command")"
+    if [ -n "$command_path" ]; then
       echo "Sorry, the '$command' command isn't documented yet."
       echo
       echo "You can view the command's source here:"
       echo "$command_path"
       echo
     else
-      echo "tmuxifier: no such command '$command'"
+      echo "tmuxifier: no such command '$command'" >&2
+      exit 1
     fi
     ;;
 esac

libexec/tmuxifier-resolve-command-path

@@ -0,0 +1,19 @@
+#! /usr/bin/env bash
+set -e
+[ -n "$TMUXIFIER_DEBUG" ] && set -x
+
+if [ -n "$1" ]; then
+  ! command_path="$(command -v "tmuxifier-$1")"
+  if [ -z "$command_path" ]; then
+    resolved="$(tmuxifier-alias "$1")"
+    if [ -n "$resolved" ]; then
+      ! command_path="$(command -v "tmuxifier-$resolved")"
+    fi
+  fi
+fi
+
+if [ -n "$command_path" ]; then
+  echo "$command_path"
+else
+  exit 1
+fi