Overhaul the installation and detection mechanisms

startup_hooks/tcshrc

@@ -1,14 +1,33 @@
 # This file will always be taken in.  .login is now
 # vestigial, and doesn't matter if first or second.
 
-# These are the bits that would be in login:
-
+# Reset the CSHENV_DIR
+# (TODO: Downgrade this from environment variable to shell variable)
+unsetenv CSHENV_DIR
 if( ! $?CSHENV_DIR ) then
-    setenv CSHENV_DIR ~/cshenv
+	if( $?CSHENV_DEBUG ) then
+		echo "CSHENV_DIR is not set.  Guessing it based upon "'${1}'": ${1}"
+	endif
+	# Done twice to strip out the hooks dir and the hook itself.
+	setenv CSHENV_DIR ${1}_
+	setenv CSHENV_DIR `dirname ${CSHENV_DIR}`
+	setenv CSHENV_DIR `dirname ${CSHENV_DIR}`
+	if( $?CSHENV_DEBUG ) then
+		echo "CSHENV_DIR is auto set to ${CSHENV_DIR}"
+	endif
+
+	if( "." == $#CSHENV_DIR ) then
+		if( $?CSHENV_DEBUG ) then
+			echo "CSHENV_DIR is still not set.  Using guessed default."
+		endif
+
+		set cshenv_fallback_dir
+		setenv CSHENV_DIR ~/cshenv
+	endif
 endif
 
 if( $?CSHENV_DEBUG ) then
-    echo "Set CSHENV_DIR to: " ${CSHENV_DIR}
+    echo "Set (in tcshrc hook) CSHENV_DIR to: " ${CSHENV_DIR}
 endif
 
 setenv LC_NUMERIC en_US.UTF-8
@@ -25,16 +44,6 @@ if( $?CSHENV_DEBUG ) then
     echo "Starting tcshrc..."
 endif
 
-#if( -z ${_} ) then
-    #echo $0
-    #setenv CSHENV_TCSHRC_PATH $0
-#else
-    #echo ${_}
-    #setenv CSHENV_TCSHRC_PATH "${_}"
-#endif
-
-#echo tcshrc hook lives at: ${CSHENV_TCSHRC_PATH}
-
 if( -c `tty` ) then
     if( $?CSHENV_DEBUG ) then
         echo "Going to source core tcshrc..."