#!/bin/sh/
################################################################################
# Markutils save and restore the current directorry to perssitent registers
# that are shared across shells.
#
# To install, source this file from your .bashrc or .bash_profile, e.g.
#   source ~/bin/markutils
#
# To use:
#   The following simple aliases are created by this script:
#    sR    sets register R to `pwd`
#    pR    prints the directory in register R
#    gR    cd's to register R's directory
#
# Register names:
#   Registers 0-3,5-9,A-Z are automatically created, giving you the aliases
#    s1,g1,p1 ... s9,g9,p9 etc
#   Register 4 is not created due to conflict with p4(perforce)
#   Customize the REGISTER_NAMES variable below to get
#   additional registers. Notice that register names can be multiple characters
#   long, giving you aliases like:
#    sTS,gTS,pTS
#
# Example:
#   I work on a project that is simply named, "tool". It has two directories:
#     ~/Working/tool/src/
#     ~/Working/tool/include/
#   
#   When I began the project I did the following:
#     trantor@/home/duca/ $  cd ~/Working/tool/src
#     trantor@/home/duca/Working/tool/src/ $ sTS
#     Set sTS to /home/duca/Working/tool/src/
#     trantor@/home/duca/Working/tool/src/ $ cd ../include/
#     trantor@/home/duca/Working/tool/src/ $ sTI
#     Set sTI to /home/duca/Working/tool/include/
#
#   Now when I work on the code, I can move between these two directories using
#   these two aliases. This pays off big time when your directories are much
#   longer and harder to type.
# 
################################################################################
REGISTER_NAMES="0 1 2 3 5 6 7 8 9 A B C CI CL D E F G H I J K L M N O P Q R S SRT T TA TI TS TG T0 T1 T2 T3 U UB US V W X Y Z PC PL J1 J2 J3 J4 J5 JT JTs JTj JS JI JIE JE JH JQ"

################################################################################
# The values of registers are stored in the following folder
# In other words, register X's value would be $(MARK_DIR)/mX
MARK_DIR=~/.markutils

################################################################################
NUM_MARKS=9
if ! test -d $MARK_DIR; then
	mkdir $MARK_DIR
fi

for i in $REGISTER_NAMES; do
	markfile=$MARK_DIR"/m"$i

	acmd="echo Set g"$i" to \`pwd\`; echo \`pwd\` > $markfile"
	cmd="alias s"$i"='"$acmd\'
	eval $cmd

	acmd="cd \`cat $markfile\`"
	cmd="alias g"$i"='"$acmd"'"
	eval $cmd

	acmd="echo \`cat $markfile\`"
	cmd="alias p"$i"='"$acmd"'"
	eval $cmd

	if ! test -e $markfile; then eval s$i; fi
done
unset i
unset cmd
unset acmd
alias resetmarks='rm -rf $MARK_DIR; source ~/bin/markutils'
alias b='cd $OLDPWD'