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#!/bin/sh
# link tree
lt_version='lt-0.1'
unset CDPATH
export LC_ALL=C IFS='
'
# ca returns the common ancestor between 2 paths
# ca /h/u/a/b /h/u/c/d => /h/u
ca() {
ca_p1=${1#/} ca_p2=${2#/} ca_r1= ca_r2= R1=/
while true; do
[ "$ca_p1" ] || [ "$ca_p2" ] || break
ca_r1=$ca_r1/${ca_p1%%/*} ca_p1=${ca_p1#*/}
ca_r2=$ca_r2/${ca_p2%%/*} ca_p2=${ca_p2#*/}
[ "$ca_r1" != "$ca_r2" ] && break
R1=$ca_r1
done
}
#echo ca $1 $2 && ca $1 $2 && echo "$R1"
# bp returns the relative path from source to base
bp() {
bp_s=$1 bp_b=$2 R1=
while true; do
[ "$bp_b" = "$bp_s" ] && break
bp_s=${bp_s%/*}
[ "$R1" ] && R1=$R1/.. || R1=..
done
}
#echo bp /h/u/a /h/u && bp /h/u/a /h/u && echo "$R1"
# rp returns the relative path between src and base
# rp /h/u/a/b/f /h/u/b/f [/h/u] ../a/b/f
rp() {
rp_s=$1 rp_d=$2 rp_c=$3
! [ "$rp_c" ] && ca "$1" "$2" && rp_c=$R1
rp_bd=${rp_d#$rp_c/}
rp_bs=${rp_s#$rp_c/}
bp "$rp_d" "$rp_c" && R1=$R1/$rp_bs && R1=${R1#../}
}
#rp /h/u/a/b /h/u/b && echo $R1
skip=".git .gitignore .*.swp Makefile"
# link tree src dest
lt() {
d=$(mkdir -p "$2" && cd "$2" && pwd)
cd "$1" && s=$PWD
find . ! -type d -print | {
cd "$d"
while read f; do
for k in $skip; do
case $f in (./$k|./$k/*) continue 2;; esac
done
f=${f#./}
fd=$d/$f; fd=${fd%/*}
test -d "$fd" || $trace mkdir -p "$fd"
rp "$s/$f" "$d/$f" && $trace ln -sf "$R1" "$d/$f"
done
}
}
#trace=echo
lt "$1" "$2"
#echo $1 $2 $3 && $1 $2 $3 && echo $R1
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