diff options
Diffstat (limited to 'bin')
| -rwxr-xr-x | bin/lt | 65 |
1 files changed, 42 insertions, 23 deletions
@@ -7,10 +7,21 @@ unset CDPATH export LC_ALL=C IFS=' ' +help() { + echo "Lt is a tool for creating link trees. + +Usage: + lt [-Vn] src dest + +Options: + -V print version and exit + -n print actions but not execute" +} + # ca returns the common ancestor between 2 paths -# ca /h/u/a/b /h/u/c/d => /h/u +# i.e. ca /h/u/a/b /h/u/c/d => /h/u ca() { - ca_p1=${1#/} ca_p2=${2#/} ca_r1= ca_r2= R1=/ + 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#*/} @@ -20,53 +31,61 @@ ca() { 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= +# pp returns the relative path from child to parent +# i.e. pp /h/u/a /h/u => .. +pp() { + pp_s=$1 pp_b=$2 R1='' while true; do - [ "$bp_b" = "$bp_s" ] && break - bp_s=${bp_s%/*} + [ "$pp_b" = "$pp_s" ] && break + pp_s=${pp_s%/*} [ "$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 +# i.e. 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=${R1#../} + pp "$rp_d" "$rp_c" && R1=$R1/$rp_bs && R1=${R1#../} } -#rp /h/u/a/b /h/u/b && echo $R1 - skip=".git .gitignore .*.swp Makefile README.md" -# link tree src dest +# lt links src tree to dest (each file is a link) lt() { d=$(mkdir -p "$2" && cd "$2" && pwd) - cd "$1" && s=$PWD + cd "$1" && s=$PWD && find . ! -type d -print | { - cd "$d" - while read f; do + cd "$d" && + while read -r f; do for k in $skip; do case $f in (./$k|./$k/*) continue 2;; esac done - f=${f#./} - fd=$d/$f; fd=${fd%/*} + f=${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 +while getopts :nvV opt; do + case $opt in + (n) trace='echo' ;; + (V) echo "$lt_version"; exit ;; + (*) help; exit 1;; + esac +done +shift $((OPTIND -1)) + lt "$1" "$2" #echo $1 $2 $3 && $1 $2 $3 && echo $R1 + +# Shell coding style: +# - standard POSIX shell, to be used as-is on Unix, Linux (busybox), *BSD* +# - no bashism, GNUism, etc. +# - local variables in same process are prefixed with function name, to avoid collisions +# - same process functions return values in R1, R2, ... global vars. +# - self-documented, self-tested |