shellfu-bash-saturnin/src/libexec/saturnin-ln

#!/bin/bash

. $(ffoom path)

ffoo import misc
ffoo import pretty

DEFAULT_TARGET=$HOME
TRY_RELPATH=true
FORCE=false

PY_SCRIPT="
import os.path
import sys
src, dst = sys.argv[1:]
r = os.path.relpath(src, dst)
a = os.path.abspath(src)
if len(a) < len (r):
    print a
else:
    print r
"

usage() {
    usage_is "[-f|--force] [-t|--target TARGET] SOURCE [NAME]"
}

link() {
    local src=$1
    local dst=$2
    debug -v src dst
    if $TRY_RELPATH;
    then
        src=$(python <(echo "$PY_SCRIPT") "$src" "$(dirname $dst)")
    fi
    think "linking $src to $dst"
    rm -f $dst
    ln -s $src $dst
}

load() {
    saturnin conf -p ln.dir.$1 | expand_tilde
}

while true; do case $1 in
    -f|--force)         FORCE=true;         shift   ;;
    -t|--target)        target=$2           shift 2 ;;
    --help)             usage                       ;;
    -*)                 usage                       ;;
    "")                 usage                       ;;
    *)                  src=$1; name=$2;    break   ;;
esac done

test -z "$target"               && target=$(load target)
test -z "$prefix"               && prefix=$(load prefix)
test -z "$target"               && target=$DEFAULT_TARGET

case $prefix.$name in
    .)          die "provide at least name or set prefix in ln.conf";;
    $prefix.)   name=$prefix;;
    .$name)     :;;
    *)          name=$prefix.$name;;
esac

debug -v name target

mkdir -p $target
link $src $target/$name