common

#!/usr/bin/env bash
export VIMPLUG_HOME=${HOME}/.vim/autoload
export DEV_HOME=${HOME}/dev
export REPO_PATH="$(git rev-parse --show-toplevel)"
export MY_BIN=${HOME}/.bin

function echo-err { echo "$@" 1>&2; }

function exists-in-path {
    if [[ ! -z $1 ]]; then
        type -p $1 > /dev/null 2>&1
        return $?
    else
        return 1
    fi
}

function symlink-src-to-target {
    SRC=$1
    TARGET=$2
    if [ $# != 2 ]; then
        echo-err "Usage: $0 [src] [target]"
        return 1
    fi
    # only link files or directories rather than linking other symlinks
    if [[ -f $SRC || -d $SRC ]]; then
        # is target already a symlink that points to the expected?
        if [[ -L $TARGET && "$(readlink $TARGET)" == "$SRC" ]]; then :
        else
            # check if target exists, if it exists, then make a backup (rather than deleting)
            [[ -e $TARGET ]] && mv "$TARGET" "$(dirname $TARGET)/$(basename $TARGET).$(date +%s).bak"
            [[ -L $TARGET ]] || ln -s "$SRC" "$TARGET"
        fi
        return 0
    else
        echo-err "$SRC is not a file or a directory"
        return 1
    fi
}