#!/bin/bash
 
CONFIG_FILE="config"
 
###
# Link dir a to b
##
function link_dir()
{
    # Expand input file
    in=`pwd`/$1
    # Expand output file
    out=${2/#~/$HOME}
 
    # Check if directory exists, if not create it.
    if [ ! -d "$in" ]; then
        echo -e "\t** input is not a directory"
        return;
    fi
 
    # Check if destination is a file
    if [ -f "$out" ]; then
        echo -e "\t*\t$out is a file.  Quitting..."
        return
    fi
 
    # Test if it is a symbolic link, if so remove it
    if [ -d "$out" ]; then
        echo -e "\t*\t$out is a directory. Removing..."
        rm -r "$out"
    fi
 
    echo -e "\t*\tLinking $in -> $out"
    ln -s "$in" "$out"
}
 
###
# Link file a to b
##
function link_file()
{
    # Expand input file
    in=`pwd`/$1
    # Expand output file
    out=${2/#~/$HOME}
    # Get the dirname
    dir=$(dirname $out)
 
    # Check if directory exists, if not create it.
    if [ ! -d "$dir" ]; then
        echo -e "\t*\t$dir does not exists, creating"
        mkdir -p "$dir"
    fi
 
    # Test if it is a file, if so remove it
    if [ -f "$out" ]; then
        echo -e "\t*\t$out file exits.  Removing..."
        unlink "$out"
    fi
    # Test if it is a symbolic link, if so remove it
    if [ -h "$out" ]; then
        echo -e "\t*\t$out symbolic link exits: Removing..."
        unlink "$out"
    fi
 
    echo -e "\t*\tLinking $in -> $out"
    ln -s "$in" "$out"
}
 
##
# This function starts processing the subdirectory
##
function subdirectory_linker()
{
    # enter the directory
    pushd "$1" > /dev/null
 
    # Check if the config file is there
    if [ -r "${CONFIG_FILE}"  ]; then
        echo "Parsing config file"
        for file in $( cat "${CONFIG_FILE}");
        do
            # Split the config line into command, intput, output
            CODE=${file%:*:*}
            TEMP_INPUT=${file#*:}
            INPUT=${TEMP_INPUT%:*}
            FILE=${file#*:*:}
 
            # Check the type of action todo, for now l exists, linking
            case "${CODE}" in
            l)
                echo -e "#\tSetting up file "$INPUT" -> "$FILE
                link_file "$INPUT" "$FILE"
            ;;
            ld)
                echo -e "#\tSetting up dir $INPUT -> $FILE"
                link_dir "$INPUT" "$FILE"
            ;;
            esac
        done
 
    else
        echo "No config file in "$1
    fi
 
    # Leave directory
    popd > /dev/null
}
 
## Iterate through all the directories.
## The idea is every dotfile, or set of dotfiles have it own subdir.
 
# iterate all directories
for a in $(ls -d */);
do
    echo Examining directory: $a
    subdirectory_linker "$a"
done