create-links

#!/bin/bash

do_not_link=("Readme.md" ".gitignore")

here=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )

element_in () {
	local e
	for e in ${@:2} ; do
		[[ "$e" == "$1" ]] && return 0
	done
	return 1
}


link_files () {
	base="$1"
	destination="$2"
	prefix="$3"
	ignore="${@:4}"

	for target in "$base/"[a-zA-Z]* ; do
		basename=$( basename "$target" )
		link="${destination}/${prefix}${basename}"

		if element_in "$basename" "${ignore[@]}" ; then
			# Bail on some files we do not want
			continue
		fi

		if [[ -h "$link" && $( readlink "$link" ) == "$target" ]] ; then
			# Bail if the symlink exists already, and points to the correct place
			continue
		fi

		echo "Linking \`$link' -> \`$target'"

		if [[ -h "$link" ]] ; then
			echo "  Removing existing symbolic link \`$link' -> \`$( readlink -e "$link" )'"
			rm "$link"
		fi

		if [[ -a "$link" ]] ; then
			echo "  \`$link exists. Moving it to \`$link.back"
			mv "$link" "$link.back" || echo "  Couldn't move \`$link' to \`$link.back'!"
		fi

		ln -s "$target" "$link" || echo "  Couldn't link \`$link' to \`$target'"
	done

	unset broken_link
	while IFS= read -r -u3 -d $'\0' broken_link; do
		target=$( readlink "$broken_link" )
		if [[ "$target" == "$base"/* ]] ; then
			echo "Removing dangling symlink \`$broken_link' -> \`$target'"
			rm $broken_link
		fi
	done 3< <( find $destination -maxdepth 1 -type l -xtype l -print0 )
}


# Link ./home/* to ~/.*
link_files "$here/home" "$HOME" "." "${do_not_link[@]}"

# Link ./config/* to ~/.config/*
mkdir -p "$HOME/.config"
link_files "$here/config" "$HOME/.config" '' "${do_not_link[@]}"

# Link ./share/* to ~/.local/share/*
mkdir -p "$HOME/.local/share"
link_files "$here/share" "$HOME/.local/share" '' "${do_not_link[@]}"

mkdir -p "$HOME/.local/bin"
link_files "$here/bin" "$HOME/.local/bin" '' "${do_not_link[@]}"