Add contrib/depdot.sh

This script will analyze the dependencies of Gluon's packages and output
them as a dot graph.

contrib/depdot.sh

+#!/bin/bash
+
+# Script to output the dependency graph of Gluon's packages
+# Limitations:
+#  * Works only if directory names and package names are the same (true for all Gluon packages)
+#  * Doesn't show dependencies through virtual packages correctly
+
+
+
+shopt -s nullglob
+
+
+pushd "$(dirname "$0")/.." >/dev/null
+
+
+escape_name() {
+	echo -n "_$1" | tr -c '[:alnum:]' _
+}
+
+print_node () {
+	echo "$(escape_name "$1") [label=\"$1\", shape=box];"
+}
+
+print_dep() {
+	echo "$(escape_name "$1") -> $(escape_name "$2");"
+}
+
+echo 'digraph G {'
+
+for makefile in ./package/*/Makefile; do
+	dir="$(dirname "$makefile")"
+	package="$(basename "$dir")"
+
+	deps=$(grep -w DEPENDS "$makefile" | cut -d= -f2 | tr -d +)
+
+	print_node "$package"
+	for dep in $deps; do
+		print_node "$dep"
+		print_dep "$package" "$dep"
+	done
+done | sort -u
+
+popd >/dev/null
+
+echo '}'