Add script to generate concept maps using Graphviz

concept-map.sh

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+SIMPLE_DOT=$(cat <<'EOF'
+BEGIN {
+	edge = "->"
+	properties_separator = ";"
+	open_blocks = "{"
+	close_blocks = "}"
+	hyperedge_property = "_he"
+	uuid_command = "uuidgen"
+
+	blocks = 0
+	processed_line = 0
+
+	# Print the graph header.
+	#print "digraph {"
+}
+
+# Firstly, we process blocks.
+NF == 1 && $1 == open_blocks {
+	# open block
+	blocks++
+}
+
+NF == 1 && $1 == "}" {
+	# close block
+	blocks--
+}
+
+# Secondly, we process "special rules".
+## Nodes.
+NF > 1 && $2 != edge {
+	printf ($1 "\t")
+	label = get_label($0)
+	get_properties($0, properties)
+	properties_str = generate_properties(label, properties)
+	if (length(properties_str)) {
+		print properties_str
+	}
+	
+	processed_line = 1
+}
+
+## Edges.
+NF > 3 && $2 == edge {
+	printf ($1 FS $2 FS $3)
+	label = get_label($0)
+	get_properties($0, properties)
+	properties_str = generate_properties(label, properties)
+	if (length(properties_str)) {
+		printf "\t"
+		print properties_str
+	}
+
+	processed_line = 1
+}
+
+# Thirdly, we do general treatment for every line.
+{
+	if (!processed_line) {
+		print $0
+	}
+	processed_line = 0
+}
+
+END {
+	# Print the closing curly brace.
+	print "}"
+}
+
+function get_label(_line, _field, _out, _split, _len) {
+	_field = 2
+	if ($2 == edge) {
+		_field = 4	
+	}
+
+	# Special case: there isn't label, but there are properties.
+	_len = split($(_field), _split, properties_separator)
+	if ((_len > 1) && !_split[1]) {
+		# There is a properties_separator in the field, and no label.
+		return
+	}
+
+	for (_field; _field <= NF; _field++) {
+		_len = split($(_field), _split, properties_separator)
+		if (_len > 1) {
+			_out = !(_out) ? _split[1] : (_out FS _split[1])
+			return _out
+		} else {
+			_out = !(_out) ? $(_field) : (_out FS $(_field))
+		}
+	}
+	return _out
+}
+
+function get_properties(_line, _split, _field, _len, _uuid) {
+	delete _split
+	_len = split(_line, _split, properties_separator)
+	if (!_len) {
+		return
+	}
+
+	for (_field = 2; _field <= _len; _field++) {
+		if (_split[_field] == hyperedge_property) {
+			uuid_command | getline _uuid
+			_split[_field] = hyperedge_property "=\"" _uuid "\""
+			close(uuid_command)
+		}
+		_split[_field - 1] = _split[_field]
+	}
+	delete _split[_len]
+	return
+}
+
+function generate_properties(_label, _properties, _out, _len, _type_label) {
+	_type_label = "label"
+	for (p in _properties) {
+		if (match(hyperedge_property, _properties[p])) {
+			_type_label = "xlabel"
+		}
+	}
+	if (_label) {
+		_out = (_type_label "=\"" _label "\"")
+	}
+
+	_len = length(_properties)
+	for (i = 1; i <= _len; i++) {
+		_out = !(_out) ? _properties[1] : (_out "," _properties[i])
+	}
+
+	return (!(_out) ? "" : ("[" _out "]"))
+}
+EOF
+)
+
+HYPERGRAPH_PROCESSOR=$(cat <<'EOF'
+// An attempt to reproduce what was reported in https://gitlab.com/graphviz/graphviz/-/issues/1911#note_473279838
+
+E [ _he ] {
+	// Creates the node representing the hyper-edge, if it already doesn't exist.
+	node_t hyperedge = isNode($G, $._he);
+	if (!hyperedge) {
+		hyperedge = node($G, $._he);
+		hyperedge.shape = "point";
+		hyperedge.fillcolor = "red";
+		if ($.label) {
+			/*
+			hyperedge.label = $.label;
+			hyperedge.shape = "none";
+			*/
+			hyperedge.xlabel = $.label;
+		}
+	}
+
+	// Creates the edges to and from hyperedge, if it already doesn't exist.
+	if (!isEdge_sg($G, $.tail, hyperedge, "")) {
+		edge_t new_out = edge_sg($G, $.tail, hyperedge, "");
+		new_out.arrowhead = "none";
+	}
+	if(!isEdge_sg($G, hyperedge, $.head, "")) {
+		edge_t new_in = edge_sg($G, hyperedge, $.head, "");
+	}
+
+	// Removes the current edge (with attribute "_he") because edges to "hyperedge" are added.
+	delete($G, $);
+}
+EOF
+)
+
+# Process the input files and produce a SVG.
+cat <(echo "digraph {") ~/src/scripts/concept-style.dot <(awk -f <(echo "${SIMPLE_DOT}") $*) |
+gvpr -c -f <(echo "${HYPERGRAPH_PROCESSOR}") |
+dot -Tsvg
+
+## DEAD-CODE
+## awk -f ~/tmp/graphviz/concept.awk $* |
+## gvpr -c -f ~/tmp/graphviz/hypergraph.gvpr |
+## xsel -ib
+

concept-style.dot

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+// Style taken, and modified, from https://mostlymaths.net/2023/07/concept-maps-helper.html/ 
+layout=dot
+margin=1
+bgcolor="#ffffff00"
+rankdir=TB
+fontname="Sans-Serif"
+nodesep=0.5
+overlap=scale
+compound=true
+node [
+	fontname = "Sans-Serif"
+	style="rounded,filled"
+	labelloc=c
+	margin="0.3,0.15"
+	splines=true
+	shape=rect
+	fontsize=15
+];
+edge [
+	minlen=3
+	penwidth=2
+	color="#33333388"
+	fontname="Sans-Serif"
+	fontsize=14
+	arrowhead=normal // Latest papers about cmaps have recovered heads
+];
+graph [
+	//margin=8
+	style="rounded,dotted"
+];
+fontsize=24
+labelloc="t"