diff --git a/graphviz/test.cpp b/graphviz/test.cpp
new file mode 100644
index 00000000..a45bc82a
--- /dev/null
+++ b/graphviz/test.cpp
@@ -0,0 +1,70 @@
+//clang++ -std=c++11 test.cpp && ./a.out && dot test.dot -Tpdf -otest.pdf && open test.pdf
+
+#include <iostream>
+#include <fstream>
+#include <regex>
+#include <unordered_set>
+#include <map>
+#include <vector>
+
+using namespace std;
+
+typedef struct{
+	vector<string> inputs;
+	vector<string> outputs;
+}comp_t;
+
+int main(){
+	map<string,comp_t> comps;
+	vector<string> links;
+	ifstream halfile("test.hal", fstream::in);
+	ofstream dotfile("test.dot", fstream::out);
+	string s((std::istreambuf_iterator<char>(halfile)), std::istreambuf_iterator<char>());
+	smatch m;
+	//m[]     1      2         3      4        5
+	regex  e("(\\w+).(\\w+) <= (\\w+).(\\w+) = (.+)");
+	while(std::regex_search (s,m,e)){
+		//if not connected to itself
+		if(m[1].str() != m[3].str() && m[2].str() != m[4].str()){
+			comps[m[3].str()].outputs.push_back(m[4].str());
+			comps[m[1].str()].inputs.push_back(m[2].str());
+			string link;
+			link.append(m[3].str());
+			link.append(":");
+			link.append(m[4].str());
+			link.append(" -> ");
+			link.append(m[1].str());
+			link.append(":");
+			link.append(m[2].str());
+			link.append("[label=\"");
+			link.append(m[5].str());
+			link.append("\"];");
+			links.push_back(link);
+		}
+		s = m.suffix().str();
+	}
+	
+	dotfile << "digraph G {" << endl;
+	dotfile << "graph [rankdir = LR];" << endl;
+	dotfile << "node[shape=record];" << endl;
+	
+	for(auto &comp:comps){
+		dotfile << comp.first << "[label=\"{{";
+		
+		for(auto &input:comp.second.inputs){
+			dotfile << "<" << input << ">" << input << "|";
+		}
+		dotfile << "}|" << comp.first << "|{";
+		for(auto &output:comp.second.outputs){
+			dotfile << "<" << output << ">" << output << "|";
+		}
+		dotfile << "}}\"];" << endl;
+	}
+	
+	for(auto &link:links){
+		dotfile << link << endl;
+	}
+
+	dotfile << "}" << endl;
+	return 0;
+}
\ No newline at end of file
diff --git a/graphviz/test.hal b/graphviz/test.hal
new file mode 100644
index 00000000..427ab481
--- /dev/null
+++ b/graphviz/test.hal
@@ -0,0 +1,158 @@
+frt0.trg0 <= frt0.trg0 = 0.000000
+frt0.trg1 <= frt0.trg1 = 0.000000
+frt0.trg2 <= frt0.trg2 = 0.000000
+frt0.trg3 <= frt0.trg3 = 0.000000
+frt0.trg4 <= frt0.trg4 = 0.000000
+frt0.trg5 <= frt0.trg5 = 0.000000
+frt0.trg6 <= frt0.trg6 = 0.000000
+frt0.trg7 <= frt0.trg7 = 0.000000
+rt0.trg0 <= rt0.trg0 = 0.000000
+rt0.trg1 <= rt0.trg1 = 0.000000
+rt0.trg2 <= rt0.trg2 = 0.000000
+rt0.trg3 <= rt0.trg3 = 0.000000
+rt0.trg4 <= rt0.trg4 = 0.000000
+rt0.trg5 <= rt0.trg5 = 0.000000
+rt0.trg6 <= rt0.trg6 = 0.000000
+rt0.trg7 <= rt0.trg7 = 0.000000
+nrt0.trg0 <= nrt0.trg0 = 0.000000
+nrt0.trg1 <= nrt0.trg1 = 0.000000
+nrt0.trg2 <= nrt0.trg2 = 0.000000
+nrt0.trg3 <= nrt0.trg3 = 0.000000
+nrt0.trg4 <= nrt0.trg4 = 0.000000
+nrt0.trg5 <= nrt0.trg5 = 0.000000
+nrt0.trg6 <= nrt0.trg6 = 0.000000
+nrt0.trg7 <= nrt0.trg7 = 0.000000
+pos_minus0.in0 <= net0.cmd = 2.913000
+pos_minus0.in1 <= net0.fb = 2.837864
+pos_minus0.out <= pos_minus0.out = 0.071120
+p2uvw0.pwm <= cauto0.pwm_out = -0.728940
+p2uvw0.magpos <= cauto0.mag_pos_out = -2.942175
+p2uvw0.volt <= p2uvw0.volt = 130.000000
+p2uvw0.poles <= p2uvw0.poles = 1.000000
+p2uvw0.pwm_max <= p2uvw0.pwm_max = 0.900000
+p2uvw0.u <= p2uvw0.u = 38.788984
+p2uvw0.v <= p2uvw0.v = 119.271400
+p2uvw0.w <= p2uvw0.w = 56.419876
+p2uvw0.abpwm <= p2uvw0.abpwm = 0.000000
+pwm2uart0.u <= p2uvw0.u = 15.521914
+pwm2uart0.v <= p2uvw0.v = 92.122800
+pwm2uart0.w <= p2uvw0.w = 101.321298
+pwm2uart0.uout <= pwm2uart0.uout = 0.000000
+pwm2uart0.vout <= pwm2uart0.vout = 0.000000
+pwm2uart0.wout <= pwm2uart0.wout = 0.000000
+pwm2uart0.enable <= pwm2uart0.enable = 0.900000
+pwm2uart0.volt <= pwm2uart0.volt = 130.000000
+pwm2uart0.pwm_max <= pwm2uart0.pwm_max = 0.900000
+enc0.res0 <= enc0.res0 = 4096.000007
+enc0.pos0 <= enc0.pos0 = 1.047708
+enc0.reverse0 <= enc0.reverse0 = 0.000000
+enc0.res1 <= enc0.res1 = 4096.000007
+enc0.pos1 <= enc0.pos1 = 2.643049
+enc0.reverse1 <= enc0.reverse1 = 0.000000
+res0.pos <= res0.pos = 0.847776
+res0.amp <= res0.amp = 47330376.477777
+res0.s <= res0.s = -6728.941807
+res0.c <= res0.c = -6223.797887
+res0.reverse <= res0.reverse = 0.000000
+res0.enable <= res0.enable = 1.000000
+res0.error <= res0.error = 0.000000
+pid0.pos_error <= pos_minus0.out = 0.500155
+pid0.vel_cmd <= pid0.vel_cmd = -26.488356
+pid0.vel_ext_cmd <= net0.cmd_d = -43.214280
+pid0.vel_fb <= net0.fb_d = -38.350004
+pid0.vel_error <= pid0.vel_error = 11.491072
+pid0.acc_cmd <= pid0.acc_cmd = 18.848602
+pid0.acc_ext_cmd <= pid0.acc_ext_cmd = 0.000000
+pid0.force_cmd <= pid0.force_cmd = 0.956919
+pid0.force_ext_cmd <= pid0.force_ext_cmd = 0.000000
+pid0.cur_cmd <= pid0.cur_cmd = 0.866322
+pid0.cur_ext_cmd <= pid0.cur_ext_cmd = 0.000000
+pid0.cur_fb <= pid0.cur_fb = 0.000000
+pid0.cur_error <= pid0.cur_error = 0.776179
+pid0.volt_cmd <= pid0.volt_cmd = -65.166112
+pid0.pwm_cmd <= pid0.pwm_cmd = -0.900000
+pid0.enable <= cauto0.ready = 1.000000
+pid0.pos_en <= pid0.pos_en = 1.000000
+pid0.pos_p <= pid0.pos_p = 35.000000
+pid0.pos_lp <= pid0.pos_lp = 1.000000
+pid0.vel_en <= pid0.vel_en = 1.000000
+pid0.vel_p <= pid0.vel_p = 1.000000
+pid0.vel_i <= pid0.vel_i = 50.000000
+pid0.vel_d <= pid0.vel_d = 0.000000
+pid0.vel_ff <= pid0.vel_ff = 1.000000
+pid0.vel_lp <= pid0.vel_lp = 1.000000
+pid0.acc_en <= pid0.acc_en = 1.000000
+pid0.acc_p <= pid0.acc_p = 0.100000
+pid0.acc_ff <= pid0.acc_ff = 0.000000
+pid0.force_en <= pid0.force_en = 1.000000
+pid0.force_p <= pid0.force_p = 1.000000
+pid0.cur_p <= pid0.cur_p = 0.000000
+pid0.cur_ff <= pid0.cur_ff = 28.000000
+pid0.cur_d <= pid0.cur_d = 0.000000
+pid0.cur_ind <= pid0.cur_ind = 2.340000
+pid0.cur_lp <= pid0.cur_lp = 1.000000
+pid0.volt <= pid0.volt = 30.000000
+pid0.vel_max <= pid0.vel_max = 1361.356968
+pid0.vel_e_max <= pid0.vel_e_max = 1.250000
+pid0.acc_max <= pid0.acc_max = 272271.402777
+pid0.force_max <= pid0.force_max = 100.000000
+pid0.cur_max <= pid0.cur_max = 6.000000
+pid0.volt_max <= pid0.volt_max = 130.000000
+pid0.pwm_max <= pid0.pwm_max = 0.900000
+pid0.saturated <= pid0.saturated = 0.000000
+term0.wave0 <= net0.cmd = -2.536000
+term0.gain0 <= term0.gain0 = 10.000000
+term0.offset0 <= term0.offset0 = 0.000000
+term0.wave1 <= net0.fb = -3.133922
+term0.gain1 <= term0.gain1 = 10.000000
+term0.offset1 <= term0.offset1 = 0.000000
+term0.wave2 <= net0.cmd_d = -17.192756
+term0.gain2 <= term0.gain2 = 1.000000
+term0.offset2 <= term0.offset2 = 0.000000
+term0.wave3 <= net0.fb_d = -7.699728
+term0.gain3 <= term0.gain3 = 1.000000
+term0.offset3 <= term0.offset3 = 0.000000
+sim0.amp <= sim0.amp = 3.000000
+sim0.freq <= sim0.freq = 15.000000
+sim0.sin <= sim0.sin = -2.969000
+sim0.cos <= sim0.cos = -0.338999
+sim0.square <= sim0.square = -3.000000
+sim0.vel <= sim0.vel = -1.624185
+sim0.res <= sim0.res = 2000.000000
+pderiv0.in <= net0.cmd = -2.999500
+pderiv0.in_lp <= pderiv0.in_lp = 1.000000
+pderiv0.out <= pderiv0.out = 2.962924
+pderiv0.out_lp <= pderiv0.out_lp = 0.500000
+pderiv0.vel_max <= pderiv0.vel_max = 1361.356968
+pderiv0.acc_max <= pderiv0.acc_max = 272271.402777
+pderiv0.res <= pderiv0.res = 100000.000077
+pderiv1.in <= net0.fb = -2.925301
+pderiv1.in_lp <= pderiv1.in_lp = 1.000000
+pderiv1.out <= pderiv1.out = 22.999048
+pderiv1.out_lp <= pderiv1.out_lp = 1.000000
+pderiv1.vel_max <= pderiv1.vel_max = 1361.356968
+pderiv1.acc_max <= pderiv1.acc_max = 272271.402777
+pderiv1.res <= pderiv1.res = 100000.000077
+cauto0.pwm_in <= pid0.pwm_cmd = 0.695227
+cauto0.pwm_out <= cauto0.pwm_out = 0.542779
+cauto0.mag_pos_out <= cauto0.mag_pos_out = 0.532292
+cauto0.start <= cauto0.start = 1.000000
+cauto0.ready <= cauto0.ready = 1.000000
+cauto0.offset <= cauto0.offset = 1.495631
+cauto0.fb_in <= enc0.pos1 = -0.670349
+cauto0.fb_out <= cauto0.fb_out = -2.092349
+cauto0.pole_count <= cauto0.pole_count = 3.000000
+cauto0.scale <= cauto0.scale = 0.600000
+cauto0.time <= cauto0.time = 0.500000
+test0.test0 <= test0.test0 = 1.000000
+test0.test1 <= test0.test1 = 0.000000
+test0.test2 <= test0.test2 = 0.000000
+test0.start <= test0.start = 0.000000
+led0.r <= cauto0.start = 1.000000
+led0.g <= cauto0.ready = 1.000000
+led0.y <= led0.y = 0.000000
+net0.enable <= net0.enable = 1.000000
+net0.cmd <= sim0.sin = -1.636500
+net0.fb <= cauto0.fb_out = -1.055378
+net0.cmd_d <= pderiv0.out = 38.537812
+net0.fb_d <= pderiv1.out = 38.350224
\ No newline at end of file