From 4f4a0353e16ea2e75965e807f9464d99099143f0 Mon Sep 17 00:00:00 2001
From: Siraaj Khandkar <siraaj@khandkar.net>
Date: Mon, 21 Sep 2020 15:18:56 -0400
Subject: [PATCH 1/1] Improve tracking and showing init and final

---
 home/bin/seq2dot | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/home/bin/seq2dot b/home/bin/seq2dot
index d91e45b..ac42323 100755
--- a/home/bin/seq2dot
+++ b/home/bin/seq2dot
@@ -4,17 +4,39 @@
 # highlighting frequencies of pairings.
 #
 
-BEGIN {print "digraph {"}
-
 {
-    prev = prev ? prev : "--"
     curr = $0
+}
+
+NR == 1 {
+    init = curr
+}
+
+NR > 1 {
     ++nlinks[prev]
     ++nlinks_to[prev, curr]
+}
+
+{
     prev = curr
 }
 
 END {
+    final = curr
+    print "digraph {"
+    if (init == final) {
+        printf \
+            "\"%s\" [penwidth=10, style=filled, fillcolor=tomato    , fontcolor=white, color=yellowgreen];\n", \
+                init
+    } else {
+        printf \
+            "\"%s\" [penwidth=0, style=filled, fillcolor=yellowgreen, fontcolor=white];\n", \
+            init
+        printf \
+            "\"%s\" [penwidth=0, style=filled, fillcolor=tomato     , fontcolor=white];\n", \
+            final
+    }
+
     for (src_dst in nlinks_to) {
         split(src_dst, sd, SUBSEP);
         src = sd[1]
-- 
2.20.1