From 8559cc01c88addff1e3970519775d08c121ce5bf Mon Sep 17 00:00:00 2001
From: Brett Parker <iDunno@sommitrealweird.co.uk>
Date: Tue, 8 Dec 2020 21:28:45 +0000
Subject: [PATCH] Minor refactor start

---
 day10/check_asteroids.sh | 14 ++------------
 day10/common.sh          | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 12 deletions(-)
 create mode 100644 day10/common.sh

diff --git a/day10/check_asteroids.sh b/day10/check_asteroids.sh
index bf54544..efda359 100755
--- a/day10/check_asteroids.sh
+++ b/day10/check_asteroids.sh
@@ -5,6 +5,8 @@ set -e
 
 basedir=$(dirname $(readlink -f ${BASH_SOURCE}))
 
+. $basedir/common.sh
+
 filename=${1:-$basedir/3_4_8.txt}
 
 exec 3<$filename
@@ -37,18 +39,6 @@ debug_line() {
     echo "$line" >&2
 }
 
-get_vector() {
-    local x1=$1
-    local y1=$2
-    local x2=$3
-    local y2=$4
-
-    x_diff=$(($x1 - $x2))
-    y_diff=$(($y1 - $y2))
-
-    echo "$x_diff,$y_diff"
-}
-
 check_collision() {
     # we want to know if vector2 is going to get in the way of vector1
     local vector1=$1
diff --git a/day10/common.sh b/day10/common.sh
new file mode 100644
index 0000000..86979ed
--- /dev/null
+++ b/day10/common.sh
@@ -0,0 +1,25 @@
+get_vector() {
+    local x1=$1
+    local y1=$2
+    local x2=$3
+    local y2=$4
+
+    x_diff=$(($x1 - $x2))
+    y_diff=$(($y1 - $y2))
+
+    echo "$x_diff,$y_diff"
+}
+
+get_asteroids_vector() {
+    local a1=$1
+    local a2=$2
+
+    local x1=${a1%,*}
+    local y1=${a1#*,}
+    local x2=${a2%,*}
+    local y2=${a2%*,}
+
+    get_vector $x1 $y1 $x2 $y2
+}
+
+
-- 
2.39.5