Add Day 1

.gitignore

@@ -0,0 +1,2 @@
+*input
+*test

day1

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+#!/usr/bin/fish
+
+cat $argv[1] \
+    # there's definitely a more elegant way to do this,
+    # but maybe not with sed, and probably not readably
+    | sed -E 's/oneight/18/g;
+              s/twone/21/g;
+              s/threeight/38/g;
+              s/fiveight/58/g;
+              s/sevenine/79/g;
+              s/eightwo/82/g;
+              s/eighthree/83/g;
+              s/nineight/98/g;
+              s/zerone/01/g;
+              s/one/1/g;
+              s/two/2/g;
+              s/three/3/g;
+              s/four/4/g;
+              s/five/5/g;
+              s/six/6/g;
+              s/seven/7/g;
+              s/eight/8/g;
+              s/nine/9/g;
+              s/zero/0/g;
+              s/[a-zA-Z]//g;
+              s/([0-9]{1})[0-9]*([0-9]{1})/\1\2/g
+              s/^([0-9]{1})$/\1\1/g' \
+    | tr '\n' '+' \
+    | sed 's/+$/\n/g;
+           s/^+//g' \
+    | bc