Add make o

Author: mnvr

.gitignore

@@ -5,3 +5,6 @@ inputs/
 
 # Answers
 answers/
+
+# Temporary build files generated, say, by `make o`
+out/

Makefile

@@ -1,6 +1,6 @@
 default: example
 
-.PHONY: example read run test watch verify
+.PHONY: example read run test watch verify o clean
 
 example:
 	@n=`ls -t *.hs | head -1 | cut -f1 -d.`; \
@@ -43,3 +43,17 @@ verify:
 	  cat $$in | runghc $$hs && \
 	  echo "(`cat answers/$$n-a`,`cat answers/$$n-b`)" ;\
 	done
+
+o:
+	@n=`ls -t *.hs | head -1 | cut -f1 -d.`; \
+	in="inputs/$$n"; \
+	hs=`ls -t *.hs | head -1`; \
+	mkdir -p out && \
+	echo "ghc -O -outputdir out -o out/$$n $$hs" && \
+	echo "cat $$in | time ./out/$$n" && \
+	ghc -O -outputdir out -o out/$$n $$hs && \
+	cat $$in | time -h ./out/$$n && \
+	echo "(`cat answers/$$n-a`,`cat answers/$$n-b`)"
+
+clean:
+	rm -rf out

README.md

@@ -18,7 +18,16 @@ Other commands:
 -   `make watch` – same as `make`, but start a fswatch to automatically re-run
     it whenever the .hs file is changed.
 -   `make verify` - Run `make test`, but for all days so far, in reverse.
+-   `make o` - same as `make test`, but first compile the .hs file using GHC
+    with optimizations enabled, and also print timings. To remove these, use
+    `make clean`.
 
 All of these are wrappers around the basic pattern of
 
     cat somefile | runghc xx.hs
+
+Some of the solutions are done in shell scripts. To run these, the filename
+needs to be passed to the script instead of passing the input via stdin (this is
+to keep the scripts simple – reading stdin in a script isn't a snap):
+
+    ./xx.sh somefile