From b745bf393801aedb3ab336b9974c88377dc5dd23 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Fri, 19 Feb 2021 10:12:29 -0800
Subject: make bench: compare against a baseline, use datestamps for bench
 results.

---
 Makefile | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index 4f72ac9d4..134aedcb4 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,13 @@ pandoc=$(shell find dist -name pandoc -type f -exec ls -t {} \; | head -1)
 SOURCEFILES?=$(shell git ls-tree -r master --name-only | grep "\.hs$$")
 BRANCH?=master
 COMMIT=$(shell git rev-parse --short HEAD)
+TIMESTAMP=$(shell date "+%Y%m%d_%H%M")
+LATESTBENCH=$(word 1,$(shell ls -t bench_*.csv))
+ifeq ($(LATESTBENCH),)
+BASELINE=
+else
+BASELINE=--baseline $(LATESTBENCH)
+endif
 GHCOPTS=-fdiagnostics-color=always
 WEBSITE=../../web/pandoc.org
 REVISION?=1
@@ -39,7 +46,7 @@ ghcid:
 	ghcid -c "stack repl --flag 'pandoc:embed_data_files'"
 
 bench:
-	stack bench --benchmark-arguments='$(BENCHARGS) --csv bench-$(COMMIT).csv' --ghc-options '$(GHCOPTS)'
+	stack bench --benchmark-arguments='$(BENCHARGS) $(BASELINE) --csv bench_$(TIMESTAMP).csv' --ghc-options '$(GHCOPTS)'
 
 weigh:
 	stack build --ghc-options '$(GHCOPTS)' pandoc:weigh-pandoc && stack exec weigh-pandoc
-- 
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