From 26bd4144f74131a55256cc6073d0c36e1e662736 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sun, 2 Jun 2024 13:42:34 +0900
Subject: [PATCH] Add `nightly` recipe

Installs the last revision in the previous `RUBY_RELEASE_DATE`.
---
 common.mk            | 16 ++++++++++++++++
 template/Makefile.in |  4 ++++
 win32/Makefile.sub   |  5 +++++
 3 files changed, 25 insertions(+)

diff --git a/common.mk b/common.mk
index 42c9c65803..516481739e 100644
--- a/common.mk
+++ b/common.mk
@@ -1887,6 +1887,22 @@ ChangeLog:
 	-e 'VCS.detect(ARGV[0]).export_changelog(path: ARGV[1])' \
 	"$(srcdir)" $@
 
+# CAUTION: If using GNU make 3 which does not support `.WAIT`, this
+# recipe with multiple jobs makes build and `git reset` run
+# simultaneously, and will cause inconsistent results.  Run with `-j1`
+# or update GNU make.
+nightly: yesterday $(DOT_WAIT) install
+	$(NULLCMD)
+
+# Rewind to the last commit "yesterday".  "Yesterday" means here the
+# period where `RUBY_RELEASE_DATE` is the day before the date to be
+# generated now.  In short, the yesterday in JST-9 time zone.
+yesterday: rewindable
+
+rewindable:
+	$(GIT) -C $(srcdir) status --porcelain
+	$(GIT) -C $(srcdir) diff --quiet
+
 HELP_EXTRA_TASKS = ""
 
 help: PHONY
diff --git a/template/Makefile.in b/template/Makefile.in
index 22148e7fea..033ac56cb3 100644
--- a/template/Makefile.in
+++ b/template/Makefile.in
@@ -687,3 +687,7 @@ yes-test-syntax-suggest: $(PREPARE_SYNTAX_SUGGEST)
 		$(RSPECOPTS) spec/syntax_suggest/$(SYNTAX_SUGGEST_SPECS)
 	$(ACTIONS_ENDGROUP)
 no-test-syntax-suggest:
+
+yesterday:
+	$(GIT) -C $(srcdir) reset --hard \
+	    `$(GIT) -C $(srcdir) log -1 --before=00:00+0900 --format=%H`
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 61cca10857..b125bf5555 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -1438,3 +1438,8 @@ rubyspec-capiext: $(RUBYSPEC_CAPIEXT_EXTS)
 !endif
 
 exts: rubyspec-capiext
+
+yesterday:
+	for /f "usebackq" %H in \
+	    (`$(GIT) -C $(srcdir) log -1 "--before=00:00+0900" "--format=%H"`) do \
+	    $(GIT) -C $(srcdir) reset --hard %%H