t3901: test "format-patch | am" pipe with i18n

This checks combinations of i18n.commitencoding (declares what
encoding you are feeding commit-tree to make commits) and
i18n.logoutputencoding (instructs what encoding to emit the
commit message out to log output, including e-mail format) to
make sure the "format-patch | am" pipe used in git-rebase works
correctly.

I suspect "git cherry-pick" and "git rebase --merge" may fail
similar tests.  We'll see.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

t/t3901-8859-1.txt

+: to be sourced in t3901 -- this is latin-1
+GIT_AUTHOR_NAME="Áéí óú" &&
+GIT_COMMITTER_NAME=$GIT_AUTHOR_NAME &&
+export GIT_AUTHOR_NAME GIT_COMMITTER_NAME

t/t3901-i18n-patch.sh

+#!/bin/sh
+#
+# Copyright (c) 2006 Junio C Hamano
+#
+
+test_description='i18n settings and format-patch | am pipe'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+	git-repo-config i18n.commitencoding UTF-8 &&
+
+	# use UTF-8 in author and committer name to match the
+	# i18n.commitencoding settings
+	. ../t3901-utf8.txt &&
+
+	test_tick &&
+	echo "$GIT_AUTHOR_NAME" >mine &&
+	git add mine &&
+	git commit -s -m "Initial commit" &&
+
+	test_tick &&
+	echo Hello world >mine &&
+	git add mine &&
+	git commit -s -m "Second on main" &&
+
+	# the first commit on the side branch is UTF-8
+	test_tick &&
+	git checkout -b side master^ &&
+	echo Another file >yours &&
+	git add yours &&
+	git commit -s -m "Second on side" &&
+
+	# the second one on the side branch is ISO-8859-1
+	git-repo-config i18n.commitencoding ISO-8859-1 &&
+	# use author and committer name in ISO-8859-1 to match it.
+	. ../t3901-8859-1.txt &&
+	test_tick &&
+	echo Yet another >theirs &&
+	git add theirs &&
+	git commit -s -m "Third on side" &&
+
+	# Back to default
+	git-repo-config i18n.commitencoding UTF-8
+'
+
+test_expect_success 'format-patch output (ISO-8859-1)' '
+	git-repo-config i18n.logoutputencoding ISO-8859-1 &&
+
+	git format-patch --stdout master..HEAD^ >out-l1 &&
+	git format-patch --stdout HEAD^ >out-l2 &&
+	grep "^Content-Type: text/plain; charset=ISO-8859-1" out-l1 &&
+	grep "^From: =?ISO-8859-1?q?=C1=E9=ED_=F3=FA?=" out-l1 &&
+	grep "^Content-Type: text/plain; charset=ISO-8859-1" out-l2 &&
+	grep "^From: =?ISO-8859-1?q?=C1=E9=ED_=F3=FA?=" out-l2
+'
+
+test_expect_success 'format-patch output (UTF-8)' '
+	git repo-config i18n.logoutputencoding UTF-8 &&
+
+	git format-patch --stdout master..HEAD^ >out-u1 &&
+	git format-patch --stdout HEAD^ >out-u2 &&
+	grep "^Content-Type: text/plain; charset=UTF-8" out-u1 &&
+	grep "^From: =?UTF-8?q?=C3=81=C3=A9=C3=AD_=C3=B3=C3=BA?=" out-u1 &&
+	grep "^Content-Type: text/plain; charset=UTF-8" out-u2 &&
+	grep "^From: =?UTF-8?q?=C3=81=C3=A9=C3=AD_=C3=B3=C3=BA?=" out-u2
+'
+
+test_expect_success 'rebase (UTF-8)' '
+	# We want the result of rebase in UTF-8
+	git-repo-config i18n.commitencoding UTF-8 &&
+
+	# The test is about logoutputencoding not affecting the
+	# final outcome -- it is used internally to generate the
+	# patch and the log.
+
+	git repo-config i18n.logoutputencoding UTF-8 &&
+
+	# The result will be committed by GIT_COMMITTER_NAME --
+	# we want UTF-8 encoded name.
+	. ../t3901-utf8.txt &&
+	git checkout -b test &&
+	git-rebase master &&
+
+	# Check the results.
+	git format-patch --stdout HEAD~2..HEAD^ >out-r1 &&
+	git format-patch --stdout HEAD^ >out-r2 &&
+	grep "^From: =?UTF-8?q?=C3=81=C3=A9=C3=AD_=C3=B3=C3=BA?=" out-r1 &&
+	grep "^From: =?UTF-8?q?=C3=81=C3=A9=C3=AD_=C3=B3=C3=BA?=" out-r2
+
+	! git-cat-file commit HEAD | grep "^encoding ISO-8859-1" &&
+	! git-cat-file commit HEAD^ | grep "^encoding ISO-8859-1"
+'
+
+test_expect_success 'rebase (ISO-8859-1)' '
+	git-repo-config i18n.commitencoding UTF-8 &&
+	git repo-config i18n.logoutputencoding ISO-8859-1 &&
+	. ../t3901-utf8.txt &&
+
+	git reset --hard side &&
+	git-rebase master &&
+
+	git repo-config i18n.logoutputencoding UTF-8 &&
+	git format-patch --stdout HEAD~2..HEAD^ >out-r1 &&
+	git format-patch --stdout HEAD^ >out-r2 &&
+	grep "^From: =?UTF-8?q?=C3=81=C3=A9=C3=AD_=C3=B3=C3=BA?=" out-r1 &&
+	grep "^From: =?UTF-8?q?=C3=81=C3=A9=C3=AD_=C3=B3=C3=BA?=" out-r2 &&
+
+	! git-cat-file commit HEAD | grep "^encoding ISO-8859-1" &&
+	! git-cat-file commit HEAD^ | grep "^encoding ISO-8859-1"
+'
+
+test_expect_success 'rebase (ISO-8859-1)' '
+	# In this test we want ISO-8859-1 encoded commits as the result
+	git-repo-config i18n.commitencoding ISO-8859-1 &&
+	git repo-config i18n.logoutputencoding ISO-8859-1 &&
+	. ../t3901-8859-1.txt &&
+
+	git reset --hard side &&
+	git-rebase master &&
+
+	# Make sure characters are not corrupted.
+	git repo-config i18n.logoutputencoding UTF-8 &&
+	git format-patch --stdout HEAD~2..HEAD^ >out-r1 &&
+	git format-patch --stdout HEAD^ >out-r2 &&
+	grep "^From: =?UTF-8?q?=C3=81=C3=A9=C3=AD_=C3=B3=C3=BA?=" out-r1 &&
+	grep "^From: =?UTF-8?q?=C3=81=C3=A9=C3=AD_=C3=B3=C3=BA?=" out-r2 &&
+
+	git-cat-file commit HEAD | grep "^encoding ISO-8859-1" &&
+	git-cat-file commit HEAD^ | grep "^encoding ISO-8859-1"
+'
+
+test_expect_success 'rebase (UTF-8)' '
+	# This is pathological -- use UTF-8 as intermediate form
+	# to get ISO-8859-1 results.
+	git-repo-config i18n.commitencoding ISO-8859-1 &&
+	git repo-config i18n.logoutputencoding UTF-8 &&
+	. ../t3901-8859-1.txt &&
+
+	git reset --hard side &&
+	git-rebase master &&
+
+	# Make sure characters are not corrupted.
+	git repo-config i18n.logoutputencoding UTF-8 &&
+	git format-patch --stdout HEAD~2..HEAD^ >out-r1 &&
+	git format-patch --stdout HEAD^ >out-r2 &&
+	grep "^From: =?UTF-8?q?=C3=81=C3=A9=C3=AD_=C3=B3=C3=BA?=" out-r1 &&
+	grep "^From: =?UTF-8?q?=C3=81=C3=A9=C3=AD_=C3=B3=C3=BA?=" out-r2 &&
+
+	git-cat-file commit HEAD | grep "^encoding ISO-8859-1" &&
+	git-cat-file commit HEAD^ | grep "^encoding ISO-8859-1"
+'
+
+test_done

t/t3901-utf8.txt

+: to be sourced in t3901 -- this is utf8
+GIT_AUTHOR_NAME="Áéí óú" &&
+GIT_COMMITTER_NAME=$GIT_AUTHOR_NAME &&
+export GIT_AUTHOR_NAME GIT_COMMITTER_NAME