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+# Helper functions used by interactive rebase tests.
+
+# After setting the fake editor with this function, you can
+#
+# - override the commit message with $FAKE_COMMIT_MESSAGE
+# - amend the commit message with $FAKE_COMMIT_AMEND
+# - copy the original commit message to a file with $FAKE_MESSAGE_COPY
+# - check that non-commit messages have a certain line count with $EXPECT_COUNT
+# - check the commit count in the commit message header with $EXPECT_HEADER_COUNT
+# - rewrite a rebase -i script as directed by $FAKE_LINES.
+# $FAKE_LINES consists of a sequence of words separated by spaces.
+# The following word combinations are possible:
+#
+# "<lineno>" -- add a "pick" line with the SHA1 taken from the
+# specified line.
+#
+# "<cmd> <lineno>" -- add a line with the specified command
+# ("pick", "squash", "fixup"|"fixup_-C"|"fixup_-c", "edit", "reword" or "drop")
+# and the SHA1 taken from the specified line.
+#
+# "_" -- add a space, like "fixup_-C" implies "fixup -C" and
+# "exec_cmd_with_args" add an "exec cmd with args" line.
+#
+# "#" -- Add a comment line.
+#
+# ">" -- Add a blank line.
+
+set_fake_editor () {
+ write_script fake-editor.sh <<-\EOF
+ case "$1" in
+ */COMMIT_EDITMSG)
+ test -z "$EXPECT_HEADER_COUNT" ||
+ test "$EXPECT_HEADER_COUNT" = "$(sed -n '1s/^# This is a combination of \(.*\) commits\./\1/p' < "$1")" ||
+ exit
+ test -z "$FAKE_COMMIT_MESSAGE" || echo "$FAKE_COMMIT_MESSAGE" > "$1"
+ test -z "$FAKE_COMMIT_AMEND" || echo "$FAKE_COMMIT_AMEND" >> "$1"
+ test -z "$FAKE_MESSAGE_COPY" || cat "$1" >"$FAKE_MESSAGE_COPY"
+ exit
+ ;;
+ esac
+ test -z "$EXPECT_COUNT" ||
+ test "$EXPECT_COUNT" = $(sed -e '/^#/d' -e '/^$/d' < "$1" | wc -l) ||
+ exit
+ test -z "$FAKE_LINES" && exit
+ grep -v '^#' < "$1" > "$1".tmp
+ rm -f "$1"
+ echo 'rebase -i script before editing:'
+ cat "$1".tmp
+ action=\&
+ for line in $FAKE_LINES; do
+ case $line in
+ pick|p|squash|s|fixup|f|edit|e|reword|r|drop|d|label|l|reset|r|merge|m)
+ action="$line";;
+ exec_*|x_*|break|b)
+ echo "$line" | sed 's/_/ /g' >> "$1";;
+ merge_*|fixup_*)
+ action=$(echo "$line" | sed 's/_/ /g');;
+ "#")
+ echo '# comment' >> "$1";;
+ ">")
+ echo >> "$1";;
+ bad)
+ action="badcmd";;
+ fakesha)
+ test \& != "$action" || action=pick
+ echo "$action XXXXXXX False commit" >> "$1"
+ action=pick;;
+ *)
+ sed -n "${line}s/^[a-z][a-z]*/$action/p" < "$1".tmp >> "$1"
+ action=\&;;
+ esac
+ done
+ echo 'rebase -i script after editing:'
+ cat "$1"
+ EOF
+
+ test_set_editor "$(pwd)/fake-editor.sh"
+}
+
+# After set_cat_todo_editor, rebase -i will write the todo list (ignoring
+# blank lines and comments) to stdout, and exit failure (so you should run
+# it with test_must_fail). This can be used to verify the expected user
+# experience, for todo list changes that do not affect the outcome of
+# rebase; or as an extra check in addition to checking the outcome.
+
+set_cat_todo_editor () {
+ write_script fake-editor.sh <<-\EOF
+ grep "^[^#]" "$1"
+ exit 1
+ EOF
+ test_set_editor "$(pwd)/fake-editor.sh"
+}
+
+# checks that the revisions in "$2" represent a linear range with the
+# subjects in "$1"
+test_linear_range () {
+ revlist_merges=$(git rev-list --merges "$2") &&
+ test -z "$revlist_merges" &&
+ expected=$1
+ set -- $(git log --reverse --format=%s "$2")
+ test "$expected" = "$*"
+}
+
+reset_rebase () {
+ test_might_fail git rebase --abort &&
+ git reset --hard &&
+ git clean -f
+}
+
+cherry_pick () {
+ git cherry-pick -n "$2" &&
+ git commit -m "$1" &&
+ git tag "$1"
+}
+
+revert () {
+ git revert -n "$2" &&
+ git commit -m "$1" &&
+ git tag "$1"
+}
+
+make_empty () {
+ git commit --allow-empty -m "$1" &&
+ git tag "$1"
+}
+
+# Call this (inside test_expect_success) at the end of a test file to
+# check that no tests have changed editor related environment
+# variables or config settings
+test_editor_unchanged () {
+ # We're only interested in exported variables hence 'sh -c'
+ sh -c 'cat >actual <<-EOF
+ EDITOR=$EDITOR
+ FAKE_COMMIT_AMEND=$FAKE_COMMIT_AMEND
+ FAKE_COMMIT_MESSAGE=$FAKE_COMMIT_MESSAGE
+ FAKE_LINES=$FAKE_LINES
+ GIT_EDITOR=$GIT_EDITOR
+ GIT_SEQUENCE_EDITOR=$GIT_SEQUENCE_EDITOR
+ core.editor=$(git config core.editor)
+ sequence.editor=$(git config sequence.editor)
+ EOF'
+ cat >expect <<-\EOF
+ EDITOR=:
+ FAKE_COMMIT_AMEND=
+ FAKE_COMMIT_MESSAGE=
+ FAKE_LINES=
+ GIT_EDITOR=
+ GIT_SEQUENCE_EDITOR=
+ core.editor=
+ sequence.editor=
+ EOF
+ test_cmp expect actual
+}
+
+# Set up an editor for testing reword commands
+# Checks that there are no uncommitted changes when rewording and that the
+# todo-list is reread after each
+set_reword_editor () {
+ >reword-actual &&
+ >reword-oid &&
+
+ # Check rewording keeps the original authorship
+ GIT_AUTHOR_NAME="Reword Author"
+ GIT_AUTHOR_EMAIL="reword.author@example.com"
+ GIT_AUTHOR_DATE=@123456
+
+ write_script reword-sequence-editor.sh <<-\EOF &&
+ todo="$(cat "$1")" &&
+ echo "exec git log -1 --pretty=format:'%an <%ae> %at%n%B%n' \
+ >>reword-actual" >"$1" &&
+ printf "%s\n" "$todo" >>"$1"
+ EOF
+
+ write_script reword-editor.sh <<-EOF &&
+ # Save the oid of the first reworded commit so we can check rebase
+ # fast-forwards to it. Also check that we do not write .git/MERGE_MSG
+ # when fast-forwarding
+ if ! test -s reword-oid
+ then
+ git rev-parse HEAD >reword-oid &&
+ if test -f .git/MERGE_MSG
+ then
+ echo 1>&2 "error: .git/MERGE_MSG exists"
+ exit 1
+ fi
+ fi &&
+ # There should be no uncommited changes
+ git diff --exit-code HEAD &&
+ # The todo-list should be re-read after a reword
+ GIT_SEQUENCE_EDITOR="\"$PWD/reword-sequence-editor.sh\"" \
+ git rebase --edit-todo &&
+ echo edited >>"\$1"
+ EOF
+
+ test_set_editor "$PWD/reword-editor.sh"
+}
+
+# Check the results of a rebase after calling set_reword_editor
+# Pass the commits that were reworded in the order that they were picked
+# Expects the first pick to be a fast-forward
+check_reworded_commits () {
+ test_cmp_rev "$(cat reword-oid)" "$1^{commit}" &&
+ git log --format="%an <%ae> %at%n%B%nedited%n" --no-walk=unsorted "$@" \
+ >reword-expected &&
+ test_cmp reword-expected reword-actual &&
+ git log --format="%an <%ae> %at%n%B" -n $# --first-parent --reverse \
+ >reword-log &&
+ test_cmp reword-expected reword-log
+}
+
+# usage: set_replace_editor <file>
+#
+# Replace the todo file with the exact contents of the given file.
+set_replace_editor () {
+ cat >script <<-\EOF &&
+ cat FILENAME >"$1"
+
+ echo 'rebase -i script after editing:'
+ cat "$1"
+ EOF
+
+ sed -e "s/FILENAME/$1/g" <script | write_script fake-editor.sh &&
+ test_set_editor "$(pwd)/fake-editor.sh"
+}