rebase -i: check for missing commits in the rebase--helper

In particular on Windows, where shell scripts are even more expensive
than on MacOSX or Linux, it makes sense to move a loop that forks
Git at least once for every line in the todo list into a builtin.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 159 deletions

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index d5df024..c8cad31 100644
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -867,96 +867,6 @@ add_exec_commands () {
 	mv "$1.new" "$1"
 }
 
-# Check if the SHA-1 passed as an argument is a
-# correct one, if not then print $2 in "$todo".badsha
-# $1: the SHA-1 to test
-# $2: the line number of the input
-# $3: the input filename
-check_commit_sha () {
-	badsha=0
-	if test -z "$1"
-	then
-		badsha=1
-	else
-		sha1_verif="$(git rev-parse --verify --quiet $1^{commit})"
-		if test -z "$sha1_verif"
-		then
-			badsha=1
-		fi
-	fi
-
-	if test $badsha -ne 0
-	then
-		line="$(sed -n -e "${2}p" "$3")"
-		warn "$(eval_gettext "\
-Warning: the SHA-1 is missing or isn't a commit in the following line:
- - \$line")"
-		warn
-	fi
-
-	return $badsha
-}
-
-# prints the bad commits and bad commands
-# from the todolist in stdin
-check_bad_cmd_and_sha () {
-	retval=0
-	lineno=0
-	while read -r command rest
-	do
-		lineno=$(( $lineno + 1 ))
-		case $command in
-		"$comment_char"*|''|noop|x|exec)
-			# Doesn't expect a SHA-1
-			;;
-		"$cr")
-			# Work around CR left by "read" (e.g. with Git for
-			# Windows' Bash).
-			;;
-		pick|p|drop|d|reword|r|edit|e|squash|s|fixup|f)
-			if ! check_commit_sha "${rest%%[ 	]*}" "$lineno" "$1"
-			then
-				retval=1
-			fi
-			;;
-		*)
-			line="$(sed -n -e "${lineno}p" "$1")"
-			warn "$(eval_gettext "\
-Warning: the command isn't recognized in the following line:
- - \$line")"
-			warn
-			retval=1
-			;;
-		esac
-	done <"$1"
-	return $retval
-}
-
-# Print the list of the SHA-1 of the commits
-# from stdin to stdout
-todo_list_to_sha_list () {
-	git stripspace --strip-comments |
-	while read -r command sha1 rest
-	do
-		case $command in
-		"$comment_char"*|''|noop|x|"exec")
-			;;
-		*)
-			long_sha=$(git rev-list --no-walk "$sha1" 2>/dev/null)
-			printf "%s\n" "$long_sha"
-			;;
-		esac
-	done
-}
-
-# Use warn for each line in stdin
-warn_lines () {
-	while read -r line
-	do
-		warn " - $line"
-	done
-}
-
 # Switch to the branch in $into and notify it in the reflog
 checkout_onto () {
 	GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name"
@@ -971,74 +881,6 @@ get_missing_commit_check_level () {
 	printf '%s' "$check_level" | tr 'A-Z' 'a-z'
 }
 
-# Check if the user dropped some commits by mistake
-# Behaviour determined by rebase.missingCommitsCheck.
-# Check if there is an unrecognized command or a
-# bad SHA-1 in a command.
-check_todo_list () {
-	raise_error=f
-
-	check_level=$(get_missing_commit_check_level)
-
-	case "$check_level" in
-	warn|error)
-		# Get the SHA-1 of the commits
-		todo_list_to_sha_list <"$todo".backup >"$todo".oldsha1
-		todo_list_to_sha_list <"$todo" >"$todo".newsha1
-
-		# Sort the SHA-1 and compare them
-		sort -u "$todo".oldsha1 >"$todo".oldsha1+
-		mv "$todo".oldsha1+ "$todo".oldsha1
-		sort -u "$todo".newsha1 >"$todo".newsha1+
-		mv "$todo".newsha1+ "$todo".newsha1
-		comm -2 -3 "$todo".oldsha1 "$todo".newsha1 >"$todo".miss
-
-		# Warn about missing commits
-		if test -s "$todo".miss
-		then
-			test "$check_level" = error && raise_error=t
-
-			warn "$(gettext "\
-Warning: some commits may have been dropped accidentally.
-Dropped commits (newer to older):")"
-
-			# Make the list user-friendly and display
-			opt="--no-walk=sorted --format=oneline --abbrev-commit --stdin"
-			git rev-list $opt <"$todo".miss | warn_lines
-
-			warn "$(gettext "\
-To avoid this message, use \"drop\" to explicitly remove a commit.
-
-Use 'git config rebase.missingCommitsCheck' to change the level of warnings.
-The possible behaviours are: ignore, warn, error.")"
-			warn
-		fi
-		;;
-	ignore)
-		;;
-	*)
-		warn "$(eval_gettext "Unrecognized setting \$check_level for option rebase.missingCommitsCheck. Ignoring.")"
-		;;
-	esac
-
-	if ! check_bad_cmd_and_sha "$todo"
-	then
-		raise_error=t
-	fi
-
-	if test $raise_error = t
-	then
-		# Checkout before the first commit of the
-		# rebase: this way git rebase --continue
-		# will work correctly as it expects HEAD to be
-		# placed before the commit of the next action
-		checkout_onto
-
-		warn "$(gettext "You can fix this with 'git rebase --edit-todo' and then run 'git rebase --continue'.")"
-		die "$(gettext "Or you can abort the rebase with 'git rebase --abort'.")"
-	fi
-}
-
 # The whole contents of this file is run by dot-sourcing it from
 # inside a shell function.  It used to be that "return"s we see
 # below were not inside any function, and expected to return
@@ -1299,7 +1141,11 @@ git_sequence_editor "$todo" ||
 has_action "$todo" ||
 	return 2
 
-check_todo_list
+git rebase--helper --check-todo-list || {
+	ret=$?
+	checkout_onto
+	exit $ret
+}
 
 expand_todo_ids