[PATCH v2 3/6] revision: support NUL-delimited --stdin mode

[Justin Tobler <jltobler@gmail.com>]

When `setup_revisions()` parses the `--stdin` option, revision and
pathspec arguments are read from stdin. Each line of input is handled as
a separate argument.

Introduce the `nul_delim_stdin` field to `setup_revision_opt` that, when
enabled, uses a NUL byte to delimit between stdin arguments instead of
newline.

Signed-off-by: Justin Tobler <jltobler@gmail.com>
---
 revision.c | 19 +++++++++++--------
 revision.h |  3 ++-
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/revision.c b/revision.c
index 0eaebe4478..5de6309830 100644
--- a/revision.c
+++ b/revision.c
@@ -2275,10 +2275,10 @@ int handle_revision_arg(const char *arg, struct rev_info *revs, int flags, unsig
 	return ret;
 }
 
-static void read_pathspec_from_stdin(struct strbuf *sb,
-				     struct strvec *prune)
+static void read_pathspec_from_stdin(struct strbuf *sb, struct strvec *prune,
+				     int line_term)
 {
-	while (strbuf_getline(sb, stdin) != EOF)
+	while (strbuf_getdelim_strip_crlf(sb, stdin, line_term) != EOF)
 		strvec_push(prune, sb->buf);
 }
 
@@ -2905,8 +2905,8 @@ static int handle_revision_pseudo_opt(struct rev_info *revs,
 	return 1;
 }
 
-static void read_revisions_from_stdin(struct rev_info *revs,
-				      struct strvec *prune)
+static void read_revisions_from_stdin(struct rev_info *revs, struct strvec *prune,
+				      int line_term)
 {
 	struct strbuf sb;
 	int seen_dashdash = 0;
@@ -2918,7 +2918,7 @@ static void read_revisions_from_stdin(struct rev_info *revs,
 	warn_on_object_refname_ambiguity = 0;
 
 	strbuf_init(&sb, 1000);
-	while (strbuf_getline(&sb, stdin) != EOF) {
+	while (strbuf_getdelim_strip_crlf(&sb, stdin, line_term) != EOF) {
 		if (!sb.len)
 			break;
 
@@ -2946,7 +2946,7 @@ static void read_revisions_from_stdin(struct rev_info *revs,
 			die("bad revision '%s'", sb.buf);
 	}
 	if (seen_dashdash)
-		read_pathspec_from_stdin(&sb, prune);
+		read_pathspec_from_stdin(&sb, prune, line_term);
 
 	strbuf_release(&sb);
 	warn_on_object_refname_ambiguity = save_warning;
@@ -3019,13 +3019,16 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
 			}
 
 			if (!strcmp(arg, "--stdin")) {
+				int term = opt && opt->nul_delim_stdin ? '\0' : '\n';
+
 				if (revs->disable_stdin) {
 					argv[left++] = arg;
 					continue;
 				}
 				if (revs->read_from_stdin++)
 					die("--stdin given twice?");
-				read_revisions_from_stdin(revs, &prune_data);
+				read_revisions_from_stdin(revs, &prune_data,
+							  term);
 				continue;
 			}
 
diff --git a/revision.h b/revision.h
index 21c6a69899..0e680c3667 100644
--- a/revision.h
+++ b/revision.h
@@ -439,7 +439,8 @@ struct setup_revision_opt {
 	void (*tweak)(struct rev_info *);
 	unsigned int	assume_dashdash:1,
 			allow_exclude_promisor_objects:1,
-			free_removed_argv_elements:1;
+			free_removed_argv_elements:1,
+			nul_delim_stdin:1;
 	unsigned revarg_opt;
 };
 int setup_revisions(int argc, const char **argv, struct rev_info *revs,
-- 
2.49.0.rc2