[PATCH 2/7] diff.c: take "prefix" argument in diff_opt_parse()

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

This will be important later when diff_opt_parse() accepts paths as
arguments. Paths must be prefixed before access because setup code
moves cwd but does not (and cannot) update command line options.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/am.c    | 2 +-
 diff-no-index.c | 3 ++-
 diff.c          | 3 ++-
 diff.h          | 2 +-
 revision.c      | 2 +-
 5 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 9fb42fd..f009b6c 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1657,7 +1657,7 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
 
 		init_revisions(&rev_info, NULL);
 		rev_info.diffopt.output_format = DIFF_FORMAT_NAME_STATUS;
-		diff_opt_parse(&rev_info.diffopt, &diff_filter_str, 1);
+		diff_opt_parse(&rev_info.diffopt, &diff_filter_str, 1, rev_info.prefix);
 		add_pending_sha1(&rev_info, "HEAD", our_tree, 0);
 		diff_setup_done(&rev_info.diffopt);
 		run_diff_index(&rev_info, 1);
diff --git a/diff-no-index.c b/diff-no-index.c
index 491e842..03daadb 100644
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -252,7 +252,8 @@ void diff_no_index(struct rev_info *revs,
 		else if (!strcmp(argv[i], "--"))
 			i++;
 		else {
-			j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
+			j = diff_opt_parse(&revs->diffopt, argv + i, argc - i,
+					   revs->prefix);
 			if (j <= 0)
 				die("invalid diff option/value: %s", argv[i]);
 			i += j;
diff --git a/diff.c b/diff.c
index 80eb0c2..8d38fe8 100644
--- a/diff.c
+++ b/diff.c
@@ -3693,7 +3693,8 @@ static int parse_ws_error_highlight(struct diff_options *opt, const char *arg)
 	return 1;
 }
 
-int diff_opt_parse(struct diff_options *options, const char **av, int ac)
+int diff_opt_parse(struct diff_options *options,
+		   const char **av, int ac, const char *prefix)
 {
 	const char *arg = av[0];
 	const char *optarg;
diff --git a/diff.h b/diff.h
index f61ee54..76b5536 100644
--- a/diff.h
+++ b/diff.h
@@ -268,7 +268,7 @@ extern int parse_long_opt(const char *opt, const char **argv,
 extern int git_diff_basic_config(const char *var, const char *value, void *cb);
 extern int git_diff_ui_config(const char *var, const char *value, void *cb);
 extern void diff_setup(struct diff_options *);
-extern int diff_opt_parse(struct diff_options *, const char **, int);
+extern int diff_opt_parse(struct diff_options *, const char **, int, const char *);
 extern void diff_setup_done(struct diff_options *);
 
 #define DIFF_DETECT_RENAME	1
diff --git a/revision.c b/revision.c
index 0a282f5..14daefb 100644
--- a/revision.c
+++ b/revision.c
@@ -2049,7 +2049,7 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
 	} else if (!strcmp(arg, "--ignore-missing")) {
 		revs->ignore_missing = 1;
 	} else {
-		int opts = diff_opt_parse(&revs->diffopt, argv, argc);
+		int opts = diff_opt_parse(&revs->diffopt, argv, argc, revs->prefix);
 		if (!opts)
 			unkv[(*unkc)++] = arg;
 		return opts;
-- 
2.7.0.125.g9eec362