builtin-am: pass git-apply's options to git-apply

git-am.sh recognizes some of git-apply's options, and would pass them to
git-apply:

* --whitespace, since 8c31cb8 (git-am: --whitespace=x option.,
  2006-02-28)

* -C, since 67dad68 (add -C[NUM] to git-am, 2007-02-08)

* -p, since 2092a1f (Teach git-am to pass -p option down to git-apply,
  2007-02-11)

* --directory, since b47dfe9 (git-am: add --directory=<dir> option,
  2009-01-11)

* --reject, since b80da42 (git-am: implement --reject option passed to
  git-apply, 2009-01-23)

* --ignore-space-change, --ignore-whitespace, since 86c91f9 (git apply:
  option to ignore whitespace differences, 2009-08-04)

* --exclude, since 77e9e49 (am: pass exclude down to apply, 2011-08-03)

* --include, since 58725ef (am: support --include option, 2012-03-28)

* --reject, since b80da42 (git-am: implement --reject option passed to
  git-apply, 2009-01-23)

Re-implement support for these options in builtin/am.c.

Signed-off-by: Paul Tan <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pyokagan

builtin/am.c

@@ -106,6 +106,7 @@ struct am_state {
 	int keep; /* enum keep_type */
 	int message_id;
 	int scissors; /* enum scissors_type */
+	struct argv_array git_apply_opts;
 	const char *resolvemsg;
 	int rebasing;
 };
@@ -128,6 +129,8 @@ static void am_state_init(struct am_state *state, const char *dir)
 	git_config_get_bool("am.messageid", &state->message_id);
 
 	state->scissors = SCISSORS_UNSET;
+
+	argv_array_init(&state->git_apply_opts);
 }
 
 /**
@@ -140,6 +143,7 @@ static void am_state_release(struct am_state *state)
 	free(state->author_email);
 	free(state->author_date);
 	free(state->msg);
+	argv_array_clear(&state->git_apply_opts);
 }
 
 /**
@@ -411,6 +415,11 @@ static void am_load(struct am_state *state)
 	else
 		state->scissors = SCISSORS_UNSET;
 
+	read_state_file(&sb, state, "apply-opt", 1);
+	argv_array_clear(&state->git_apply_opts);
+	if (sq_dequote_to_argv_array(sb.buf, &state->git_apply_opts) < 0)
+		die(_("could not parse %s"), am_path(state, "apply-opt"));
+
 	state->rebasing = !!file_exists(am_path(state, "rebasing"));
 
 	strbuf_release(&sb);
@@ -585,6 +594,7 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 {
 	unsigned char curr_head[GIT_SHA1_RAWSZ];
 	const char *str;
+	struct strbuf sb = STRBUF_INIT;
 
 	if (!patch_format)
 		patch_format = detect_patch_format(paths);
@@ -647,6 +657,9 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 
 	write_file(am_path(state, "scissors"), 1, "%s", str);
 
+	sq_quote_argv(&sb, state->git_apply_opts.argv, 0);
+	write_file(am_path(state, "apply-opt"), 1, "%s", sb.buf);
+
 	if (state->rebasing)
 		write_file(am_path(state, "rebasing"), 1, "%s", "");
 	else
@@ -671,6 +684,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 	write_file(am_path(state, "next"), 1, "%d", state->cur);
 
 	write_file(am_path(state, "last"), 1, "%d", state->last);
+
+	strbuf_release(&sb);
 }
 
 /**
@@ -1058,6 +1073,8 @@ static int run_apply(const struct am_state *state, const char *index_file)
 
 	argv_array_push(&cp.args, "apply");
 
+	argv_array_pushv(&cp.args, state->git_apply_opts.argv);
+
 	if (index_file)
 		argv_array_push(&cp.args, "--cached");
 	else
@@ -1084,6 +1101,7 @@ static int build_fake_ancestor(const struct am_state *state, const char *index_f
 
 	cp.git_cmd = 1;
 	argv_array_push(&cp.args, "apply");
+	argv_array_pushv(&cp.args, state->git_apply_opts.argv);
 	argv_array_pushf(&cp.args, "--build-fake-ancestor=%s", index_file);
 	argv_array_push(&cp.args, am_path(state, "patch"));
 
@@ -1599,9 +1617,36 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		  PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 0},
 		OPT_BOOL('c', "scissors", &state.scissors,
 			N_("strip everything before a scissors line")),
+		OPT_PASSTHRU_ARGV(0, "whitespace", &state.git_apply_opts, N_("action"),
+			N_("pass it through git-apply"),
+			0),
+		OPT_PASSTHRU_ARGV(0, "ignore-space-change", &state.git_apply_opts, NULL,
+			N_("pass it through git-apply"),
+			PARSE_OPT_NOARG),
+		OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &state.git_apply_opts, NULL,
+			N_("pass it through git-apply"),
+			PARSE_OPT_NOARG),
+		OPT_PASSTHRU_ARGV(0, "directory", &state.git_apply_opts, N_("root"),
+			N_("pass it through git-apply"),
+			0),
+		OPT_PASSTHRU_ARGV(0, "exclude", &state.git_apply_opts, N_("path"),
+			N_("pass it through git-apply"),
+			0),
+		OPT_PASSTHRU_ARGV(0, "include", &state.git_apply_opts, N_("path"),
+			N_("pass it through git-apply"),
+			0),
+		OPT_PASSTHRU_ARGV('C', NULL, &state.git_apply_opts, N_("n"),
+			N_("pass it through git-apply"),
+			0),
+		OPT_PASSTHRU_ARGV('p', NULL, &state.git_apply_opts, N_("num"),
+			N_("pass it through git-apply"),
+			0),
 		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
 			N_("format the patch(es) are in"),
 			parse_opt_patchformat),
+		OPT_PASSTHRU_ARGV(0, "reject", &state.git_apply_opts, NULL,
+			N_("pass it through git-apply"),
+			PARSE_OPT_NOARG),
 		OPT_STRING(0, "resolvemsg", &state.resolvemsg, NULL,
 			N_("override error message when patch failure occurs")),
 		OPT_CMDMODE(0, "continue", &resume,