add-patch: use repository instance from add_i_state instead of the_repository

Functions parse_diff(), edit_hunk_manually() and patch_update_file() use
the_repository even though a repository instance is already available via
struct add_i_state s which is defined in struct add_p_state *s.

Use 's->s.r' instead of the_repository to avoid relying on global state. All
callers pass a valid add_p_state and this does not change any behavior.

This aligns with the ongoing effort to reduce usage of the_repository global
state.

Signed-off-by: Shreyansh Paliwal <shreyanshpaliwalcmsmn@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: shreyp135

add-patch.c

@@ -434,8 +434,8 @@ static int parse_diff(struct add_p_state *s, const struct pathspec *ps)
 		strvec_push(&args,
 			    /* could be on an unborn branch */
 			    !strcmp("HEAD", s->revision) &&
-			    repo_get_oid(the_repository, "HEAD", &oid) ?
-			    empty_tree_oid_hex(the_repository->hash_algo) : s->revision);
+			    repo_get_oid(s->s.r, "HEAD", &oid) ?
+			    empty_tree_oid_hex(s->s.r->hash_algo) : s->revision);
 	}
 	color_arg_index = args.nr;
 	/* Use `--no-color` explicitly, just in case `diff.color = always`. */
@@ -1147,7 +1147,7 @@ static int edit_hunk_manually(struct add_p_state *s, struct hunk *hunk)
 				"removed, then the edit is\n"
 				"aborted and the hunk is left unchanged.\n"));
 
-	if (strbuf_edit_interactively(the_repository, &s->buf,
+	if (strbuf_edit_interactively(s->s.r, &s->buf,
 				      "addp-hunk-edit.diff", NULL) < 0)
 		return -1;
 
@@ -1551,7 +1551,7 @@ static size_t patch_update_file(struct add_p_state *s, size_t idx)
 		if (file_diff->hunk_nr) {
 			if (rendered_hunk_index != hunk_index) {
 				if (use_pager) {
-					setup_pager(the_repository);
+					setup_pager(s->s.r);
 					sigchain_push(SIGPIPE, SIG_IGN);
 				}
 				render_hunk(s, hunk, 0, colored, &s->buf);