builtin/apply: move applying patches into apply_all_patches()

To libify the apply functionality we should provide a function to
apply many patches. Let's move the code to do that into a new
apply_all_patches() function.

Reviewed-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/apply.c

@@ -4707,13 +4707,80 @@ static void check_apply_state(struct apply_state *state, int force_apply)
 		state->unsafe_paths = 0;
 }
 
-int cmd_apply(int argc, const char **argv, const char *prefix)
+static int apply_all_patches(struct apply_state *state,
+			     int argc,
+			     const char **argv,
+			     int options)
 {
 	int i;
 	int errs = 0;
+	int read_stdin = 1;
+
+	for (i = 0; i < argc; i++) {
+		const char *arg = argv[i];
+		int fd;
+
+		if (!strcmp(arg, "-")) {
+			errs |= apply_patch(state, 0, "<stdin>", options);
+			read_stdin = 0;
+			continue;
+		} else if (0 < state->prefix_length)
+			arg = prefix_filename(state->prefix,
+					      state->prefix_length,
+					      arg);
+
+		fd = open(arg, O_RDONLY);
+		if (fd < 0)
+			die_errno(_("can't open patch '%s'"), arg);
+		read_stdin = 0;
+		set_default_whitespace_mode(state);
+		errs |= apply_patch(state, fd, arg, options);
+		close(fd);
+	}
+	set_default_whitespace_mode(state);
+	if (read_stdin)
+		errs |= apply_patch(state, 0, "<stdin>", options);
+
+	if (state->whitespace_error) {
+		if (state->squelch_whitespace_errors &&
+		    state->squelch_whitespace_errors < state->whitespace_error) {
+			int squelched =
+				state->whitespace_error - state->squelch_whitespace_errors;
+			warning(Q_("squelched %d whitespace error",
+				   "squelched %d whitespace errors",
+				   squelched),
+				squelched);
+		}
+		if (state->ws_error_action == die_on_ws_error)
+			die(Q_("%d line adds whitespace errors.",
+			       "%d lines add whitespace errors.",
+			       state->whitespace_error),
+			    state->whitespace_error);
+		if (state->applied_after_fixing_ws && state->apply)
+			warning("%d line%s applied after"
+				" fixing whitespace errors.",
+				state->applied_after_fixing_ws,
+				state->applied_after_fixing_ws == 1 ? "" : "s");
+		else if (state->whitespace_error)
+			warning(Q_("%d line adds whitespace errors.",
+				   "%d lines add whitespace errors.",
+				   state->whitespace_error),
+				state->whitespace_error);
+	}
+
+	if (state->update_index) {
+		if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
+			die(_("Unable to write new index file"));
+	}
+
+	return !!errs;
+}
+
+int cmd_apply(int argc, const char **argv, const char *prefix)
+{
 	int force_apply = 0;
 	int options = 0;
-	int read_stdin = 1;
+	int ret;
 	struct apply_state state;
 
 	struct option builtin_apply_options[] = {
@@ -4792,63 +4859,9 @@ int cmd_apply(int argc, const char **argv, const char *prefix)
 
 	check_apply_state(&state, force_apply);
 
-	for (i = 0; i < argc; i++) {
+	ret = apply_all_patches(&state, argc, argv, options);
-		const char *arg = argv[i];
-		int fd;
-
-		if (!strcmp(arg, "-")) {
-			errs |= apply_patch(&state, 0, "<stdin>", options);
-			read_stdin = 0;
-			continue;
-		} else if (0 < state.prefix_length)
-			arg = prefix_filename(state.prefix,
-					      state.prefix_length,
-					      arg);
-
-		fd = open(arg, O_RDONLY);
-		if (fd < 0)
-			die_errno(_("can't open patch '%s'"), arg);
-		read_stdin = 0;
-		set_default_whitespace_mode(&state);
-		errs |= apply_patch(&state, fd, arg, options);
-		close(fd);
-	}
-	set_default_whitespace_mode(&state);
-	if (read_stdin)
-		errs |= apply_patch(&state, 0, "<stdin>", options);
-	if (state.whitespace_error) {
-		if (state.squelch_whitespace_errors &&
-		    state.squelch_whitespace_errors < state.whitespace_error) {
-			int squelched =
-				state.whitespace_error - state.squelch_whitespace_errors;
-			warning(Q_("squelched %d whitespace error",
-				   "squelched %d whitespace errors",
-				   squelched),
-				squelched);
-		}
-		if (state.ws_error_action == die_on_ws_error)
-			die(Q_("%d line adds whitespace errors.",
-			       "%d lines add whitespace errors.",
-			       state.whitespace_error),
-			    state.whitespace_error);
-		if (state.applied_after_fixing_ws && state.apply)
-			warning("%d line%s applied after"
-				" fixing whitespace errors.",
-				state.applied_after_fixing_ws,
-				state.applied_after_fixing_ws == 1 ? "" : "s");
-		else if (state.whitespace_error)
-			warning(Q_("%d line adds whitespace errors.",
-				   "%d lines add whitespace errors.",
-				   state.whitespace_error),
-				state.whitespace_error);
-	}
-
-	if (state.update_index) {
-		if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
-			die(_("Unable to write new index file"));
-	}
 
 	clear_apply_state(&state);
 
-	return !!errs;
+	return ret;
 }