1 files changed, 202 insertions, 108 deletions

diff --git a/diff.c b/diff.c
index 8c78fce..58cb72d 100644
--- a/diff.c
+++ b/diff.c
@@ -18,6 +18,7 @@
 #include "ll-merge.h"
 #include "string-list.h"
 #include "argv-array.h"
+#include "graph.h"
 
 #ifdef NO_FAST_WORKING_DIRECTORY
 #define FAST_WORKING_DIRECTORY 0
@@ -26,11 +27,12 @@
 #endif
 
 static int diff_detect_rename_default;
-static int diff_compaction_heuristic; /* experimental */
+static int diff_indent_heuristic; /* experimental */
 static int diff_rename_limit_default = 400;
 static int diff_suppress_blank_empty;
 static int diff_use_color_default = -1;
 static int diff_context_default = 3;
+static int diff_interhunk_context_default;
 static const char *diff_word_regex_cfg;
 static const char *external_diff_cmd_cfg;
 static const char *diff_order_file_cfg;
@@ -41,6 +43,7 @@ static int diff_stat_graph_width;
 static int diff_dirstat_permille_default = 30;
 static struct diff_options default_diff_options;
 static long diff_algorithm;
+static unsigned ws_error_highlight_default = WSEH_NEW;
 
 static char diff_colors[][COLOR_MAXLEN] = {
 	GIT_COLOR_RESET,
@@ -54,6 +57,11 @@ static char diff_colors[][COLOR_MAXLEN] = {
 	GIT_COLOR_NORMAL,	/* FUNCINFO */
 };
 
+static NORETURN void die_want_option(const char *option_name)
+{
+	die(_("option '%s' requires a value"), option_name);
+}
+
 static int parse_diff_color_slot(const char *var)
 {
 	if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
@@ -131,9 +139,11 @@ static int parse_dirstat_params(struct diff_options *options, const char *params
 static int parse_submodule_params(struct diff_options *options, const char *value)
 {
 	if (!strcmp(value, "log"))
-		DIFF_OPT_SET(options, SUBMODULE_LOG);
+		options->submodule_format = DIFF_SUBMODULE_LOG;
 	else if (!strcmp(value, "short"))
-		DIFF_OPT_CLR(options, SUBMODULE_LOG);
+		options->submodule_format = DIFF_SUBMODULE_SHORT;
+	else if (!strcmp(value, "diff"))
+		options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
 	else
 		return -1;
 	return 0;
@@ -163,6 +173,43 @@ long parse_algorithm_value(const char *value)
 	return -1;
 }
 
+static int parse_one_token(const char **arg, const char *token)
+{
+	const char *rest;
+	if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
+		*arg = rest;
+		return 1;
+	}
+	return 0;
+}
+
+static int parse_ws_error_highlight(const char *arg)
+{
+	const char *orig_arg = arg;
+	unsigned val = 0;
+
+	while (*arg) {
+		if (parse_one_token(&arg, "none"))
+			val = 0;
+		else if (parse_one_token(&arg, "default"))
+			val = WSEH_NEW;
+		else if (parse_one_token(&arg, "all"))
+			val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
+		else if (parse_one_token(&arg, "new"))
+			val |= WSEH_NEW;
+		else if (parse_one_token(&arg, "old"))
+			val |= WSEH_OLD;
+		else if (parse_one_token(&arg, "context"))
+			val |= WSEH_CONTEXT;
+		else {
+			return -1 - (int)(arg - orig_arg);
+		}
+		if (*arg)
+			arg++;
+	}
+	return val;
+}
+
 /*
  * These are to give UI layer defaults.
  * The core-level commands such as git-diff-files should
@@ -174,6 +221,13 @@ void init_diff_ui_defaults(void)
 	diff_detect_rename_default = 1;
 }
 
+int git_diff_heuristic_config(const char *var, const char *value, void *cb)
+{
+	if (!strcmp(var, "diff.indentheuristic"))
+		diff_indent_heuristic = git_config_bool(var, value);
+	return 0;
+}
+
 int git_diff_ui_config(const char *var, const char *value, void *cb)
 {
 	if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
@@ -186,12 +240,14 @@ int git_diff_ui_config(const char *var, const char *value, void *cb)
 			return -1;
 		return 0;
 	}
-	if (!strcmp(var, "diff.renames")) {
-		diff_detect_rename_default = git_config_rename(var, value);
+	if (!strcmp(var, "diff.interhunkcontext")) {
+		diff_interhunk_context_default = git_config_int(var, value);
+		if (diff_interhunk_context_default < 0)
+			return -1;
 		return 0;
 	}
-	if (!strcmp(var, "diff.compactionheuristic")) {
-		diff_compaction_heuristic = git_config_bool(var, value);
+	if (!strcmp(var, "diff.renames")) {
+		diff_detect_rename_default = git_config_rename(var, value);
 		return 0;
 	}
 	if (!strcmp(var, "diff.autorefreshindex")) {
@@ -234,6 +290,17 @@ int git_diff_ui_config(const char *var, const char *value, void *cb)
 		return 0;
 	}
 
+	if (git_diff_heuristic_config(var, value, cb) < 0)
+		return -1;
+
+	if (!strcmp(var, "diff.wserrorhighlight")) {
+		int val = parse_ws_error_highlight(value);
+		if (val < 0)
+			return -1;
+		ws_error_highlight_default = val;
+		return 0;
+	}
+
 	if (git_color_config(var, value, cb) < 0)
 		return -1;
 
@@ -1616,7 +1683,7 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options)
 	 */
 
 	if (options->stat_width == -1)
-		width = term_columns() - options->output_prefix_length;
+		width = term_columns() - strlen(line_prefix);
 	else
 		width = options->stat_width ? options->stat_width : 80;
 	number_width = decimal_width(max_change) > number_width ?
@@ -1997,7 +2064,7 @@ found_damage:
 		return;
 
 	/* Show all directories with more than x% of the changes */
-	qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
+	QSORT(dir.files, dir.nr, dirstat_compare);
 	gather_dirstat(options, &dir, changed, "", 0);
 }
 
@@ -2041,7 +2108,7 @@ static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *o
 		return;
 
 	/* Show all directories with more than x% of the changes */
-	qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
+	QSORT(dir.files, dir.nr, dirstat_compare);
 	gather_dirstat(options, &dir, changed, "", 0);
 }
 
@@ -2290,17 +2357,37 @@ static void builtin_diff(const char *name_a,
 	struct strbuf header = STRBUF_INIT;
 	const char *line_prefix = diff_line_prefix(o);
 
-	if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
-			(!one->mode || S_ISGITLINK(one->mode)) &&
-			(!two->mode || S_ISGITLINK(two->mode))) {
+	diff_set_mnemonic_prefix(o, "a/", "b/");
+	if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
+		a_prefix = o->b_prefix;
+		b_prefix = o->a_prefix;
+	} else {
+		a_prefix = o->a_prefix;
+		b_prefix = o->b_prefix;
+	}
+
+	if (o->submodule_format == DIFF_SUBMODULE_LOG &&
+	    (!one->mode || S_ISGITLINK(one->mode)) &&
+	    (!two->mode || S_ISGITLINK(two->mode))) {
 		const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
 		const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
 		show_submodule_summary(o->file, one->path ? one->path : two->path,
 				line_prefix,
-				one->oid.hash, two->oid.hash,
+				&one->oid, &two->oid,
 				two->dirty_submodule,
 				meta, del, add, reset);
 		return;
+	} else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
+		   (!one->mode || S_ISGITLINK(one->mode)) &&
+		   (!two->mode || S_ISGITLINK(two->mode))) {
+		const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
+		const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
+		show_submodule_inline_diff(o->file, one->path ? one->path : two->path,
+				line_prefix,
+				&one->oid, &two->oid,
+				two->dirty_submodule,
+				meta, del, add, reset, o);
+		return;
 	}
 
 	if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
@@ -2308,15 +2395,6 @@ static void builtin_diff(const char *name_a,
 		textconv_two = get_textconv(two);
 	}
 
-	diff_set_mnemonic_prefix(o, "a/", "b/");
-	if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
-		a_prefix = o->b_prefix;
-		b_prefix = o->a_prefix;
-	} else {
-		a_prefix = o->a_prefix;
-		b_prefix = o->b_prefix;
-	}
-
 	/* Never use a non-valid filename anywhere if at all possible */
 	name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
 	name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
@@ -2690,7 +2768,7 @@ static int reuse_worktree_file(const char *name, const unsigned char *sha1, int
 	 * This is not the sha1 we are looking for, or
 	 * unreusable because it is not a regular file.
 	 */
-	if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
+	if (hashcmp(sha1, ce->oid.hash) || !S_ISREG(ce->ce_mode))
 		return 0;
 
 	/*
@@ -2792,8 +2870,25 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
 			s->should_free = 1;
 			return 0;
 		}
-		if (size_only)
+
+		/*
+		 * Even if the caller would be happy with getting
+		 * only the size, we cannot return early at this
+		 * point if the path requires us to run the content
+		 * conversion.
+		 */
+		if (size_only && !would_convert_to_git(s->path))
 			return 0;
+
+		/*
+		 * Note: this check uses xsize_t(st.st_size) that may
+		 * not be the true size of the blob after it goes
+		 * through convert_to_git().  This may not strictly be
+		 * correct, but the whole point of big_file_threshold
+		 * and is_binary check being that we want to avoid
+		 * opening the file and inspecting the contents, this
+		 * is probably fine.
+		 */
 		if ((flags & CHECK_BINARY) &&
 		    s->size > big_file_threshold && s->is_binary == -1) {
 			s->is_binary = 1;
@@ -2937,7 +3032,7 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
 			if (!one->oid_valid)
 				sha1_to_hex_r(temp->hex, null_sha1);
 			else
-				sha1_to_hex_r(temp->hex, one->oid.hash);
+				oid_to_hex_r(temp->hex, &one->oid);
 			/* Even though we may sometimes borrow the
 			 * contents from the work tree, we always want
 			 * one->mode.  mode is trustworthy even when
@@ -3016,6 +3111,22 @@ static int similarity_index(struct diff_filepair *p)
 	return p->score * 100 / MAX_SCORE;
 }
 
+static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
+{
+	if (startup_info->have_repository)
+		return find_unique_abbrev(oid->hash, abbrev);
+	else {
+		char *hex = oid_to_hex(oid);
+		if (abbrev < 0)
+			abbrev = FALLBACK_DEFAULT_ABBREV;
+		if (abbrev > GIT_SHA1_HEXSZ)
+			die("BUG: oid abbreviation out of range: %d", abbrev);
+		if (abbrev)
+			hex[abbrev] = '\0';
+		return hex;
+	}
+}
+
 static void fill_metainfo(struct strbuf *msg,
 			  const char *name,
 			  const char *other,
@@ -3074,9 +3185,9 @@ static void fill_metainfo(struct strbuf *msg,
 			    (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
 				abbrev = 40;
 		}
-		strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
-			    find_unique_abbrev(one->oid.hash, abbrev));
-		strbuf_add_unique_abbrev(msg, two->oid.hash, abbrev);
+		strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
+			    diff_abbrev_oid(&one->oid, abbrev),
+			    diff_abbrev_oid(&two->oid, abbrev));
 		if (one->mode == two->mode)
 			strbuf_addf(msg, " %06o", one->mode);
 		strbuf_addf(msg, "%s\n", reset);
@@ -3269,12 +3380,14 @@ void diff_setup(struct diff_options *options)
 
 	options->file = stdout;
 
+	options->abbrev = DEFAULT_ABBREV;
 	options->line_termination = '\n';
 	options->break_opt = -1;
 	options->rename_limit = -1;
 	options->dirstat_permille = diff_dirstat_permille_default;
 	options->context = diff_context_default;
-	options->ws_error_highlight = WSEH_NEW;
+	options->interhunkcontext = diff_interhunk_context_default;
+	options->ws_error_highlight = ws_error_highlight_default;
 	DIFF_OPT_SET(options, RENAME_EMPTY);
 
 	/* pathchange left =NULL by default */
@@ -3283,8 +3396,8 @@ void diff_setup(struct diff_options *options)
 	options->use_color = diff_use_color_default;
 	options->detect_rename = diff_detect_rename_default;
 	options->xdl_opts |= diff_algorithm;
-	if (diff_compaction_heuristic)
-		DIFF_XDL_SET(options, COMPACTION_HEURISTIC);
+	if (diff_indent_heuristic)
+		DIFF_XDL_SET(options, INDENT_HEURISTIC);
 
 	options->orderfile = diff_order_file_cfg;
 
@@ -3312,7 +3425,7 @@ void diff_setup_done(struct diff_options *options)
 	if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
 		count++;
 	if (count > 1)
-		die("--name-only, --name-status, --check and -s are mutually exclusive");
+		die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
 
 	/*
 	 * Most of the time we can say "there are changes"
@@ -3386,7 +3499,7 @@ void diff_setup_done(struct diff_options *options)
 			 */
 			read_cache();
 	}
-	if (options->abbrev <= 0 || 40 < options->abbrev)
+	if (40 < options->abbrev)
 		options->abbrev = 40; /* full */
 
 	/*
@@ -3508,7 +3621,7 @@ static int stat_opt(struct diff_options *options, const char **av)
 			if (*arg == '=')
 				width = strtoul(arg + 1, &end, 10);
 			else if (!*arg && !av[1])
-				die("Option '--stat-width' requires a value");
+				die_want_option("--stat-width");
 			else if (!*arg) {
 				width = strtoul(av[1], &end, 10);
 				argcount = 2;
@@ -3517,7 +3630,7 @@ static int stat_opt(struct diff_options *options, const char **av)
 			if (*arg == '=')
 				name_width = strtoul(arg + 1, &end, 10);
 			else if (!*arg && !av[1])
-				die("Option '--stat-name-width' requires a value");
+				die_want_option("--stat-name-width");
 			else if (!*arg) {
 				name_width = strtoul(av[1], &end, 10);
 				argcount = 2;
@@ -3526,7 +3639,7 @@ static int stat_opt(struct diff_options *options, const char **av)
 			if (*arg == '=')
 				graph_width = strtoul(arg + 1, &end, 10);
 			else if (!*arg && !av[1])
-				die("Option '--stat-graph-width' requires a value");
+				die_want_option("--stat-graph-width");
 			else if (!*arg) {
 				graph_width = strtoul(av[1], &end, 10);
 				argcount = 2;
@@ -3535,7 +3648,7 @@ static int stat_opt(struct diff_options *options, const char **av)
 			if (*arg == '=')
 				count = strtoul(arg + 1, &end, 10);
 			else if (!*arg && !av[1])
-				die("Option '--stat-count' requires a value");
+				die_want_option("--stat-count");
 			else if (!*arg) {
 				count = strtoul(av[1], &end, 10);
 				argcount = 2;
@@ -3663,40 +3776,14 @@ static void enable_patch_output(int *fmt) {
 	*fmt |= DIFF_FORMAT_PATCH;
 }
 
-static int parse_one_token(const char **arg, const char *token)
+static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
 {
-	const char *rest;
-	if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
-		*arg = rest;
-		return 1;
-	}
-	return 0;
-}
+	int val = parse_ws_error_highlight(arg);
 
-static int parse_ws_error_highlight(struct diff_options *opt, const char *arg)
-{
-	const char *orig_arg = arg;
-	unsigned val = 0;
-	while (*arg) {
-		if (parse_one_token(&arg, "none"))
-			val = 0;
-		else if (parse_one_token(&arg, "default"))
-			val = WSEH_NEW;
-		else if (parse_one_token(&arg, "all"))
-			val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
-		else if (parse_one_token(&arg, "new"))
-			val |= WSEH_NEW;
-		else if (parse_one_token(&arg, "old"))
-			val |= WSEH_OLD;
-		else if (parse_one_token(&arg, "context"))
-			val |= WSEH_CONTEXT;
-		else {
-			error("unknown value after ws-error-highlight=%.*s",
-			      (int)(arg - orig_arg), orig_arg);
-			return 0;
-		}
-		if (*arg)
-			arg++;
+	if (val < 0) {
+		error("unknown value after ws-error-highlight=%.*s",
+		      -1 - val, arg);
+		return 0;
 	}
 	opt->ws_error_highlight = val;
 	return 1;
@@ -3805,10 +3892,10 @@ int diff_opt_parse(struct diff_options *options,
 		DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
 	else if (!strcmp(arg, "--ignore-blank-lines"))
 		DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
-	else if (!strcmp(arg, "--compaction-heuristic"))
-		DIFF_XDL_SET(options, COMPACTION_HEURISTIC);
-	else if (!strcmp(arg, "--no-compaction-heuristic"))
-		DIFF_XDL_CLR(options, COMPACTION_HEURISTIC);
+	else if (!strcmp(arg, "--indent-heuristic"))
+		DIFF_XDL_SET(options, INDENT_HEURISTIC);
+	else if (!strcmp(arg, "--no-indent-heuristic"))
+		DIFF_XDL_CLR(options, INDENT_HEURISTIC);
 	else if (!strcmp(arg, "--patience"))
 		options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
 	else if (!strcmp(arg, "--histogram"))
@@ -3905,11 +3992,15 @@ int diff_opt_parse(struct diff_options *options,
 		DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
 		handle_ignore_submodules_arg(options, arg);
 	} else if (!strcmp(arg, "--submodule"))
-		DIFF_OPT_SET(options, SUBMODULE_LOG);
+		options->submodule_format = DIFF_SUBMODULE_LOG;
 	else if (skip_prefix(arg, "--submodule=", &arg))
 		return parse_submodule_opt(options, arg);
 	else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
-		return parse_ws_error_highlight(options, arg);
+		return parse_ws_error_highlight_opt(options, arg);
+	else if (!strcmp(arg, "--ita-invisible-in-index"))
+		options->ita_invisible_in_index = 1;
+	else if (!strcmp(arg, "--ita-visible-in-index"))
+		options->ita_invisible_in_index = 0;
 
 	/* misc options */
 	else if (!strcmp(arg, "-z"))
@@ -3932,8 +4023,7 @@ int diff_opt_parse(struct diff_options *options,
 	else if (!strcmp(arg, "--pickaxe-regex"))
 		options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
 	else if ((argcount = short_opt('O', av, &optarg))) {
-		const char *path = prefix_filename(prefix, strlen(prefix), optarg);
-		options->orderfile = xstrdup(path);
+		options->orderfile = prefix_filename(prefix, optarg);
 		return argcount;
 	}
 	else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
@@ -3943,6 +4033,8 @@ int diff_opt_parse(struct diff_options *options,
 			    offending, optarg);
 		return argcount;
 	}
+	else if (!strcmp(arg, "--no-abbrev"))
+		options->abbrev = 0;
 	else if (!strcmp(arg, "--abbrev"))
 		options->abbrev = DEFAULT_ABBREV;
 	else if (skip_prefix(arg, "--abbrev=", &arg)) {
@@ -3956,6 +4048,12 @@ int diff_opt_parse(struct diff_options *options,
 		options->a_prefix = optarg;
 		return argcount;
 	}
+	else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
+		options->line_prefix = optarg;
+		options->line_prefix_length = strlen(options->line_prefix);
+		graph_setup_line_prefix(options);
+		return argcount;
+	}
 	else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
 		options->b_prefix = optarg;
 		return argcount;
@@ -3972,13 +4070,14 @@ int diff_opt_parse(struct diff_options *options,
 	else if (!strcmp(arg, "--no-function-context"))
 		DIFF_OPT_CLR(options, FUNCCONTEXT);
 	else if ((argcount = parse_long_opt("output", av, &optarg))) {
-		const char *path = prefix_filename(prefix, strlen(prefix), optarg);
+		char *path = prefix_filename(prefix, optarg);
 		options->file = fopen(path, "w");
 		if (!options->file)
 			die_errno("Could not open '%s'", path);
 		options->close_file = 1;
 		if (options->use_color != GIT_COLOR_ALWAYS)
 			options->use_color = GIT_COLOR_NEVER;
+		free(path);
 		return argcount;
 	} else
 		return 0;
@@ -4089,18 +4188,15 @@ void diff_free_filepair(struct diff_filepair *p)
 	free(p);
 }
 
-/*
- * This is different from find_unique_abbrev() in that
- * it stuffs the result with dots for alignment.
- */
-const char *diff_unique_abbrev(const unsigned char *sha1, int len)
+const char *diff_aligned_abbrev(const struct object_id *oid, int len)
 {
 	int abblen;
 	const char *abbrev;
-	if (len == 40)
-		return sha1_to_hex(sha1);
 
-	abbrev = find_unique_abbrev(sha1, len);
+	if (len == GIT_SHA1_HEXSZ)
+		return oid_to_hex(oid);
+
+	abbrev = diff_abbrev_oid(oid, len);
 	abblen = strlen(abbrev);
 
 	/*
@@ -4122,15 +4218,16 @@ const char *diff_unique_abbrev(const unsigned char *sha1, int len)
 	 * the automatic sizing is supposed to give abblen that ensures
 	 * uniqueness across all objects (statistically speaking).
 	 */
-	if (abblen < 37) {
-		static char hex[41];
+	if (abblen < GIT_SHA1_HEXSZ - 3) {
+		static char hex[GIT_SHA1_HEXSZ + 1];
 		if (len < abblen && abblen <= len + 2)
 			xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
 		else
 			xsnprintf(hex, sizeof(hex), "%s...", abbrev);
 		return hex;
 	}
-	return sha1_to_hex(sha1);
+
+	return oid_to_hex(oid);
 }
 
 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
@@ -4141,9 +4238,9 @@ static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
 	fprintf(opt->file, "%s", diff_line_prefix(opt));
 	if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
 		fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
-			diff_unique_abbrev(p->one->oid.hash, opt->abbrev));
+			diff_aligned_abbrev(&p->one->oid, opt->abbrev));
 		fprintf(opt->file, "%s ",
-			diff_unique_abbrev(p->two->oid.hash, opt->abbrev));
+			diff_aligned_abbrev(&p->two->oid, opt->abbrev));
 	}
 	if (p->score) {
 		fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
@@ -4370,6 +4467,7 @@ static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
 		name_a = p->two->path;
 		name_b = NULL;
 		strip_prefix(opt->prefix_length, &name_a, &name_b);
+		fprintf(opt->file, "%s", diff_line_prefix(opt));
 		write_name_quoted(name_a, opt->file, opt->line_termination);
 	}
 }
@@ -4612,25 +4710,25 @@ static int is_summary_empty(const struct diff_queue_struct *q)
 }
 
 static const char rename_limit_warning[] =
-"inexact rename detection was skipped due to too many files.";
+N_("inexact rename detection was skipped due to too many files.");
 
 static const char degrade_cc_to_c_warning[] =
-"only found copies from modified paths due to too many files.";
+N_("only found copies from modified paths due to too many files.");
 
 static const char rename_limit_advice[] =
-"you may want to set your %s variable to at least "
-"%d and retry the command.";
+N_("you may want to set your %s variable to at least "
+   "%d and retry the command.");
 
 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
 {
 	if (degraded_cc)
-		warning(degrade_cc_to_c_warning);
+		warning(_(degrade_cc_to_c_warning));
 	else if (needed)
-		warning(rename_limit_warning);
+		warning(_(rename_limit_warning));
 	else
 		return;
 	if (0 < needed && needed < 32767)
-		warning(rename_limit_advice, varname, needed);
+		warning(_(rename_limit_advice), varname, needed);
 }
 
 void diff_flush(struct diff_options *options)
@@ -4897,7 +4995,7 @@ static int diffnamecmp(const void *a_, const void *b_)
 void diffcore_fix_diff_index(struct diff_options *options)
 {
 	struct diff_queue_struct *q = &diff_queued_diff;
-	qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
+	QSORT(q->queue, q->nr, diffnamecmp);
 }
 
 void diffcore_std(struct diff_options *options)
@@ -5037,14 +5135,10 @@ void diff_change(struct diff_options *options,
 		return;
 
 	if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
-		unsigned tmp;
-		const unsigned char *tmp_c;
-		tmp = old_mode; old_mode = new_mode; new_mode = tmp;
-		tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
-		tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
-			new_sha1_valid = tmp;
-		tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
-			new_dirty_submodule = tmp;
+		SWAP(old_mode, new_mode);
+		SWAP(old_sha1, new_sha1);
+		SWAP(old_sha1_valid, new_sha1_valid);
+		SWAP(old_dirty_submodule, new_dirty_submodule);
 	}
 
 	if (options->prefix &&