completion: use __gitcomp_builtin for format-patch
[gitweb.git] / diff.c
diff --git a/diff.c b/diff.c
index 136d44b45560d5c9db7e88a1ff22aa6b086108e8..96833c8e81b5d6a7babb523c7ceec0e22ccdab33 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -13,6 +13,7 @@
 #include "attr.h"
 #include "run-command.h"
 #include "utf8.h"
+#include "object-store.h"
 #include "userdiff.h"
 #include "submodule-config.h"
 #include "submodule.h"
@@ -22,6 +23,7 @@
 #include "argv-array.h"
 #include "graph.h"
 #include "packfile.h"
+#include "help.h"
 
 #ifdef NO_FAST_WORKING_DIRECTORY
 #define FAST_WORKING_DIRECTORY 0
@@ -35,6 +37,7 @@ static int diff_rename_limit_default = 400;
 static int diff_suppress_blank_empty;
 static int diff_use_color_default = -1;
 static int diff_color_moved_default;
+static int diff_color_moved_ws_default;
 static int diff_context_default = 3;
 static int diff_interhunk_context_default;
 static const char *diff_word_regex_cfg;
@@ -67,6 +70,37 @@ static char diff_colors[][COLOR_MAXLEN] = {
        GIT_COLOR_BOLD_YELLOW,  /* NEW_MOVED ALTERNATIVE */
        GIT_COLOR_FAINT,        /* NEW_MOVED_DIM */
        GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
+       GIT_COLOR_FAINT,        /* CONTEXT_DIM */
+       GIT_COLOR_FAINT_RED,    /* OLD_DIM */
+       GIT_COLOR_FAINT_GREEN,  /* NEW_DIM */
+       GIT_COLOR_BOLD,         /* CONTEXT_BOLD */
+       GIT_COLOR_BOLD_RED,     /* OLD_BOLD */
+       GIT_COLOR_BOLD_GREEN,   /* NEW_BOLD */
+};
+
+static const char *color_diff_slots[] = {
+       [DIFF_CONTEXT]                = "context",
+       [DIFF_METAINFO]               = "meta",
+       [DIFF_FRAGINFO]               = "frag",
+       [DIFF_FILE_OLD]               = "old",
+       [DIFF_FILE_NEW]               = "new",
+       [DIFF_COMMIT]                 = "commit",
+       [DIFF_WHITESPACE]             = "whitespace",
+       [DIFF_FUNCINFO]               = "func",
+       [DIFF_FILE_OLD_MOVED]         = "oldMoved",
+       [DIFF_FILE_OLD_MOVED_ALT]     = "oldMovedAlternative",
+       [DIFF_FILE_OLD_MOVED_DIM]     = "oldMovedDimmed",
+       [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
+       [DIFF_FILE_NEW_MOVED]         = "newMoved",
+       [DIFF_FILE_NEW_MOVED_ALT]     = "newMovedAlternative",
+       [DIFF_FILE_NEW_MOVED_DIM]     = "newMovedDimmed",
+       [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
+       [DIFF_CONTEXT_DIM]            = "contextDimmed",
+       [DIFF_FILE_OLD_DIM]           = "oldDimmed",
+       [DIFF_FILE_NEW_DIM]           = "newDimmed",
+       [DIFF_CONTEXT_BOLD]           = "contextBold",
+       [DIFF_FILE_OLD_BOLD]          = "oldBold",
+       [DIFF_FILE_NEW_BOLD]          = "newBold",
 };
 
 static NORETURN void die_want_option(const char *option_name)
@@ -74,41 +108,13 @@ static NORETURN void die_want_option(const char *option_name)
        die(_("option '%s' requires a value"), option_name);
 }
 
+define_list_config_array_extra(color_diff_slots, {"plain"});
+
 static int parse_diff_color_slot(const char *var)
 {
-       if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
+       if (!strcasecmp(var, "plain"))
                return DIFF_CONTEXT;
-       if (!strcasecmp(var, "meta"))
-               return DIFF_METAINFO;
-       if (!strcasecmp(var, "frag"))
-               return DIFF_FRAGINFO;
-       if (!strcasecmp(var, "old"))
-               return DIFF_FILE_OLD;
-       if (!strcasecmp(var, "new"))
-               return DIFF_FILE_NEW;
-       if (!strcasecmp(var, "commit"))
-               return DIFF_COMMIT;
-       if (!strcasecmp(var, "whitespace"))
-               return DIFF_WHITESPACE;
-       if (!strcasecmp(var, "func"))
-               return DIFF_FUNCINFO;
-       if (!strcasecmp(var, "oldmoved"))
-               return DIFF_FILE_OLD_MOVED;
-       if (!strcasecmp(var, "oldmovedalternative"))
-               return DIFF_FILE_OLD_MOVED_ALT;
-       if (!strcasecmp(var, "oldmoveddimmed"))
-               return DIFF_FILE_OLD_MOVED_DIM;
-       if (!strcasecmp(var, "oldmovedalternativedimmed"))
-               return DIFF_FILE_OLD_MOVED_ALT_DIM;
-       if (!strcasecmp(var, "newmoved"))
-               return DIFF_FILE_NEW_MOVED;
-       if (!strcasecmp(var, "newmovedalternative"))
-               return DIFF_FILE_NEW_MOVED_ALT;
-       if (!strcasecmp(var, "newmoveddimmed"))
-               return DIFF_FILE_NEW_MOVED_DIM;
-       if (!strcasecmp(var, "newmovedalternativedimmed"))
-               return DIFF_FILE_NEW_MOVED_ALT_DIM;
-       return -1;
+       return LOOKUP_CONFIG(color_diff_slots, var);
 }
 
 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
@@ -271,14 +277,54 @@ static int parse_color_moved(const char *arg)
                return COLOR_MOVED_NO;
        else if (!strcmp(arg, "plain"))
                return COLOR_MOVED_PLAIN;
+       else if (!strcmp(arg, "blocks"))
+               return COLOR_MOVED_BLOCKS;
        else if (!strcmp(arg, "zebra"))
                return COLOR_MOVED_ZEBRA;
        else if (!strcmp(arg, "default"))
                return COLOR_MOVED_DEFAULT;
+       else if (!strcmp(arg, "dimmed-zebra"))
+               return COLOR_MOVED_ZEBRA_DIM;
        else if (!strcmp(arg, "dimmed_zebra"))
                return COLOR_MOVED_ZEBRA_DIM;
        else
-               return error(_("color moved setting must be one of 'no', 'default', 'zebra', 'dimmed_zebra', 'plain'"));
+               return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
+}
+
+static int parse_color_moved_ws(const char *arg)
+{
+       int ret = 0;
+       struct string_list l = STRING_LIST_INIT_DUP;
+       struct string_list_item *i;
+
+       string_list_split(&l, arg, ',', -1);
+
+       for_each_string_list_item(i, &l) {
+               struct strbuf sb = STRBUF_INIT;
+               strbuf_addstr(&sb, i->string);
+               strbuf_trim(&sb);
+
+               if (!strcmp(sb.buf, "ignore-space-change"))
+                       ret |= XDF_IGNORE_WHITESPACE_CHANGE;
+               else if (!strcmp(sb.buf, "ignore-space-at-eol"))
+                       ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
+               else if (!strcmp(sb.buf, "ignore-all-space"))
+                       ret |= XDF_IGNORE_WHITESPACE;
+               else if (!strcmp(sb.buf, "allow-indentation-change"))
+                       ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
+               else
+                       error(_("ignoring unknown color-moved-ws mode '%s'"), sb.buf);
+
+               strbuf_release(&sb);
+       }
+
+       if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
+           (ret & XDF_WHITESPACE_FLAGS))
+               die(_("color-moved-ws: allow-indentation-change cannot be combined with other white space modes"));
+
+       string_list_clear(&l, 0);
+
+       return ret;
 }
 
 int git_diff_ui_config(const char *var, const char *value, void *cb)
@@ -294,6 +340,13 @@ int git_diff_ui_config(const char *var, const char *value, void *cb)
                diff_color_moved_default = cm;
                return 0;
        }
+       if (!strcmp(var, "diff.colormovedws")) {
+               int cm = parse_color_moved_ws(value);
+               if (cm < 0)
+                       return -1;
+               diff_color_moved_ws_default = cm;
+               return 0;
+       }
        if (!strcmp(var, "diff.context")) {
                diff_context_default = git_config_int(var, value);
                if (diff_context_default < 0)
@@ -501,14 +554,15 @@ static int count_lines(const char *data, int size)
        return count;
 }
 
-static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
+static int fill_mmfile(struct repository *r, mmfile_t *mf,
+                      struct diff_filespec *one)
 {
        if (!DIFF_FILE_VALID(one)) {
                mf->ptr = (char *)""; /* does not matter */
                mf->size = 0;
                return 0;
        }
-       else if (diff_populate_filespec(one, 0))
+       else if (diff_populate_filespec(r, one, 0))
                return -1;
 
        mf->ptr = one->data;
@@ -517,11 +571,12 @@ static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
 }
 
 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
-static unsigned long diff_filespec_size(struct diff_filespec *one)
+static unsigned long diff_filespec_size(struct repository *r,
+                                       struct diff_filespec *one)
 {
        if (!DIFF_FILE_VALID(one))
                return 0;
-       diff_populate_filespec(one, CHECK_SIZE_ONLY);
+       diff_populate_filespec(r, one, CHECK_SIZE_ONLY);
        return one->size;
 }
 
@@ -570,37 +625,55 @@ static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
        ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
 }
 
-static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
+static void emit_line_0(struct diff_options *o,
+                       const char *set_sign, const char *set, unsigned reverse, const char *reset,
                        int first, const char *line, int len)
 {
        int has_trailing_newline, has_trailing_carriage_return;
-       int nofirst;
+       int needs_reset = 0; /* at the end of the line */
        FILE *file = o->file;
 
        fputs(diff_line_prefix(o), file);
 
-       if (len == 0) {
-               has_trailing_newline = (first == '\n');
-               has_trailing_carriage_return = (!has_trailing_newline &&
-                                               (first == '\r'));
-               nofirst = has_trailing_newline || has_trailing_carriage_return;
-       } else {
-               has_trailing_newline = (len > 0 && line[len-1] == '\n');
-               if (has_trailing_newline)
-                       len--;
-               has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
-               if (has_trailing_carriage_return)
-                       len--;
-               nofirst = 0;
+       has_trailing_newline = (len > 0 && line[len-1] == '\n');
+       if (has_trailing_newline)
+               len--;
+
+       has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
+       if (has_trailing_carriage_return)
+               len--;
+
+       if (!len && !first)
+               goto end_of_line;
+
+       if (reverse && want_color(o->use_color)) {
+               fputs(GIT_COLOR_REVERSE, file);
+               needs_reset = 1;
+       }
+
+       if (set_sign) {
+               fputs(set_sign, file);
+               needs_reset = 1;
        }
 
-       if (len || !nofirst) {
+       if (first)
+               fputc(first, file);
+
+       if (!len)
+               goto end_of_line;
+
+       if (set) {
+               if (set_sign && set != set_sign)
+                       fputs(reset, file);
                fputs(set, file);
-               if (!nofirst)
-                       fputc(first, file);
-               fwrite(line, len, 1, file);
-               fputs(reset, file);
+               needs_reset = 1;
        }
+       fwrite(line, len, 1, file);
+       needs_reset = 1; /* 'line' may contain color codes. */
+
+end_of_line:
+       if (needs_reset)
+               fputs(reset, file);
        if (has_trailing_carriage_return)
                fputc('\r', file);
        if (has_trailing_newline)
@@ -610,7 +683,7 @@ static void emit_line_0(struct diff_options *o, const char *set, const char *res
 static void emit_line(struct diff_options *o, const char *set, const char *reset,
                      const char *line, int len)
 {
-       emit_line_0(o, set, reset, line[0], line+1, len-1);
+       emit_line_0(o, set, NULL, 0, reset, 0, line, len);
 }
 
 enum diff_symbol {
@@ -707,14 +780,126 @@ struct moved_entry {
        struct moved_entry *next_line;
 };
 
-static int moved_entry_cmp(const struct diff_options *diffopt,
-                          const struct moved_entry *a,
-                          const struct moved_entry *b,
+/**
+ * The struct ws_delta holds white space differences between moved lines, i.e.
+ * between '+' and '-' lines that have been detected to be a move.
+ * The string contains the difference in leading white spaces, before the
+ * rest of the line is compared using the white space config for move
+ * coloring. The current_longer indicates if the first string in the
+ * comparision is longer than the second.
+ */
+struct ws_delta {
+       char *string;
+       unsigned int current_longer : 1;
+};
+#define WS_DELTA_INIT { NULL, 0 }
+
+struct moved_block {
+       struct moved_entry *match;
+       struct ws_delta wsd;
+};
+
+static void moved_block_clear(struct moved_block *b)
+{
+       FREE_AND_NULL(b->wsd.string);
+       b->match = NULL;
+}
+
+static int compute_ws_delta(const struct emitted_diff_symbol *a,
+                            const struct emitted_diff_symbol *b,
+                            struct ws_delta *out)
+{
+       const struct emitted_diff_symbol *longer =  a->len > b->len ? a : b;
+       const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
+       int d = longer->len - shorter->len;
+
+       if (strncmp(longer->line + d, shorter->line, shorter->len))
+               return 0;
+
+       out->string = xmemdupz(longer->line, d);
+       out->current_longer = (a == longer);
+
+       return 1;
+}
+
+static int cmp_in_block_with_wsd(const struct diff_options *o,
+                                const struct moved_entry *cur,
+                                const struct moved_entry *match,
+                                struct moved_block *pmb,
+                                int n)
+{
+       struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
+       int al = cur->es->len, cl = l->len;
+       const char *a = cur->es->line,
+                  *b = match->es->line,
+                  *c = l->line;
+
+       int wslen;
+
+       /*
+        * We need to check if 'cur' is equal to 'match'.
+        * As those are from the same (+/-) side, we do not need to adjust for
+        * indent changes. However these were found using fuzzy matching
+        * so we do have to check if they are equal.
+        */
+       if (strcmp(a, b))
+               return 1;
+
+       if (!pmb->wsd.string)
+               /*
+                * The white space delta is not active? This can happen
+                * when we exit early in this function.
+                */
+               return 1;
+
+       /*
+        * The indent changes of the block are known and stored in
+        * pmb->wsd; however we need to check if the indent changes of the
+        * current line are still the same as before.
+        *
+        * To do so we need to compare 'l' to 'cur', adjusting the
+        * one of them for the white spaces, depending which was longer.
+        */
+
+       wslen = strlen(pmb->wsd.string);
+       if (pmb->wsd.current_longer) {
+               c += wslen;
+               cl -= wslen;
+       } else {
+               a += wslen;
+               al -= wslen;
+       }
+
+       if (al != cl || memcmp(a, c, al))
+               return 1;
+
+       return 0;
+}
+
+static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
+                          const void *entry,
+                          const void *entry_or_key,
                           const void *keydata)
 {
+       const struct diff_options *diffopt = hashmap_cmp_fn_data;
+       const struct moved_entry *a = entry;
+       const struct moved_entry *b = entry_or_key;
+       unsigned flags = diffopt->color_moved_ws_handling
+                        & XDF_WHITESPACE_FLAGS;
+
+       if (diffopt->color_moved_ws_handling &
+           COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
+               /*
+                * As there is not specific white space config given,
+                * we'd need to check for a new block, so ignore all
+                * white space. The setup of the white space
+                * configuration for the next block is done else where
+                */
+               flags |= XDF_IGNORE_WHITESPACE;
+
        return !xdiff_compare_lines(a->es->line, a->es->len,
                                    b->es->line, b->es->len,
-                                   diffopt->xdl_opts);
+                                   flags);
 }
 
 static struct moved_entry *prepare_entry(struct diff_options *o,
@@ -722,8 +907,9 @@ static struct moved_entry *prepare_entry(struct diff_options *o,
 {
        struct moved_entry *ret = xmalloc(sizeof(*ret));
        struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
+       unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
 
-       ret->ent.hash = xdiff_hash_string(l->line, l->len, o->xdl_opts);
+       ret->ent.hash = xdiff_hash_string(l->line, l->len, flags);
        ret->es = l;
        ret->next_line = NULL;
 
@@ -762,24 +948,77 @@ static void add_lines_to_move_detection(struct diff_options *o,
        }
 }
 
-static int shrink_potential_moved_blocks(struct moved_entry **pmb,
+static void pmb_advance_or_null(struct diff_options *o,
+                               struct moved_entry *match,
+                               struct hashmap *hm,
+                               struct moved_block *pmb,
+                               int pmb_nr)
+{
+       int i;
+       for (i = 0; i < pmb_nr; i++) {
+               struct moved_entry *prev = pmb[i].match;
+               struct moved_entry *cur = (prev && prev->next_line) ?
+                               prev->next_line : NULL;
+               if (cur && !hm->cmpfn(o, cur, match, NULL)) {
+                       pmb[i].match = cur;
+               } else {
+                       pmb[i].match = NULL;
+               }
+       }
+}
+
+static void pmb_advance_or_null_multi_match(struct diff_options *o,
+                                           struct moved_entry *match,
+                                           struct hashmap *hm,
+                                           struct moved_block *pmb,
+                                           int pmb_nr, int n)
+{
+       int i;
+       char *got_match = xcalloc(1, pmb_nr);
+
+       for (; match; match = hashmap_get_next(hm, match)) {
+               for (i = 0; i < pmb_nr; i++) {
+                       struct moved_entry *prev = pmb[i].match;
+                       struct moved_entry *cur = (prev && prev->next_line) ?
+                                       prev->next_line : NULL;
+                       if (!cur)
+                               continue;
+                       if (!cmp_in_block_with_wsd(o, cur, match, &pmb[i], n))
+                               got_match[i] |= 1;
+               }
+       }
+
+       for (i = 0; i < pmb_nr; i++) {
+               if (got_match[i]) {
+                       /* Advance to the next line */
+                       pmb[i].match = pmb[i].match->next_line;
+               } else {
+                       moved_block_clear(&pmb[i]);
+               }
+       }
+
+       free(got_match);
+}
+
+static int shrink_potential_moved_blocks(struct moved_block *pmb,
                                         int pmb_nr)
 {
        int lp, rp;
 
        /* Shrink the set of potential block to the remaining running */
        for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
-               while (lp < pmb_nr && pmb[lp])
+               while (lp < pmb_nr && pmb[lp].match)
                        lp++;
                /* lp points at the first NULL now */
 
-               while (rp > -1 && !pmb[rp])
+               while (rp > -1 && !pmb[rp].match)
                        rp--;
                /* rp points at the last non-NULL */
 
                if (lp < pmb_nr && rp > -1 && lp < rp) {
                        pmb[lp] = pmb[rp];
-                       pmb[rp] = NULL;
+                       pmb[rp].match = NULL;
+                       pmb[rp].wsd.string = NULL;
                        rp--;
                        lp++;
                }
@@ -826,7 +1065,7 @@ static void mark_color_as_moved(struct diff_options *o,
                                struct hashmap *add_lines,
                                struct hashmap *del_lines)
 {
-       struct moved_entry **pmb = NULL; /* potentially moved blocks */
+       struct moved_block *pmb = NULL; /* potentially moved blocks */
        int pmb_nr = 0, pmb_alloc = 0;
        int n, flipped_block = 1, block_length = 0;
 
@@ -836,19 +1075,18 @@ static void mark_color_as_moved(struct diff_options *o,
                struct moved_entry *key;
                struct moved_entry *match = NULL;
                struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
-               int i;
 
                switch (l->s) {
                case DIFF_SYMBOL_PLUS:
                        hm = del_lines;
                        key = prepare_entry(o, n);
-                       match = hashmap_get(hm, key, o);
+                       match = hashmap_get(hm, key, NULL);
                        free(key);
                        break;
                case DIFF_SYMBOL_MINUS:
                        hm = add_lines;
                        key = prepare_entry(o, n);
-                       match = hashmap_get(hm, key, o);
+                       match = hashmap_get(hm, key, NULL);
                        free(key);
                        break;
                default:
@@ -856,7 +1094,11 @@ static void mark_color_as_moved(struct diff_options *o,
                }
 
                if (!match) {
+                       int i;
+
                        adjust_last_block(o, n, block_length);
+                       for(i = 0; i < pmb_nr; i++)
+                               moved_block_clear(&pmb[i]);
                        pmb_nr = 0;
                        block_length = 0;
                        continue;
@@ -867,17 +1109,11 @@ static void mark_color_as_moved(struct diff_options *o,
                if (o->color_moved == COLOR_MOVED_PLAIN)
                        continue;
 
-               /* Check any potential block runs, advance each or nullify */
-               for (i = 0; i < pmb_nr; i++) {
-                       struct moved_entry *p = pmb[i];
-                       struct moved_entry *pnext = (p && p->next_line) ?
-                                       p->next_line : NULL;
-                       if (pnext && !hm->cmpfn(o, pnext, match, NULL)) {
-                               pmb[i] = p->next_line;
-                       } else {
-                               pmb[i] = NULL;
-                       }
-               }
+               if (o->color_moved_ws_handling &
+                   COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
+                       pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
+               else
+                       pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
 
                pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
 
@@ -888,7 +1124,15 @@ static void mark_color_as_moved(struct diff_options *o,
                         */
                        for (; match; match = hashmap_get_next(hm, match)) {
                                ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
-                               pmb[pmb_nr++] = match;
+                               if (o->color_moved_ws_handling &
+                                   COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
+                                       if (compute_ws_delta(l, match->es,
+                                                            &pmb[pmb_nr].wsd))
+                                               pmb[pmb_nr++].match = match;
+                               } else {
+                                       pmb[pmb_nr].wsd.string = NULL;
+                                       pmb[pmb_nr++].match = match;
+                               }
                        }
 
                        flipped_block = (flipped_block + 1) % 2;
@@ -899,11 +1143,13 @@ static void mark_color_as_moved(struct diff_options *o,
 
                block_length++;
 
-               if (flipped_block)
+               if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
                        l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
        }
        adjust_last_block(o, n, block_length);
 
+       for(n = 0; n < pmb_nr; n++)
+               moved_block_clear(&pmb[n]);
        free(pmb);
 }
 
@@ -969,8 +1215,9 @@ static void dim_moved_lines(struct diff_options *o)
 }
 
 static void emit_line_ws_markup(struct diff_options *o,
-                               const char *set, const char *reset,
-                               const char *line, int len, char sign,
+                               const char *set_sign, const char *set,
+                               const char *reset,
+                               char sign, const char *line, int len,
                                unsigned ws_rule, int blank_at_eof)
 {
        const char *ws = NULL;
@@ -981,14 +1228,17 @@ static void emit_line_ws_markup(struct diff_options *o,
                        ws = NULL;
        }
 
-       if (!ws)
-               emit_line_0(o, set, reset, sign, line, len);
-       else if (blank_at_eof)
+       if (!ws && !set_sign)
+               emit_line_0(o, set, NULL, 0, reset, sign, line, len);
+       else if (!ws) {
+               emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
+       } else if (blank_at_eof)
                /* Blank line at EOF - paint '+' as well */
-               emit_line_0(o, ws, reset, sign, line, len);
+               emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
        else {
                /* Emit just the prefix, then the rest. */
-               emit_line_0(o, set, reset, sign, "", 0);
+               emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
+                           sign, "", 0);
                ws_check_emit(line, len, ws_rule,
                              o->file, set, reset, ws);
        }
@@ -998,7 +1248,7 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
                                         struct emitted_diff_symbol *eds)
 {
        static const char *nneof = " No newline at end of file\n";
-       const char *context, *reset, *set, *meta, *fraginfo;
+       const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
        struct strbuf sb = STRBUF_INIT;
 
        enum diff_symbol s = eds->s;
@@ -1011,7 +1261,7 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
                context = diff_get_color_opt(o, DIFF_CONTEXT);
                reset = diff_get_color_opt(o, DIFF_RESET);
                putc('\n', o->file);
-               emit_line_0(o, context, reset, '\\',
+               emit_line_0(o, context, NULL, 0, reset, '\\',
                            nneof, strlen(nneof));
                break;
        case DIFF_SYMBOL_SUBMODULE_HEADER:
@@ -1038,7 +1288,20 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
        case DIFF_SYMBOL_CONTEXT:
                set = diff_get_color_opt(o, DIFF_CONTEXT);
                reset = diff_get_color_opt(o, DIFF_RESET);
-               emit_line_ws_markup(o, set, reset, line, len, ' ',
+               set_sign = NULL;
+               if (o->flags.dual_color_diffed_diffs) {
+                       char c = !len ? 0 : line[0];
+
+                       if (c == '+')
+                               set = diff_get_color_opt(o, DIFF_FILE_NEW);
+                       else if (c == '@')
+                               set = diff_get_color_opt(o, DIFF_FRAGINFO);
+                       else if (c == '-')
+                               set = diff_get_color_opt(o, DIFF_FILE_OLD);
+               }
+               emit_line_ws_markup(o, set_sign, set, reset,
+                                   o->output_indicators[OUTPUT_INDICATOR_CONTEXT],
+                                   line, len,
                                    flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
                break;
        case DIFF_SYMBOL_PLUS:
@@ -1065,7 +1328,25 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
                        set = diff_get_color_opt(o, DIFF_FILE_NEW);
                }
                reset = diff_get_color_opt(o, DIFF_RESET);
-               emit_line_ws_markup(o, set, reset, line, len, '+',
+               if (!o->flags.dual_color_diffed_diffs)
+                       set_sign = NULL;
+               else {
+                       char c = !len ? 0 : line[0];
+
+                       set_sign = set;
+                       if (c == '-')
+                               set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
+                       else if (c == '@')
+                               set = diff_get_color_opt(o, DIFF_FRAGINFO);
+                       else if (c == '+')
+                               set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
+                       else
+                               set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
+                       flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
+               }
+               emit_line_ws_markup(o, set_sign, set, reset,
+                                   o->output_indicators[OUTPUT_INDICATOR_NEW],
+                                   line, len,
                                    flags & DIFF_SYMBOL_CONTENT_WS_MASK,
                                    flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
                break;
@@ -1093,7 +1374,24 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
                        set = diff_get_color_opt(o, DIFF_FILE_OLD);
                }
                reset = diff_get_color_opt(o, DIFF_RESET);
-               emit_line_ws_markup(o, set, reset, line, len, '-',
+               if (!o->flags.dual_color_diffed_diffs)
+                       set_sign = NULL;
+               else {
+                       char c = !len ? 0 : line[0];
+
+                       set_sign = set;
+                       if (c == '+')
+                               set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
+                       else if (c == '@')
+                               set = diff_get_color_opt(o, DIFF_FRAGINFO);
+                       else if (c == '-')
+                               set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
+                       else
+                               set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
+               }
+               emit_line_ws_markup(o, set_sign, set, reset,
+                                   o->output_indicators[OUTPUT_INDICATOR_OLD],
+                                   line, len,
                                    flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
                break;
        case DIFF_SYMBOL_WORDS_PORCELAIN:
@@ -1284,6 +1582,7 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
        const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
        const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
        const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
+       const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
        static const char atat[2] = { '@', '@' };
        const char *cp, *ep;
        struct strbuf msgbuf = STRBUF_INIT;
@@ -1304,6 +1603,8 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
        ep += 2; /* skip over @@ */
 
        /* The hunk header in fraginfo color */
+       if (ecbdata->opt->flags.dual_color_diffed_diffs)
+               strbuf_addstr(&msgbuf, reverse);
        strbuf_addstr(&msgbuf, frag);
        strbuf_add(&msgbuf, line, ep - line);
        strbuf_addstr(&msgbuf, reset);
@@ -1428,12 +1729,12 @@ static void emit_rewrite_diff(const char *name_a,
        quote_two_c_style(&a_name, a_prefix, name_a, 0);
        quote_two_c_style(&b_name, b_prefix, name_b, 0);
 
-       size_one = fill_textconv(textconv_one, one, &data_one);
-       size_two = fill_textconv(textconv_two, two, &data_two);
+       size_one = fill_textconv(o->repo, textconv_one, one, &data_one);
+       size_two = fill_textconv(o->repo, textconv_two, two, &data_two);
 
        memset(&ecbdata, 0, sizeof(ecbdata));
        ecbdata.color_diff = want_color(o->use_color);
-       ecbdata.ws_rule = whitespace_rule(name_b);
+       ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
        ecbdata.opt = o;
        if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
                mmfile_t mf1, mf2;
@@ -1821,23 +2122,25 @@ static void diff_words_flush(struct emit_callback *ecbdata)
        }
 }
 
-static void diff_filespec_load_driver(struct diff_filespec *one)
+static void diff_filespec_load_driver(struct diff_filespec *one,
+                                     struct index_state *istate)
 {
        /* Use already-loaded driver */
        if (one->driver)
                return;
 
        if (S_ISREG(one->mode))
-               one->driver = userdiff_find_by_path(one->path);
+               one->driver = userdiff_find_by_path(istate, one->path);
 
        /* Fallback to default settings */
        if (!one->driver)
                one->driver = userdiff_find_by_name("default");
 }
 
-static const char *userdiff_word_regex(struct diff_filespec *one)
+static const char *userdiff_word_regex(struct diff_filespec *one,
+                                      struct index_state *istate)
 {
-       diff_filespec_load_driver(one);
+       diff_filespec_load_driver(one, istate);
        return one->driver->word_regex;
 }
 
@@ -1860,9 +2163,9 @@ static void init_diff_words_data(struct emit_callback *ecbdata,
                        xcalloc(1, sizeof(struct emitted_diff_symbols));
 
        if (!o->word_regex)
-               o->word_regex = userdiff_word_regex(one);
+               o->word_regex = userdiff_word_regex(one, o->repo->index);
        if (!o->word_regex)
-               o->word_regex = userdiff_word_regex(two);
+               o->word_regex = userdiff_word_regex(two, o->repo->index);
        if (!o->word_regex)
                o->word_regex = diff_word_regex_cfg;
        if (o->word_regex) {
@@ -1871,8 +2174,8 @@ static void init_diff_words_data(struct emit_callback *ecbdata,
                if (regcomp(ecbdata->diff_words->word_regex,
                            o->word_regex,
                            REG_EXTENDED | REG_NEWLINE))
-                       die ("Invalid regular expression: %s",
-                            o->word_regex);
+                       die("invalid regular expression: %s",
+                           o->word_regex);
        }
        for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
                if (o->word_diff == diff_words_styles[i].type) {
@@ -2663,16 +2966,11 @@ static void show_dirstat(struct diff_options *options)
                struct diff_filepair *p = q->queue[i];
                const char *name;
                unsigned long copied, added, damage;
-               int content_changed;
 
                name = p->two->path ? p->two->path : p->one->path;
 
-               if (p->one->oid_valid && p->two->oid_valid)
-                       content_changed = oidcmp(&p->one->oid, &p->two->oid);
-               else
-                       content_changed = 1;
-
-               if (!content_changed) {
+               if (p->one->oid_valid && p->two->oid_valid &&
+                   oideq(&p->one->oid, &p->two->oid)) {
                        /*
                         * The SHA1 has not changed, so pre-/post-content is
                         * identical. We can therefore skip looking at the
@@ -2695,18 +2993,19 @@ static void show_dirstat(struct diff_options *options)
                }
 
                if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
-                       diff_populate_filespec(p->one, 0);
-                       diff_populate_filespec(p->two, 0);
-                       diffcore_count_changes(p->one, p->two, NULL, NULL,
+                       diff_populate_filespec(options->repo, p->one, 0);
+                       diff_populate_filespec(options->repo, p->two, 0);
+                       diffcore_count_changes(options->repo,
+                                              p->one, p->two, NULL, NULL,
                                               &copied, &added);
                        diff_free_filespec_data(p->one);
                        diff_free_filespec_data(p->two);
                } else if (DIFF_FILE_VALID(p->one)) {
-                       diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
+                       diff_populate_filespec(options->repo, p->one, CHECK_SIZE_ONLY);
                        copied = added = 0;
                        diff_free_filespec_data(p->one);
                } else if (DIFF_FILE_VALID(p->two)) {
-                       diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
+                       diff_populate_filespec(options->repo, p->two, CHECK_SIZE_ONLY);
                        copied = 0;
                        added = p->two->size;
                        diff_free_filespec_data(p->two);
@@ -2719,7 +3018,7 @@ static void show_dirstat(struct diff_options *options)
                 * made to the preimage.
                 * If the resulting damage is zero, we know that
                 * diffcore_count_changes() considers the two entries to
-                * be identical, but since content_changed is true, we
+                * be identical, but since the oid changed, we
                 * know that there must have been _some_ kind of change,
                 * so we force all entries to have damage > 0.
                 */
@@ -2980,15 +3279,16 @@ static void emit_binary_diff(struct diff_options *o,
        emit_binary_diff_body(o, two, one);
 }
 
-int diff_filespec_is_binary(struct diff_filespec *one)
+int diff_filespec_is_binary(struct repository *r,
+                           struct diff_filespec *one)
 {
        if (one->is_binary == -1) {
-               diff_filespec_load_driver(one);
+               diff_filespec_load_driver(one, r->index);
                if (one->driver->binary != -1)
                        one->is_binary = one->driver->binary;
                else {
                        if (!one->data && DIFF_FILE_VALID(one))
-                               diff_populate_filespec(one, CHECK_BINARY);
+                               diff_populate_filespec(r, one, CHECK_BINARY);
                        if (one->is_binary == -1 && one->data)
                                one->is_binary = buffer_is_binary(one->data,
                                                one->size);
@@ -2999,9 +3299,10 @@ int diff_filespec_is_binary(struct diff_filespec *one)
        return one->is_binary;
 }
 
-static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
+static const struct userdiff_funcname *
+diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
 {
-       diff_filespec_load_driver(one);
+       diff_filespec_load_driver(one, o->repo->index);
        return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
 }
 
@@ -3013,12 +3314,13 @@ void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const
                options->b_prefix = b;
 }
 
-struct userdiff_driver *get_textconv(struct diff_filespec *one)
+struct userdiff_driver *get_textconv(struct index_state *istate,
+                                    struct diff_filespec *one)
 {
        if (!DIFF_FILE_VALID(one))
                return NULL;
 
-       diff_filespec_load_driver(one);
+       diff_filespec_load_driver(one, istate);
        return userdiff_get_textconv(one->driver);
 }
 
@@ -3068,8 +3370,8 @@ static void builtin_diff(const char *name_a,
        }
 
        if (o->flags.allow_textconv) {
-               textconv_one = get_textconv(one);
-               textconv_two = get_textconv(two);
+               textconv_one = get_textconv(o->repo->index, one);
+               textconv_two = get_textconv(o->repo->index, two);
        }
 
        /* Never use a non-valid filename anywhere if at all possible */
@@ -3110,13 +3412,13 @@ static void builtin_diff(const char *name_a,
                if ((one->mode ^ two->mode) & S_IFMT)
                        goto free_ab_and_return;
                if (complete_rewrite &&
-                   (textconv_one || !diff_filespec_is_binary(one)) &&
-                   (textconv_two || !diff_filespec_is_binary(two))) {
+                   (textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
+                   (textconv_two || !diff_filespec_is_binary(o->repo, two))) {
                        emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
                                         header.buf, header.len, 0);
                        strbuf_reset(&header);
                        emit_rewrite_diff(name_a, name_b, one, two,
-                                               textconv_one, textconv_two, o);
+                                         textconv_one, textconv_two, o);
                        o->found_changes = 1;
                        goto free_ab_and_return;
                }
@@ -3128,13 +3430,13 @@ static void builtin_diff(const char *name_a,
                strbuf_reset(&header);
                goto free_ab_and_return;
        } else if (!o->flags.text &&
-           ( (!textconv_one && diff_filespec_is_binary(one)) ||
-             (!textconv_two && diff_filespec_is_binary(two)) )) {
+                  ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
+                    (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
                struct strbuf sb = STRBUF_INIT;
                if (!one->data && !two->data &&
                    S_ISREG(one->mode) && S_ISREG(two->mode) &&
                    !o->flags.binary) {
-                       if (!oidcmp(&one->oid, &two->oid)) {
+                       if (oideq(&one->oid, &two->oid)) {
                                if (must_show_header)
                                        emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
                                                         header.buf, header.len,
@@ -3150,7 +3452,8 @@ static void builtin_diff(const char *name_a,
                        strbuf_release(&sb);
                        goto free_ab_and_return;
                }
-               if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
+               if (fill_mmfile(o->repo, &mf1, one) < 0 ||
+                   fill_mmfile(o->repo, &mf2, two) < 0)
                        die("unable to read files to diff");
                /* Quite common confusing case */
                if (mf1.size == mf2.size &&
@@ -3187,23 +3490,26 @@ static void builtin_diff(const char *name_a,
                        strbuf_reset(&header);
                }
 
-               mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
-               mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
+               mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
+               mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
 
-               pe = diff_funcname_pattern(one);
+               pe = diff_funcname_pattern(o, one);
                if (!pe)
-                       pe = diff_funcname_pattern(two);
+                       pe = diff_funcname_pattern(o, two);
 
                memset(&xpp, 0, sizeof(xpp));
                memset(&xecfg, 0, sizeof(xecfg));
                memset(&ecbdata, 0, sizeof(ecbdata));
+               if (o->flags.suppress_diff_headers)
+                       lbl[0] = NULL;
                ecbdata.label_path = lbl;
                ecbdata.color_diff = want_color(o->use_color);
-               ecbdata.ws_rule = whitespace_rule(name_b);
+               ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
                if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
                        check_blank_at_eof(&mf1, &mf2, &ecbdata);
                ecbdata.opt = o;
-               ecbdata.header = header.len ? &header : NULL;
+               if (header.len && !o->flags.suppress_diff_headers)
+                       ecbdata.header = &header;
                xpp.flags = o->xdl_opts;
                xpp.anchors = o->anchors;
                xpp.anchors_nr = o->anchors_nr;
@@ -3296,22 +3602,23 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
                return;
        }
 
-       same_contents = !oidcmp(&one->oid, &two->oid);
+       same_contents = oideq(&one->oid, &two->oid);
 
-       if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
+       if (diff_filespec_is_binary(o->repo, one) ||
+           diff_filespec_is_binary(o->repo, two)) {
                data->is_binary = 1;
                if (same_contents) {
                        data->added = 0;
                        data->deleted = 0;
                } else {
-                       data->added = diff_filespec_size(two);
-                       data->deleted = diff_filespec_size(one);
+                       data->added = diff_filespec_size(o->repo, two);
+                       data->deleted = diff_filespec_size(o->repo, one);
                }
        }
 
        else if (complete_rewrite) {
-               diff_populate_filespec(one, 0);
-               diff_populate_filespec(two, 0);
+               diff_populate_filespec(o->repo, one, 0);
+               diff_populate_filespec(o->repo, two, 0);
                data->deleted = count_lines(one->data, one->size);
                data->added = count_lines(two->data, two->size);
        }
@@ -3321,7 +3628,8 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
                xpparam_t xpp;
                xdemitconf_t xecfg;
 
-               if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
+               if (fill_mmfile(o->repo, &mf1, one) < 0 ||
+                   fill_mmfile(o->repo, &mf2, two) < 0)
                        die("unable to read files to diff");
 
                memset(&xpp, 0, sizeof(xpp));
@@ -3356,10 +3664,11 @@ static void builtin_checkdiff(const char *name_a, const char *name_b,
        data.filename = name_b ? name_b : name_a;
        data.lineno = 0;
        data.o = o;
-       data.ws_rule = whitespace_rule(attr_path);
-       data.conflict_marker_size = ll_merge_marker_size(attr_path);
+       data.ws_rule = whitespace_rule(o->repo->index, attr_path);
+       data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
 
-       if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
+       if (fill_mmfile(o->repo, &mf1, one) < 0 ||
+           fill_mmfile(o->repo, &mf2, two) < 0)
                die("unable to read files to diff");
 
        /*
@@ -3368,7 +3677,7 @@ static void builtin_checkdiff(const char *name_a, const char *name_b,
         * introduced changes, and as long as the "new" side is text, we
         * can and should check what it introduces.
         */
-       if (diff_filespec_is_binary(two))
+       if (diff_filespec_is_binary(o->repo, two))
                goto free_and_return;
        else {
                /* Crazy xdl interfaces.. */
@@ -3441,7 +3750,10 @@ void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
  * the work tree has that object contents, return true, so that
  * prepare_temp_file() does not have to inflate and extract.
  */
-static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file)
+static int reuse_worktree_file(struct index_state *istate,
+                              const char *name,
+                              const struct object_id *oid,
+                              int want_file)
 {
        const struct cache_entry *ce;
        struct stat st;
@@ -3460,7 +3772,7 @@ static int reuse_worktree_file(const char *name, const struct object_id *oid, in
         * by diff-cache --cached, which does read the cache before
         * calling us.
         */
-       if (!active_cache)
+       if (!istate->cache)
                return 0;
 
        /* We want to avoid the working directory if our caller
@@ -3479,20 +3791,20 @@ static int reuse_worktree_file(const char *name, const struct object_id *oid, in
         * Similarly, if we'd have to convert the file contents anyway, that
         * makes the optimization not worthwhile.
         */
-       if (!want_file && would_convert_to_git(&the_index, name))
+       if (!want_file && would_convert_to_git(istate, name))
                return 0;
 
        len = strlen(name);
-       pos = cache_name_pos(name, len);
+       pos = index_name_pos(istate, name, len);
        if (pos < 0)
                return 0;
-       ce = active_cache[pos];
+       ce = istate->cache[pos];
 
        /*
         * This is not the sha1 we are looking for, or
         * unreusable because it is not a regular file.
         */
-       if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
+       if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
                return 0;
 
        /*
@@ -3506,7 +3818,7 @@ static int reuse_worktree_file(const char *name, const struct object_id *oid, in
         * If ce matches the file in the work tree, we can reuse it.
         */
        if (ce_uptodate(ce) ||
-           (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
+           (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
                return 1;
 
        return 0;
@@ -3539,7 +3851,9 @@ static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
  * grab the data for the blob (or file) for our own in-core comparison.
  * diff_filespec has data and size fields for this purpose.
  */
-int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
+int diff_populate_filespec(struct repository *r,
+                          struct diff_filespec *s,
+                          unsigned int flags)
 {
        int size_only = flags & CHECK_SIZE_ONLY;
        int err = 0;
@@ -3566,7 +3880,7 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
                return diff_populate_gitlink(s, size_only);
 
        if (!s->oid_valid ||
-           reuse_worktree_file(s->path, &s->oid, 0)) {
+           reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
                struct strbuf buf = STRBUF_INIT;
                struct stat st;
                int fd;
@@ -3599,7 +3913,7 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
                 * point if the path requires us to run the content
                 * conversion.
                 */
-               if (size_only && !would_convert_to_git(&the_index, s->path))
+               if (size_only && !would_convert_to_git(r->index, s->path))
                        return 0;
 
                /*
@@ -3626,7 +3940,7 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
                /*
                 * Convert from working tree format to canonical git format
                 */
-               if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, conv_flags)) {
+               if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
                        size_t size = 0;
                        munmap(s->data, s->size);
                        s->should_munmap = 0;
@@ -3638,8 +3952,7 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
        else {
                enum object_type type;
                if (size_only || (flags & CHECK_BINARY)) {
-                       type = oid_object_info(the_repository, &s->oid,
-                                              &s->size);
+                       type = oid_object_info(r, &s->oid, &s->size);
                        if (type < 0)
                                die("unable to read %s",
                                    oid_to_hex(&s->oid));
@@ -3677,7 +3990,8 @@ void diff_free_filespec_data(struct diff_filespec *s)
        FREE_AND_NULL(s->cnt_data);
 }
 
-static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
+static void prep_temp_blob(struct index_state *istate,
+                          const char *path, struct diff_tempfile *temp,
                           void *blob,
                           unsigned long size,
                           const struct object_id *oid,
@@ -3695,7 +4009,7 @@ static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
        temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
        if (!temp->tempfile)
                die_errno("unable to create temp-file");
-       if (convert_to_working_tree(path,
+       if (convert_to_working_tree(istate, path,
                        (const char *)blob, (size_t)size, &buf)) {
                blob = buf.buf;
                size = buf.len;
@@ -3711,8 +4025,9 @@ static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
        free(path_dup);
 }
 
-static struct diff_tempfile *prepare_temp_file(const char *name,
-               struct diff_filespec *one)
+static struct diff_tempfile *prepare_temp_file(struct repository *r,
+                                              const char *name,
+                                              struct diff_filespec *one)
 {
        struct diff_tempfile *temp = claim_diff_tempfile();
 
@@ -3729,7 +4044,7 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
 
        if (!S_ISGITLINK(one->mode) &&
            (!one->oid_valid ||
-            reuse_worktree_file(name, &one->oid, 1))) {
+            reuse_worktree_file(r->index, name, &one->oid, 1))) {
                struct stat st;
                if (lstat(name, &st) < 0) {
                        if (errno == ENOENT)
@@ -3740,7 +4055,7 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
                        struct strbuf sb = STRBUF_INIT;
                        if (strbuf_readlink(&sb, name, st.st_size) < 0)
                                die_errno("readlink(%s)", name);
-                       prep_temp_blob(name, temp, sb.buf, sb.len,
+                       prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
                                       (one->oid_valid ?
                                        &one->oid : &null_oid),
                                       (one->oid_valid ?
@@ -3765,19 +4080,21 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
                return temp;
        }
        else {
-               if (diff_populate_filespec(one, 0))
+               if (diff_populate_filespec(r, one, 0))
                        die("cannot read data blob for %s", one->path);
-               prep_temp_blob(name, temp, one->data, one->size,
+               prep_temp_blob(r->index, name, temp,
+                              one->data, one->size,
                               &one->oid, one->mode);
        }
        return temp;
 }
 
-static void add_external_diff_name(struct argv_array *argv,
+static void add_external_diff_name(struct repository *r,
+                                  struct argv_array *argv,
                                   const char *name,
                                   struct diff_filespec *df)
 {
-       struct diff_tempfile *temp = prepare_temp_file(name, df);
+       struct diff_tempfile *temp = prepare_temp_file(r, name, df);
        argv_array_push(argv, temp->name);
        argv_array_push(argv, temp->hex);
        argv_array_push(argv, temp->mode);
@@ -3806,11 +4123,11 @@ static void run_external_diff(const char *pgm,
        argv_array_push(&argv, name);
 
        if (one && two) {
-               add_external_diff_name(&argv, name, one);
+               add_external_diff_name(o->repo, &argv, name, one);
                if (!other)
-                       add_external_diff_name(&argv, name, two);
+                       add_external_diff_name(o->repo, &argv, name, two);
                else {
-                       add_external_diff_name(&argv, other, two);
+                       add_external_diff_name(o->repo, &argv, other, two);
                        argv_array_push(&argv, other);
                        argv_array_push(&argv, xfrm_msg);
                }
@@ -3840,7 +4157,7 @@ static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
                char *hex = oid_to_hex(oid);
                if (abbrev < 0)
                        abbrev = FALLBACK_DEFAULT_ABBREV;
-               if (abbrev > GIT_SHA1_HEXSZ)
+               if (abbrev > the_hash_algo->hexsz)
                        BUG("oid abbreviation out of range: %d", abbrev);
                if (abbrev)
                        hex[abbrev] = '\0';
@@ -3897,14 +4214,16 @@ static void fill_metainfo(struct strbuf *msg,
        default:
                *must_show_header = 0;
        }
-       if (one && two && oidcmp(&one->oid, &two->oid)) {
+       if (one && two && !oideq(&one->oid, &two->oid)) {
                const unsigned hexsz = the_hash_algo->hexsz;
                int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
 
                if (o->flags.binary) {
                        mmfile_t mf;
-                       if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
-                           (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
+                       if ((!fill_mmfile(o->repo, &mf, one) &&
+                            diff_filespec_is_binary(o->repo, one)) ||
+                           (!fill_mmfile(o->repo, &mf, two) &&
+                            diff_filespec_is_binary(o->repo, two)))
                                abbrev = hexsz;
                }
                strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
@@ -3932,7 +4251,9 @@ static void run_diff_cmd(const char *pgm,
 
 
        if (o->flags.allow_external) {
-               struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
+               struct userdiff_driver *drv;
+
+               drv = userdiff_find_by_path(o->repo->index, attr_path);
                if (drv && drv->external)
                        pgm = drv->external;
        }
@@ -3961,7 +4282,7 @@ static void run_diff_cmd(const char *pgm,
                fprintf(o->file, "* Unmerged path %s\n", name);
 }
 
-static void diff_fill_oid_info(struct diff_filespec *one)
+static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
 {
        if (DIFF_FILE_VALID(one)) {
                if (!one->oid_valid) {
@@ -3972,7 +4293,7 @@ static void diff_fill_oid_info(struct diff_filespec *one)
                        }
                        if (lstat(one->path, &st) < 0)
                                die_errno("stat '%s'", one->path);
-                       if (index_path(&one->oid, one->path, &st, 0))
+                       if (index_path(istate, &one->oid, one->path, &st, 0))
                                die("cannot hash %s", one->path);
                }
        }
@@ -4020,8 +4341,8 @@ static void run_diff(struct diff_filepair *p, struct diff_options *o)
                return;
        }
 
-       diff_fill_oid_info(one);
-       diff_fill_oid_info(two);
+       diff_fill_oid_info(one, o->repo->index);
+       diff_fill_oid_info(two, o->repo->index);
 
        if (!pgm &&
            DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
@@ -4032,7 +4353,8 @@ static void run_diff(struct diff_filepair *p, struct diff_options *o)
                 */
                struct diff_filespec *null = alloc_filespec(two->path);
                run_diff_cmd(NULL, name, other, attr_path,
-                            one, null, &msg, o, p);
+                            one, null, &msg,
+                            o, p);
                free(null);
                strbuf_release(&msg);
 
@@ -4056,7 +4378,8 @@ static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
 
        if (DIFF_PAIR_UNMERGED(p)) {
                /* unmerged */
-               builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
+               builtin_diffstat(p->one->path, NULL, NULL, NULL,
+                                diffstat, o, p);
                return;
        }
 
@@ -4066,10 +4389,11 @@ static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
        if (o->prefix_length)
                strip_prefix(o->prefix_length, &name, &other);
 
-       diff_fill_oid_info(p->one);
-       diff_fill_oid_info(p->two);
+       diff_fill_oid_info(p->one, o->repo->index);
+       diff_fill_oid_info(p->two, o->repo->index);
 
-       builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
+       builtin_diffstat(name, other, p->one, p->two,
+                        diffstat, o, p);
 }
 
 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
@@ -4090,18 +4414,22 @@ static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
        if (o->prefix_length)
                strip_prefix(o->prefix_length, &name, &other);
 
-       diff_fill_oid_info(p->one);
-       diff_fill_oid_info(p->two);
+       diff_fill_oid_info(p->one, o->repo->index);
+       diff_fill_oid_info(p->two, o->repo->index);
 
        builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
 }
 
-void diff_setup(struct diff_options *options)
+void repo_diff_setup(struct repository *r, struct diff_options *options)
 {
        memcpy(options, &default_diff_options, sizeof(*options));
 
        options->file = stdout;
+       options->repo = r;
 
+       options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
+       options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
+       options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
        options->abbrev = DEFAULT_ABBREV;
        options->line_termination = '\n';
        options->break_opt = -1;
@@ -4132,6 +4460,7 @@ void diff_setup(struct diff_options *options)
        }
 
        options->color_moved = diff_color_moved_default;
+       options->color_moved_ws_handling = diff_color_moved_ws_default;
 }
 
 void diff_setup_done(struct diff_options *options)
@@ -4215,16 +4544,6 @@ void diff_setup_done(struct diff_options *options)
 
        if (options->detect_rename && options->rename_limit < 0)
                options->rename_limit = diff_rename_limit_default;
-       if (options->setup & DIFF_SETUP_USE_CACHE) {
-               if (!active_cache)
-                       /* read-cache does not die even when it fails
-                        * so it is safe for us to do this here.  Also
-                        * it does not smudge active_cache or active_nr
-                        * when it fails, so we do not have to worry about
-                        * cleaning it up ourselves either.
-                        */
-                       read_cache();
-       }
        if (hexsz < options->abbrev)
                options->abbrev = hexsz; /* full */
 
@@ -4588,6 +4907,12 @@ int diff_opt_parse(struct diff_options *options,
                 options->output_format |= DIFF_FORMAT_DIFFSTAT;
        } else if (!strcmp(arg, "--no-compact-summary"))
                 options->flags.stat_with_summary = 0;
+       else if (skip_prefix(arg, "--output-indicator-new=", &arg))
+               options->output_indicators[OUTPUT_INDICATOR_NEW] = arg[0];
+       else if (skip_prefix(arg, "--output-indicator-old=", &arg))
+               options->output_indicators[OUTPUT_INDICATOR_OLD] = arg[0];
+       else if (skip_prefix(arg, "--output-indicator-context=", &arg))
+               options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = arg[0];
 
        /* renames options */
        else if (starts_with(arg, "-B") ||
@@ -4711,6 +5036,8 @@ int diff_opt_parse(struct diff_options *options,
                if (cm < 0)
                        die("bad --color-moved argument: %s", arg);
                options->color_moved = cm;
+       } else if (skip_prefix(arg, "--color-moved-ws=", &arg)) {
+               options->color_moved_ws_handling = parse_color_moved_ws(arg);
        } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
                options->use_color = 1;
                options->word_diff = DIFF_WORDS_COLOR;
@@ -4955,7 +5282,7 @@ const char *diff_aligned_abbrev(const struct object_id *oid, int len)
        const char *abbrev;
 
        /* Do we want all 40 hex characters? */
-       if (len == GIT_SHA1_HEXSZ)
+       if (len == the_hash_algo->hexsz)
                return oid_to_hex(oid);
 
        /* An abbreviated value is fine, possibly followed by an ellipsis. */
@@ -4985,7 +5312,7 @@ const char *diff_aligned_abbrev(const struct object_id *oid, int len)
         * the automatic sizing is supposed to give abblen that ensures
         * uniqueness across all objects (statistically speaking).
         */
-       if (abblen < GIT_SHA1_HEXSZ - 3) {
+       if (abblen < the_hash_algo->hexsz - 3) {
                static char hex[GIT_MAX_HEXSZ + 1];
                if (len < abblen && abblen <= len + 2)
                        xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
@@ -5057,7 +5384,7 @@ int diff_unmodified_pair(struct diff_filepair *p)
         * dealing with a change.
         */
        if (one->oid_valid && two->oid_valid &&
-           !oidcmp(&one->oid, &two->oid) &&
+           oideq(&one->oid, &two->oid) &&
            !one->dirty_submodule && !two->dirty_submodule)
                return 1; /* no change */
        if (!one->oid_valid && !two->oid_valid)
@@ -5191,7 +5518,7 @@ static void diff_resolve_rename_copy(void)
                        else
                                p->status = DIFF_STATUS_RENAMED;
                }
-               else if (oidcmp(&p->one->oid, &p->two->oid) ||
+               else if (!oideq(&p->one->oid, &p->two->oid) ||
                         p->one->mode != p->two->mode ||
                         p->one->dirty_submodule ||
                         p->two->dirty_submodule ||
@@ -5397,8 +5724,8 @@ static int diff_get_patch_id(struct diff_options *options, struct object_id *oid
                if (DIFF_PAIR_UNMERGED(p))
                        continue;
 
-               diff_fill_oid_info(p->one);
-               diff_fill_oid_info(p->two);
+               diff_fill_oid_info(p->one, options->repo->index);
+               diff_fill_oid_info(p->two, options->repo->index);
 
                len1 = remove_space(p->one->path, strlen(p->one->path));
                len2 = remove_space(p->two->path, strlen(p->two->path));
@@ -5430,12 +5757,12 @@ static int diff_get_patch_id(struct diff_options *options, struct object_id *oid
                if (diff_header_only)
                        continue;
 
-               if (fill_mmfile(&mf1, p->one) < 0 ||
-                   fill_mmfile(&mf2, p->two) < 0)
+               if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
+                   fill_mmfile(options->repo, &mf2, p->two) < 0)
                        return error("unable to read files to diff");
 
-               if (diff_filespec_is_binary(p->one) ||
-                   diff_filespec_is_binary(p->two)) {
+               if (diff_filespec_is_binary(options->repo, p->one) ||
+                   diff_filespec_is_binary(options->repo, p->two)) {
                        git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
                                        GIT_SHA1_HEXSZ);
                        git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
@@ -5541,18 +5868,20 @@ static void diff_flush_patch_all_file_pairs(struct diff_options *o)
                if (o->color_moved) {
                        struct hashmap add_lines, del_lines;
 
-                       hashmap_init(&del_lines,
-                                    (hashmap_cmp_fn)moved_entry_cmp, o, 0);
-                       hashmap_init(&add_lines,
-                                    (hashmap_cmp_fn)moved_entry_cmp, o, 0);
+                       if (o->color_moved_ws_handling &
+                           COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
+                               o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
+
+                       hashmap_init(&del_lines, moved_entry_cmp, o, 0);
+                       hashmap_init(&add_lines, moved_entry_cmp, o, 0);
 
                        add_lines_to_move_detection(o, &add_lines, &del_lines);
                        mark_color_as_moved(o, &add_lines, &del_lines);
                        if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
                                dim_moved_lines(o);
 
-                       hashmap_free(&add_lines, 0);
-                       hashmap_free(&del_lines, 0);
+                       hashmap_free(&add_lines, 1);
+                       hashmap_free(&del_lines, 1);
                }
 
                for (i = 0; i < esm.nr; i++)
@@ -5736,19 +6065,21 @@ static void diffcore_apply_filter(struct diff_options *options)
 }
 
 /* Check whether two filespecs with the same mode and size are identical */
-static int diff_filespec_is_identical(struct diff_filespec *one,
+static int diff_filespec_is_identical(struct repository *r,
+                                     struct diff_filespec *one,
                                      struct diff_filespec *two)
 {
        if (S_ISGITLINK(one->mode))
                return 0;
-       if (diff_populate_filespec(one, 0))
+       if (diff_populate_filespec(r, one, 0))
                return 0;
-       if (diff_populate_filespec(two, 0))
+       if (diff_populate_filespec(r, two, 0))
                return 0;
        return !memcmp(one->data, two->data, one->size);
 }
 
-static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
+static int diff_filespec_check_stat_unmatch(struct repository *r,
+                                           struct diff_filepair *p)
 {
        if (p->done_skip_stat_unmatch)
                return p->skip_stat_unmatch_result;
@@ -5772,10 +6103,10 @@ static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
            !DIFF_FILE_VALID(p->two) ||
            (p->one->oid_valid && p->two->oid_valid) ||
            (p->one->mode != p->two->mode) ||
-           diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
-           diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
+           diff_populate_filespec(r, p->one, CHECK_SIZE_ONLY) ||
+           diff_populate_filespec(r, p->two, CHECK_SIZE_ONLY) ||
            (p->one->size != p->two->size) ||
-           !diff_filespec_is_identical(p->one, p->two)) /* (2) */
+           !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
                p->skip_stat_unmatch_result = 1;
        return p->skip_stat_unmatch_result;
 }
@@ -5790,7 +6121,7 @@ static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p = q->queue[i];
 
-               if (diff_filespec_check_stat_unmatch(p))
+               if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
                        diff_q(&outq, p);
                else {
                        /*
@@ -5832,7 +6163,8 @@ void diffcore_std(struct diff_options *options)
        if (!options->found_follow) {
                /* See try_to_follow_renames() in tree-diff.c */
                if (options->break_opt != -1)
-                       diffcore_break(options->break_opt);
+                       diffcore_break(options->repo,
+                                      options->break_opt);
                if (options->detect_rename)
                        diffcore_rename(options);
                if (options->break_opt != -1)
@@ -5983,7 +6315,7 @@ void diff_change(struct diff_options *options,
                return;
 
        if (options->flags.quick && options->skip_stat_unmatch &&
-           !diff_filespec_check_stat_unmatch(p))
+           !diff_filespec_check_stat_unmatch(options->repo, p))
                return;
 
        options->flags.has_changes = 1;
@@ -6005,8 +6337,10 @@ struct diff_filepair *diff_unmerge(struct diff_options *options, const char *pat
        return pair;
 }
 
-static char *run_textconv(const char *pgm, struct diff_filespec *spec,
-               size_t *outsize)
+static char *run_textconv(struct repository *r,
+                         const char *pgm,
+                         struct diff_filespec *spec,
+                         size_t *outsize)
 {
        struct diff_tempfile *temp;
        const char *argv[3];
@@ -6015,7 +6349,7 @@ static char *run_textconv(const char *pgm, struct diff_filespec *spec,
        struct strbuf buf = STRBUF_INIT;
        int err = 0;
 
-       temp = prepare_temp_file(spec->path, spec);
+       temp = prepare_temp_file(r, spec->path, spec);
        *arg++ = pgm;
        *arg++ = temp->name;
        *arg = NULL;
@@ -6042,7 +6376,8 @@ static char *run_textconv(const char *pgm, struct diff_filespec *spec,
        return strbuf_detach(&buf, outsize);
 }
 
-size_t fill_textconv(struct userdiff_driver *driver,
+size_t fill_textconv(struct repository *r,
+                    struct userdiff_driver *driver,
                     struct diff_filespec *df,
                     char **outbuf)
 {
@@ -6053,7 +6388,7 @@ size_t fill_textconv(struct userdiff_driver *driver,
                        *outbuf = "";
                        return 0;
                }
-               if (diff_populate_filespec(df, 0))
+               if (diff_populate_filespec(r, df, 0))
                        die("unable to read files to diff");
                *outbuf = df->data;
                return df->size;
@@ -6070,7 +6405,7 @@ size_t fill_textconv(struct userdiff_driver *driver,
                        return size;
        }
 
-       *outbuf = run_textconv(driver->textconv, df, &size);
+       *outbuf = run_textconv(r, driver->textconv, df, &size);
        if (!*outbuf)
                die("unable to read files to diff");
 
@@ -6090,7 +6425,8 @@ size_t fill_textconv(struct userdiff_driver *driver,
        return size;
 }
 
-int textconv_object(const char *path,
+int textconv_object(struct repository *r,
+                   const char *path,
                    unsigned mode,
                    const struct object_id *oid,
                    int oid_valid,
@@ -6102,13 +6438,13 @@ int textconv_object(const char *path,
 
        df = alloc_filespec(path);
        fill_filespec(df, oid, oid_valid, mode);
-       textconv = get_textconv(df);
+       textconv = get_textconv(r->index, df);
        if (!textconv) {
                free_filespec(df);
                return 0;
        }
 
-       *buf_size = fill_textconv(textconv, df, buf);
+       *buf_size = fill_textconv(r, textconv, df, buf);
        free_filespec(df);
        return 1;
 }