diff options
author | Junio C Hamano <gitster@pobox.com> | 2019-01-29 23:47:53 +0300 |
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committer | Junio C Hamano <gitster@pobox.com> | 2019-01-29 23:47:53 +0300 |
commit | 15b07cba0b60f0fc5dea0be0d68a355a8161476d (patch) | |
tree | 1b007627a61f37546097b66d1681ade4ecb92736 /diff.c | |
parent | 27dc9eb7f9646ae43ddfa7c9c55f64016b9c2182 (diff) | |
parent | 0cd51e9d05e65608126c30fbb65a0cdd197cd570 (diff) |
Merge branch 'pw/diff-color-moved-ws-fix'
"git diff --color-moved-ws" updates.
* pw/diff-color-moved-ws-fix:
diff --color-moved-ws: handle blank lines
diff --color-moved-ws: modify allow-indentation-change
diff --color-moved-ws: optimize allow-indentation-change
diff --color-moved=zebra: be stricter with color alternation
diff --color-moved-ws: fix false positives
diff --color-moved-ws: demonstrate false positives
diff: allow --no-color-moved-ws
Use "whitespace" consistently
diff: document --no-color-moved
Diffstat (limited to 'diff.c')
-rw-r--r-- | diff.c | 221 |
1 files changed, 143 insertions, 78 deletions
@@ -304,7 +304,9 @@ static unsigned parse_color_moved_ws(const char *arg) strbuf_addstr(&sb, i->string); strbuf_trim(&sb); - if (!strcmp(sb.buf, "ignore-space-change")) + if (!strcmp(sb.buf, "no")) + ret = 0; + else 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; @@ -322,7 +324,7 @@ static unsigned parse_color_moved_ws(const char *arg) if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) && (ret & XDF_WHITESPACE_FLAGS)) { - error(_("color-moved-ws: allow-indentation-change cannot be combined with other white space modes")); + error(_("color-moved-ws: allow-indentation-change cannot be combined with other whitespace modes")); ret |= COLOR_MOVED_WS_ERROR; } @@ -754,6 +756,8 @@ struct emitted_diff_symbol { const char *line; int len; int flags; + int indent_off; /* Offset to first non-whitespace character */ + int indent_width; /* The visual width of the indentation */ enum diff_symbol s; }; #define EMITTED_DIFF_SYMBOL_INIT {NULL} @@ -784,44 +788,85 @@ struct moved_entry { struct moved_entry *next_line; }; -/** - * 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; + int wsd; /* The whitespace delta of this block */ }; static void moved_block_clear(struct moved_block *b) { - FREE_AND_NULL(b->wsd.string); - b->match = NULL; + memset(b, 0, sizeof(*b)); } -static int compute_ws_delta(const struct emitted_diff_symbol *a, - const struct emitted_diff_symbol *b, - struct ws_delta *out) +#define INDENT_BLANKLINE INT_MIN + +static void fill_es_indent_data(struct emitted_diff_symbol *es) { - 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; + unsigned int off = 0, i; + int width = 0, tab_width = es->flags & WS_TAB_WIDTH_MASK; + const char *s = es->line; + const int len = es->len; + + /* skip any \v \f \r at start of indentation */ + while (s[off] == '\f' || s[off] == '\v' || + (s[off] == '\r' && off < len - 1)) + off++; + + /* calculate the visual width of indentation */ + while(1) { + if (s[off] == ' ') { + width++; + off++; + } else if (s[off] == '\t') { + width += tab_width - (width % tab_width); + while (s[++off] == '\t') + width += tab_width; + } else { + break; + } + } + + /* check if this line is blank */ + for (i = off; i < len; i++) + if (!isspace(s[i])) + break; - if (strncmp(longer->line + d, shorter->line, shorter->len)) + if (i == len) { + es->indent_width = INDENT_BLANKLINE; + es->indent_off = len; + } else { + es->indent_off = off; + es->indent_width = width; + } +} + +static int compute_ws_delta(const struct emitted_diff_symbol *a, + const struct emitted_diff_symbol *b, + int *out) +{ + int a_len = a->len, + b_len = b->len, + a_off = a->indent_off, + a_width = a->indent_width, + b_off = b->indent_off, + b_width = b->indent_width; + int delta; + + if (a_width == INDENT_BLANKLINE && b_width == INDENT_BLANKLINE) { + *out = INDENT_BLANKLINE; + return 1; + } + + if (a->s == DIFF_SYMBOL_PLUS) + delta = a_width - b_width; + else + delta = b_width - a_width; + + if (a_len - a_off != b_len - b_off || + memcmp(a->line + a_off, b->line + b_off, a_len - a_off)) return 0; - out->string = xmemdupz(longer->line, d); - out->current_longer = (a == longer); + *out = delta; return 1; } @@ -833,51 +878,53 @@ static int cmp_in_block_with_wsd(const struct diff_options *o, int n) { struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n]; - int al = cur->es->len, cl = l->len; + int al = cur->es->len, bl = match->es->len, cl = l->len; const char *a = cur->es->line, *b = match->es->line, *c = l->line; - - int wslen; + int a_off = cur->es->indent_off, + a_width = cur->es->indent_width, + c_off = l->indent_off, + c_width = l->indent_width; + int delta; /* - * 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. + * 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. Here we + * just check the lengths. We delay calling memcmp() to check + * the contents until later as if the length comparison for a + * and c fails we can avoid the call all together. */ - if (strcmp(a, b)) + if (al != bl) 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; + /* If 'l' and 'cur' are both blank then they match. */ + if (a_width == INDENT_BLANKLINE && c_width == INDENT_BLANKLINE) + return 0; /* - * 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. + * 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 + * match those of the current block and that the text of 'l' and 'cur' + * after the indentation match. */ + if (cur->es->s == DIFF_SYMBOL_PLUS) + delta = a_width - c_width; + else + delta = c_width - a_width; - 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; + /* + * If the previous lines of this block were all blank then set its + * whitespace delta. + */ + if (pmb->wsd == INDENT_BLANKLINE) + pmb->wsd = delta; - return 0; + return !(delta == pmb->wsd && al - a_off == cl - c_off && + !memcmp(a, b, al) && ! + memcmp(a + a_off, c + c_off, al - a_off)); } static int moved_entry_cmp(const void *hashmap_cmp_fn_data, @@ -943,6 +990,9 @@ static void add_lines_to_move_detection(struct diff_options *o, continue; } + if (o->color_moved_ws_handling & + COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) + fill_es_indent_data(&o->emitted_symbols->buf[n]); key = prepare_entry(o, n); if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s) prev_line->next_line = key; @@ -1021,8 +1071,7 @@ static int shrink_potential_moved_blocks(struct moved_block *pmb, if (lp < pmb_nr && rp > -1 && lp < rp) { pmb[lp] = pmb[rp]; - pmb[rp].match = NULL; - pmb[rp].wsd.string = NULL; + memset(&pmb[rp], 0, sizeof(pmb[rp])); rp--; lp++; } @@ -1042,14 +1091,17 @@ static int shrink_potential_moved_blocks(struct moved_block *pmb, * The last block consists of the (n - block_length)'th line up to but not * including the nth line. * + * Returns 0 if the last block is empty or is unset by this function, non zero + * otherwise. + * * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c. * Think of a way to unify them. */ -static void adjust_last_block(struct diff_options *o, int n, int block_length) +static int adjust_last_block(struct diff_options *o, int n, int block_length) { int i, alnum_count = 0; if (o->color_moved == COLOR_MOVED_PLAIN) - return; + return block_length; for (i = 1; i < block_length + 1; i++) { const char *c = o->emitted_symbols->buf[n - i].line; for (; *c; c++) { @@ -1057,11 +1109,12 @@ static void adjust_last_block(struct diff_options *o, int n, int block_length) continue; alnum_count++; if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT) - return; + return 1; } } for (i = 1; i < block_length + 1; i++) o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE; + return 0; } /* Find blocks of moved code, delegate actual coloring decision to helper */ @@ -1071,7 +1124,7 @@ static void mark_color_as_moved(struct diff_options *o, { struct moved_block *pmb = NULL; /* potentially moved blocks */ int pmb_nr = 0, pmb_alloc = 0; - int n, flipped_block = 1, block_length = 0; + int n, flipped_block = 0, block_length = 0; for (n = 0; n < o->emitted_symbols->nr; n++) { @@ -1079,6 +1132,7 @@ 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]; + enum diff_symbol last_symbol = 0; switch (l->s) { case DIFF_SYMBOL_PLUS: @@ -1094,7 +1148,7 @@ static void mark_color_as_moved(struct diff_options *o, free(key); break; default: - flipped_block = 1; + flipped_block = 0; } if (!match) { @@ -1105,13 +1159,16 @@ static void mark_color_as_moved(struct diff_options *o, moved_block_clear(&pmb[i]); pmb_nr = 0; block_length = 0; + flipped_block = 0; + last_symbol = l->s; continue; } - l->flags |= DIFF_SYMBOL_MOVED_LINE; - - if (o->color_moved == COLOR_MOVED_PLAIN) + if (o->color_moved == COLOR_MOVED_PLAIN) { + last_symbol = l->s; + l->flags |= DIFF_SYMBOL_MOVED_LINE; continue; + } if (o->color_moved_ws_handling & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) @@ -1134,21 +1191,27 @@ static void mark_color_as_moved(struct diff_options *o, &pmb[pmb_nr].wsd)) pmb[pmb_nr++].match = match; } else { - pmb[pmb_nr].wsd.string = NULL; + pmb[pmb_nr].wsd = 0; pmb[pmb_nr++].match = match; } } - flipped_block = (flipped_block + 1) % 2; + if (adjust_last_block(o, n, block_length) && + pmb_nr && last_symbol != l->s) + flipped_block = (flipped_block + 1) % 2; + else + flipped_block = 0; - adjust_last_block(o, n, block_length); block_length = 0; } - block_length++; - - if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS) - l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT; + if (pmb_nr) { + block_length++; + l->flags |= DIFF_SYMBOL_MOVED_LINE; + if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS) + l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT; + } + last_symbol = l->s; } adjust_last_block(o, n, block_length); @@ -1492,7 +1555,7 @@ static void emit_diff_symbol_from_struct(struct diff_options *o, static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s, const char *line, int len, unsigned flags) { - struct emitted_diff_symbol e = {line, len, flags, s}; + struct emitted_diff_symbol e = {line, len, flags, 0, 0, s}; if (o->emitted_symbols) append_emitted_diff_symbol(o, &e); @@ -5042,6 +5105,8 @@ int diff_opt_parse(struct diff_options *options, if (cm < 0) return error("bad --color-moved argument: %s", arg); options->color_moved = cm; + } else if (!strcmp(arg, "--no-color-moved-ws")) { + options->color_moved_ws_handling = 0; } else if (skip_prefix(arg, "--color-moved-ws=", &arg)) { unsigned cm = parse_color_moved_ws(arg); if (cm & COLOR_MOVED_WS_ERROR) |