From 0cd51e9d05e65608126c30fbb65a0cdd197cd570 Mon Sep 17 00:00:00 2001 From: Phillip Wood Date: Fri, 23 Nov 2018 11:16:58 +0000 Subject: [PATCH] diff --color-moved-ws: handle blank lines When using --color-moved-ws=allow-indentation-change allow lines with the same indentation change to be grouped across blank lines. For now this only works if the blank lines have been moved as well, not for blocks that have just had their indentation changed. This completes the changes to the implementation of --color-moved=allow-indentation-change. Running git diff --color-moved=allow-indentation-change v2.18.0 v2.19.0 now takes 5.0s. This is a saving of 41% from 8.5s for the optimized version of the previous implementation and 66% from the original which took 14.6s. Signed-off-by: Phillip Wood Reviewed-by: Stefan Beller Signed-off-by: Junio C Hamano --- diff.c | 34 ++++++++++++++++++++++++++++--- t/t4015-diff-whitespace.sh | 41 ++++++++++++++++++++++++++++++++++---- 2 files changed, 68 insertions(+), 7 deletions(-) diff --git a/diff.c b/diff.c index 941956d8c4..03ffe467e4 100644 --- a/diff.c +++ b/diff.c @@ -794,9 +794,11 @@ static void moved_block_clear(struct moved_block *b) memset(b, 0, sizeof(*b)); } +#define INDENT_BLANKLINE INT_MIN + static void fill_es_indent_data(struct emitted_diff_symbol *es) { - unsigned int off = 0; + 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; @@ -820,8 +822,18 @@ static void fill_es_indent_data(struct emitted_diff_symbol *es) } } - es->indent_off = off; - es->indent_width = width; + /* check if this line is blank */ + for (i = off; i < len; i++) + if (!isspace(s[i])) + break; + + 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, @@ -836,6 +848,11 @@ static int compute_ws_delta(const struct emitted_diff_symbol *a, 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 @@ -879,6 +896,10 @@ static int cmp_in_block_with_wsd(const struct diff_options *o, if (al != bl) 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 @@ -890,6 +911,13 @@ static int cmp_in_block_with_wsd(const struct diff_options *o, else delta = c_width - a_width; + /* + * If the previous lines of this block were all blank then set its + * whitespace delta. + */ + if (pmb->wsd == INDENT_BLANKLINE) + pmb->wsd = delta; + return !(delta == pmb->wsd && al - a_off == cl - c_off && !memcmp(a, b, al) && ! memcmp(a + a_off, c + c_off, al - a_off)); diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh index e023839ba6..9d6f88b07f 100755 --- a/t/t4015-diff-whitespace.sh +++ b/t/t4015-diff-whitespace.sh @@ -1901,10 +1901,20 @@ test_expect_success 'compare whitespace delta incompatible with other space opti test_i18ngrep allow-indentation-change err ' +EMPTY='' test_expect_success 'compare mixed whitespace delta across moved blocks' ' git reset --hard && tr Q_ "\t " <<-EOF >text.txt && + ${EMPTY} + ____too short without + ${EMPTY} + ___being grouped across blank line + ${EMPTY} + context + lines + to + anchor ____Indented text to _Q____be further indented by four spaces across ____Qseveral lines @@ -1918,9 +1928,18 @@ test_expect_success 'compare mixed whitespace delta across moved blocks' ' git commit -m "add text.txt" && tr Q_ "\t " <<-EOF >text.txt && + context + lines + to + anchor QIndented text to QQbe further indented by four spaces across Q____several lines + ${EMPTY} + QQtoo short without + ${EMPTY} + Q_______being grouped across blank line + ${EMPTY} Q_QThese two lines have had their indentation reduced by four spaces QQdifferent indentation change @@ -1937,7 +1956,16 @@ test_expect_success 'compare mixed whitespace delta across moved blocks' ' diff --git a/text.txt b/text.txt --- a/text.txt +++ b/text.txt - @@ -1,7 +1,7 @@ + @@ -1,16 +1,16 @@ + - + - too short without + - + - being grouped across blank line + - + context + lines + to + anchor - Indented text to - be further indented by four spaces across - several lines @@ -1948,9 +1976,14 @@ test_expect_success 'compare mixed whitespace delta across moved blocks' ' + Indented text to + be further indented by four spaces across + several lines - + These two lines have had their - +indentation reduced by four spaces - + different indentation change + + + + too short without + + + + being grouped across blank line + + + + These two lines have had their + +indentation reduced by four spaces + + different indentation change + too short EOF