diff options
Diffstat (limited to 'diff.c')
| -rw-r--r-- | diff.c | 112 |
1 files changed, 89 insertions, 23 deletions
@@ -23,7 +23,7 @@ #endif static int diff_detect_rename_default; -static int diff_rename_limit_default = 200; +static int diff_rename_limit_default = 400; static int diff_suppress_blank_empty; int diff_use_color_default = -1; static const char *diff_word_regex_cfg; @@ -245,6 +245,15 @@ static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one) return 0; } +/* like fill_mmfile, but only for size, so we can avoid retrieving blob */ +static unsigned long diff_filespec_size(struct diff_filespec *one) +{ + if (!DIFF_FILE_VALID(one)) + return 0; + diff_populate_filespec(one, 1); + return one->size; +} + static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule) { char *ptr = mf->ptr; @@ -609,22 +618,20 @@ static void diff_words_append(char *line, unsigned long len, buffer->text.ptr[buffer->text.size] = '\0'; } -struct diff_words_style_elem -{ +struct diff_words_style_elem { const char *prefix; const char *suffix; const char *color; /* NULL; filled in by the setup code if * color is enabled */ }; -struct diff_words_style -{ +struct diff_words_style { enum diff_words_type type; struct diff_words_style_elem new, old, ctx; const char *newline; }; -struct diff_words_style diff_words_styles[] = { +static struct diff_words_style diff_words_styles[] = { { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" }, { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" }, { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" } @@ -1238,7 +1245,7 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options) uintmax_t max_change = 0, max_len = 0; int total_files = data->nr; int width, name_width; - const char *reset, *set, *add_c, *del_c; + const char *reset, *add_c, *del_c; const char *line_prefix = ""; struct strbuf *msg = NULL; @@ -1265,7 +1272,6 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options) /* Find the longest filename and max number of changes */ reset = diff_get_color_opt(options, DIFF_RESET); - set = diff_get_color_opt(options, DIFF_PLAIN); add_c = diff_get_color_opt(options, DIFF_FILE_NEW); del_c = diff_get_color_opt(options, DIFF_FILE_OLD); @@ -1535,8 +1541,36 @@ 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->sha1_valid && p->two->sha1_valid) + content_changed = hashcmp(p->one->sha1, p->two->sha1); + else + content_changed = 1; + + if (!content_changed) { + /* + * The SHA1 has not changed, so pre-/post-content is + * identical. We can therefore skip looking at the + * file contents altogether. + */ + damage = 0; + goto found_damage; + } - name = p->one->path ? p->one->path : p->two->path; + if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) { + /* + * In --dirstat-by-file mode, we don't really need to + * look at the actual file contents at all. + * The fact that the SHA1 changed is enough for us to + * add this file to the list of results + * (with each file contributing equal damage). + */ + damage = 1; + goto found_damage; + } if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) { diff_populate_filespec(p->one, 0); @@ -1560,14 +1594,18 @@ static void show_dirstat(struct diff_options *options) /* * Original minus copied is the removed material, * added is the new material. They are both damages - * made to the preimage. In --dirstat-by-file mode, count - * damaged files, not damaged lines. This is done by - * counting only a single damaged line per file. + * 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 + * know that there must have been _some_ kind of change, + * so we force all entries to have damage > 0. */ damage = (p->one->size - copied) + added; - if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0) + if (!damage) damage = 1; +found_damage: ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc); dir.files[dir.nr].name = name; dir.files[dir.nr].changed = damage; @@ -2085,25 +2123,28 @@ static void builtin_diffstat(const char *name_a, const char *name_b, data->is_unmerged = 1; return; } - if (complete_rewrite) { + + if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) { + data->is_binary = 1; + data->added = diff_filespec_size(two); + data->deleted = diff_filespec_size(one); + } + + else if (complete_rewrite) { diff_populate_filespec(one, 0); diff_populate_filespec(two, 0); data->deleted = count_lines(one->data, one->size); data->added = count_lines(two->data, two->size); - goto free_and_return; } - if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) - die("unable to read files to diff"); - if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) { - data->is_binary = 1; - data->added = mf2.size; - data->deleted = mf1.size; - } else { + else { /* Crazy xdl interfaces.. */ xpparam_t xpp; xdemitconf_t xecfg; + if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) + die("unable to read files to diff"); + memset(&xpp, 0, sizeof(xpp)); memset(&xecfg, 0, sizeof(xecfg)); xpp.flags = o->xdl_opts; @@ -2111,7 +2152,6 @@ static void builtin_diffstat(const char *name_a, const char *name_b, &xpp, &xecfg); } - free_and_return: diff_free_filespec_data(one); diff_free_filespec_data(two); } @@ -3956,6 +3996,28 @@ static int is_summary_empty(const struct diff_queue_struct *q) return 1; } +static const char rename_limit_warning[] = +"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."; + +static const char rename_limit_advice[] = +"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); + else if (needed) + warning(rename_limit_warning); + else + return; + if (0 < needed && needed < 32767) + warning(rename_limit_advice, varname, needed); +} + void diff_flush(struct diff_options *options) { struct diff_queue_struct *q = &diff_queued_diff; @@ -4237,6 +4299,10 @@ void diffcore_std(struct diff_options *options) int diff_result_code(struct diff_options *opt, int status) { int result = 0; + + diff_warn_rename_limit("diff.renamelimit", + opt->needed_rename_limit, + opt->degraded_cc_to_c); if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) && !(opt->output_format & DIFF_FORMAT_CHECKDIFF)) return status; |