diff options
Diffstat (limited to 'diff.c')
| -rw-r--r-- | diff.c | 185 |
1 files changed, 134 insertions, 51 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; @@ -606,22 +615,20 @@ 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" } @@ -1043,8 +1050,16 @@ static void fn_out_consume(void *priv, char *line, unsigned long len) emit_line(ecbdata->opt, plain, reset, line, len); fputs("~\n", ecbdata->opt->file); } else { - /* don't print the prefix character */ - emit_line(ecbdata->opt, plain, reset, line+1, len-1); + /* + * Skip the prefix character, if any. With + * diff_suppress_blank_empty, there may be + * none. + */ + if (line[0] != '\n') { + line++; + len--; + } + emit_line(ecbdata->opt, plain, reset, line, len); } return; } @@ -1235,7 +1250,7 @@ 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; @@ -1262,7 +1277,6 @@ 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); @@ -1532,8 +1546,36 @@ 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; - name = p->one->path ? p->one->path : p->two->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; + } + + 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); @@ -1557,14 +1599,18 @@ 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; @@ -1771,8 +1817,14 @@ static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *pre static void diff_filespec_load_driver(struct diff_filespec *one) { - if (!one->driver) + /* Use already-loaded driver */ + if (one->driver) + return; + + if (S_ISREG(one->mode)) one->driver = userdiff_find_by_path(one->path); + + /* Fallback to default settings */ if (!one->driver) one->driver = userdiff_find_by_name("default"); } @@ -1820,8 +1872,7 @@ struct userdiff_driver *get_textconv(struct diff_filespec *one) { if (!DIFF_FILE_VALID(one)) return NULL; - if (!S_ISREG(one->mode)) - return NULL; + diff_filespec_load_driver(one); if (!one->driver->textconv) return NULL; @@ -2074,25 +2125,28 @@ 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; @@ -2100,7 +2154,6 @@ 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); } @@ -2153,7 +2206,7 @@ static void builtin_checkdiff(const char *name_a, const char *name_b, ecbdata.ws_rule = data.ws_rule; check_blank_at_eof(&mf1, &mf2, &ecbdata); - blank_at_eof = ecbdata.blank_at_eof_in_preimage; + blank_at_eof = ecbdata.blank_at_eof_in_postimage; if (blank_at_eof) { static char *err; @@ -2386,10 +2439,14 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only) } else { enum object_type type; - if (size_only) + if (size_only) { type = sha1_object_info(s->sha1, &s->size); - else { + if (type < 0) + die("unable to read %s", sha1_to_hex(s->sha1)); + } else { s->data = read_sha1_file(s->sha1, &type, &s->size); + if (!s->data) + die("unable to read %s", sha1_to_hex(s->sha1)); s->should_free = 1; } } @@ -3143,20 +3200,20 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac) else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") || !strcmp(arg, "--break-rewrites")) { if ((options->break_opt = diff_scoreopt_parse(arg)) == -1) - return -1; + return error("invalid argument to -B: %s", arg+2); } - else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--detect-renames=") || - !strcmp(arg, "--detect-renames")) { + else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") || + !strcmp(arg, "--find-renames")) { if ((options->rename_score = diff_scoreopt_parse(arg)) == -1) - return -1; + return error("invalid argument to -M: %s", arg+2); options->detect_rename = DIFF_DETECT_RENAME; } - else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--detect-copies=") || - !strcmp(arg, "--detect-copies")) { + else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") || + !strcmp(arg, "--find-copies")) { if (options->detect_rename == DIFF_DETECT_COPY) DIFF_OPT_SET(options, FIND_COPIES_HARDER); if ((options->rename_score = diff_scoreopt_parse(arg)) == -1) - return -1; + return error("invalid argument to -C: %s", arg+2); options->detect_rename = DIFF_DETECT_COPY; } else if (!strcmp(arg, "--no-renames")) @@ -3375,12 +3432,12 @@ static int diff_scoreopt_parse(const char *opt) opt += strlen("break-rewrites"); if (*opt == 0 || *opt++ == '=') cmd = 'B'; - } else if (!prefixcmp(opt, "detect-copies")) { - opt += strlen("detect-copies"); + } else if (!prefixcmp(opt, "find-copies")) { + opt += strlen("find-copies"); if (*opt == 0 || *opt++ == '=') cmd = 'C'; - } else if (!prefixcmp(opt, "detect-renames")) { - opt += strlen("detect-renames"); + } else if (!prefixcmp(opt, "find-renames")) { + opt += strlen("find-renames"); if (*opt == 0 || *opt++ == '=') cmd = 'M'; } @@ -3889,7 +3946,7 @@ static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1) xpp.flags = 0; xecfg.ctxlen = 3; - xecfg.flags = XDL_EMIT_FUNCNAMES; + xecfg.flags = 0; xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data, &xpp, &xecfg); } @@ -3938,6 +3995,28 @@ 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; @@ -4219,6 +4298,10 @@ 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; @@ -4332,20 +4415,20 @@ void diff_change(struct diff_options *options, DIFF_OPT_SET(options, HAS_CHANGES); } -void diff_unmerge(struct diff_options *options, - const char *path, - unsigned mode, const unsigned char *sha1) +struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path) { + struct diff_filepair *pair; struct diff_filespec *one, *two; if (options->prefix && strncmp(path, options->prefix, options->prefix_length)) - return; + return NULL; one = alloc_filespec(path); two = alloc_filespec(path); - fill_filespec(one, sha1, mode); - diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1; + pair = diff_queue(&diff_queued_diff, one, two); + pair->is_unmerged = 1; + return pair; } static char *run_textconv(const char *pgm, struct diff_filespec *spec, @@ -4403,7 +4486,7 @@ size_t fill_textconv(struct userdiff_driver *driver, return df->size; } - if (driver->textconv_cache) { + if (driver->textconv_cache && df->sha1_valid) { *outbuf = notes_cache_get(driver->textconv_cache, df->sha1, &size); if (*outbuf) @@ -4414,7 +4497,7 @@ size_t fill_textconv(struct userdiff_driver *driver, if (!*outbuf) die("unable to read files to diff"); - if (driver->textconv_cache) { + if (driver->textconv_cache && df->sha1_valid) { /* ignore errors, as we might be in a readonly repository */ notes_cache_put(driver->textconv_cache, df->sha1, *outbuf, size); |