X-Git-Url: http://git.tremily.us/?a=blobdiff_plain;f=diff.c;h=17873f3d9e88fccbf98e790d243397dcc4ccb24b;hb=cd035b1cef39811fd3116aa07d99395960ec947a;hp=57e1212fbcc9783d3fdbd248762247d8e0efd886;hpb=54dc78376652d5c3aa481c730bfb1336b0883136;p=git.git diff --git a/diff.c b/diff.c index 57e1212fb..17873f3d9 100644 --- a/diff.c +++ b/diff.c @@ -30,6 +30,7 @@ static const char *diff_word_regex_cfg; static const char *external_diff_cmd_cfg; int diff_auto_refresh_index = 1; static int diff_mnemonic_prefix; +static int diff_no_prefix; static char diff_colors[][COLOR_MAXLEN] = { GIT_COLOR_RESET, @@ -43,9 +44,6 @@ static char diff_colors[][COLOR_MAXLEN] = { GIT_COLOR_NORMAL, /* FUNCINFO */ }; -static void diff_filespec_load_driver(struct diff_filespec *one); -static char *run_textconv(const char *, struct diff_filespec *, size_t *); - static int parse_diff_color_slot(const char *var, int ofs) { if (!strcasecmp(var+ofs, "plain")) @@ -100,6 +98,10 @@ int git_diff_ui_config(const char *var, const char *value, void *cb) diff_mnemonic_prefix = git_config_bool(var, value); return 0; } + if (!strcmp(var, "diff.noprefix")) { + diff_no_prefix = git_config_bool(var, value); + return 0; + } if (!strcmp(var, "diff.external")) return git_config_string(&external_diff_cmd_cfg, var, value); if (!strcmp(var, "diff.wordregex")) @@ -193,8 +195,8 @@ struct emit_callback { sane_truncate_fn truncate; const char **label_path; struct diff_words_data *diff_words; + struct diff_options *opt; int *found_changesp; - FILE *file; struct strbuf *header; }; @@ -281,11 +283,19 @@ 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(FILE *file, const char *set, const char *reset, +static void emit_line_0(struct diff_options *o, const char *set, const char *reset, int first, const char *line, int len) { int has_trailing_newline, has_trailing_carriage_return; int nofirst; + FILE *file = o->file; + + if (o->output_prefix) { + struct strbuf *msg = NULL; + msg = o->output_prefix(o, o->output_prefix_data); + assert(msg); + fwrite(msg->buf, msg->len, 1, file); + } if (len == 0) { has_trailing_newline = (first == '\n'); @@ -315,10 +325,10 @@ static void emit_line_0(FILE *file, const char *set, const char *reset, fputc('\n', file); } -static void emit_line(FILE *file, const char *set, const char *reset, +static void emit_line(struct diff_options *o, const char *set, const char *reset, const char *line, int len) { - emit_line_0(file, set, reset, line[0], line+1, len-1); + emit_line_0(o, set, reset, line[0], line+1, len-1); } static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len) @@ -340,15 +350,15 @@ static void emit_add_line(const char *reset, const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW); if (!*ws) - emit_line_0(ecbdata->file, set, reset, '+', line, len); + emit_line_0(ecbdata->opt, set, reset, '+', line, len); else if (new_blank_line_at_eof(ecbdata, line, len)) /* Blank line at EOF - paint '+' as well */ - emit_line_0(ecbdata->file, ws, reset, '+', line, len); + emit_line_0(ecbdata->opt, ws, reset, '+', line, len); else { /* Emit just the prefix, then the rest. */ - emit_line_0(ecbdata->file, set, reset, '+', "", 0); + emit_line_0(ecbdata->opt, set, reset, '+', "", 0); ws_check_emit(line, len, ecbdata->ws_rule, - ecbdata->file, set, reset, ws); + ecbdata->opt->file, set, reset, ws); } } @@ -361,6 +371,9 @@ static void emit_hunk_header(struct emit_callback *ecbdata, const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET); static const char atat[2] = { '@', '@' }; const char *cp, *ep; + struct strbuf msgbuf = STRBUF_INIT; + int org_len = len; + int i = 1; /* * As a hunk header must begin with "@@ -, + @@", @@ -369,23 +382,42 @@ static void emit_hunk_header(struct emit_callback *ecbdata, if (len < 10 || memcmp(line, atat, 2) || !(ep = memmem(line + 2, len - 2, atat, 2))) { - emit_line(ecbdata->file, plain, reset, line, len); + emit_line(ecbdata->opt, plain, reset, line, len); return; } ep += 2; /* skip over @@ */ /* The hunk header in fraginfo color */ - emit_line(ecbdata->file, frag, reset, line, ep - line); + strbuf_add(&msgbuf, frag, strlen(frag)); + strbuf_add(&msgbuf, line, ep - line); + strbuf_add(&msgbuf, reset, strlen(reset)); + + /* + * trailing "\r\n" + */ + for ( ; i < 3; i++) + if (line[len - i] == '\r' || line[len - i] == '\n') + len--; /* blank before the func header */ for (cp = ep; ep - line < len; ep++) if (*ep != ' ' && *ep != '\t') break; - if (ep != cp) - emit_line(ecbdata->file, plain, reset, cp, ep - cp); + if (ep != cp) { + strbuf_add(&msgbuf, plain, strlen(plain)); + strbuf_add(&msgbuf, cp, ep - cp); + strbuf_add(&msgbuf, reset, strlen(reset)); + } + + if (ep < line + len) { + strbuf_add(&msgbuf, func, strlen(func)); + strbuf_add(&msgbuf, ep, line + len - ep); + strbuf_add(&msgbuf, reset, strlen(reset)); + } - if (ep < line + len) - emit_line(ecbdata->file, func, reset, ep, line + len - ep); + strbuf_add(&msgbuf, line + len, org_len - len); + emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len); + strbuf_release(&msgbuf); } static struct diff_tempfile *claim_diff_tempfile(void) { @@ -445,7 +477,7 @@ static void emit_rewrite_lines(struct emit_callback *ecb, len = endp ? (endp - data + 1) : size; if (prefix != '+') { ecb->lno_in_preimage++; - emit_line_0(ecb->file, old, reset, '-', + emit_line_0(ecb->opt, old, reset, '-', data, len); } else { ecb->lno_in_postimage++; @@ -457,7 +489,7 @@ static void emit_rewrite_lines(struct emit_callback *ecb, if (!endp) { const char *plain = diff_get_color(ecb->color_diff, DIFF_PLAIN); - emit_line_0(ecb->file, plain, reset, '\\', + emit_line_0(ecb->opt, plain, reset, '\\', nneof, strlen(nneof)); } } @@ -466,8 +498,8 @@ static void emit_rewrite_diff(const char *name_a, const char *name_b, struct diff_filespec *one, struct diff_filespec *two, - const char *textconv_one, - const char *textconv_two, + struct userdiff_driver *textconv_one, + struct userdiff_driver *textconv_two, struct diff_options *o) { int lc_a, lc_b; @@ -478,9 +510,16 @@ static void emit_rewrite_diff(const char *name_a, const char *reset = diff_get_color(color_diff, DIFF_RESET); static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT; const char *a_prefix, *b_prefix; - const char *data_one, *data_two; + char *data_one, *data_two; size_t size_one, size_two; struct emit_callback ecbdata; + char *line_prefix = ""; + struct strbuf *msgbuf; + + if (o && o->output_prefix) { + msgbuf = o->output_prefix(o, o->output_prefix_data); + line_prefix = msgbuf->buf; + } if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) { a_prefix = o->b_prefix; @@ -500,32 +539,14 @@ 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); - diff_populate_filespec(one, 0); - diff_populate_filespec(two, 0); - if (textconv_one) { - data_one = run_textconv(textconv_one, one, &size_one); - if (!data_one) - die("unable to read files to diff"); - } - else { - data_one = one->data; - size_one = one->size; - } - if (textconv_two) { - data_two = run_textconv(textconv_two, two, &size_two); - if (!data_two) - die("unable to read files to diff"); - } - else { - data_two = two->data; - size_two = two->size; - } + size_one = fill_textconv(textconv_one, one, &data_one); + size_two = fill_textconv(textconv_two, two, &data_two); memset(&ecbdata, 0, sizeof(ecbdata)); ecbdata.color_diff = color_diff; ecbdata.found_changesp = &o->found_changes; ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a); - ecbdata.file = o->file; + ecbdata.opt = o; if (ecbdata.ws_rule & WS_BLANK_AT_EOF) { mmfile_t mf1, mf2; mf1.ptr = (char *)data_one; @@ -540,9 +561,10 @@ static void emit_rewrite_diff(const char *name_a, lc_a = count_lines(data_one, size_one); lc_b = count_lines(data_two, size_two); fprintf(o->file, - "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -", - metainfo, a_name.buf, name_a_tab, reset, - metainfo, b_name.buf, name_b_tab, reset, fraginfo); + "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -", + line_prefix, metainfo, a_name.buf, name_a_tab, reset, + line_prefix, metainfo, b_name.buf, name_b_tab, reset, + line_prefix, fraginfo); print_line_count(o->file, lc_a); fprintf(o->file, " +"); print_line_count(o->file, lc_b); @@ -577,23 +599,134 @@ static void diff_words_append(char *line, unsigned long len, buffer->text.ptr[buffer->text.size] = '\0'; } +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 +{ + enum diff_words_type type; + struct diff_words_style_elem new, old, ctx; + const char *newline; +}; + +struct diff_words_style diff_words_styles[] = { + { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" }, + { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" }, + { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" } +}; + struct diff_words_data { struct diff_words_buffer minus, plus; const char *current_plus; - FILE *file; + int last_minus; + struct diff_options *opt; regex_t *word_regex; + enum diff_words_type type; + struct diff_words_style *style; }; +static int fn_out_diff_words_write_helper(FILE *fp, + struct diff_words_style_elem *st_el, + const char *newline, + size_t count, const char *buf, + const char *line_prefix) +{ + int print = 0; + + while (count) { + char *p = memchr(buf, '\n', count); + if (print) + fputs(line_prefix, fp); + if (p != buf) { + if (st_el->color && fputs(st_el->color, fp) < 0) + return -1; + if (fputs(st_el->prefix, fp) < 0 || + fwrite(buf, p ? p - buf : count, 1, fp) != 1 || + fputs(st_el->suffix, fp) < 0) + return -1; + if (st_el->color && *st_el->color + && fputs(GIT_COLOR_RESET, fp) < 0) + return -1; + } + if (!p) + return 0; + if (fputs(newline, fp) < 0) + return -1; + count -= p + 1 - buf; + buf = p + 1; + print = 1; + } + return 0; +} + +/* + * '--color-words' algorithm can be described as: + * + * 1. collect a the minus/plus lines of a diff hunk, divided into + * minus-lines and plus-lines; + * + * 2. break both minus-lines and plus-lines into words and + * place them into two mmfile_t with one word for each line; + * + * 3. use xdiff to run diff on the two mmfile_t to get the words level diff; + * + * And for the common parts of the both file, we output the plus side text. + * diff_words->current_plus is used to trace the current position of the plus file + * which printed. diff_words->last_minus is used to trace the last minus word + * printed. + * + * For '--graph' to work with '--color-words', we need to output the graph prefix + * on each line of color words output. Generally, there are two conditions on + * which we should output the prefix. + * + * 1. diff_words->last_minus == 0 && + * diff_words->current_plus == diff_words->plus.text.ptr + * + * that is: the plus text must start as a new line, and if there is no minus + * word printed, a graph prefix must be printed. + * + * 2. diff_words->current_plus > diff_words->plus.text.ptr && + * *(diff_words->current_plus - 1) == '\n' + * + * that is: a graph prefix must be printed following a '\n' + */ +static int color_words_output_graph_prefix(struct diff_words_data *diff_words) +{ + if ((diff_words->last_minus == 0 && + diff_words->current_plus == diff_words->plus.text.ptr) || + (diff_words->current_plus > diff_words->plus.text.ptr && + *(diff_words->current_plus - 1) == '\n')) { + return 1; + } else { + return 0; + } +} + static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len) { struct diff_words_data *diff_words = priv; + struct diff_words_style *style = diff_words->style; int minus_first, minus_len, plus_first, plus_len; const char *minus_begin, *minus_end, *plus_begin, *plus_end; + struct diff_options *opt = diff_words->opt; + struct strbuf *msgbuf; + char *line_prefix = ""; if (line[0] != '@' || parse_hunk_header(line, len, &minus_first, &minus_len, &plus_first, &plus_len)) return; + assert(opt); + if (opt->output_prefix) { + msgbuf = opt->output_prefix(opt, opt->output_prefix_data); + line_prefix = msgbuf->buf; + } + /* POSIX requires that first be decremented by one if len == 0... */ if (minus_len) { minus_begin = diff_words->minus.orig[minus_first].begin; @@ -609,20 +742,32 @@ static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len) } else plus_begin = plus_end = diff_words->plus.orig[plus_first].end; - if (diff_words->current_plus != plus_begin) - fwrite(diff_words->current_plus, - plus_begin - diff_words->current_plus, 1, - diff_words->file); - if (minus_begin != minus_end) - color_fwrite_lines(diff_words->file, - diff_get_color(1, DIFF_FILE_OLD), - minus_end - minus_begin, minus_begin); - if (plus_begin != plus_end) - color_fwrite_lines(diff_words->file, - diff_get_color(1, DIFF_FILE_NEW), - plus_end - plus_begin, plus_begin); + if (color_words_output_graph_prefix(diff_words)) { + fputs(line_prefix, diff_words->opt->file); + } + if (diff_words->current_plus != plus_begin) { + fn_out_diff_words_write_helper(diff_words->opt->file, + &style->ctx, style->newline, + plus_begin - diff_words->current_plus, + diff_words->current_plus, line_prefix); + if (*(plus_begin - 1) == '\n') + fputs(line_prefix, diff_words->opt->file); + } + if (minus_begin != minus_end) { + fn_out_diff_words_write_helper(diff_words->opt->file, + &style->old, style->newline, + minus_end - minus_begin, minus_begin, + line_prefix); + } + if (plus_begin != plus_end) { + fn_out_diff_words_write_helper(diff_words->opt->file, + &style->new, style->newline, + plus_end - plus_begin, plus_begin, + line_prefix); + } diff_words->current_plus = plus_end; + diff_words->last_minus = minus_first; } /* This function starts looking at *begin, and returns 0 iff a word was found. */ @@ -701,17 +846,31 @@ static void diff_words_show(struct diff_words_data *diff_words) xpparam_t xpp; xdemitconf_t xecfg; mmfile_t minus, plus; + struct diff_words_style *style = diff_words->style; + + struct diff_options *opt = diff_words->opt; + struct strbuf *msgbuf; + char *line_prefix = ""; + + assert(opt); + if (opt->output_prefix) { + msgbuf = opt->output_prefix(opt, opt->output_prefix_data); + line_prefix = msgbuf->buf; + } /* special case: only removal */ if (!diff_words->plus.text.size) { - color_fwrite_lines(diff_words->file, - diff_get_color(1, DIFF_FILE_OLD), - diff_words->minus.text.size, diff_words->minus.text.ptr); + fputs(line_prefix, diff_words->opt->file); + fn_out_diff_words_write_helper(diff_words->opt->file, + &style->old, style->newline, + diff_words->minus.text.size, + diff_words->minus.text.ptr, line_prefix); diff_words->minus.text.size = 0; return; } diff_words->current_plus = diff_words->plus.text.ptr; + diff_words->last_minus = 0; memset(&xpp, 0, sizeof(xpp)); memset(&xecfg, 0, sizeof(xecfg)); @@ -725,11 +884,15 @@ static void diff_words_show(struct diff_words_data *diff_words) free(minus.ptr); free(plus.ptr); if (diff_words->current_plus != diff_words->plus.text.ptr + - diff_words->plus.text.size) - fwrite(diff_words->current_plus, + diff_words->plus.text.size) { + if (color_words_output_graph_prefix(diff_words)) + fputs(line_prefix, diff_words->opt->file); + fn_out_diff_words_write_helper(diff_words->opt->file, + &style->ctx, style->newline, diff_words->plus.text.ptr + diff_words->plus.text.size - - diff_words->current_plus, 1, - diff_words->file); + - diff_words->current_plus, diff_words->current_plus, + line_prefix); + } diff_words->minus.text.size = diff_words->plus.text.size = 0; } @@ -801,9 +964,17 @@ static void fn_out_consume(void *priv, char *line, unsigned long len) const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO); const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN); const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET); + struct diff_options *o = ecbdata->opt; + char *line_prefix = ""; + struct strbuf *msgbuf; + + if (o && o->output_prefix) { + msgbuf = o->output_prefix(o, o->output_prefix_data); + line_prefix = msgbuf->buf; + } if (ecbdata->header) { - fprintf(ecbdata->file, "%s", ecbdata->header->buf); + fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf); strbuf_reset(ecbdata->header); ecbdata->header = NULL; } @@ -815,10 +986,10 @@ static void fn_out_consume(void *priv, char *line, unsigned long len) name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : ""; name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : ""; - fprintf(ecbdata->file, "%s--- %s%s%s\n", - meta, ecbdata->label_path[0], reset, name_a_tab); - fprintf(ecbdata->file, "%s+++ %s%s%s\n", - meta, ecbdata->label_path[1], reset, name_b_tab); + fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n", + line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab); + fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n", + line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab); ecbdata->label_path[0] = ecbdata->label_path[1] = NULL; } @@ -835,12 +1006,15 @@ static void fn_out_consume(void *priv, char *line, unsigned long len) find_lno(line, ecbdata); emit_hunk_header(ecbdata, line, len); if (line[len-1] != '\n') - putc('\n', ecbdata->file); + putc('\n', ecbdata->opt->file); return; } if (len < 1) { - emit_line(ecbdata->file, reset, reset, line, len); + emit_line(ecbdata->opt, reset, reset, line, len); + if (ecbdata->diff_words + && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) + fputs("~\n", ecbdata->opt->file); return; } @@ -855,9 +1029,13 @@ static void fn_out_consume(void *priv, char *line, unsigned long len) return; } diff_words_flush(ecbdata); - line++; - len--; - emit_line(ecbdata->file, plain, reset, line, len); + if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) { + 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); + } return; } @@ -868,7 +1046,7 @@ static void fn_out_consume(void *priv, char *line, unsigned long len) ecbdata->lno_in_preimage++; if (line[0] == ' ') ecbdata->lno_in_postimage++; - emit_line(ecbdata->file, color, reset, line, len); + emit_line(ecbdata->opt, color, reset, line, len); } else { ecbdata->lno_in_postimage++; emit_add_line(reset, ecbdata, line + 1, len - 1); @@ -1048,10 +1226,17 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options) int total_files = data->nr; int width, name_width; const char *reset, *set, *add_c, *del_c; + const char *line_prefix = ""; + struct strbuf *msg = NULL; if (data->nr == 0) return; + if (options->output_prefix) { + msg = options->output_prefix(options, options->output_prefix_data); + line_prefix = msg->buf; + } + width = options->stat_width ? options->stat_width : 80; name_width = options->stat_name_width ? options->stat_name_width : 50; @@ -1121,6 +1306,7 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options) } if (data->files[i]->is_binary) { + fprintf(options->file, "%s", line_prefix); show_name(options->file, prefix, name, len); fprintf(options->file, " Bin "); fprintf(options->file, "%s%"PRIuMAX"%s", @@ -1133,6 +1319,7 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options) continue; } else if (data->files[i]->is_unmerged) { + fprintf(options->file, "%s", line_prefix); show_name(options->file, prefix, name, len); fprintf(options->file, " Unmerged\n"); continue; @@ -1155,6 +1342,7 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options) add = scale_linear(add, width, max_change); del = scale_linear(del, width, max_change); } + fprintf(options->file, "%s", line_prefix); show_name(options->file, prefix, name, len); fprintf(options->file, "%5"PRIuMAX"%s", added + deleted, added + deleted ? " " : ""); @@ -1162,6 +1350,7 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options) show_graph(options->file, '-', del, del_c, reset); fprintf(options->file, "\n"); } + fprintf(options->file, "%s", line_prefix); fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n", total_files, adds, dels); @@ -1188,6 +1377,12 @@ static void show_shortstats(struct diffstat_t *data, struct diff_options *option } } } + if (options->output_prefix) { + struct strbuf *msg = NULL; + msg = options->output_prefix(options, + options->output_prefix_data); + fprintf(options->file, "%s", msg->buf); + } fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n", total_files, adds, dels); } @@ -1202,6 +1397,13 @@ static void show_numstat(struct diffstat_t *data, struct diff_options *options) for (i = 0; i < data->nr; i++) { struct diffstat_file *file = data->files[i]; + if (options->output_prefix) { + struct strbuf *msg = NULL; + msg = options->output_prefix(options, + options->output_prefix_data); + fprintf(options->file, "%s", msg->buf); + } + if (file->is_binary) fprintf(options->file, "-\t-\t"); else @@ -1237,10 +1439,18 @@ struct dirstat_dir { int alloc, nr, percent, cumulative; }; -static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen) +static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir, + unsigned long changed, const char *base, int baselen) { unsigned long this_dir = 0; unsigned int sources = 0; + const char *line_prefix = ""; + struct strbuf *msg = NULL; + + if (opt->output_prefix) { + msg = opt->output_prefix(opt, opt->output_prefix_data); + line_prefix = msg->buf; + } while (dir->nr) { struct dirstat_file *f = dir->files; @@ -1255,7 +1465,7 @@ static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long ch slash = strchr(f->name + baselen, '/'); if (slash) { int newbaselen = slash + 1 - f->name; - this = gather_dirstat(file, dir, changed, f->name, newbaselen); + this = gather_dirstat(opt, dir, changed, f->name, newbaselen); sources++; } else { this = f->changed; @@ -1277,7 +1487,8 @@ static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long ch if (permille) { int percent = permille / 10; if (percent >= dir->percent) { - fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base); + fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix, + percent, permille % 10, baselen, base); if (!dir->cumulative) return 0; } @@ -1357,7 +1568,7 @@ static void show_dirstat(struct diff_options *options) /* Show all directories with more than x% of the changes */ qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare); - gather_dirstat(options->file, &dir, changed, "", 0); + gather_dirstat(options, &dir, changed, "", 0); } static void free_diffstat_info(struct diffstat_t *diffstat) @@ -1415,6 +1626,15 @@ static void checkdiff_consume(void *priv, char *line, unsigned long len) const char *reset = diff_get_color(color_diff, DIFF_RESET); const char *set = diff_get_color(color_diff, DIFF_FILE_NEW); char *err; + char *line_prefix = ""; + struct strbuf *msgbuf; + + assert(data->o); + if (data->o->output_prefix) { + msgbuf = data->o->output_prefix(data->o, + data->o->output_prefix_data); + line_prefix = msgbuf->buf; + } if (line[0] == '+') { unsigned bad; @@ -1422,18 +1642,18 @@ static void checkdiff_consume(void *priv, char *line, unsigned long len) if (is_conflict_marker(line + 1, marker_size, len - 1)) { data->status |= 1; fprintf(data->o->file, - "%s:%d: leftover conflict marker\n", - data->filename, data->lineno); + "%s%s:%d: leftover conflict marker\n", + line_prefix, data->filename, data->lineno); } bad = ws_check(line + 1, len - 1, data->ws_rule); if (!bad) return; data->status |= bad; err = whitespace_error_string(bad); - fprintf(data->o->file, "%s:%d: %s.\n", - data->filename, data->lineno, err); + fprintf(data->o->file, "%s%s:%d: %s.\n", + line_prefix, data->filename, data->lineno, err); free(err); - emit_line(data->o->file, set, reset, line, 1); + emit_line(data->o, set, reset, line, 1); ws_check_emit(line + 1, len - 1, data->ws_rule, data->o->file, set, reset, ws); } else if (line[0] == ' ') { @@ -1471,7 +1691,7 @@ static unsigned char *deflate_it(char *data, return deflated; } -static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two) +static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix) { void *cp; void *delta; @@ -1500,13 +1720,13 @@ static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two) } if (delta && delta_size < deflate_size) { - fprintf(file, "delta %lu\n", orig_size); + fprintf(file, "%sdelta %lu\n", prefix, orig_size); free(deflated); data = delta; data_size = delta_size; } else { - fprintf(file, "literal %lu\n", two->size); + fprintf(file, "%sliteral %lu\n", prefix, two->size); free(delta); data = deflated; data_size = deflate_size; @@ -1524,18 +1744,19 @@ static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two) line[0] = bytes - 26 + 'a' - 1; encode_85(line + 1, cp, bytes); cp = (char *) cp + bytes; + fprintf(file, "%s", prefix); fputs(line, file); fputc('\n', file); } - fprintf(file, "\n"); + fprintf(file, "%s\n", prefix); free(data); } -static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two) +static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix) { - fprintf(file, "GIT binary patch\n"); - emit_binary_diff_body(file, one, two); - emit_binary_diff_body(file, two, one); + fprintf(file, "%sGIT binary patch\n", prefix); + emit_binary_diff_body(file, one, two, prefix); + emit_binary_diff_body(file, two, one, prefix); } static void diff_filespec_load_driver(struct diff_filespec *one) @@ -1585,14 +1806,26 @@ void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const options->b_prefix = b; } -static const char *get_textconv(struct diff_filespec *one) +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); - return one->driver->textconv; + if (!one->driver->textconv) + return NULL; + + if (one->driver->textconv_want_cache && !one->driver->textconv_cache) { + struct notes_cache *c = xmalloc(sizeof(*c)); + struct strbuf name = STRBUF_INIT; + + strbuf_addf(&name, "textconv/%s", one->driver->name); + notes_cache_init(c, name.buf, one->driver->textconv); + one->driver->textconv_cache = c; + } + + return one->driver; } static void builtin_diff(const char *name_a, @@ -1610,8 +1843,16 @@ static void builtin_diff(const char *name_a, const char *set = diff_get_color_opt(o, DIFF_METAINFO); const char *reset = diff_get_color_opt(o, DIFF_RESET); const char *a_prefix, *b_prefix; - const char *textconv_one = NULL, *textconv_two = NULL; + struct userdiff_driver *textconv_one = NULL; + struct userdiff_driver *textconv_two = NULL; struct strbuf header = STRBUF_INIT; + struct strbuf *msgbuf; + char *line_prefix = ""; + + if (o->output_prefix) { + msgbuf = o->output_prefix(o, o->output_prefix_data); + line_prefix = msgbuf->buf; + } if (DIFF_OPT_TST(o, SUBMODULE_LOG) && (!one->mode || S_ISGITLINK(one->mode)) && @@ -1646,24 +1887,24 @@ static void builtin_diff(const char *name_a, b_two = quote_two(b_prefix, name_b + (*name_b == '/')); lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null"; lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null"; - strbuf_addf(&header, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset); + strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset); if (lbl[0][0] == '/') { /* /dev/null */ - strbuf_addf(&header, "%snew file mode %06o%s\n", set, two->mode, reset); + strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset); if (xfrm_msg) strbuf_addstr(&header, xfrm_msg); must_show_header = 1; } else if (lbl[1][0] == '/') { - strbuf_addf(&header, "%sdeleted file mode %06o%s\n", set, one->mode, reset); + strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset); if (xfrm_msg) strbuf_addstr(&header, xfrm_msg); must_show_header = 1; } else { if (one->mode != two->mode) { - strbuf_addf(&header, "%sold mode %06o%s\n", set, one->mode, reset); - strbuf_addf(&header, "%snew mode %06o%s\n", set, two->mode, reset); + strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset); + strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset); must_show_header = 1; } if (xfrm_msg) @@ -1687,12 +1928,11 @@ static void builtin_diff(const char *name_a, } } - if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) - die("unable to read files to diff"); - if (!DIFF_OPT_TST(o, TEXT) && - ( (diff_filespec_is_binary(one) && !textconv_one) || - (diff_filespec_is_binary(two) && !textconv_two) )) { + ( (!textconv_one && diff_filespec_is_binary(one)) || + (!textconv_two && diff_filespec_is_binary(two)) )) { + if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) + die("unable to read files to diff"); /* Quite common confusing case */ if (mf1.size == mf2.size && !memcmp(mf1.ptr, mf2.ptr, mf1.size)) { @@ -1703,10 +1943,10 @@ static void builtin_diff(const char *name_a, fprintf(o->file, "%s", header.buf); strbuf_reset(&header); if (DIFF_OPT_TST(o, BINARY)) - emit_binary_diff(o->file, &mf1, &mf2); + emit_binary_diff(o->file, &mf1, &mf2, line_prefix); else - fprintf(o->file, "Binary files %s and %s differ\n", - lbl[0], lbl[1]); + fprintf(o->file, "%sBinary files %s and %s differ\n", + line_prefix, lbl[0], lbl[1]); o->found_changes = 1; } else { @@ -1722,20 +1962,8 @@ static void builtin_diff(const char *name_a, strbuf_reset(&header); } - if (textconv_one) { - size_t size; - mf1.ptr = run_textconv(textconv_one, one, &size); - if (!mf1.ptr) - die("unable to read files to diff"); - mf1.size = size; - } - if (textconv_two) { - size_t size; - mf2.ptr = run_textconv(textconv_two, two, &size); - if (!mf2.ptr) - die("unable to read files to diff"); - mf2.size = size; - } + mf1.size = fill_textconv(textconv_one, one, &mf1.ptr); + mf2.size = fill_textconv(textconv_two, two, &mf2.ptr); pe = diff_funcname_pattern(one); if (!pe) @@ -1750,7 +1978,7 @@ static void builtin_diff(const char *name_a, ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a); if (ecbdata.ws_rule & WS_BLANK_AT_EOF) check_blank_at_eof(&mf1, &mf2, &ecbdata); - ecbdata.file = o->file; + ecbdata.opt = o; ecbdata.header = header.len ? &header : NULL; xpp.flags = o->xdl_opts; xecfg.ctxlen = o->context; @@ -1764,10 +1992,13 @@ static void builtin_diff(const char *name_a, xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10); else if (!prefixcmp(diffopts, "-u")) xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10); - if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) { + if (o->word_diff) { + int i; + ecbdata.diff_words = xcalloc(1, sizeof(struct diff_words_data)); - ecbdata.diff_words->file = o->file; + ecbdata.diff_words->type = o->word_diff; + ecbdata.diff_words->opt = o; if (!o->word_regex) o->word_regex = userdiff_word_regex(one); if (!o->word_regex) @@ -1783,10 +2014,23 @@ static void builtin_diff(const char *name_a, 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) { + ecbdata.diff_words->style = + &diff_words_styles[i]; + break; + } + } + if (DIFF_OPT_TST(o, COLOR_DIFF)) { + struct diff_words_style *st = ecbdata.diff_words->style; + st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD); + st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW); + st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN); + } } xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata, &xpp, &xecfg); - if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) + if (o->word_diff) free_diff_words_data(&ecbdata); if (textconv_one) free(mf1.ptr); @@ -2332,31 +2576,41 @@ static void fill_metainfo(struct strbuf *msg, { const char *set = diff_get_color(use_color, DIFF_METAINFO); const char *reset = diff_get_color(use_color, DIFF_RESET); + struct strbuf *msgbuf; + char *line_prefix = ""; *must_show_header = 1; + if (o->output_prefix) { + msgbuf = o->output_prefix(o, o->output_prefix_data); + line_prefix = msgbuf->buf; + } strbuf_init(msg, PATH_MAX * 2 + 300); switch (p->status) { case DIFF_STATUS_COPIED: - strbuf_addf(msg, "%ssimilarity index %d%%", - set, similarity_index(p)); - strbuf_addf(msg, "%s\n%scopy from ", reset, set); + strbuf_addf(msg, "%s%ssimilarity index %d%%", + line_prefix, set, similarity_index(p)); + strbuf_addf(msg, "%s\n%s%scopy from ", + reset, line_prefix, set); quote_c_style(name, msg, NULL, 0); - strbuf_addf(msg, "%s\n%scopy to ", reset, set); + strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set); quote_c_style(other, msg, NULL, 0); strbuf_addf(msg, "%s\n", reset); break; case DIFF_STATUS_RENAMED: - strbuf_addf(msg, "%ssimilarity index %d%%", - set, similarity_index(p)); - strbuf_addf(msg, "%s\n%srename from ", reset, set); + strbuf_addf(msg, "%s%ssimilarity index %d%%", + line_prefix, set, similarity_index(p)); + strbuf_addf(msg, "%s\n%s%srename from ", + reset, line_prefix, set); quote_c_style(name, msg, NULL, 0); - strbuf_addf(msg, "%s\n%srename to ", reset, set); + strbuf_addf(msg, "%s\n%s%srename to ", + reset, line_prefix, set); quote_c_style(other, msg, NULL, 0); strbuf_addf(msg, "%s\n", reset); break; case DIFF_STATUS_MODIFIED: if (p->score) { - strbuf_addf(msg, "%sdissimilarity index %d%%%s\n", + strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n", + line_prefix, set, similarity_index(p), reset); break; } @@ -2373,9 +2627,9 @@ static void fill_metainfo(struct strbuf *msg, (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two))) abbrev = 40; } - strbuf_addf(msg, "%sindex %.*s..%.*s", set, - abbrev, sha1_to_hex(one->sha1), - abbrev, sha1_to_hex(two->sha1)); + strbuf_addf(msg, "%s%sindex %s..", line_prefix, set, + find_unique_abbrev(one->sha1, abbrev)); + strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev)); if (one->mode == two->mode) strbuf_addf(msg, " %06o", one->mode); strbuf_addf(msg, "%s\n", reset); @@ -2560,6 +2814,7 @@ static void run_checkdiff(struct diff_filepair *p, struct diff_options *o) void diff_setup(struct diff_options *options) { memset(options, 0, sizeof(*options)); + memset(&diff_queued_diff, 0, sizeof(diff_queued_diff)); options->file = stdout; @@ -2575,7 +2830,9 @@ void diff_setup(struct diff_options *options) DIFF_OPT_SET(options, COLOR_DIFF); options->detect_rename = diff_detect_rename_default; - if (!diff_mnemonic_prefix) { + if (diff_no_prefix) { + options->a_prefix = options->b_prefix = ""; + } else if (!diff_mnemonic_prefix) { options->a_prefix = "a/"; options->b_prefix = "b/"; } @@ -2738,7 +2995,7 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac) const char *arg = av[0]; /* Output format options */ - if (!strcmp(arg, "-p") || !strcmp(arg, "-u")) + if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")) options->output_format |= DIFF_FORMAT_PATCH; else if (opt_arg(arg, 'U', "unified", &options->context)) options->output_format |= DIFF_FORMAT_PATCH; @@ -2866,13 +3123,37 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac) DIFF_OPT_CLR(options, COLOR_DIFF); else if (!strcmp(arg, "--color-words")) { DIFF_OPT_SET(options, COLOR_DIFF); - DIFF_OPT_SET(options, COLOR_DIFF_WORDS); + options->word_diff = DIFF_WORDS_COLOR; } else if (!prefixcmp(arg, "--color-words=")) { DIFF_OPT_SET(options, COLOR_DIFF); - DIFF_OPT_SET(options, COLOR_DIFF_WORDS); + options->word_diff = DIFF_WORDS_COLOR; options->word_regex = arg + 14; } + else if (!strcmp(arg, "--word-diff")) { + if (options->word_diff == DIFF_WORDS_NONE) + options->word_diff = DIFF_WORDS_PLAIN; + } + else if (!prefixcmp(arg, "--word-diff=")) { + const char *type = arg + 12; + if (!strcmp(type, "plain")) + options->word_diff = DIFF_WORDS_PLAIN; + else if (!strcmp(type, "color")) { + DIFF_OPT_SET(options, COLOR_DIFF); + options->word_diff = DIFF_WORDS_COLOR; + } + else if (!strcmp(type, "porcelain")) + options->word_diff = DIFF_WORDS_PORCELAIN; + else if (!strcmp(type, "none")) + options->word_diff = DIFF_WORDS_NONE; + else + die("bad --word-diff argument: %s", type); + } + else if (!prefixcmp(arg, "--word-diff-regex=")) { + if (options->word_diff == DIFF_WORDS_NONE) + options->word_diff = DIFF_WORDS_PLAIN; + options->word_regex = arg + 18; + } else if (!strcmp(arg, "--exit-code")) DIFF_OPT_SET(options, EXIT_WITH_STATUS); else if (!strcmp(arg, "--quiet")) @@ -2886,7 +3167,9 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac) else if (!strcmp(arg, "--no-textconv")) DIFF_OPT_CLR(options, ALLOW_TEXTCONV); else if (!strcmp(arg, "--ignore-submodules")) - DIFF_OPT_SET(options, IGNORE_SUBMODULES); + handle_ignore_submodules_arg(options, "all"); + else if (!prefixcmp(arg, "--ignore-submodules=")) + handle_ignore_submodules_arg(options, arg + 20); else if (!strcmp(arg, "--submodule")) DIFF_OPT_SET(options, SUBMODULE_LOG); else if (!prefixcmp(arg, "--submodule=")) { @@ -3059,6 +3342,11 @@ static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt) { int line_termination = opt->line_termination; int inter_name_termination = line_termination ? '\t' : '\0'; + if (opt->output_prefix) { + struct strbuf *msg = NULL; + msg = opt->output_prefix(opt, opt->output_prefix_data); + fprintf(opt->file, "%s", msg->buf); + } if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) { fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode, @@ -3304,48 +3592,62 @@ static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_f } -static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name) +static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name, + const char *line_prefix) { if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) { - fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode, - show_name ? ' ' : '\n'); + fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode, + p->two->mode, show_name ? ' ' : '\n'); if (show_name) { write_name_quoted(p->two->path, file, '\n'); } } } -static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p) +static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p, + const char *line_prefix) { char *names = pprint_rename(p->one->path, p->two->path); fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p)); free(names); - show_mode_change(file, p, 0); + show_mode_change(file, p, 0, line_prefix); } -static void diff_summary(FILE *file, struct diff_filepair *p) +static void diff_summary(struct diff_options *opt, struct diff_filepair *p) { + FILE *file = opt->file; + char *line_prefix = ""; + + if (opt->output_prefix) { + struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data); + line_prefix = buf->buf; + } + switch(p->status) { case DIFF_STATUS_DELETED: + fputs(line_prefix, file); show_file_mode_name(file, "delete", p->one); break; case DIFF_STATUS_ADDED: + fputs(line_prefix, file); show_file_mode_name(file, "create", p->two); break; case DIFF_STATUS_COPIED: - show_rename_copy(file, "copy", p); + fputs(line_prefix, file); + show_rename_copy(file, "copy", p, line_prefix); break; case DIFF_STATUS_RENAMED: - show_rename_copy(file, "rename", p); + fputs(line_prefix, file); + show_rename_copy(file, "rename", p, line_prefix); break; default: if (p->score) { - fputs(" rewrite ", file); + fprintf(file, "%s rewrite ", line_prefix); write_name_quoted(p->two->path, file, ' '); fprintf(file, "(%d%%)\n", similarity_index(p)); } - show_mode_change(file, p, !p->score); + show_mode_change(file, p, !p->score, line_prefix); break; } } @@ -3477,8 +3779,7 @@ int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1) diff_free_filepair(q->queue[i]); free(q->queue); - q->queue = NULL; - q->nr = q->alloc = 0; + DIFF_QUEUE_CLEAR(q); return result; } @@ -3555,8 +3856,9 @@ void diff_flush(struct diff_options *options) show_dirstat(options); if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) { - for (i = 0; i < q->nr; i++) - diff_summary(options->file, q->queue[i]); + for (i = 0; i < q->nr; i++) { + diff_summary(options, q->queue[i]); + } separator++; } @@ -3606,8 +3908,7 @@ void diff_flush(struct diff_options *options) diff_free_filepair(q->queue[i]); free_queue: free(q->queue); - q->queue = NULL; - q->nr = q->alloc = 0; + DIFF_QUEUE_CLEAR(q); if (options->close_file) fclose(options->file); @@ -3629,8 +3930,7 @@ static void diffcore_apply_filter(const char *filter) int i; struct diff_queue_struct *q = &diff_queued_diff; struct diff_queue_struct outq; - outq.queue = NULL; - outq.nr = outq.alloc = 0; + DIFF_QUEUE_CLEAR(&outq); if (!filter) return; @@ -3698,8 +3998,7 @@ static void diffcore_skip_stat_unmatch(struct diff_options *diffopt) int i; struct diff_queue_struct *q = &diff_queued_diff; struct diff_queue_struct outq; - outq.queue = NULL; - outq.nr = outq.alloc = 0; + DIFF_QUEUE_CLEAR(&outq); for (i = 0; i < q->nr; i++) { struct diff_filepair *p = q->queue[i]; @@ -3760,6 +4059,12 @@ void diffcore_fix_diff_index(struct diff_options *options) void diffcore_std(struct diff_options *options) { + /* We never run this function more than one time, because the + * rename/copy detection logic can only run once. + */ + if (diff_queued_diff.run) + return; + if (options->skip_stat_unmatch) diffcore_skip_stat_unmatch(options); if (options->break_opt != -1) @@ -3779,6 +4084,8 @@ void diffcore_std(struct diff_options *options) DIFF_OPT_SET(options, HAS_CHANGES); else DIFF_OPT_CLR(options, HAS_CHANGES); + + diff_queued_diff.run = 1; } int diff_result_code(struct diff_options *opt, int status) @@ -3932,3 +4239,47 @@ static char *run_textconv(const char *pgm, struct diff_filespec *spec, return strbuf_detach(&buf, outsize); } + +size_t fill_textconv(struct userdiff_driver *driver, + struct diff_filespec *df, + char **outbuf) +{ + size_t size; + + if (!driver || !driver->textconv) { + if (!DIFF_FILE_VALID(df)) { + *outbuf = ""; + return 0; + } + if (diff_populate_filespec(df, 0)) + die("unable to read files to diff"); + *outbuf = df->data; + return df->size; + } + + if (driver->textconv_cache) { + *outbuf = notes_cache_get(driver->textconv_cache, df->sha1, + &size); + if (*outbuf) + return size; + } + + *outbuf = run_textconv(driver->textconv, df, &size); + if (!*outbuf) + die("unable to read files to diff"); + + if (driver->textconv_cache) { + /* ignore errors, as we might be in a readonly repository */ + notes_cache_put(driver->textconv_cache, df->sha1, *outbuf, + size); + /* + * we could save up changes and flush them all at the end, + * but we would need an extra call after all diffing is done. + * Since generating a cache entry is the slow path anyway, + * this extra overhead probably isn't a big deal. + */ + notes_cache_write(driver->textconv_cache); + } + + return size; +}