diff options
Diffstat (limited to 'diff.c')
| -rw-r--r-- | diff.c | 178 |
1 files changed, 172 insertions, 6 deletions
@@ -358,12 +358,152 @@ static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one) return 0; } +struct diff_words_buffer { + mmfile_t text; + long alloc; + long current; /* output pointer */ + int suppressed_newline; +}; + +static void diff_words_append(char *line, unsigned long len, + struct diff_words_buffer *buffer) +{ + if (buffer->text.size + len > buffer->alloc) { + buffer->alloc = (buffer->text.size + len) * 3 / 2; + buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc); + } + line++; + len--; + memcpy(buffer->text.ptr + buffer->text.size, line, len); + buffer->text.size += len; +} + +struct diff_words_data { + struct xdiff_emit_state xm; + struct diff_words_buffer minus, plus; +}; + +static void print_word(struct diff_words_buffer *buffer, int len, int color, + int suppress_newline) +{ + const char *ptr; + int eol = 0; + + if (len == 0) + return; + + ptr = buffer->text.ptr + buffer->current; + buffer->current += len; + + if (ptr[len - 1] == '\n') { + eol = 1; + len--; + } + + fputs(diff_get_color(1, color), stdout); + fwrite(ptr, len, 1, stdout); + fputs(diff_get_color(1, DIFF_RESET), stdout); + + if (eol) { + if (suppress_newline) + buffer->suppressed_newline = 1; + else + putchar('\n'); + } +} + +static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len) +{ + struct diff_words_data *diff_words = priv; + + if (diff_words->minus.suppressed_newline) { + if (line[0] != '+') + putchar('\n'); + diff_words->minus.suppressed_newline = 0; + } + + len--; + switch (line[0]) { + case '-': + print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1); + break; + case '+': + print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0); + break; + case ' ': + print_word(&diff_words->plus, len, DIFF_PLAIN, 0); + diff_words->minus.current += len; + break; + } +} + +/* this executes the word diff on the accumulated buffers */ +static void diff_words_show(struct diff_words_data *diff_words) +{ + xpparam_t xpp; + xdemitconf_t xecfg; + xdemitcb_t ecb; + mmfile_t minus, plus; + int i; + + minus.size = diff_words->minus.text.size; + minus.ptr = xmalloc(minus.size); + memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size); + for (i = 0; i < minus.size; i++) + if (isspace(minus.ptr[i])) + minus.ptr[i] = '\n'; + diff_words->minus.current = 0; + + plus.size = diff_words->plus.text.size; + plus.ptr = xmalloc(plus.size); + memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size); + for (i = 0; i < plus.size; i++) + if (isspace(plus.ptr[i])) + plus.ptr[i] = '\n'; + diff_words->plus.current = 0; + + xpp.flags = XDF_NEED_MINIMAL; + xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc; + xecfg.flags = 0; + ecb.outf = xdiff_outf; + ecb.priv = diff_words; + diff_words->xm.consume = fn_out_diff_words_aux; + xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb); + + free(minus.ptr); + free(plus.ptr); + diff_words->minus.text.size = diff_words->plus.text.size = 0; + + if (diff_words->minus.suppressed_newline) { + putchar('\n'); + diff_words->minus.suppressed_newline = 0; + } +} + struct emit_callback { struct xdiff_emit_state xm; int nparents, color_diff; const char **label_path; + struct diff_words_data *diff_words; }; +static void free_diff_words_data(struct emit_callback *ecbdata) +{ + if (ecbdata->diff_words) { + /* flush buffers */ + if (ecbdata->diff_words->minus.text.size || + ecbdata->diff_words->plus.text.size) + diff_words_show(ecbdata->diff_words); + + if (ecbdata->diff_words->minus.text.ptr) + free (ecbdata->diff_words->minus.text.ptr); + if (ecbdata->diff_words->plus.text.ptr) + free (ecbdata->diff_words->plus.text.ptr); + free(ecbdata->diff_words); + ecbdata->diff_words = NULL; + } +} + const char *diff_get_color(int diff_use_color, enum color_diff ix) { if (diff_use_color) @@ -398,12 +538,31 @@ static void fn_out_consume(void *priv, char *line, unsigned long len) else { int nparents = ecbdata->nparents; int color = DIFF_PLAIN; - for (i = 0; i < nparents && len; i++) { - if (line[i] == '-') - color = DIFF_FILE_OLD; - else if (line[i] == '+') - color = DIFF_FILE_NEW; - } + if (ecbdata->diff_words && nparents != 1) + /* fall back to normal diff */ + free_diff_words_data(ecbdata); + if (ecbdata->diff_words) { + if (line[0] == '-') { + diff_words_append(line, len, + &ecbdata->diff_words->minus); + return; + } else if (line[0] == '+') { + diff_words_append(line, len, + &ecbdata->diff_words->plus); + return; + } + if (ecbdata->diff_words->minus.text.size || + ecbdata->diff_words->plus.text.size) + diff_words_show(ecbdata->diff_words); + line++; + len--; + } else + for (i = 0; i < nparents && len; i++) { + if (line[i] == '-') + color = DIFF_FILE_OLD; + else if (line[i] == '+') + color = DIFF_FILE_NEW; + } set = diff_get_color(ecbdata->color_diff, color); } if (len > 0 && line[len-1] == '\n') @@ -836,7 +995,12 @@ static void builtin_diff(const char *name_a, ecb.outf = xdiff_outf; ecb.priv = &ecbdata; ecbdata.xm.consume = fn_out_consume; + if (o->color_diff_words) + ecbdata.diff_words = + xcalloc(1, sizeof(struct diff_words_data)); xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb); + if (o->color_diff_words) + free_diff_words_data(&ecbdata); } free_ab_and_return: @@ -1697,6 +1861,8 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac) options->xdl_opts |= XDF_IGNORE_WHITESPACE; else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change")) options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE; + else if (!strcmp(arg, "--color-words")) + options->color_diff = options->color_diff_words = 1; else if (!strcmp(arg, "--no-renames")) options->detect_rename = 0; else |