diff options
Diffstat (limited to 'diff.c')
| -rw-r--r-- | diff.c | 172 |
1 files changed, 131 insertions, 41 deletions
@@ -20,12 +20,13 @@ static int diff_use_color_default; static char diff_colors[][COLOR_MAXLEN] = { "\033[m", /* reset */ - "", /* normal */ - "\033[1m", /* bold */ - "\033[36m", /* cyan */ - "\033[31m", /* red */ - "\033[32m", /* green */ - "\033[33m" /* yellow */ + "", /* PLAIN (normal) */ + "\033[1m", /* METAINFO (bold) */ + "\033[36m", /* FRAGINFO (cyan) */ + "\033[31m", /* OLD (red) */ + "\033[32m", /* NEW (green) */ + "\033[33m", /* COMMIT (yellow) */ + "\033[41m", /* WHITESPACE (red background) */ }; static int parse_diff_color_slot(const char *var, int ofs) @@ -42,6 +43,8 @@ static int parse_diff_color_slot(const char *var, int ofs) return DIFF_FILE_NEW; if (!strcasecmp(var+ofs, "commit")) return DIFF_COMMIT; + if (!strcasecmp(var+ofs, "whitespace")) + return DIFF_WHITESPACE; die("bad config variable '%s'", var); } @@ -383,9 +386,89 @@ const char *diff_get_color(int diff_use_color, enum color_diff ix) return ""; } +static void emit_line(const char *set, const char *reset, const char *line, int len) +{ + if (len > 0 && line[len-1] == '\n') + len--; + fputs(set, stdout); + fwrite(line, len, 1, stdout); + puts(reset); +} + +static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len) +{ + int col0 = ecbdata->nparents; + int last_tab_in_indent = -1; + int last_space_in_indent = -1; + int i; + int tail = len; + int need_highlight_leading_space = 0; + const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE); + const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW); + + if (!*ws) { + emit_line(set, reset, line, len); + return; + } + + /* The line is a newly added line. Does it have funny leading + * whitespaces? In indent, SP should never precede a TAB. + */ + for (i = col0; i < len; i++) { + if (line[i] == '\t') { + last_tab_in_indent = i; + if (0 <= last_space_in_indent) + need_highlight_leading_space = 1; + } + else if (line[i] == ' ') + last_space_in_indent = i; + else + break; + } + fputs(set, stdout); + fwrite(line, col0, 1, stdout); + fputs(reset, stdout); + if (((i == len) || line[i] == '\n') && i != col0) { + /* The whole line was indent */ + emit_line(ws, reset, line + col0, len - col0); + return; + } + i = col0; + if (need_highlight_leading_space) { + while (i < last_tab_in_indent) { + if (line[i] == ' ') { + fputs(ws, stdout); + putchar(' '); + fputs(reset, stdout); + } + else + putchar(line[i]); + i++; + } + } + tail = len - 1; + if (line[tail] == '\n' && i < tail) + tail--; + while (i < tail) { + if (!isspace(line[tail])) + break; + tail--; + } + if ((i < tail && line[tail + 1] != '\n')) { + /* This has whitespace between tail+1..len */ + fputs(set, stdout); + fwrite(line + i, tail - i + 1, 1, stdout); + fputs(reset, stdout); + emit_line(ws, reset, line + tail + 1, len - tail - 1); + } + else + emit_line(set, reset, line + i, len - i); +} + static void fn_out_consume(void *priv, char *line, unsigned long len) { int i; + int color; struct emit_callback *ecbdata = priv; const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO); const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET); @@ -403,45 +486,52 @@ static void fn_out_consume(void *priv, char *line, unsigned long len) ; if (2 <= i && i < len && line[i] == ' ') { ecbdata->nparents = i - 1; - set = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO); + emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO), + reset, line, len); + return; } - else if (len < ecbdata->nparents) + + if (len < ecbdata->nparents) { set = reset; - else { - int nparents = ecbdata->nparents; - int color = DIFF_PLAIN; - 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); + emit_line(reset, reset, line, len); + return; } - if (len > 0 && line[len-1] == '\n') + + color = DIFF_PLAIN; + if (ecbdata->diff_words && ecbdata->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--; - fputs (set, stdout); - fwrite (line, len, 1, stdout); - puts (reset); + emit_line(set, reset, line, len); + return; + } + for (i = 0; i < ecbdata->nparents && len; i++) { + if (line[i] == '-') + color = DIFF_FILE_OLD; + else if (line[i] == '+') + color = DIFF_FILE_NEW; + } + + if (color != DIFF_FILE_NEW) { + emit_line(diff_get_color(ecbdata->color_diff, color), + reset, line, len); + return; + } + emit_add_line(reset, ecbdata, line, len); } static char *pprint_rename(const char *a, const char *b) |