diff options
| -rw-r--r-- | diff.c | 64 | ||||
| -rwxr-xr-x | t/t4015-diff-whitespace.sh | 7 |
2 files changed, 55 insertions, 16 deletions
@@ -1149,7 +1149,6 @@ struct checkdiff_t { struct diff_options *o; unsigned ws_rule; unsigned status; - int trailing_blanks_start; }; static int is_conflict_marker(const char *line, unsigned long len) @@ -1193,10 +1192,6 @@ static void checkdiff_consume(void *priv, char *line, unsigned long len) if (line[0] == '+') { unsigned bad; data->lineno++; - if (!ws_blank_line(line + 1, len - 1, data->ws_rule)) - data->trailing_blanks_start = 0; - else if (!data->trailing_blanks_start) - data->trailing_blanks_start = data->lineno; if (is_conflict_marker(line + 1, len - 1)) { data->status |= 1; fprintf(data->o->file, @@ -1216,14 +1211,12 @@ static void checkdiff_consume(void *priv, char *line, unsigned long len) data->o->file, set, reset, ws); } else if (line[0] == ' ') { data->lineno++; - data->trailing_blanks_start = 0; } else if (line[0] == '@') { char *plus = strchr(line, '+'); if (plus) data->lineno = strtol(plus, NULL, 10) - 1; else die("invalid diff"); - data->trailing_blanks_start = 0; } } @@ -1437,6 +1430,44 @@ static const struct funcname_pattern_entry *diff_funcname_pattern(struct diff_fi return NULL; } +static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule) +{ + char *ptr = mf->ptr; + long size = mf->size; + int cnt = 0; + + if (!size) + return cnt; + ptr += size - 1; /* pointing at the very end */ + if (*ptr != '\n') + ; /* incomplete line */ + else + ptr--; /* skip the last LF */ + while (mf->ptr < ptr) { + char *prev_eol; + for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--) + if (*prev_eol == '\n') + break; + if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule)) + break; + cnt++; + ptr = prev_eol - 1; + } + return cnt; +} + +static int adds_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2, unsigned ws_rule) +{ + int l1, l2, at; + l1 = count_trailing_blank(mf1, ws_rule); + l2 = count_trailing_blank(mf2, ws_rule); + if (l2 <= l1) + return 0; + /* starting where? */ + at = count_lines(mf1->ptr, mf1->size); + return (at - l1) + 1; /* the line number counts from 1 */ +} + static void builtin_diff(const char *name_a, const char *name_b, struct diff_filespec *one, @@ -1650,15 +1681,16 @@ static void builtin_checkdiff(const char *name_a, const char *name_b, ecb.priv = &data; xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb); - if ((data.ws_rule & WS_BLANK_AT_EOF) && - data.trailing_blanks_start) { - static char *err; - - if (!err) - err = whitespace_error_string(WS_BLANK_AT_EOF); - fprintf(o->file, "%s:%d: %s\n", - data.filename, data.trailing_blanks_start, err); - data.status = 1; /* report errors */ + if (data.ws_rule & WS_BLANK_AT_EOF) { + int blank_at_eof = adds_blank_at_eof(&mf1, &mf2, data.ws_rule); + if (blank_at_eof) { + static char *err; + if (!err) + err = whitespace_error_string(WS_BLANK_AT_EOF); + fprintf(o->file, "%s:%d: %s.\n", + data.filename, blank_at_eof, err); + data.status = 1; /* report errors */ + } } } free_and_return: diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh index a5d446157..e0b481d42 100755 --- a/t/t4015-diff-whitespace.sh +++ b/t/t4015-diff-whitespace.sh @@ -341,6 +341,13 @@ test_expect_success 'checkdiff detects new trailing blank lines (1)' ' git diff --check | grep "new blank line" ' +test_expect_success 'checkdiff detects new trailing blank lines (2)' ' + { echo a; echo b; echo; echo; } >x && + git add x && + { echo a; echo; echo; echo; echo; } >x && + git diff --check | grep "new blank line" +' + test_expect_success 'checkdiff allows new blank lines' ' git checkout x && mv x y && |