grep: add --heading

[thirdparty/git.git] / builtin / grep.c

diff --git a/builtin/grep.c b/builtin/grep.c
index 931eee0d750cd8662347e2a7c8e8a89d23228e17..cccf8da6d2a600154536ea642250699d9356f148 100644 (file)
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -93,8 +93,7 @@ static pthread_cond_t cond_write;
 /* Signalled when we are finished with everything. */
 static pthread_cond_t cond_result;
 
-static int print_hunk_marks_between_files;
-static int printed_something;
+static int skip_first_line;
 
 static void add_work(enum work_type type, char *name, void *id)
 {
@@ -160,10 +159,20 @@ static void work_done(struct work_item *w)
            todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
                w = &todo[todo_done];
                if (w->out.len) {
-                       if (print_hunk_marks_between_files && printed_something)
-                               write_or_die(1, "--\n", 3);
-                       write_or_die(1, w->out.buf, w->out.len);
-                       printed_something = 1;
+                       const char *p = w->out.buf;
+                       size_t len = w->out.len;
+
+                       /* Skip the leading hunk mark of the first file. */
+                       if (skip_first_line) {
+                               while (len) {
+                                       len--;
+                                       if (*p++ == '\n')
+                                               break;
+                               }
+                               skip_first_line = 0;
+                       }
+
+                       write_or_die(1, p, len);
                }
                free(w->name);
                free(w->identifier);
@@ -753,6 +762,15 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
        int i;
        int dummy;
        int use_index = 1;
+       enum {
+               pattern_type_unspecified = 0,
+               pattern_type_bre,
+               pattern_type_ere,
+               pattern_type_fixed,
+               pattern_type_pcre,
+       };
+       int pattern_type = pattern_type_unspecified;
+
        struct option options[] = {
                OPT_BOOLEAN(0, "cached", &cached,
                        "search in index instead of in the work tree"),
@@ -774,13 +792,18 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
                        "descend at most <depth> levels", PARSE_OPT_NONEG,
                        NULL, 1 },
                OPT_GROUP(""),
-               OPT_BIT('E', "extended-regexp", &opt.regflags,
-                       "use extended POSIX regular expressions", REG_EXTENDED),
-               OPT_NEGBIT('G', "basic-regexp", &opt.regflags,
-                       "use basic POSIX regular expressions (default)",
-                       REG_EXTENDED),
-               OPT_BOOLEAN('F', "fixed-strings", &opt.fixed,
-                       "interpret patterns as fixed strings"),
+               OPT_SET_INT('E', "extended-regexp", &pattern_type,
+                           "use extended POSIX regular expressions",
+                           pattern_type_ere),
+               OPT_SET_INT('G', "basic-regexp", &pattern_type,
+                           "use basic POSIX regular expressions (default)",
+                           pattern_type_bre),
+               OPT_SET_INT('F', "fixed-strings", &pattern_type,
+                           "interpret patterns as fixed strings",
+                           pattern_type_fixed),
+               OPT_SET_INT('P', "perl-regexp", &pattern_type,
+                           "use Perl-compatible regular expressions",
+                           pattern_type_pcre),
                OPT_GROUP(""),
                OPT_BOOLEAN('n', "line-number", &opt.linenum, "show line numbers"),
                OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
@@ -799,6 +822,10 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
                OPT_BOOLEAN('c', "count", &opt.count,
                        "show the number of matches instead of matching lines"),
                OPT__COLOR(&opt.color, "highlight matches"),
+               OPT_BOOLEAN(0, "break", &opt.file_break,
+                       "print empty line between matches from different files"),
+               OPT_BOOLEAN(0, "heading", &opt.heading,
+                       "show filename only once above matches from same file"),
                OPT_GROUP(""),
                OPT_CALLBACK('C', NULL, &opt, "n",
                        "show <n> context lines before and after matches",
@@ -886,6 +913,28 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
                             PARSE_OPT_KEEP_DASHDASH |
                             PARSE_OPT_STOP_AT_NON_OPTION |
                             PARSE_OPT_NO_INTERNAL_HELP);
+       switch (pattern_type) {
+       case pattern_type_fixed:
+               opt.fixed = 1;
+               opt.pcre = 0;
+               break;
+       case pattern_type_bre:
+               opt.fixed = 0;
+               opt.pcre = 0;
+               opt.regflags &= ~REG_EXTENDED;
+               break;
+       case pattern_type_ere:
+               opt.fixed = 0;
+               opt.pcre = 0;
+               opt.regflags |= REG_EXTENDED;
+               break;
+       case pattern_type_pcre:
+               opt.fixed = 0;
+               opt.pcre = 1;
+               break;
+       default:
+               break; /* nothing */
+       }
 
        if (use_index && !startup_info->have_repository)
                /* die the same way as if we did it at the beginning */
@@ -925,16 +974,14 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
                die(_("no pattern given."));
        if (!opt.fixed && opt.ignore_case)
                opt.regflags |= REG_ICASE;
-       if ((opt.regflags != REG_NEWLINE) && opt.fixed)
-               die(_("cannot mix --fixed-strings and regexp"));
 
 #ifndef NO_PTHREADS
        if (online_cpus() == 1 || !grep_threads_ok(&opt))
                use_threads = 0;
 
        if (use_threads) {
-               if (opt.pre_context || opt.post_context)
-                       print_hunk_marks_between_files = 1;
+               if (opt.pre_context || opt.post_context || opt.file_break)
+                       skip_first_line = 1;
                start_threads(&opt);
        }
 #else