grep: move pattern-type bits support to top-level grep.[ch]

Switching between -E/-G/-P/-F correctly needs a lot more than just
flipping opt->regflags bit these days, and we have a nice helper
function buried in builtin/grep.c for the sole use of "git grep".

Extract it so that "log --grep" family can also use it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/grep.h b/grep.h
index 9aa1cc7e13..701c78459f 100644
--- a/grep.h
+++ b/grep.h
@@ -141,6 +141,8 @@ struct grep_opt {
 extern void init_grep_defaults(void);
 extern int grep_config(const char *var, const char *value, void *);
 extern void grep_init(struct grep_opt *, const char *prefix);
+void grep_set_pattern_type_option(enum grep_pattern_type, struct grep_opt *opt);
+void grep_commit_pattern_type(enum grep_pattern_type, struct grep_opt *opt);
 
 extern void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen, const char *origin, int no, enum grep_pat_token t);
 extern void append_grep_pattern(struct grep_opt *opt, const char *pat, const char *origin, int no, enum grep_pat_token t);