grep: add a grep.patternType configuration setting

The grep.extendedRegexp configuration setting enables the -E flag on grep
by default but there are no equivalents for the -G, -F and -P flags.

Rather than adding an additional setting for grep.fooRegexp for current
and future pattern matching options, add a grep.patternType setting that
can accept appropriate values for modifying the default grep pattern
matching behavior. The current values are "basic", "extended", "fixed",
"perl" and "default" for setting -G, -E, -F, -P and the default behavior
respectively.

When grep.patternType is set to a value other than "default", the
grep.extendedRegexp setting is ignored. The value of "default" restores
the current default behavior, including the grep.extendedRegexp
behavior.

Signed-off-by: J Smith <dark.panda@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/grep.h b/grep.h
index ed7de6bec8..75afb7b105 100644
--- a/grep.h
+++ b/grep.h
@@ -58,6 +58,14 @@ enum grep_expr_node {
 	GREP_NODE_OR
 };
 
+enum grep_pattern_type {
+	GREP_PATTERN_TYPE_UNSPECIFIED = 0,
+	GREP_PATTERN_TYPE_BRE,
+	GREP_PATTERN_TYPE_ERE,
+	GREP_PATTERN_TYPE_FIXED,
+	GREP_PATTERN_TYPE_PCRE
+};
+
 struct grep_expr {
 	enum grep_expr_node node;
 	unsigned hit;
@@ -103,6 +111,8 @@ struct grep_opt {
 	int max_depth;
 	int funcname;
 	int funcbody;
+	int extended_regexp_option;
+	int pattern_type_option;
 	char color_context[COLOR_MAXLEN];
 	char color_filename[COLOR_MAXLEN];
 	char color_function[COLOR_MAXLEN];