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authorJunio C Hamano <gitster@pobox.com>2012-09-13 21:21:44 (GMT)
committerJunio C Hamano <gitster@pobox.com>2012-09-14 17:10:35 (GMT)
commit17bf35a3c7b46df7131681bcc5bee5f12e1caec4 (patch)
tree26c22e3e4dce563d22a840d6a9b2f144a2335b57 /builtin/grep.c
parent785ee4960c3d334cbc2b17ab74d2cebdf1b4db64 (diff)
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grep: teach --debug option to dump the parse tree
Our "grep" allows complex boolean expressions to be formed to match each individual line with operators like --and, '(', ')' and --not. Introduce the "--debug" option to show the parse tree to help people who want to debug and enhance it. Also "log" learns "--grep-debug" option to do the same. The command line parser to the log family is a lot more limited than the general "git grep" parser, but it has special handling for header matching (e.g. "--author"), and a parse tree is valuable when working on it. Note that "--all-match" is *not* any individual node in the parse tree. It is an instruction to the evaluator to check all the nodes in the top-level backbone have matched and reject a document as non-matching otherwise. Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin/grep.c')
-rw-r--r--builtin/grep.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/builtin/grep.c b/builtin/grep.c
index fe1726f..8aea00c 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -772,6 +772,9 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
"indicate hit with exit status without output"),
OPT_BOOLEAN(0, "all-match", &opt.all_match,
"show only matches from files that match all patterns"),
+ { OPTION_SET_INT, 0, "debug", &opt.debug, NULL,
+ "show parse tree for grep expression",
+ PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1 },
OPT_GROUP(""),
{ OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
"pager", "show matching files in the pager",