From 0d527842b7633091158450d4dcda3ceb3547a636 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ahelenia=20Ziemia=C5=84ska?= Date: Sat, 23 Mar 2024 14:18:08 +0100 Subject: [PATCH] grep: improve errors for unmatched ( and ) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Imagine you want to grep for (. Easy: $ git grep '(' fatal: unmatched parenthesis uhoh. This is plainly wrong. Unless you know specifically that (a) git grep has expression groups and '(' ... ')' are used for them. (b) you can use -e '(' to explicitly say '(' is what you are looking for, not the beginning of a group. Similarly, $ git grep ')' fatal: incomplete pattern expression: ) is somehow worse. ")" is a complete regular expression pattern. Of course, the error wants to say "group" here. In this case it is also not "incomplete", it is unmatched. Make them say $ ./git grep '(' fatal: unmatched ( for expression group $ ./git grep ')' fatal: incomplete pattern expression group: ) which are clearer in indicating that it is not the expression that is wrong (since no pattern had been parsed at all), but rather that it is been misconstrued as a grouping operator. Link: https://bugs.debian.org/1051205 Signed-off-by: Ahelenia Ziemiańska Signed-off-by: Junio C Hamano --- grep.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/grep.c b/grep.c index 5f23d1a50c..ac34bfeafb 100644 --- a/grep.c +++ b/grep.c @@ -621,7 +621,7 @@ static struct grep_expr *compile_pattern_atom(struct grep_pat **list) *list = p->next; x = compile_pattern_or(list); if (!*list || (*list)->token != GREP_CLOSE_PAREN) - die("unmatched parenthesis"); + die("unmatched ( for expression group"); *list = (*list)->next; return x; default: @@ -792,7 +792,7 @@ void compile_grep_patterns(struct grep_opt *opt) if (p) opt->pattern_expression = compile_pattern_expr(&p); if (p) - die("incomplete pattern expression: %s", p->pattern); + die("incomplete pattern expression group: %s", p->pattern); if (opt->no_body_match && opt->pattern_expression) opt->pattern_expression = grep_not_expr(opt->pattern_expression);