grep/pcre2: factor out literal variable

Patterns that contain no wildcards and don't have to be case-folded are
literal.  Give this condition a name to increase the readability of the
boolean expression for enabling the option PCRE2_UTF.

Signed-off-by: René Scharfe <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: rscharfe

grep.c

@@ -362,6 +362,7 @@ static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt
 	int jitret;
 	int patinforet;
 	size_t jitsizearg;
+	int literal = !opt->ignore_case && (p->fixed || p->is_fixed);
 
 	/*
 	 * Call pcre2_general_context_create() before calling any
@@ -382,8 +383,7 @@ static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt
 		}
 		options |= PCRE2_CASELESS;
 	}
-	if (!opt->ignore_locale && is_utf8_locale() &&
-	    !(!opt->ignore_case && (p->fixed || p->is_fixed)))
+	if (!opt->ignore_locale && is_utf8_locale() && !literal)
 		options |= (PCRE2_UTF | PCRE2_MATCH_INVALID_UTF);
 
 #ifdef GIT_PCRE2_VERSION_10_36_OR_HIGHER