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Improved error message when no search pattern is provided #527

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Improved error message when no search pattern is provided #527

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10 changes: 9 additions & 1 deletion src/ugrep.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6698,7 +6698,15 @@ void init(int argc, const char **argv)

// if no regex pattern is specified and no -e PATTERN and no -f FILE and not -Q, then exit with usage message
if (Static::arg_pattern == NULL && pattern_args.empty() && flag_file.empty() && !flag_query)
usage("no PATTERN specified: specify --match or an empty \"\" pattern to match all input");
usage(
"no search PATTERN specified.\n\n"
"Examples:\n"
" ugrep \"pattern\" .\n"
" ugrep \"\" . (match all lines)\n\n"
"For more help, run: ugrep --help"
);



// regex PATTERN should be a FILE argument when -Q or -e PATTERN is specified
if (!flag_match && Static::arg_pattern != NULL && (flag_query || !pattern_args.empty()))
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