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E.g., a+b will no longer be matched by anything. This is due to the
global usage of a modified list_all().
Also:
- Use different return types for different things (e.g. $RET_SUCCESS).
`- Both internally and externally (exit codes, documented in ctct(1)).
- Make --search-by-data more efficient.
`- One call to grep for all files.
`- The conjunction of the regexes still requires several calls.
- Rename functions to more speaking names.
- Document the function parameters.
- Add vi modelines.
- Use [[:alpha:]] instead of [A-Za-z] which appears to be the same but
more clear. Notably, both seem to include non-ASCII letters, for
example 'à'.
- Set nullglob option in the script to prevent errors for cases where
glob patterns would be used.
- Add a silent option ro check_syntax() (not used).
- Add a full_path option to list_all() (not used).
- Use return instead of exit in main().
- Remove one remaining usage of eval.
- Fix small format issue in ctct(1) (I -> B).
`- They are no longer, but it hardly harms to have this option.
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