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For example awk '{print substr($0,2,3)}' vs rew '{n2-4}'

Add conditionals Regexp to filters

Add conditionals evaluation with Regexp to filters similar to case statement in shell scripts.

Syntax Example

Using @ as conditional symbol (for avoiding mismatch with regexp symbols):

# Example with Path filter:
{f@\d+:number@[a-z]+:lower@[A-Z]:upper:mixed}

# Example with Regexp filter:
{=\w+@\d+:number@[a-z]+:lower@[A-Z]:upper:mixed}

Syntax Example

# Example with Path filter:
echo '123.txt' | rew '{f@\d+:number@[a-z]+:lower@[A-Z]:UPPER:mixed}' # Will print 'number.txt'
echo 'name.txt' | rew '{f@\d+:number@[a-z]+:lower@[A-Z]:UPPER:mixed}' # Will print 'lower.txt'
echo 'OUTPUT.txt' | rew '{f@\d+:number@[a-z]+:lower@[A-Z]:UPPER:mixed}' # Will print 'UPPER.txt'
echo 'file123.txt' | rew '{f@\d+:number@[a-z]+:lower@[A-Z]:UPPER:mixed}' # Will print 'mixed.png'

# Example with Regexp filter:
echo 'file123.txt' | rew '{=\w+@\d+:number@[a-z]+:lower@[A-Z]:UPPER:mixed}' # Will print 'file-number.txt'
echo 'file123.txt' | rew '{=\w+@\d+:number@[a-z]+:lower@[A-Z]:UPPER:mixed}' # Will print 'lower123.txt'
echo 'smallBIG.txt' | rew '{=\w+@\d+:number@[a-z]+:lower@[A-Z]:UPPER:mixed}' # Will print 'smallUPPER.LOG'
echo 'file123+456.png' | rew '{=\w+@\d+:number@[a-z]+:lower@[A-Z]:UPPER:mixed}' # Will print 'mixed+456.png'

Currently {n2-5} means substring from 2nd to 5th character (inclusive).

The same could be written using an alternative syntax {n2+3} ... substring from 2nd character with length 3.

Use clap App#help_heading (currently not working when using derive macros).

Sections:

• Input
• Output
• Pattern (Processing, Miscellaneous, ...)
• Help

New filters

• {oN:S} - Split input value using separator S, output N-th field.
• {oN} - Split input value using default separator (tab), output N-th field.
  • o = forward indexing / O = backward indexing
• {qN:S} - Like o but separator is a regular expression

New cli options

• -f, --field-separator <string> - Set default separator for $ flilter

Intercept Clap initialization and use common::help::highlight_help to add extra colors to app/args description.

pub trait Options: Clap {
    fn parse_with_highlight() -> Self {
        let mut app = <Self as IntoApp>::into_app();

        // Modify app long_about
        if let Some(value) = app.get_about() {
            let mut buffer = Buffer::ansi();
            highlight_help(&mut buffer, value).unwrap();
            let result = std::str::from_utf8(buffer.as_slice()).unwrap();
            app = app.long_about(result.to_string());
        }

        // Modify app.args. long_about...

        <Self as FromArgMatches>::from_arg_matches(&app.get_matches())
    }
}

Instead of a single executable rew with all of the filtering functionality, let's split the project into more smaller cli tools, where every tool does one separate thing.

• Previous filters will be implemented as separate rew subcommands. For example:
  • t filter becomes rew trim [-s|--start] [-e|--end] subcommand.
  • r filter becomes rew replace <what> [replacement] subcommand.
  • c filter becomes rew seq subcommand.
  • C filter becomes rew parent | rew count where parent subcommand prints parent directory and count subcommand print number of occurrences of input lines.
• Pipeline composition will be done using rew x subcommand:
  • Former usage: rew 'img_{C}.{e|l|r:e}'
  • New usage: rew 'img_{seq}.{ext | lower | replace e}'
• rew will run {a | b | ...c} pipelines in separate threads
• Every pipeline will consume/produce lines.
• Every subcommand will support -0, --null flag to process NUL separated lines.
• There will be REW_NULL environment variable to enable -0, --null behavior globally.
• Former cli options for custom input/output line separator will be implemented as a separate subcommands split and join.
• Alternative output modes (diff/json lines) will not be supported anymore.
• Auxiliary mvb/cpb tools will be dropped in favor of generation of executable shell code.

Generate using https://rust-cli.github.io/book/in-depth/docs.html