Stdio filter

Makes it possible to take control over the output from scripts, and define what should be shown in the console.

Installation

npm i stdio-filter

Usage

echo "hello there" | cf

Files

• cf-all.txt This file will contain all output from the script (filtered, or not). Which is handy if the filtered output was relevant.
• cf-shown.txt This file will contain the unfiltered output from the script. Which is handy for reviewing the content that can be filtered.

Configuration

Stdio filter will look for the following configuration in the output folder.

• cf-ignore-prefix.txt The lines in this file will be treated as prefixes, that can be removed from the output.
• cf-ignore.txt Contains content that should be filtered, and hence not shown. Each line defines a line, that can be filtered.
• includeJson.js This file must export a function, that returns true or false for a given object. The object is created by parsing lines that contain json data.
• includeLine.js This function receives each line from the output, and must return a boolean indicating whether to show the line.

Tips

Filter stderr

Stderr is not given to the cf command by default. It's just shown in the console. But it's possible to redirect stderr to stdout, and then it will be filtered.

Here is how it's done in bash:

echo "hello there" 2>&1 | cf

Known issues

• Output folder is hardcoded.

Related work

• filter-console

License

MIT