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line-info Build status

Gather information about a line based on content and cursor position.

This was built as part of commander-completion, a shell completion library for commander.js.

Getting Started

Install the module with: npm install line-info

var lineInfo = require('line-info');
  // git checkout|world 
  line: 'git checkoutworld',
  cursor: 12
/* Result is
  line: {
    value: 'git checkoutworld',
    index: 12, // 'git checkout'.length
    partialLeft: 'git checkout',
    partialRight: 'world'
  words: {
    value: ['git', 'checkoutworld'],
    index: 1, // Position of 'checkoutworld'
    partialLeft: ['git', 'checkout'],
    partialRight: ['world']
  word: {
    value: 'checkoutworld',
    index: 8, // 'checkout'.length
    partialLeft: 'checkout',
    partialRight: 'world'
// Accessed via `result.word.partialLeft`; // 'checkout' 


line-info exposes a single function via its module.exports


Collect info about a line given a set of shell completion parameters.


  • params Object - Container for additional parameters
    • line String - Input to analyze (e.g. npm publish)
    • cursor Number - Position of cursor within string (e.g. ec|ho hai has a cursor of 2)


  • retObj Object - Container for information
    • line Object - Container for params.line information
      • value String - Original input from params.line
      • index Number - Original cursor position from params.cursor
      • partialLeft String- Left section of line before cursor (e.g. 'npm pub' in npm pub|lish)
      • partialRight String- Right section of line after cursor (e.g. 'lish' in npm pub|lish)
    • words Object - Information about words in line
      • value String[] - Array of words in the params.line
      • index Number - Index of word containing cursor
      • partialLeft String[] - Array of words from retObj.line.partialLeft (e.g. ['npm', 'pub'] in npm pub|lish)
        • Word containing cursor will be broken up here
      • partialRight String[] - Array of words from retObj.line.partialRight (e.g. ['lish'] in npm pub|lish)
        • Word containing cursor will be broken up here
    • word Object - Information about word containing cursor
      • value String - Word containing cursor
      • index Number - Position of cursor within word
      • partialLeft String - Left section of word before cursor (e.g. 'pub' in npm pub|lish)
      • partialRight String - Right section of word after cursor (e.g. 'lish' in npm pub|lish)


In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint via grunt and test via npm test.


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As of Dec 17 2013, Todd Wolfson has released this repository and its contents to the public domain.

It has been released under the UNLICENSE.