Detect the indentation of code
Pass in a string of any kind of text and get the indentation.
$ npm install --save detect-indent
Here we modify a JSON file while persisting the indentation:
var fs = require('fs'); var detectIndent = require('detect-indent'); /* { "ilove": "pizza" } */ var file = fs.readFileSync('foo.json', 'utf8'); // tries to detect the indentation and falls back to a default if it can't var indent = detectIndent(file).indent || ' '; var json = JSON.parse(file); json.ilove = 'unicorns'; fs.writeFileSync('foo.json', JSON.stringify(json, null, indent)); /* { "ilove": "unicorns" } */
Accepts a string and returns an object with stats about the indentation:
amount
{number} - Amount of indentation, e.g. 2
type
{string|null} - Type of indentation. Possible values are tab
, space
or null
if no indentation is detectedindent
{string} - Actual indentationThe current algorithm looks for the most common difference between two consecutive non-empty lines.
In the following example, even if the 4-space indentation is used 3 times whereas the 2-space one is used 2 times, it is detected as less used because there were only 2 differences with this value instead of 4 for the 2-space indentation:
html { box-sizing: border-box; } body { background: gray; } p { line-height: 1.3em; margin-top: 1em; text-indent: 2em; }
Furthermore, if there are more than one most used difference, the indentation with the most lines is selected.
In the following example, the indentation is detected as 4-spaces:
body { background: gray; } p { line-height: 1.3em; margin-top: 1em; text-indent: 2em; }
MIT © Sindre Sorhus