从Node.js中的另一个绝对路径中减去一个绝对路径

Question

I have two paths in Node.js, eg:

var pathOne = '/var/www/example.com/scripts';
var pathTwo = '/var/www/example.com/scripts/foo/foo.js';

How do I subtract one path from another in order to obtain a relative path?

subtractPath(pathTwo, pathOne); // => 'foo/foo.js'

Is there a module that does this according to all necessary URL rules or do I better use some simple string manipulations?

Answer 1

Not sure what you mean by "according to all necessary URL rules", but it seems you should be able to just use path.relative ;

> var pathOne = '/var/www/example.com/scripts';
> var pathTwo = '/var/www/example.com/scripts/foo/foo.js';

> path.relative(pathOne, pathTwo)
'foo/foo.js'

> path.relative(pathTwo, pathOne)
'../..'

Answer 2

You can do that easily with a regex:

var pathOne = /^\/your\/path\//
var pathTwo = '/your/path/appendix'.replace(pathOne, '');

This way you can force it to be at the start of the second path (using ^ ) and it won't be erased if it isn't an exact match.

Your example would be:

var pathOne = /^\/var\/www\/example.com\/scripts\//;
var pathTwo = '/var/www/example.com/scripts/foo/foo.js'.replace(pathOne, '');

It should return: foo/foo.js .