grunt-newer: Check for newer @import .less files

gistfile1.js

//
// grunt-newer: 
// Check for newer @import .less files example
// See: https://github.com/tschaub/grunt-newer/issues/29
//
grunt.initConfig({
// ...
    newer: {
        options: {
            override: function(taskName, targetName, filePath, time, include) {
                if (taskName === 'less') {
                  // call include with `true` if there are newer imports          
                  checkForNewerImports(filePath, time, include);
                } else {
                  include(false);
                }
            }
        }
    }
// ...
});

var fs = require('fs');
var path = require('path');

function checkForNewerImports(lessFile, mTime, include) {
    fs.readFile(lessFile, "utf8", function(err, data) {
        var lessDir = path.dirname(lessFile),
            regex = /@import "(.+?)(\.less)?";/g,
            shouldInclude = false,                
            match;

        while ((match = regex.exec(data)) !== null) {
            // All of my less files are in the same directory,
            // other paths may need to be traversed for different setups...
            var importFile = lessDir + '/' + match[1] + '.less';
            if (fs.existsSync(importFile)) {
                var stat = fs.statSync(importFile);
                if (stat.mtime > mTime) {
                    shouldInclude = true;
                    break;
                }
            }
        }
        include(shouldInclude);
    });
}

Nice. The function should be named checkForNewerImports to be consistent with the config. Or change the config to match.

@tschaub thanks for catching that... had copied from two separate sources. Fixed and included some missing requires.

is that a stylus version? And how to use it?

I don't think this is a good solution, by checking the mTime, it results in compiling the script no matter what.

Helped me a lot, thanks!

Loved this, thanks. Looks like grunt-newer updated their API again for the override function:

https://github.com/tschaub/grunt-newer#optionsoverride

I forked and updated the gist here if you wanna take a look:

https://gist.github.com/migreva/2a926b95f25366da657c