Source Structure ``` folder
|----Sub-Folder-1
| |-a.js
| |-b.js
|----Sub-Folder-2
| |-c.js
|-d.js
|-e.js
```
Destination structure before running copy task ``` folder
|----Sub-Folder-1
| |-a.js
|-e.js
```
I need the destination folder to be exactly the same as src folder but I don't want to overwrite the existing files, like a.js and e.js in the above example already exist so they should not be touched, other files/folders should be created, so I want to recursively check inside 'folder' if a file exists or not and copy it if it doesn't exist. I have been using following filter for not overwriting single files filter: function (filepath) { return !(grunt.file.exists('dest')); } but 'folder consists several subdirectories and files so it is not feasible to write for every file. Please help in writing custom grunt task which can do this .
This can be achieved by adding custom logic inside the filter function of the grunt-contrib-copy target to carry out the following:
The following gists demonstrates how to achieve your requirement cross-platform:
Gruntfile.js
module.exports = function (grunt) {
'use strict';
var path = require('path'); // Load additional built-in node module.
grunt.loadNpmTasks('grunt-contrib-copy');
grunt.initConfig({
copy: {
non_existing: {
expand: true,
cwd: 'src/', // <-- Define as necessary.
src: [ '**/*.js' ],
dest: 'dist/', // <-- Define as necessary.
// Copy file only when it does not exist.
filter: function (filePath) {
// For cross-platform. When run on Windows any forward slash(s)
// defined in the `cwd` config path are replaced with backslash(s).
var srcDir = path.normalize(grunt.config('copy.non_existing.cwd'));
// Combine the `dest` config path value with the
// `filepath` value excluding the cwd` config path part.
var destPath = path.join(
grunt.config('copy.non_existing.dest'),
filePath.replace(srcDir, '')
);
// Returns false when the file exists.
return !(grunt.file.exists(destPath));
}
}
}
});
grunt.registerTask('default', [ 'copy:non_existing' ]);
};
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