Hello, sorry for the late response. I was busy with other stuff.

In Web Essentials, we are calling less as a service to node-server: https://github.com/madskristensen/WebEssentials2013/blob/eea5cd4d82ab36c6fc7bab4e44fa123e11a3d723/EditorExtensions/Resources/server/services/srv-less.js#L52-L75.

Now, given the following LESS:

foo {
    + bar {
        color: lime;
        background-image: url('../7up-fido-dido.png');
    }
}

It generates:

foo + bar {
  color: lime;
  background-image: url(../7up-fido-dido.png);
}
/*# sourceMappingURL=Site.css.map */

Now, let's consider if filename: params.sourceFileName at line 28, points to c:\\project\\content\\less\\input.less and rootPath is set to path.basename(params.targetFileName) which points to c:\\project\\content\\less\\nested\\folder\\, the resultant CSS would be the same.

Also, if I add rootPath: path.basename(params.targetFileName) at line 57 (as a setting to toCSS) or line 28 (in less.Parser's settings), the result is still same.

However, the expected output in the latter case should be:

foo + bar {
  color: lime;
  background-image: url(../../../7up-fido-dido.png);
}
/*# sourceMappingURL=Site.css.map */

Is there any setting for this to generate URLs relative to target file (as opposed to input/source file)?

(For this matter, we need to carry out this post-processing step, using VS' CSS AST, which is a bit expensive op).

On a slightly different note, would be nice if the file and sources members of source-map JSON are also relative to each other to avoid this hack. We fixed the similar issue in libsass some time ago. The gist is:

SourceComment in CSS file should point to sourcemap-filename relative to CSS file path.
file in sourcemap JSON file should point to CSS file path relative to .map file path.
Each member in sources array in sourcemap JSON should point to source .less files, relative to .map file path.

Thanks in anticipation.

Custom-output-path-aware relative-URLs #2084

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