Splice path with Gulp-data - json

Question

How do I get the name of the parent folder using gulp-data? Currently I'm using the following:
In my front matter
---
title: 'some title'
----
from my gulp file:
function fm2json() {
return gulp.src('src/pages/**/*.html')
.pipe(require('gulp-gray-matter')())
.pipe($.data(function(file){
file.data.relative = file.relative,
file.data.basename = file.basename,
}))
.pipe($.pluck('data', 'new.json'))
.pipe($.data(function(file){
file.contents = new Buffer(JSON.stringify(file.data))
}))
.pipe(require('gulp-json-format')(2))
.pipe(gulp.dest('src/data'));
}
which outputs the following to new.json
[
{
"title":"some title"
"relative":"lesson01\\file.html"
"basename":"file.html"
},
{
"title":"some title 2"
"relative":"lesson02\\file2.html"
"basename":"file2.html"
}
]
I can't figure out how to just get the parent folder of the file so that relative would be "relative":"lesson01" and "relative":"lesson02".

Answer 1

It's not the most efficient way to do it. If it helps anyone this is what I ended up with.
function fm2json() {
return gulp.src('src/pages/**/*.html')
.pipe(require('gulp-gray-matter')())
.pipe($.data(function(file){
// What I ended up with
var relpath = file.relative;
var path = relpath.replace(/\\/g,"/"); //flip slashes
var split = path.split('/'); //split the path into an array
var parent = split[split.length - 2]; // find the array position
file.data.parent = parent,
file.data.file = file.basename,
file.data.path = path,
}))
.pipe($.pluck('data', 'new.json'))
.pipe($.data(function(file){
file.contents = new Buffer(JSON.stringify(file.data))
}))
.pipe(require('gulp-json-format')(2))
.pipe(gulp.dest('src/data'));
}