Run a reduce over a collection of files, and save the result in another file.
If there is not more recent mtime than the reduction file, the reduce won't run.
Iterate over all npm docs in your npm cache,
and construct a table of reverse dependencies.
({$dependencie: {$dependant: count}} - count is the number of
versions of $dependant than depend on $dependency)
var mtr = require('mtime-reduce')
var reduce = mtr({
//selection of files you wish to reduce over.
glob: process.env.HOME +'/.npm/*/*package.json',
//file to save the accumulation in
filename: '/tmp/reverse-deps.json',
//encodign
encoding: 'json', //DON'T FORGET THIS IF IT'S JSON!
//initial value passed to reduce function.
initial: {},
//a reduce function - the same api as Array#reduce
reduce: function (acc, pkg) {
for(var dep in pkg.dependencies || {}) {
acc[dep] = acc[dep] || {}
acc[dep][pkg.name] = (acc[dep][pkg.name] || 0) + 1
}
return acc
}
})
//an async reduce function is returned.
//pass it a callback!
reduce (function (err, data) {
if(err) throw err
console.log(JSON.stringify(data, null, 2))
})MIT