npm-package-download-counts

Package Downloads

Get download counts for one or more packages.

Installation

$ npm install npm-package-download-counts

Usage

var counts = require( 'npm-package-download-counts' );

counts( options, clbk )

Get download counts for one or more packages.

var opts = {
    'packages': [
        'dstructs-matrix',
        'utils-copy',
        'unknown_package_name'
    ]
};
 
counts( opts, clbk );
 
function clbk( error, data ) {
    if ( error ) {
        throw error;
    }
    console.dir( data );
    /*
        [
            {
                "package": "dstructs-matrix",
                "data": [
                    ["2015-12-01T00:00:00.000Z",3295],
                    ["2015-12-02T00:00:00.000Z",5498],
                    ["2015-12-03T00:00:00.000Z",4771],
                    ...
                ]
            },
            {
                "package": "utils-copy",
                "data": [
                    ["2015-12-01T00:00:00.000Z",1003],
                    ["2015-12-02T00:00:00.000Z",809],
                    ["2015-12-03T00:00:00.000Z",946],
                    ...
                ]
            },
            {
                "package": "unknown_package_name",
                "data": null
            }
        ]
    */
}

The function accepts the following options:

• packages: array of package names (required).
• period: query period. May be either a keyword (e.g., 'last-month', 'last-week', 'last-day') or a date range (e.g., '2015-12-01:2016-01-01'). Default: 'last-month'.

By default, the function returns daily downloads for the last month. To return daily downloads for an alternative period, set the period option.

var opts = {
    'packages': [
        'dstructs-array',
        'flow-map',
        'utils-merge2'
    ],
    'period': '2015-11-01:2015-12-31'
};
 
counts( opts, clbk );

counts.factory( options, clbk )

Creates a reusable function.

var pkgs = [
    'dstructs-matrix',
    'compute-stdev',
    'compute-variance'
];
 
var get = counts.factory( {'packages':pkgs}, clbk );
 
get();
get();
get();
// ...

The factory method accepts the same options as counts().

Notes

• If the module encounters an application-level error (e.g., no network connection, malformed request, etc), that error is returned immediately to the provided callback.
• If a particular package is not present in downstream query results or simply does not exist, the package download count is null.
• Time values are in simplified ISO format (ISO 8601).
• A query period is not sanity checked. If counts are expected, ensure that the provided period is of the appropriate format and/or a recognized value.

Examples

var ls = require( 'npm-list-author-packages' );
var counts = require( 'npm-package-download-counts' );
 
// Get download counts for all author packages...
var opts = {
    'username': 'kgryte'
};
 
ls( opts, onList );
 
function onList( error, list ) {
    var opts;
    if ( error ) {
        throw error;
    }
    if ( !list.length ) {
        return;
    }
    opts = {
        'packages': list
    };
    counts( opts, onCounts );
}
 
function onCounts( error, data ) {
    if ( error ) {
        throw error;
    }
    console.dir( data );
}

To run the example code from the top-level application directory,

$ DEBUG=* node ./examples/index.js

---

CLI

Installation

To use the module as a general utility, install the module globally

$ npm install -g npm-package-download-counts

Usage

Usage: pkgcounts [options] pkg1 pkg2 ...
 
Options:
 
  -h,  --help                 Print this message.
  -V,  --version              Print the package version.
       --period period        Query period. May be either a keyword (e.g.,
                              'last-month','last-week','last-day') or a date
                              range (e.g., '2015-12-01:2016-01-01'). Default:
                              'last-month'.
       --format format        Output format: csv or json. Default: 'csv'.
       --delimiter delimiter  CSV column delimiter. Default: ','.

Notes

• If the output format is csv,
  • if unable to resolve the download counts for all specified packages, the process will write an error message to stderr and will not generate CSV output.
  • if at least one package has downloads within the specified period, the process will null fill the CSV columns for those packages without downloads.
• If the output format is json,
  • regardless of whether any package has downloads, the process will write newline-delimited JSON (ndjson) to stdout.
  • the counts (data) field for any package without downloads will be null.

Examples

$ DEBUG=* pkgcounts dstructs-matrix utils-copy
# => time,dstructs-matrix,utils-copy
# => 2015-12-01T00:00:00.000Z,3295,1003
# => 2015-12-02T00:00:00.000Z,5498,809
# => 2015-12-03T00:00:00.000Z,4771,946
# => ...

To output as newline-delimited JSON (ndjson), set the format option.

$ DEBUG=* pkgcounts --format=json dstructs-matrix utils-copy
# => {"dstructs-matrix":[[...],[...],...]}
# => {"utils-copy":[[...],[...],...]}

---

Tests

Unit

This repository uses tape for unit tests. To run the tests, execute the following command in the top-level application directory:

$ make test

All new feature development should have corresponding unit tests to validate correct functionality.

Test Coverage

This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:

$ make test-cov

Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,

$ make view-cov

Browser Support

This repository uses Testling for browser testing. To run the tests in a (headless) local web browser, execute the following command in the top-level application directory:

$ make test-browsers

To view the tests in a local web browser,

$ make view-browser-tests

---

License

MIT license.

Copyright

Copyright © 2016. Athan Reines.