* first action! (#1)

node_modules/npm-check-updates/lib/package-managers/npm.js

@@ -0,0 +1,188 @@
+'use strict';
+const _ = require('lodash');
+const cint = require('cint');
+const semver = require('semver');
+const versionUtil  = require('../version-util.js');
+const spawn        = require('spawn-please');
+const pacote = require('pacote');
+
+// needed until pacote supports full npm config compatibility
+// See: https://github.com/zkat/pacote/issues/156
+const npmConfig = {};
+require('libnpmconfig').read().forEach((value, key) => {
+    // replace env ${VARS} in strings with the process.env value
+    npmConfig[key] = typeof value !== 'string' ?
+        value :
+        value.replace(/\${([^}]+)}/, (_, envVar) =>
+            process.env[envVar]
+        );
+});
+npmConfig.cache = false;
+
+/** Parse JSON and throw an informative error on failure.
+ * @param result Data to be parsed
+ * @param data { command, packageName }
+*/
+function parseJson(result, data) {
+    let json;
+    // use a try-catch instead of .catch to avoid re-catching upstream errors
+    try {
+        json = JSON.parse(result);
+    } catch (err) {
+        throw new Error(`Expected JSON from "${data.command}". This could be due to npm instability${data.packageName ? ` or problems with the ${data.packageName} package` : ''}.\n\n${result}`);
+    }
+    return json;
+}
+
+/**
+ * @param packageName   Name of the package
+ * @param field         Field such as "versions" or "dist-tags.latest" are parsed from the pacote result (https://www.npmjs.com/package/pacote#packument)
+ * @Returns             Promised result
+ */
+function view(packageName, field, currentVersion) {
+    if (currentVersion && (!semver.validRange(currentVersion) || versionUtil.isWildCard(currentVersion))) {
+        return Promise.resolve();
+    }
+
+    npmConfig['full-metadata'] = field === 'time';
+
+    return pacote.packument(packageName, npmConfig).then(result => {
+        if (field.startsWith('dist-tags.')) {
+            const split = field.split('.');
+            if (result[split[0]]) {
+                return result[split[0]][split[1]];
+            }
+        } else if (field === 'versions') {
+            return Object.keys(result[field]);
+        } else {
+            return result[field];
+        }
+    });
+}
+
+/**
+ * @param versions  Array of all available versions
+ * @Returns         An array of versions with the release versions filtered out
+ */
+function filterOutPrereleaseVersions(versions) {
+    return _.filter(versions, _.negate(isPre));
+}
+
+/**
+ * @param            version
+ * @Returns          True if the version is any kind of prerelease: alpha, beta, rc, pre
+ */
+function isPre(version) {
+    return versionUtil.getPrecision(version) === 'release';
+}
+
+
+/** Spawn npm requires a different command on Windows. */
+function spawnNpm(args, npmOptions={}, spawnOptions={}) {
+    const cmd = process.platform === 'win32'? 'npm.cmd' : 'npm';
+
+    const fullArgs = [].concat(
+        args,
+        npmOptions.global ? '--global' : [],
+        npmOptions.prefix ? `--prefix=${npmOptions.prefix}` : [],
+        '--depth=0',
+        '--json'
+    );
+    return spawn(cmd, fullArgs, spawnOptions);
+}
+
+/** Get platform-specific default prefix to pass on to npm.
+ * @param options.global
+ * @param options.prefix
+*/
+function defaultPrefix(options) {
+
+    if (options && options.prefix) {
+        return Promise.resolve(options.prefix);
+    }
+
+    const cmd = process.platform === 'win32'? 'npm.cmd' : 'npm';
+
+    return spawn(cmd, ['config', 'get', 'prefix']).then(prefix => {
+        // FIX: for ncu -g doesn't work on homebrew or windows #146
+        // https://github.com/tjunnone/npm-check-updates/issues/146
+        return options.global && prefix.match('Cellar') ? '/usr/local' :
+
+            // Workaround: get prefix on windows for global packages
+            // Only needed when using npm api directly
+            process.platform === 'win32' && options.global && !process.env.prefix ?
+                `${process.env.AppData}\\npm` :
+                null;
+    });
+}
+
+module.exports = {
+
+    /**
+     * @options.cwd (optional)
+     * @options.global (optional)
+     * @options.prefix (optional)
+    */
+    list(options={}) {
+
+        return spawnNpm('ls', options, options.cwd ? {cwd: options.cwd, rejectOnError: false} : {rejectOnError: false})
+            .then(result => {
+                const json = parseJson(result, {
+                    command: 'npm ls'
+                });
+                return cint.mapObject(json.dependencies, (name, info) =>
+                    // unmet peer dependencies have a different structure
+                    cint.keyValue(name, info.version || (info.required && info.required.version))
+                );
+            });
+    },
+
+    latest(packageName, currentVersion, pre) {
+        return view(packageName, 'dist-tags.latest', currentVersion)
+            .then(version => {
+                // if latest is not a prerelease version, return it
+                // if latest is a prerelease version and --pre is specified, return it
+                if (!isPre(version) || pre) {
+                    return version;
+                // if latest is a prerelease version and --pre is not specified, find the next
+                // version that is not a prerelease
+                } else {
+                    return view(packageName, 'versions', currentVersion)
+                        .then(filterOutPrereleaseVersions)
+                        .then(_.last);
+                }
+            });
+    },
+
+    newest(packageName, currentVersion, pre) {
+        return view(packageName, 'time', currentVersion)
+            .then(_.keys)
+            .then(_.partialRight(_.pullAll, ['modified', 'created']))
+            .then(versions => {
+                return _.last(pre ? versions : filterOutPrereleaseVersions(versions));
+            });
+    },
+
+    greatest(packageName, currentVersion, pre) {
+        return view(packageName, 'versions', currentVersion)
+            .then(versions => {
+                return _.last(pre ? versions : filterOutPrereleaseVersions(versions));
+            });
+    },
+
+    greatestMajor(packageName, currentVersion, pre) {
+        return view(packageName, 'versions', currentVersion).then(versions => {
+            const resultVersions = pre ? versions : filterOutPrereleaseVersions(versions);
+            return versionUtil.findGreatestByLevel(resultVersions, currentVersion, 'major');
+        });
+    },
+
+    greatestMinor(packageName, currentVersion, pre) {
+        return view(packageName, 'versions', currentVersion).then(versions => {
+            const resultVersions = pre ? versions : filterOutPrereleaseVersions(versions);
+            return versionUtil.findGreatestByLevel(resultVersions, currentVersion, 'minor');
+        });
+    },
+
+    defaultPrefix
+};