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var npm = require('npm');
var semver = require('semver');
var Immutable = require('immutable');
var Promise = require('../utils/promise');
var Plugin = require('../models/plugin');
var gitbook = require('../gitbook');
var npmIsReady;
/**
Initialize and prepare NPM
@return {Promise}
*/
function initNPM() {
if (npmIsReady) return npmIsReady;
npmIsReady = Promise.nfcall(npm.load, {
silent: true,
loglevel: 'silent'
});
return npmIsReady;
}
/**
Resolve a plugin dependency to a version
@param {PluginDependency} plugin
@return {Promise<String>}
*/
function resolveVersion(plugin) {
var npmId = Plugin.nameToNpmID(plugin.getName());
var requiredVersion = plugin.getVersion();
if (plugin.isGitDependency()) {
return Promise.resolve(requiredVersion);
}
return initNPM()
.then(function() {
return Promise.nfcall(npm.commands.view, [npmId + '@' + requiredVersion, 'engines'], true);
})
.then(function(versions) {
versions = Immutable.Map(versions).entrySeq();
var result = versions
.map(function(entry) {
return {
version: entry[0],
gitbook: (entry[1].engines || {}).gitbook
};
})
.filter(function(v) {
return v.gitbook && gitbook.satisfies(v.gitbook);
})
.sort(function(v1, v2) {
return semver.lt(v1.version, v2.version)? 1 : -1;
})
.get(0);
if (!result) {
return undefined;
} else {
return result.version;
}
});
}
module.exports = resolveVersion;
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