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/*
http://github.com/isaacs/npm/issues/issue/7
npm update [pkg]
Does the following:
1. check for a new version of pkg
2. if not found, then quit
3. install new version of pkg
4. For each other version of pkg, for each dependent in
other version's dependents folder, if the new version
would satisfy the dependency as well, update other
version's dependent's dependency links to point at the
new version
5. If no dependents are left, then remove old version
If no packages are specified, then run for all installed
packages.
Depending on config value, update-dependents, run steps 4-5
after installation
* always - Run an update after every install, so as to
minimize the different number of versions of things.
* true - Default, run if newly installed version is
the highest version number (that is, don't downgrade
by default)
* false - Don't run "update" automatically after
installation.
*/
module.exports = update
update.usage = "npm update [pkg]"
var chain = require("./utils/chain")
, log = require("./utils/log")
, npm = require("../npm")
, semver = require("./utils/semver")
, lifecycle = require("./utils/lifecycle")
function update (args, cb) {
npm.commands.outdated(args, true, function (er, updates) {
if (er) return log.er(cb, "failed to find updates")(er)
if (!updates || Object.keys(updates).length === 0) return log(
"Nothing to update", "update", cb)
installUpdates(updates, cb)
})
}
function installUpdates (updates, cb) {
npm.config.set("update-dependents", true)
var installList = []
, updateList = []
, preChain = []
, postChain = []
, fullList = []
updates.forEach(function (u) {
if (u.have.indexOf(u.latest) === -1) {
installList.push(u.name+"@"+u.latest)
} else {
updateList.push(u.name+"@"+u.latest)
}
fullList.push(u.name+"@"+u.latest)
preChain.push([lifecycle, u.pkg, "preupdate"])
postChain.push( [lifecycle, u.pkg, "update"]
, [lifecycle, u.pkg, "postupdate"]
)
})
cb = (function (cb) { return function (er) {
log(fullList.join(" "), er ? "failed to update" : "updated")
cb(er)
}})(cb)
log(fullList.join(" "), "updates")
chain(preChain.concat(function (er) {
if (er) return cb(er)
if (installList.length > 0) {
return npm.commands.install(installList, function (er) {
if (er) return log.er(cb, "install failed "+installList)(er)
updateAndActivate(updateList, fullList, postChain, cb)
})
}
updateAndActivate(updateList, fullList, postChain, cb)
}))
}
function updateAndActivate (updateList, fullList, postChain, cb) {
npm.commands["update-dependents"](updateList, function (er) {
if (er) return log.er(cb, "update failed "+updateList)(er)
npm.commands.activate(fullList, function (er) {
if (er) return cb(er)
chain(postChain.concat(cb))
})
})
}
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