From f9c9fcdc3b8ef845feddbcb9b41bb8ca8b025843 Mon Sep 17 00:00:00 2001
From: isaacs <i@izs.me>
Date: Mon, 2 Aug 2010 23:50:15 -0700
Subject: Add the update and update-dependents commands

---
 lib/update.js | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 lib/update.js

(limited to 'lib/update.js')

diff --git a/lib/update.js b/lib/update.js
new file mode 100644
index 000000000..27d642afc
--- /dev/null
+++ b/lib/update.js
@@ -0,0 +1,99 @@
+/*
+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, auto-update, 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
+
+var readInstalled = require("./utils/read-installed")
+  , chain = require("./utils/chain")
+  , log = require("./utils/log")
+  , registry = require("./utils/registry")
+  , npm = require("../npm")
+  , semver = require("./utils/semver")
+
+function update (args, cb) {
+  findUpdates(args, 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) {
+  log(updates, "install updates")
+  npm.config.set("auto-update", true)
+  var installList = []
+    , updateList = []
+  Object.keys(updates).forEach(function (i) {
+    var u = updates[i]
+    if (u.have.indexOf(u.latest) === -1) {
+      installList.push(i+"@"+u.latest)
+    } else {
+      updateList.push(i+"@"+u.latest)
+    }
+  })
+  log(installList, "update installList")
+  log(updateList, "update updateList")
+  npm.commands.install(installList, function (er) {
+    if (er) return log.er(cb, "install failed "+installList)(er)
+    npm.commands["update-dependents"](updateList, function (er) {
+      if (er) return log.er(cb, "update failed "+updateList)(er)
+      cb()
+    })
+  })
+}
+
+function findUpdates (args, cb) {
+  log(args, "findUpdates")
+  readInstalled(args, function (er, inst) {
+    if (er) return log.er(cb, "Couldn't read installed packages")(er)
+    log(inst, "installed")
+    var pkgs = Object.keys(inst)
+      , p = pkgs.length
+      , updates = {}
+      , tag = npm.config.get("tag")
+    function found () { if (--p === 0) cb(null, updates) }
+    pkgs.forEach(function (pkg) {
+      registry.get(pkg, function (er, data) {
+        if (er) return log(pkg, "not in registry", found)
+        var latest = data["dist-tags"] && data["dist-tags"][tag]
+          , have = Object.keys(inst[pkg]).sort(semver.sort)
+          , minHave = have[0]
+        if (!latest || !semver.gt(latest, minHave)) return found()
+        // we have something that's out of date.
+        updates[pkg] = {latest:latest,have:have}
+        found()
+      })
+    })
+  })
+}
+
-- 
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