From cf0e6f360962abe62f1f49b0226b234e54adcff1 Mon Sep 17 00:00:00 2001
From: Brian Ford
Date: Fri, 9 Aug 2013 17:26:07 -0700
Subject: chore(release): add script for comparing master and stable branches

---
 compare-master-to-stable.js | 163 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100755 compare-master-to-stable.js

(limited to 'compare-master-to-stable.js')

diff --git a/compare-master-to-stable.js b/compare-master-to-stable.js
new file mode 100755
index 00000000..404383b0
--- /dev/null
+++ b/compare-master-to-stable.js
@@ -0,0 +1,163 @@
+#!/usr/local/bin/node
+
+var util = require('util');
+var cp = require('child_process');
+
+var Q = require('q');
+var _ = require('lodash');
+var semver = require('semver');
+
+var exec = function (cmd) {
+  return function () {
+    var args = Array.prototype.slice.call(arguments, 0);
+    args.unshift(cmd);
+    var fullCmd = util.format.apply(util, args);
+    return Q.nfcall(cp.exec, fullCmd).then(function (out) {
+      return out[0].split('\n');
+    });
+  };
+};
+
+var andThen = function (fn, after) {
+  return function () {
+    return fn.apply(this, arguments).then(after);
+  };
+};
+
+var oneArg = function (fn) {
+  return function (arg) {
+    return fn(arg);
+  };
+};
+
+var oneLine = function (lines) {
+  return lines[0].trim();
+};
+
+var noArgs = function (fn) {
+  return function () {
+    return fn();
+  };
+};
+
+var identity = function (i) { return i; };
+
+// like Q.all, but runs the comands in series
+// useful for ensuring env state (like which branch is checked out)
+var allInSeries = function (fn) {
+  return function (args) {
+    var results = [];
+    var def;
+    while (args.length > 0) {
+      (function (arg) {
+        if (def) {
+          def = def.then(function () {
+            return fn(arg);
+          });
+        } else {
+          def = fn(arg);
+        }
+        def = def.then(function (res) {
+          results.push(res);
+        });
+      }(args.pop()));
+    }
+    return def.then(function () {
+      return results;
+    });
+  };
+};
+
+var compareBranches = function (left, right) {
+  console.log('# These commits are in ' + left.name + ' but not in ' + right.name + '\n');
+  console.log(_(left.log).
+    difference(right.log).
+    map(function (line) {
+      return left.full[left.log.indexOf(line)]; // lol O(n^2)
+    }).
+    value().
+    join('\n'));
+};
+
+var checkout = oneArg(exec('git checkout %s'));
+
+var getCurrentBranch = andThen(noArgs(exec('git rev-parse --abbrev-ref HEAD')), oneLine);
+var getTags = noArgs(exec('git tag'));
+var getShaOfTag = oneArg(exec('git rev-list %s | head -n 1'));
+var getTheLog = oneArg(exec('git log --pretty=oneline %s..HEAD | cat'));
+
+// remember this so we can restore state
+var currentBranch;
+
+getCurrentBranch().
+then(function (branch) {
+  currentBranch = branch;
+}).
+then(getTags).
+then(function (tags) {
+  return tags.
+    filter(semver.valid).
+    map(semver.clean).
+    sort(semver.rcompare);
+}).
+then(function (tags) {
+  var major = tags[0].split('.')[0] + '.x';
+  return tags.
+    filter(function (ver) {
+      return semver.satisfies(ver, major);
+    });
+}).
+then(function (tags) {
+  return _(tags).
+    groupBy(function (tag) {
+      return tag.split('.')[1];
+    }).
+    map(function (group) {
+      return _.first(group);
+    }).
+    map(function (tag) {
+      return 'v' + tag;
+    }).
+    value();
+}).
+then(function (tags) {
+  return [
+    { name: 'v1.0.x', tag: tags[0] },
+    { name: 'master', tag: tags[1] }
+  ];
+}).
+then(allInSeries(function (branch) {
+  return checkout(branch.name).
+    then(function () {
+      return getTheLog(branch.tag);
+    }).
+    then(function (log) {
+      return log.
+        filter(identity);
+    }).
+    then(function (log) {
+      branch.full = log.map(function (line) {
+        line = line.split(' ');
+        var sha = line.shift();
+        var msg = line.join(' ');
+        return sha + (msg.toLowerCase().indexOf('fix') === -1 ? '   ' : ' * ') + msg;
+      });
+      branch.log = log.map(function (line) {
+        return line.substr(41)
+      });
+      return branch;
+    });
+})).
+then(function (pairs) {
+  compareBranches(pairs[0], pairs[1]);
+  console.log('\n');
+  compareBranches(pairs[1], pairs[0]);
+  return pairs;
+}).
+then(function () {
+  return checkout(currentBranch);
+}).
+catch(function (e) {
+  console.log(e.stack);
+});
+
-- 
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