1 files changed, 201 insertions, 0 deletions
diff --git a/changelog.js b/changelog.js
new file mode 100755
index 00000000..0083d29b
--- /dev/null
+++ b/changelog.js
@@ -0,0 +1,201 @@
+#!/usr/bin/env node
+
+// TODO(vojta): pre-commit hook for validating messages
+// TODO(vojta): report errors, currently Q silence everything which really sucks
+
+var child = require('child_process');
+var fs = require('fs');
+var util = require('util');
+var q = require('qq');
+
+var GIT_LOG_CMD = 'git log --grep="%s" -E --format=%s %s..HEAD';
+var GIT_TAG_CMD = 'git describe --tags --abbrev=0';
+
+var HEADER_TPL = '<a name="%s"></a>\n# %s (%s)\n\n';
+var LINK_ISSUE = '[#%s](https://github.com/angular/angular.js/issues/%s)';
+var LINK_COMMIT = '[%s](https://github.com/angular/angular.js/commit/%s)';
+
+var EMPTY_COMPONENT = '$$';
+var MAX_SUBJECT_LENGTH = 80;
+
+
+var warn = function() {
+  console.log('WARNING:', util.format.apply(null, arguments));
+};
+
+
+var parseRawCommit = function(raw) {
+  if (!raw) return null;
+
+  var lines = raw.split('\n');
+  var msg = {}, match;
+
+  msg.hash = lines.shift();
+  msg.subject = lines.shift();
+  msg.closes = [];
+  msg.breaks = [];
+
+  lines.forEach(function(line) {
+    match = line.match(/Closes\s#(\d+)/);
+    if (match) msg.closes.push(parseInt(match[1]));
+
+    match = line.match(/Breaks\s(.*)/);
+    if (match) msg.breaks.push(match[1]);
+  });
+
+  msg.body = lines.join('\n');
+  match = msg.subject.match(/^(.*)\((.*)\)\:\s(.*)$/);
+
+  if (!match || !match[1] || !match[3]) {
+    warn('Incorrect message: %s %s', msg.hash, msg.subject);
+    return null;
+  }
+
+  if (match[3].length > MAX_SUBJECT_LENGTH) {
+    warn('Too long subject: %s %s', msg.hash, msg.subject);
+    match[3] = match[3].substr(0, MAX_SUBJECT_LENGTH);
+  }
+
+  msg.type = match[1];
+  msg.component = match[2];
+  msg.subject = match[3];
+
+  return msg;
+};
+
+
+var linkToIssue = function(issue) {
+  return util.format(LINK_ISSUE, issue, issue);
+};
+
+
+var linkToCommit = function(hash) {
+  return util.format(LINK_COMMIT, hash.substr(0, 8), hash);
+};
+
+
+var currentDate = function() {
+  var now = new Date();
+  var pad = function(i) {
+    return ('0' + i).substr(-2);
+  };
+
+  return util.format('%d-%s-%s', now.getFullYear(), pad(now.getMonth() + 1), pad(now.getDate()));
+};
+
+
+var printSection = function(stream, title, section) {
+  var NESTED = true;
+  var components = Object.getOwnPropertyNames(section).sort();
+
+  if (!components.length) return;
+
+  stream.write(util.format('\n## %s\n\n', title));
+
+  components.forEach(function(name) {
+    var prefix = '-';
+
+    if (name !== EMPTY_COMPONENT) {
+      if (NESTED) {
+        stream.write(util.format('- **%s:**\n', name));
+        prefix = '  -';
+      } else {
+        prefix = util.format('- **%s:**', name);
+      }
+    }
+
+    section[name].forEach(function(commit) {
+      stream.write(util.format('%s %s (%s', prefix, commit.subject, linkToCommit(commit.hash)));
+      if (commit.closes.length) {
+        stream.write(', closes ' + commit.closes.map(linkToIssue).join(', '));
+      }
+      stream.write(')\n');
+    });
+  });
+
+  stream.write('\n');
+};
+
+
+var readGitLog = function(grep, from) {
+  var deffered = q.defer();
+
+  // TODO(vojta): if it's slow, use spawn and stream it instead
+  child.exec(util.format(GIT_LOG_CMD, grep, '%H%n%s%n%b%n==END==', from), function(code, stdout, stderr) {
+    var commits = [];
+
+    stdout.split('\n==END==\n').forEach(function(rawCommit) {
+      var commit = parseRawCommit(rawCommit);
+      if (commit) commits.push(commit);
+    });
+
+    deffered.resolve(commits);
+  });
+
+  return deffered.promise;
+};
+
+
+var writeChangelog = function(stream, commits, version) {
+  var sections = {
+    fix: {},
+    feat: {},
+    breaks: {}
+  };
+
+  sections.breaks[EMPTY_COMPONENT] = [];
+
+  commits.forEach(function(commit) {
+    var section = sections[commit.type];
+    var component = commit.component || EMPTY_COMPONENT;
+
+    if (section) {
+      section[component] = section[component] || [];
+      section[component].push(commit);
+    }
+
+    commit.breaks.forEach(function(breakMsg) {
+      sections.breaks[EMPTY_COMPONENT].push({
+        subject: breakMsg,
+        hash: commit.hash,
+        closes: []
+      });
+    });
+  });
+
+  stream.write(util.format(HEADER_TPL, version, version, currentDate()));
+  printSection(stream, 'Bug Fixes', sections.fix);
+  printSection(stream, 'Features', sections.feat);
+  printSection(stream, 'Breaking Changes', sections.breaks);
+}
+
+
+var getPreviousTag = function() {
+  var deffered = q.defer();
+  child.exec(GIT_TAG_CMD, function(code, stdout, stderr) {
+    if (code) deffered.reject('Cannot get the previous tag.');
+    else deffered.resolve(stdout.replace('\n', ''));
+  });
+  return deffered.promise;
+};
+
+
+var generate = function(version, file) {
+  getPreviousTag().then(function(tag) {
+    console.log('Reading git log since', tag);
+    readGitLog('^fix|^feat|Breaks', tag).then(function(commits) {
+      console.log('Parsed', commits.length, 'commits');
+      console.log('Generating changelog to', file || 'stdout', '(', version, ')');
+      writeChangelog(file ? fs.createWriteStream(file) : process.stdout, commits, version);
+    });
+  });
+};
+
+
+// publish for testing
+exports.parseRawCommit = parseRawCommit;
+
+// hacky start if not run by jasmine :-D
+if (process.argv.join('').indexOf('jasmine-node') === -1) {
+  generate(process.argv[2], process.argv[3]);
+}