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#!/usr/bin/env node

// TODO(vojta): pre-commit hook for validating messages

// TODO(vojta): report errors, currently Q silence everything which really sucks

'use strict';

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 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|Fixes)\s#(\d+)/);

if (match) msg.closes.push(parseInt(match[1]));

});

match = raw.match(/BREAKING CHANGE:([\s\S]*)/);

if (match) {

msg.breaking = 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;

}

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, printCommitLinks) {

printCommitLinks = printCommitLinks === undefined ? true : printCommitLinks;

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 = '-';

var nested = section[name].length > 1;

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) {

if (printCommitLinks) {

stream.write(util.format('%s %s\n (%s', prefix, commit.subject, linkToCommit(commit.hash)));

if (commit.closes.length) {

stream.write(',\n ' + commit.closes.map(linkToIssue).join(', '));

}

stream.write(')\n');

} else {

stream.write(util.format('%s %s', prefix, commit.subject));

}

});

stream.write('\n');

};

var readGitLog = function(grep, from) {

var deferred = 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);

});

deferred.resolve(commits);

});

return deferred.promise;

};

var writeChangelog = function(stream, commits, version) {

var sections = {

fix: {},

feat: {},

perf: {},

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);

}

if (commit.breaking) {

sections.breaks[component] = sections.breaks[component] || [];

sections.breaks[component].push({

subject: util.format("due to %s,\n %s", linkToCommit(commit.hash), commit.breaking),

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, 'Performance Improvements', sections.perf);

printSection(stream, 'Breaking Changes', sections.breaks, false);

};

var getPreviousTag = function() {

var deferred = q.defer();

child.exec(GIT_TAG_CMD, function(code, stdout, stderr) {

if (code) deferred.reject('Cannot get the previous tag.');

else deferred.resolve(stdout.replace('\n', ''));

});

return deferred.promise;

};

var generate = function(version, file) {

getPreviousTag().then(function(tag) {

console.log('Reading git log since', tag);

readGitLog('^fix|^feat|^perf|BREAKING', 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]);

}

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