gitstats/gitstats

#!/usr/bin/env python
# Copyright (c) 2007-2008 Heikki Hokkanen <hoxu@users.sf.net>
# GPLv2 / GPLv3
import subprocess
import datetime
import glob
import os
import pickle
import re
import shutil
import sys
import time
import zlib

GNUPLOT_COMMON = 'set terminal png transparent\nset size 0.5,0.5\n'
MAX_EXT_LENGTH = 10 # maximum file extension length

exectime_internal = 0.0
exectime_external = 0.0
time_start = time.time()

# By default, gnuplot is searched from path, but can be overridden with the
# environment variable "GNUPLOT"
gnuplot_cmd = 'gnuplot'
if 'GNUPLOT' in os.environ:
	gnuplot_cmd = os.environ['GNUPLOT']

def getpipeoutput(cmds, quiet = False):
	global exectime_external
	start = time.time()
	if not quiet:
		print '>> ' + ' | '.join(cmds),
		sys.stdout.flush()
	p0 = subprocess.Popen(cmds[0], stdout = subprocess.PIPE, shell = True)
	p = p0
	for x in cmds[1:]:
		p = subprocess.Popen(x, stdin = p0.stdout, stdout = subprocess.PIPE, shell = True)
		p0 = p
	output = p.communicate()[0]
	end = time.time()
	if not quiet:
		print '\r[%.5f] >> %s' % (end - start, ' | '.join(cmds))
	exectime_external += (end - start)
	return output.rstrip('\n')

def getkeyssortedbyvalues(dict):
	return map(lambda el : el[1], sorted(map(lambda el : (el[1], el[0]), dict.items())))

# dict['author'] = { 'commits': 512 } - ...key(dict, 'commits')
def getkeyssortedbyvaluekey(d, key):
	return map(lambda el : el[1], sorted(map(lambda el : (d[el][key], el), d.keys())))

class DataCollector:
	"""Manages data collection from a revision control repository."""
	def __init__(self):
		self.stamp_created = time.time()
		self.cache = {}
	
	##
	# This should be the main function to extract data from the repository.
	def collect(self, dir):
		self.dir = dir
		self.projectname = os.path.basename(os.path.abspath(dir))
	
	##
	# Load cacheable data
	def loadCache(self, cachefile):
		if not os.path.exists(cachefile):
			return
		print 'Loading cache...'
		f = open(cachefile)
		try:
			self.cache = pickle.loads(zlib.decompress(f.read()))
		except:
			# temporary hack to upgrade non-compressed caches
			f.seek(0)
			self.cache = pickle.load(f)
		f.close()
	
	##
	# Produce any additional statistics from the extracted data.
	def refine(self):
		pass

	##
	# : get a dictionary of author
	def getAuthorInfo(self, author):
		return None
	
	def getActivityByDayOfWeek(self):
		return {}

	def getActivityByHourOfDay(self):
		return {}

	##
	# Get a list of authors
	def getAuthors(self):
		return []
	
	def getFirstCommitDate(self):
		return datetime.datetime.now()
	
	def getLastCommitDate(self):
		return datetime.datetime.now()
	
	def getStampCreated(self):
		return self.stamp_created
	
	def getTags(self):
		return []
	
	def getTotalAuthors(self):
		return -1
	
	def getTotalCommits(self):
		return -1
		
	def getTotalFiles(self):
		return -1
	
	def getTotalLOC(self):
		return -1
	
	##
	# Save cacheable data
	def saveCache(self, filename):
		print 'Saving cache...'
		f = open(cachefile, 'w')
		#pickle.dump(self.cache, f)
		data = zlib.compress(pickle.dumps(self.cache))
		f.write(data)
		f.close()

class GitDataCollector(DataCollector):
	def collect(self, dir):
		DataCollector.collect(self, dir)

		try:
			self.total_authors = int(getpipeoutput(['git log', 'git shortlog -s', 'wc -l']))
		except:
			self.total_authors = 0
		#self.total_lines = int(getoutput('git-ls-files -z |xargs -0 cat |wc -l'))

		self.activity_by_hour_of_day = {} # hour -> commits
		self.activity_by_day_of_week = {} # day -> commits
		self.activity_by_month_of_year = {} # month [1-12] -> commits
		self.activity_by_hour_of_week = {} # weekday -> hour -> commits
		self.activity_by_hour_of_day_busiest = 0
		self.activity_by_hour_of_week_busiest = 0

		self.authors = {} # name -> {commits, first_commit_stamp, last_commit_stamp}

		# author of the month
		self.author_of_month = {} # month -> author -> commits
		self.author_of_year = {} # year -> author -> commits
		self.commits_by_month = {} # month -> commits
		self.commits_by_year = {} # year -> commits
		self.first_commit_stamp = 0
		self.last_commit_stamp = 0

		# tags
		self.tags = {}
		lines = getpipeoutput(['git show-ref --tags']).split('\n')
		for line in lines:
			if len(line) == 0:
				continue
			(hash, tag) = line.split(' ')

			tag = tag.replace('refs/tags/', '')
			output = getpipeoutput(['git log "%s" --pretty=format:"%%at %%an" -n 1' % hash])
			if len(output) > 0:
				parts = output.split(' ')
				stamp = 0
				try:
					stamp = int(parts[0])
				except ValueError:
					stamp = 0
				self.tags[tag] = { 'stamp': stamp, 'hash' : hash, 'date' : datetime.datetime.fromtimestamp(stamp).strftime('%Y-%m-%d') }

		# Collect revision statistics
		# Outputs "<stamp> <author>"
		lines = getpipeoutput(['git rev-list --pretty=format:"%at %an" HEAD', 'grep -v ^commit']).split('\n')
		for line in lines:
			# linux-2.6 says "<unknown>" for one line O_o
			parts = line.split(' ')
			author = ''
			try:
				stamp = int(parts[0])
			except ValueError:
				stamp = 0
			if len(parts) > 1:
				author = ' '.join(parts[1:])
			date = datetime.datetime.fromtimestamp(float(stamp))

			# First and last commit stamp
			if self.last_commit_stamp == 0:
				self.last_commit_stamp = stamp
			self.first_commit_stamp = stamp

			# activity
			# hour
			hour = date.hour
			if hour in self.activity_by_hour_of_day:
				self.activity_by_hour_of_day[hour] += 1
			else:
				self.activity_by_hour_of_day[hour] = 1
			# most active hour?
			if self.activity_by_hour_of_day[hour] > self.activity_by_hour_of_day_busiest:
				self.activity_by_hour_of_day_busiest = self.activity_by_hour_of_day[hour]

			# day of week
			day = date.weekday()
			if day in self.activity_by_day_of_week:
				self.activity_by_day_of_week[day] += 1
			else:
				self.activity_by_day_of_week[day] = 1

			# hour of week
			if day not in self.activity_by_hour_of_week:
				self.activity_by_hour_of_week[day] = {}
			if hour not in self.activity_by_hour_of_week[day]:
				self.activity_by_hour_of_week[day][hour] = 1
			else:
				self.activity_by_hour_of_week[day][hour] += 1
			# most active hour?
			if self.activity_by_hour_of_week[day][hour] > self.activity_by_hour_of_week_busiest:
				self.activity_by_hour_of_week_busiest = self.activity_by_hour_of_week[day][hour]

			# month of year
			month = date.month
			if month in self.activity_by_month_of_year:
				self.activity_by_month_of_year[month] += 1
			else:
				self.activity_by_month_of_year[month] = 1

			# author stats
			if author not in self.authors:
				self.authors[author] = {}
			# commits
			if 'last_commit_stamp' not in self.authors[author]:
				self.authors[author]['last_commit_stamp'] = stamp
			self.authors[author]['first_commit_stamp'] = stamp
			if 'commits' in self.authors[author]:
				self.authors[author]['commits'] += 1
			else:
				self.authors[author]['commits'] = 1

			# author of the month/year
			yymm = datetime.datetime.fromtimestamp(stamp).strftime('%Y-%m')
			if yymm in self.author_of_month:
				if author in self.author_of_month[yymm]:
					self.author_of_month[yymm][author] += 1
				else:
					self.author_of_month[yymm][author] = 1
			else:
				self.author_of_month[yymm] = {}
				self.author_of_month[yymm][author] = 1
			if yymm in self.commits_by_month:
				self.commits_by_month[yymm] += 1
			else:
				self.commits_by_month[yymm] = 1

			yy = datetime.datetime.fromtimestamp(stamp).year
			if yy in self.author_of_year:
				if author in self.author_of_year[yy]:
					self.author_of_year[yy][author] += 1
				else:
					self.author_of_year[yy][author] = 1
			else:
				self.author_of_year[yy] = {}
				self.author_of_year[yy][author] = 1
			if yy in self.commits_by_year:
				self.commits_by_year[yy] += 1
			else:
				self.commits_by_year[yy] = 1

		# TODO Optimize this, it's the worst bottleneck
		# outputs "<stamp> <files>" for each revision
		self.files_by_stamp = {} # stamp -> files
		revlines = getpipeoutput(['git rev-list --pretty=format:"%at %T" HEAD', 'grep -v ^commit']).strip().split('\n')
		lines = []
		for revline in revlines:
			time, rev = revline.split(' ')
			#linecount = int(getpipeoutput(['git-ls-tree -r --name-only "%s"' % rev, 'wc -l']).split('\n')[0])
			linecount = self.getFilesInCommit(rev)
			lines.append('%d %d' % (int(time), linecount))

		self.total_commits = len(lines)
		for line in lines:
			parts = line.split(' ')
			if len(parts) != 2:
				continue
			(stamp, files) = parts[0:2]
			try:
				self.files_by_stamp[int(stamp)] = int(files)
			except ValueError:
				print 'Warning: failed to parse line "%s"' % line

		# extensions
		self.extensions = {} # extension -> files, lines
		lines = getpipeoutput(['git ls-files']).split('\n')
		self.total_files = len(lines)
		for line in lines:
			base = os.path.basename(line)
			# Ignore extensionless (including .hidden files)
			if base.find('.') == -1 or base.rfind('.') == 0:
				ext = ''
			else:
				ext = base[(base.rfind('.') + 1):]
			if len(ext) > MAX_EXT_LENGTH:
				ext = ''

			if ext not in self.extensions:
				self.extensions[ext] = {'files': 0, 'lines': 0}

			self.extensions[ext]['files'] += 1
			try:
				# Escaping could probably be improved here
				self.extensions[ext]['lines'] += int(getpipeoutput(['wc -l "%s"' % line]).split()[0])
			except:
				print 'Warning: Could not count lines for file "%s"' % line

		# line statistics
		# outputs:
		#  N files changed, N insertions (+), N deletions(-)
		# <stamp> <author>
		self.changes_by_date = {} # stamp -> { files, ins, del }
		lines = getpipeoutput(['git log --shortstat --pretty=format:"%at %an"']).split('\n')
		lines.reverse()
		files = 0; inserted = 0; deleted = 0; total_lines = 0
		for line in lines:
			if len(line) == 0:
				continue

			# <stamp> <author>
			if line.find('files changed,') == -1:
				pos = line.find(' ')
				if pos != -1:
					try:
						(stamp, author) = (int(line[:pos]), line[pos+1:])
						self.changes_by_date[stamp] = { 'files': files, 'ins': inserted, 'del': deleted, 'lines': total_lines }
					except ValueError:
						print 'Warning: unexpected line "%s"' % line
				else:
					print 'Warning: unexpected line "%s"' % line
			else:
				numbers = re.findall('\d+', line)
				if len(numbers) == 3:
					(files, inserted, deleted) = map(lambda el : int(el), numbers)
					total_lines += inserted
					total_lines -= deleted
				else:
					print 'Warning: failed to handle line "%s"' % line
					(files, inserted, deleted) = (0, 0, 0)
				#self.changes_by_date[stamp] = { 'files': files, 'ins': inserted, 'del': deleted }
		self.total_lines = total_lines
	
	def refine(self):
		# authors
		# name -> {place_by_commits, commits_frac, date_first, date_last, timedelta}
		authors_by_commits = getkeyssortedbyvaluekey(self.authors, 'commits')
		authors_by_commits.reverse() # most first
		for i, name in enumerate(authors_by_commits):
			self.authors[name]['place_by_commits'] = i + 1

		for name in self.authors.keys():
			a = self.authors[name]
			a['commits_frac'] = (100 * float(a['commits'])) / self.getTotalCommits()
			date_first = datetime.datetime.fromtimestamp(a['first_commit_stamp'])
			date_last = datetime.datetime.fromtimestamp(a['last_commit_stamp'])
			delta = date_last - date_first
			a['date_first'] = date_first.strftime('%Y-%m-%d')
			a['date_last'] = date_last.strftime('%Y-%m-%d')
			a['timedelta'] = delta
	
	def getActivityByDayOfWeek(self):
		return self.activity_by_day_of_week

	def getActivityByHourOfDay(self):
		return self.activity_by_hour_of_day

	def getAuthorInfo(self, author):
		return self.authors[author]
	
	def getAuthors(self):
		return self.authors.keys()
	
	def getFilesInCommit(self, rev):
		try:
			res = self.cache['files_in_tree'][rev]
		except:
			res = int(getpipeoutput(['git ls-tree -r --name-only "%s"' % rev, 'wc -l']).split('\n')[0])
			if 'files_in_tree' not in self.cache:
				self.cache['files_in_tree'] = {}
			self.cache['files_in_tree'][rev] = res

		return res

	def getFirstCommitDate(self):
		return datetime.datetime.fromtimestamp(self.first_commit_stamp)
	
	def getLastCommitDate(self):
		return datetime.datetime.fromtimestamp(self.last_commit_stamp)
	
	def getTags(self):
		lines = getpipeoutput(['git show-ref --tags', 'cut -d/ -f3'])
		return lines.split('\n')
	
	def getTagDate(self, tag):
		return self.revToDate('tags/' + tag)
	
	def getTotalAuthors(self):
		return self.total_authors
	
	def getTotalCommits(self):
		return self.total_commits

	def getTotalFiles(self):
		return self.total_files
	
	def getTotalLOC(self):
		return self.total_lines
	
	def revToDate(self, rev):
		stamp = int(getpipeoutput(['git log --pretty=format:%%at "%s" -n 1' % rev]))
		return datetime.datetime.fromtimestamp(stamp).strftime('%Y-%m-%d')

class ReportCreator:
	"""Creates the actual report based on given data."""
	def __init__(self):
		pass
	
	def create(self, data, path):
		self.data = data
		self.path = path

def html_linkify(text):
	return text.lower().replace(' ', '_')

def html_header(level, text):
	name = html_linkify(text)
	return '\n<h%d><a href="#%s" name="%s">%s</a></h%d>\n\n' % (level, name, name, text, level)

class HTMLReportCreator(ReportCreator):
	def create(self, data, path):
		ReportCreator.create(self, data, path)
		self.title = data.projectname

		# copy static files if they do not exist
		for file in ('gitstats.css', 'sortable.js', 'arrow-up.gif', 'arrow-down.gif', 'arrow-none.gif'):
			basedir = os.path.dirname(os.path.abspath(__file__))
			shutil.copyfile(basedir + '/' + file, path + '/' + file)

		f = open(path + "/index.html", 'w')
		format = '%Y-%m-%d %H:%m:%S'
		self.printHeader(f)

		f.write('<h1>GitStats - %s</h1>' % data.projectname)

		self.printNav(f)

		f.write('<dl>');
		f.write('<dt>Project name</dt><dd>%s</dd>' % (data.projectname))
		f.write('<dt>Generated</dt><dd>%s (in %d seconds)</dd>' % (datetime.datetime.now().strftime(format), time.time() - data.getStampCreated()));
		f.write('<dt>Report Period</dt><dd>%s to %s</dd>' % (data.getFirstCommitDate().strftime(format), data.getLastCommitDate().strftime(format)))
		f.write('<dt>Total Files</dt><dd>%s</dd>' % data.getTotalFiles())
		f.write('<dt>Total Lines of Code</dt><dd>%s</dd>' % data.getTotalLOC())
		f.write('<dt>Total Commits</dt><dd>%s</dd>' % data.getTotalCommits())
		f.write('<dt>Authors</dt><dd>%s</dd>' % data.getTotalAuthors())
		f.write('</dl>');

		f.write('</body>\n</html>');
		f.close()

		###
		# Activity
		f = open(path + '/activity.html', 'w')
		self.printHeader(f)
		f.write('<h1>Activity</h1>')
		self.printNav(f)

		#f.write('<h2>Last 30 days</h2>')

		#f.write('<h2>Last 12 months</h2>')

		# Hour of Day
		f.write(html_header(2, 'Hour of Day'))
		hour_of_day = data.getActivityByHourOfDay()
		f.write('<table><tr><th>Hour</th>')
		for i in range(1, 25):
			f.write('<th>%d</th>' % i)
		f.write('</tr>\n<tr><th>Commits</th>')
		fp = open(path + '/hour_of_day.dat', 'w')
		for i in range(0, 24):
			if i in hour_of_day:
				r = 127 + int((float(hour_of_day[i]) / data.activity_by_hour_of_day_busiest) * 128)
				f.write('<td style="background-color: rgb(%d, 0, 0)">%d</td>' % (r, hour_of_day[i]))
				fp.write('%d %d\n' % (i, hour_of_day[i]))
			else:
				f.write('<td>0</td>')
				fp.write('%d 0\n' % i)
		fp.close()
		f.write('</tr>\n<tr><th>%</th>')
		totalcommits = data.getTotalCommits()
		for i in range(0, 24):
			if i in hour_of_day:
				r = 127 + int((float(hour_of_day[i]) / data.activity_by_hour_of_day_busiest) * 128)
				f.write('<td style="background-color: rgb(%d, 0, 0)">%.2f</td>' % (r, (100.0 * hour_of_day[i]) / totalcommits))
			else:
				f.write('<td>0.00</td>')
		f.write('</tr></table>')
		f.write('<img src="hour_of_day.png" alt="Hour of Day" />')
		fg = open(path + '/hour_of_day.dat', 'w')
		for i in range(0, 24):
			if i in hour_of_day:
				fg.write('%d %d\n' % (i + 1, hour_of_day[i]))
			else:
				fg.write('%d 0\n' % (i + 1))
		fg.close()

		# Day of Week
		f.write(html_header(2, 'Day of Week'))
		day_of_week = data.getActivityByDayOfWeek()
		f.write('<div class="vtable"><table>')
		f.write('<tr><th>Day</th><th>Total (%)</th></tr>')
		fp = open(path + '/day_of_week.dat', 'w')
		for d in range(0, 7):
			commits = 0
			if d in day_of_week:
				commits = day_of_week[d]
			fp.write('%d %d\n' % (d + 1, commits))
			f.write('<tr>')
			f.write('<th>%d</th>' % (d + 1))
			if d in day_of_week:
				f.write('<td>%d (%.2f%%)</td>' % (day_of_week[d], (100.0 * day_of_week[d]) / totalcommits))
			else:
				f.write('<td>0</td>')
			f.write('</tr>')
		f.write('</table></div>')
		f.write('<img src="day_of_week.png" alt="Day of Week" />')
		fp.close()

		# Hour of Week
		f.write(html_header(2, 'Hour of Week'))
		f.write('<table>')

		f.write('<tr><th>Weekday</th>')
		for hour in range(0, 24):
			f.write('<th>%d</th>' % (hour + 1))
		f.write('</tr>')

		for weekday in range(0, 7):
			f.write('<tr><th>%d</th>' % (weekday + 1))
			for hour in range(0, 24):
				try:
					commits = data.activity_by_hour_of_week[weekday][hour]
				except KeyError:
					commits = 0
				if commits != 0:
					f.write('<td');
					r = 127 + int((float(commits) / data.activity_by_hour_of_week_busiest) * 128)
					f.write(' style="background-color: rgb(%d, 0, 0)"' % r);
					f.write('>%d</td>' % commits);
				else:
					f.write('<td></td>')
			f.write('</tr>')

		f.write('</table>')

		# Month of Year
		f.write(html_header(2, 'Month of Year'))
		f.write('<div class="vtable"><table>')
		f.write('<tr><th>Month</th><th>Commits (%)</th></tr>')
		fp = open (path + '/month_of_year.dat', 'w')
		for mm in range(1, 13):
			commits = 0
			if mm in data.activity_by_month_of_year:
				commits = data.activity_by_month_of_year[mm]
			f.write('<tr><td>%d</td><td>%d (%.2f %%)</td></tr>' % (mm, commits, (100.0 * commits) / data.getTotalCommits()))
			fp.write('%d %d\n' % (mm, commits))
		fp.close()
		f.write('</table></div>')
		f.write('<img src="month_of_year.png" alt="Month of Year" />')

		# Commits by year/month
		f.write(html_header(2, 'Commits by year/month'))
		f.write('<div class="vtable"><table><tr><th>Month</th><th>Commits</th></tr>')
		for yymm in reversed(sorted(data.commits_by_month.keys())):
			f.write('<tr><td>%s</td><td>%d</td></tr>' % (yymm, data.commits_by_month[yymm]))
		f.write('</table></div>')
		f.write('<img src="commits_by_year_month.png" alt="Commits by year/month" />')
		fg = open(path + '/commits_by_year_month.dat', 'w')
		for yymm in sorted(data.commits_by_month.keys()):
			fg.write('%s %s\n' % (yymm, data.commits_by_month[yymm]))
		fg.close()

		# Commits by year
		f.write(html_header(2, 'Commits by Year'))
		f.write('<div class="vtable"><table><tr><th>Year</th><th>Commits (% of all)</th></tr>')
		for yy in reversed(sorted(data.commits_by_year.keys())):
			f.write('<tr><td>%s</td><td>%d (%.2f%%)</td></tr>' % (yy, data.commits_by_year[yy], (100.0 * data.commits_by_year[yy]) / data.getTotalCommits()))
		f.write('</table></div>')
		f.write('<img src="commits_by_year.png" alt="Commits by Year" />')
		fg = open(path + '/commits_by_year.dat', 'w')
		for yy in sorted(data.commits_by_year.keys()):
			fg.write('%d %d\n' % (yy, data.commits_by_year[yy]))
		fg.close()

		f.write('</body></html>')
		f.close()

		###
		# Authors
		f = open(path + '/authors.html', 'w')
		self.printHeader(f)

		f.write('<h1>Authors</h1>')
		self.printNav(f)

		# Authors :: List of authors
		f.write(html_header(2, 'List of Authors'))

		f.write('<table class="authors sortable" id="authors">')
		f.write('<tr><th>Author</th><th>Commits (%)</th><th>First commit</th><th>Last commit</th><th class="unsortable">Age</th><th># by commits</th></tr>')
		for author in sorted(data.getAuthors()):
			info = data.getAuthorInfo(author)
			f.write('<tr><td>%s</td><td>%d (%.2f%%)</td><td>%s</td><td>%s</td><td>%s</td><td>%d</td></tr>' % (author, info['commits'], info['commits_frac'], info['date_first'], info['date_last'], info['timedelta'], info['place_by_commits']))
		f.write('</table>')

		# Authors :: Author of Month
		f.write(html_header(2, 'Author of Month'))
		f.write('<table class="sortable" id="aom">')
		f.write('<tr><th>Month</th><th>Author</th><th>Commits (%)</th><th class="unsortable">Next top 5</th></tr>')
		for yymm in reversed(sorted(data.author_of_month.keys())):
			authordict = data.author_of_month[yymm]
			authors = getkeyssortedbyvalues(authordict)
			authors.reverse()
			commits = data.author_of_month[yymm][authors[0]]
			next = ', '.join(authors[1:5])
			f.write('<tr><td>%s</td><td>%s</td><td>%d (%.2f%% of %d)</td><td>%s</td></tr>' % (yymm, authors[0], commits, (100 * commits) / data.commits_by_month[yymm], data.commits_by_month[yymm], next))

		f.write('</table>')

		f.write(html_header(2, 'Author of Year'))
		f.write('<table class="sortable" id="aoy"><tr><th>Year</th><th>Author</th><th>Commits (%)</th><th class="unsortable">Next top 5</th></tr>')
		for yy in reversed(sorted(data.author_of_year.keys())):
			authordict = data.author_of_year[yy]
			authors = getkeyssortedbyvalues(authordict)
			authors.reverse()
			commits = data.author_of_year[yy][authors[0]]
			next = ', '.join(authors[1:5])
			f.write('<tr><td>%s</td><td>%s</td><td>%d (%.2f%% of %d)</td><td>%s</td></tr>' % (yy, authors[0], commits, (100 * commits) / data.commits_by_year[yy], data.commits_by_year[yy], next))
		f.write('</table>')

		f.write('</body></html>')
		f.close()

		###
		# Files
		f = open(path + '/files.html', 'w')
		self.printHeader(f)
		f.write('<h1>Files</h1>')
		self.printNav(f)

		f.write('<dl>\n')
		f.write('<dt>Total files</dt><dd>%d</dd>' % data.getTotalFiles())
		f.write('<dt>Total lines</dt><dd>%d</dd>' % data.getTotalLOC())
		f.write('<dt>Average file size</dt><dd>%.2f bytes</dd>' % ((100.0 * data.getTotalLOC()) / data.getTotalFiles()))
		f.write('</dl>\n')

		# Files :: File count by date
		f.write(html_header(2, 'File count by date'))

		fg = open(path + '/files_by_date.dat', 'w')
		for stamp in sorted(data.files_by_stamp.keys()):
			fg.write('%s %d\n' % (datetime.datetime.fromtimestamp(stamp).strftime('%Y-%m-%d'), data.files_by_stamp[stamp]))
		fg.close()
			
		f.write('<img src="files_by_date.png" alt="Files by Date" />')

		#f.write('<h2>Average file size by date</h2>')

		# Files :: Extensions
		f.write(html_header(2, 'Extensions'))
		f.write('<table class="sortable" id="ext"><tr><th>Extension</th><th>Files (%)</th><th>Lines (%)</th><th>Lines/file</th></tr>')
		for ext in sorted(data.extensions.keys()):
			files = data.extensions[ext]['files']
			lines = data.extensions[ext]['lines']
			f.write('<tr><td>%s</td><td>%d (%.2f%%)</td><td>%d (%.2f%%)</td><td>%d</td></tr>' % (ext, files, (100.0 * files) / data.getTotalFiles(), lines, (100.0 * lines) / data.getTotalLOC(), lines / files))
		f.write('</table>')

		f.write('</body></html>')
		f.close()

		###
		# Lines
		f = open(path + '/lines.html', 'w')
		self.printHeader(f)
		f.write('<h1>Lines</h1>')
		self.printNav(f)

		f.write('<dl>\n')
		f.write('<dt>Total lines</dt><dd>%d</dd>' % data.getTotalLOC())
		f.write('</dl>\n')

		f.write(html_header(2, 'Lines of Code'))
		f.write('<img src="lines_of_code.png" />')

		fg = open(path + '/lines_of_code.dat', 'w')
		for stamp in sorted(data.changes_by_date.keys()):
			fg.write('%d %d\n' % (stamp, data.changes_by_date[stamp]['lines']))
		fg.close()

		f.write('</body></html>')
		f.close()

		###
		# tags.html
		f = open(path + '/tags.html', 'w')
		self.printHeader(f)
		f.write('<h1>Tags</h1>')
		self.printNav(f)

		f.write('<dl>')
		f.write('<dt>Total tags</dt><dd>%d</dd>' % len(data.tags))
		if len(data.tags) > 0:
			f.write('<dt>Average commits per tag</dt><dd>%.2f</dd>' % (data.getTotalCommits() / len(data.tags)))
		f.write('</dl>')

		f.write('<table>')
		f.write('<tr><th>Name</th><th>Date</th></tr>')
		# sort the tags by date desc
		tags_sorted_by_date_desc = map(lambda el : el[1], reversed(sorted(map(lambda el : (el[1]['date'], el[0]), data.tags.items()))))
		for tag in tags_sorted_by_date_desc:
			f.write('<tr><td>%s</td><td>%s</td></tr>' % (tag, data.tags[tag]['date']))
		f.write('</table>')

		f.write('</body></html>')
		f.close()

		self.createGraphs(path)
	
	def createGraphs(self, path):
		print 'Generating graphs...'

		# hour of day
		f = open(path + '/hour_of_day.plot', 'w')
		f.write(GNUPLOT_COMMON)
		f.write(
"""
set output 'hour_of_day.png'
unset key
set xrange [0.5:24.5]
set xtics 4
set ylabel "Commits"
plot 'hour_of_day.dat' using 1:2:(0.5) w boxes fs solid
""")
		f.close()

		# day of week
		f = open(path + '/day_of_week.plot', 'w')
		f.write(GNUPLOT_COMMON)
		f.write(
"""
set output 'day_of_week.png'
unset key
set xrange [0.5:7.5]
set xtics 1
set ylabel "Commits"
plot 'day_of_week.dat' using 1:2:(0.5) w boxes fs solid
""")
		f.close()

		# Month of Year
		f = open(path + '/month_of_year.plot', 'w')
		f.write(GNUPLOT_COMMON)
		f.write(
"""
set output 'month_of_year.png'
unset key
set xrange [0.5:12.5]
set xtics 1
set ylabel "Commits"
plot 'month_of_year.dat' using 1:2:(0.5) w boxes fs solid
""")
		f.close()

		# commits_by_year_month
		f = open(path + '/commits_by_year_month.plot', 'w')
		f.write(GNUPLOT_COMMON)
		f.write(
"""
set output 'commits_by_year_month.png'
unset key
set xdata time
set timefmt "%Y-%m"
set format x "%Y-%m"
set xtics rotate by 90 15768000
set bmargin 5
set ylabel "Commits"
plot 'commits_by_year_month.dat' using 1:2:(0.5) w boxes fs solid
""")
		f.close()

		# commits_by_year
		f = open(path + '/commits_by_year.plot', 'w')
		f.write(GNUPLOT_COMMON)
		f.write(
"""
set output 'commits_by_year.png'
unset key
set xtics 1
set ylabel "Commits"
set yrange [0:]
plot 'commits_by_year.dat' using 1:2:(0.5) w boxes fs solid
""")
		f.close()

		# Files by date
		f = open(path + '/files_by_date.plot', 'w')
		f.write(GNUPLOT_COMMON)
		f.write(
"""
set output 'files_by_date.png'
unset key
set xdata time
set timefmt "%Y-%m-%d"
set format x "%Y-%m-%d"
set ylabel "Files"
set xtics rotate by 90
set bmargin 6
plot 'files_by_date.dat' using 1:2 w histeps
""")
		f.close()

		# Lines of Code
		f = open(path + '/lines_of_code.plot', 'w')
		f.write(GNUPLOT_COMMON)
		f.write(
"""
set output 'lines_of_code.png'
unset key
set xdata time
set timefmt "%s"
set format x "%Y-%m-%d"
set ylabel "Lines"
set xtics rotate by 90
set bmargin 6
plot 'lines_of_code.dat' using 1:2 w lines
""")
		f.close()

		os.chdir(path)
		files = glob.glob(path + '/*.plot')
		for f in files:
			out = getpipeoutput([gnuplot_cmd + ' "%s"' % f])
			if len(out) > 0:
				print out

	def printHeader(self, f, title = ''):
		f.write(
"""<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
	<title>GitStats - %s</title>
	<link rel="stylesheet" href="gitstats.css" type="text/css" />
	<meta name="generator" content="GitStats" />
	<script type="text/javascript" src="sortable.js"></script>
</head>
<body>
""" % self.title)

	def printNav(self, f):
		f.write("""
<div class="nav">
<ul>
<li><a href="index.html">General</a></li>
<li><a href="activity.html">Activity</a></li>
<li><a href="authors.html">Authors</a></li>
<li><a href="files.html">Files</a></li>
<li><a href="lines.html">Lines</a></li>
<li><a href="tags.html">Tags</a></li>
</ul>
</div>
""")
		

usage = """
Usage: gitstats [options] <gitpath> <outputpath>

Options:
"""

if len(sys.argv) <  3:
	print usage
	sys.exit(0)

gitpath = sys.argv[1]
outputpath = os.path.abspath(sys.argv[2])
rundir = os.getcwd()

try:
	os.makedirs(outputpath)
except OSError:
	pass
if not os.path.isdir(outputpath):
	print 'FATAL: Output path is not a directory or does not exist'
	sys.exit(1)

print 'Git path: %s' % gitpath
print 'Output path: %s' % outputpath

os.chdir(gitpath)

cachefile = os.path.join(outputpath, 'gitstats.cache')

print 'Collecting data...'
data = GitDataCollector()
data.loadCache(cachefile)
data.collect(gitpath)
print 'Refining data...'
data.saveCache(cachefile)
data.refine()

os.chdir(rundir)

print 'Generating report...'
report = HTMLReportCreator()
report.create(data, outputpath)

time_end = time.time()
exectime_internal = time_end - time_start
print 'Execution time %.5f secs, %.5f secs (%.2f %%) in external commands)' % (exectime_internal, exectime_external, (100.0 * exectime_external) / exectime_internal)