update pit with python3 support

pit

@@ -5,16 +5,26 @@ pit : python issue tracker.
 
 pit is a simple issue tracker written in python
 """
-__version__ = '0.3'
+from __future__ import print_function
+
+__version__ = '0.4'
 
 import sys, os
 import shutil
-import ConfigParser
+
 from hashlib import sha1
-import StringIO
 import subprocess
 import datetime
 
+if sys.version_info[0] == 2:
+    import ConfigParser as configparser
+    import StringIO as io
+    input = raw_input
+else:
+    import configparser
+    import io
+
+
 # Searching for the pit dir
 
 pitdir = None
@@ -32,7 +42,7 @@ def find_pitdir():
             curdir = os.path.split(curdir)[0]
 
     if pitdir is None:
-        print 'No pit repo found in this directory or in any parent directory.'
+        print('No pit repo found in this directory or in any parent directory.')
         exit(0)
 
 # Reading Writing issues
@@ -53,13 +63,14 @@ def get_author():
         author = author.strip('\n')
         mail   = mail.strip('\n')
         return author, mail
-    except OSError, subprocess.CalledProcessError:
+    except OSError as xxx_todo_changeme:
+        subprocess.CalledProcessError = xxx_todo_changeme
         return 'anonymous', 'unknow'
 
 def get_issue_date(issue):
     try:
         return datetime.datetime.strptime(issue.get('header', 'date'), '%Y-%m-%d at %H:%M UCT')
-    except ConfigParser.NoOptionError:
+    except configparser.NoOptionError:
         return datetime.datetime(2012, 8, 7, 0, 36, 32, 0)
 
 def issue_file(digest):
@@ -80,7 +91,7 @@ def find_issue_file(digest):
 def read_issue(digest):
     f = find_issue_file(digest)
     if os.path.exists(f):
-        issue = ConfigParser.ConfigParser()
+        issue = configparser.ConfigParser()
         issue.read(f)
         return issue
     else:
@@ -154,14 +165,14 @@ def show_issues(filtered_status):
     relevant_issues.sort()
     for _, line in relevant_issues:
         #print _
-        print line
+        print(line)
 
 # Commands
 
 def init_cmd():
     """Create a .pit directory"""
     pitdir = os.getcwd() + '/.pit'
-    print "initializing pit in %s" % (pitdir,)
+    print("initializing pit in %s" % (pitdir,))
     if not os.path.exists(pitdir):
         os.makedirs(pitdir)
 
@@ -170,9 +181,9 @@ def add_cmd(title):
     # finding type
     t = None
     while t not in set(['b', 'f', 't', '', 'bug', 'feature', 'task']):
-        print "bug (b), feature (f) or task (t) ? [b]: ",
+        print("bug (b), feature (f) or task (t) ? [b]: ", end=' ')
         sys.stdout.flush()
-        t = raw_input()
+        t = input()
     if t == '':
         t = 'b'
     extend = {'b':'bug', 'f':'feature', 't':'task'}
@@ -181,14 +192,14 @@ def add_cmd(title):
 
     # finding the digest
     issue = setup_issue('', title, t)
-    s = StringIO.StringIO()
+    s = io.StringIO()
     issue.write(s)
     digest = sha1digest(s.getvalue())
 
     # creating the issue values
     filepath = issue_file(digest)
     if os.path.exists(filepath):
-        print '{}error{}: an issue by this name already exists; exiting.'.format(red, end)
+        print('{}error{}: an issue by this name already exists; exiting.'.format(red, end))
         exit(1)
     issue.set('header', 'id', digest)
     issue.set('eventlog', 'opened[0]', 'opened the {} by {}'.format(issue.get('header', 'date'),
@@ -199,9 +210,9 @@ def add_cmd(title):
        with open(filepath, 'w') as f:
            issue.write(f)
     except IOError as e:
-       print 'IOError : impossible to write on issue file {:s}'.format(issue_file(digest))
-       print 'Verify file permissions'
-    print oneline(issue)
+       print('IOError : impossible to write on issue file {:s}'.format(issue_file(digest)))
+       print('Verify file permissions')
+    print(oneline(issue))
 
 def close_cmd(digest):
     """Close issue n"""
@@ -209,7 +220,7 @@ def close_cmd(digest):
     status = issue.get('header', 'status')
     digest = issue.get('header', 'id')[:sha1_length]
     if status == 'closed':
-        print "{}warning{}: issue {}{}{} already closed".format(red, end, bold, digest, end)
+        print("{}warning{}: issue {}{}{} already closed".format(red, end, bold, digest, end))
     else:
         issue.set('header','status','closed')
         now = datetime.datetime.utcnow()
@@ -226,8 +237,8 @@ def close_cmd(digest):
            with open(issue_file(digest), 'w') as f:
                issue.write(f)
         except IOError as e:
-           print 'IOError : impossible to write on issue file {:s}'.format(issue_file(digest))
-           print 'Verify file permissions'
+           print('IOError : impossible to write on issue file {:s}'.format(issue_file(digest)))
+           print('Verify file permissions')
 
 def open_cmd():
     """Show opened issues"""
@@ -244,16 +255,16 @@ def all_cmd():
 def install_cmd():
 
     """Install command on the system"""
-    print 'File to install :', __file__
+    print('File to install :', __file__)
     default = '/usr/local/bin'
-    print "Folder to install the pit command [{:s}] : ".format(default),
+    print("Folder to install the pit command [{:s}] : ".format(default), end=' ')
     sys.stdout.flush()
-    path = raw_input()
+    path = input()
     if path == '':
         path = default
 
     if not os.path.exists(path):
-        print "error: {:s} does not exist. Installation aborted.".format(path)
+        print("error: {:s} does not exist. Installation aborted.".format(path))
     else:
         if os.path.exists(path+'/pit'):
             if os.path.samefile(path+'/pit', __file__):
@@ -267,7 +278,7 @@ def update_cmd():
         if filename.startswith('pit00'):
             issue = ConfigParser.ConfigParser()
             issue.read(pitdir + '/' + filename)
-            s = StringIO.StringIO()
+            s = io.StringIO()
             issue.write(s)
             digest = sha1digest(s.getvalue())
 
@@ -332,7 +343,7 @@ pit is designed to be simple, self-contained, and compatible with git branching.
 """.format(b=bold, e=end)
 
 if len(sys.argv) == 1 or len(sys.argv) > 3:
-    print usage
+    print(usage)
     exit(0)
 
 cmd = sys.argv[1]
@@ -341,15 +352,15 @@ if cmd not in ['init', 'install', 'man', 'version']:
 
 if len(sys.argv) == 2:
     if cmd not in ['init', 'open', 'install', 'man', 'version', 'closed', 'all', 'update']:
-        print usage
+        print(usage)
     elif cmd == 'init':
         init_cmd()
     elif cmd == 'install':
         install_cmd()
     elif cmd == 'man':
-        print manual
+        print(manual)
     elif cmd == 'version':
-        print __version__
+        print(__version__)
     elif cmd == 'open':
         open_cmd()
     elif cmd == 'closed':
@@ -360,11 +371,10 @@ if len(sys.argv) == 2:
         update_cmd()
 if len(sys.argv) == 3:
     if cmd not in ['add', 'close']:
-        print usage
+        print(usage)
     elif cmd == 'add':
         title = sys.argv[2]
         add_cmd(title)
     elif cmd == 'close':
         digest = sys.argv[2]
         close_cmd(digest)
-