Merged code to manipulate version control systems

Supports git, hg and bzr.

5 files changed, 1209 insertions, 0 deletions

diff --git a/ranger/vcs/__init__.py b/ranger/vcs/__init__.py
new file mode 100644
index 00000000..bb696178
--- /dev/null
+++ b/ranger/vcs/__init__.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# vcs - a python module to handle various version control systems
+# Copyright 2011 Abdó Roig-Maranges <abdo.roig@gmail.com>
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+
+from .vcs import VcsError, Vcs
+
+# vim: expandtab:shiftwidth=4:tabstop=4:softtabstop=4:textwidth=80
diff --git a/ranger/vcs/bzr.py b/ranger/vcs/bzr.py
new file mode 100644
index 00000000..2bd0c27a
--- /dev/null
+++ b/ranger/vcs/bzr.py
@@ -0,0 +1,266 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# vcs - a python module to handle various version control systems
+# Copyright 2012 Abdó Roig-Maranges <abdo.roig@gmail.com>
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import re
+import shutil
+from datetime import datetime
+
+from .vcs import Vcs, VcsError
+
+
+class Bzr(Vcs):
+    vcsname  = 'bzr'
+    HEAD="last:1"
+
+    # Auxiliar stuff
+    #---------------------------
+
+    def _bzr(self, path, args, silent=True, catchout=False, bytes=False):
+        return self._vcs(path, 'bzr', args, silent=silent, catchout=catchout, bytes=bytes)
+
+
+    def _sanitize_rev(self, rev):
+        if rev == None: return None
+        rev = rev.strip()
+        if len(rev) == 0: return None
+
+        return rev
+
+
+    def _log(self, refspec=None, filelist=None):
+        """Gets a list of dicts containing revision info, for the revisions matching refspec"""
+        args = ['log', '-n0', '--show-ids']
+        if refspec: args = args + ["-r", refspec]
+
+        if filelist: args = args + filelist
+
+        raw = self._bzr(self.path, args, catchout=True, silent=True)
+        L = re.findall('-+$(.*?)^-', raw + '\n---', re.MULTILINE | re.DOTALL)
+
+        log = []
+        for t in L:
+            t = t.strip()
+            if len(t) == 0: continue
+
+            dt = {}
+            m = re.search('^revno:\s*([0-9]+)\s*$', t, re.MULTILINE)
+            if m: dt['short'] = m.group(1).strip()
+            m = re.search('^revision-id:\s*(.+)\s*$', t, re.MULTILINE)
+            if m: dt['revid'] = m.group(1).strip()
+            m = re.search('^committer:\s*(.+)\s*$', t, re.MULTILINE)
+            if m: dt['author'] = m.group(1).strip()
+            m = re.search('^timestamp:\s*(.+)\s*$', t, re.MULTILINE)
+            if m: dt['date'] = datetime.strptime(m.group(1).strip(), '%a %Y-%m-%d %H:%M:%S %z')
+            m = re.search('^message:\s*^(.+)$', t, re.MULTILINE)
+            if m: dt['summary'] = m.group(1).strip()
+            log.append(dt)
+        return log
+
+
+    def _hg_file_status(self, st):
+        st = st.strip()
+        if   st in "AM":     return 'staged'
+        elif st in "D":      return 'deleted'
+        elif st in "?":      return 'untracked'
+        else:                return 'unknown'
+
+
+
+    # Repo creation
+    #---------------------------
+
+    def init(self):
+        """Initializes a repo in current path"""
+        self._bzr(self.path, ['init'])
+        self.update()
+
+
+    def clone(self, src):
+        """Clones a repo from src"""
+        path = os.path.dirname(self.path)
+        name = os.path.basename(self.path)
+        try:
+            os.rmdir(self.path)
+        except OSError:
+            raise VcsError("Can't clone to %s. It is not an empty directory" % self.path)
+
+        self._bzr(path, ['branch', src, name])
+        self.update()
+
+
+
+    # Action Interface
+    #---------------------------
+
+    def commit(self, message):
+        """Commits with a given message"""
+        self._bzr(self.path, ['commit', '-m', message])
+
+
+    def add(self, filelist=None):
+        """Adds files to the index, preparing for commit"""
+        if filelist != None: self._bzr(self.path, ['add'] + filelist)
+        else:                self._bzr(self.path, ['add'])
+
+
+    def reset(self, filelist=None):
+        """Removes files from the index"""
+        if filelist != None: self._bzr(self.path, ['remove', '--keep', '--new'] + filelist)
+        else:                self._bzr(self.path, ['remove', '--keep', '--new'])
+
+
+    def pull(self):
+        """Pulls a git repo"""
+        self._bzr(self.path, ['pull'])
+
+
+    def push(self):
+        """Pushes a git repo"""
+        self._bzr(self.path, ['push'])
+
+
+    def checkout(self, rev):
+        """Checks out a branch or revision"""
+        self._bzr(self.path, ['update', '-r', rev])
+
+
+    def extract_file(self, rev, name, dest):
+        """Extracts a file from a given revision and stores it in dest dir"""
+        if rev == self.INDEX:
+            shutil.copyfile(os.path.join(self.path, name), dest)
+        else:
+            out = self._bzr(self.path, ['cat', '--r', rev, name], catchout=True, bytes=True)
+            with open(dest, 'wb') as fd: fd.write(out)
+
+
+
+    # Data Interface
+    #---------------------------
+
+    def get_status_allfiles(self):
+        """Returns a dict indexed by files not in sync their status as values.
+           Paths are given relative to the root."""
+        raw = self._bzr(self.path, ['status', '--short', '--no-classify'], catchout=True, bytes=True)
+        L = re.findall('^(..)\s*(.*?)\s*$', raw.decode('utf-8'), re.MULTILINE)
+        ret = {}
+        for st, p in L:
+            sta = self._bzr_file_status(st)
+            ret[p.strip()] = sta
+        return ret
+
+
+    def get_ignore_allfiles(self):
+        """Returns a set of all the ignored files in the repo"""
+        raw = self._bzr(self.path, ['ls', '--ignored'], catchout=True)
+        return set(raw.split('\n'))
+
+
+    # TODO: slow due to net access
+    def get_remote_status(self):
+        """Checks the status of the repo regarding sync state with remote branch"""
+        if self.get_remote() == None:
+            return "none"
+
+        ahead = behind = True
+        try:
+            self._bzr(self.path, ['missing', '--mine-only'], silent=True)
+        except:
+            ahead = False
+
+        try:
+            self._bzr(self.path, ['missing', '--theirs-only'], silent=True)
+        except:
+            behind = False
+
+        if       ahead and     behind: return "diverged"
+        elif     ahead and not behind: return "ahead"
+        elif not ahead and     behind: return "behind"
+        elif not ahead and not behind: return "sync"
+
+
+    def get_branch(self):
+        """Returns the current named branch, if this makes sense for the backend. None otherwise"""
+        branch = self._bzr(self.path, ['nick'], catchout=True)
+        return branch or None
+
+
+    def get_log(self, filelist=None, maxres=None):
+        """Get the entire log for the current HEAD"""
+        return self._log(refspec=None, filelist=filelist)
+
+
+    def get_raw_log(self, filelist=None):
+        """Gets the raw log as a string"""
+        args = ['log']
+        if filelist: args = args + filelist
+        return self._bzr(self.path, args, catchout=True)
+
+
+    def get_raw_diff(self, refspec=None, filelist=None):
+        """Gets the raw diff as a string"""
+        args = ['diff', '--git']
+        if refspec:  args = args + [refspec]
+        if filelist: args = args + filelist
+        return self._bzr(self.path, args, catchout=True)
+
+
+    def get_remote(self):
+        """Returns the url for the remote repo attached to head"""
+        remote = self._bzr(self.path, ['config', 'parent_location'], catchout=True)
+        return remote.strip() or None
+
+
+    def get_revision_id(self, rev=None):
+        """Get a canonical key for the revision rev"""
+        if rev == None: rev = self.HEAD
+        elif rev == self.INDEX: return None
+        rev = self._sanitize_rev(rev)
+        L = self._log(refspec=rev)
+        if len(L) == 0: return None
+        else:           return L[0]['revid']
+
+
+    def get_info(self, rev=None):
+        """Gets info about the given revision rev"""
+        if rev == None: rev = self.HEAD
+        rev = self._sanitize_rev(rev)
+
+        L = self._log(refspec=rev)
+        if len(L) == 0:
+            raise VcsError("Revision %s does not exist" % rev)
+        elif len(L) > 1:
+            raise VcsError("More than one instance of revision %s ?!?" % rev)
+        else:
+            return L[0]
+
+
+    def get_files(self, rev=None):
+        """Gets a list of files in revision rev"""
+        if rev == None: rev = self.HEAD
+        rev = self._sanitize_rev(rev)
+
+        if rev:
+            if rev == self.INDEX:  raw = self._bzr(self.path, ["ls"], catchout=True)
+            else:                  raw = self._bzr(self.path, ['ls', '--R', '-V', '-r', rev], catchout=True)
+            return raw.split('\n')
+        else:
+            return []
+
+# vim: expandtab:shiftwidth=4:tabstop=4:softtabstop=4:textwidth=80
diff --git a/ranger/vcs/git.py b/ranger/vcs/git.py
new file mode 100644
index 00000000..9df27b39
--- /dev/null
+++ b/ranger/vcs/git.py
@@ -0,0 +1,303 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# vcs - a python module to handle various version control systems
+# Copyright 2011, 2012 Abdó Roig-Maranges <abdo.roig@gmail.com>
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import re
+import shutil
+from datetime import datetime
+
+from .vcs import Vcs, VcsError
+
+
+class Git(Vcs):
+    vcsname  = 'git'
+
+    # Auxiliar stuff
+    #---------------------------
+
+    def _git(self, path, args, silent=True, catchout=False, bytes=False):
+        return self._vcs(path, 'git', args, silent=silent, catchout=catchout, bytes=bytes)
+
+
+    def _head_ref(self):
+        """Gets HEAD's ref"""
+        ref = self._git(self.path, ['symbolic-ref', self.HEAD], catchout=True, silent=True)
+        return ref.strip() or None
+
+
+    def _remote_ref(self, ref):
+        """Gets remote ref associated to given ref"""
+        if ref == None: return None
+        remote = self._git(self.path, ['for-each-ref', '--format=%(upstream)', ref], catchout=True, silent=True)
+        return remote.strip() or None
+
+
+    def _sanitize_rev(self, rev):
+        if rev == None: return None
+        return rev.strip()
+
+
+    def _log(self, refspec=None, maxres=None, filelist=None):
+        """Gets a list of dicts containing revision info, for the revisions matching refspec"""
+        fmt = '--pretty=%h %H%nAuthor: %an <%ae>%nDate: %ct%nSubject: %s%n'
+
+        args = ['--no-pager', 'log', fmt]
+        if refspec:  args = args + ['-1', refspec]
+        elif maxres: args = args + ['-%d' % maxres]
+
+        if filelist: args = args + ['--'] + filelist
+
+        raw = self._git(self.path, args, catchout=True)
+        L = re.findall('^\s*(\w*)\s*(\w*)\s*^Author:\s*(.*)\s*^Date:\s*(.*)\s*^Subject:\s*(.*)\s*', raw, re.MULTILINE)
+
+        log = []
+        for t in L:
+            dt = {}
+            dt['short'] = t[0].strip()
+            dt['revid'] = t[1].strip()
+            dt['author'] = t[2].strip()
+            m = re.match('\d+(\.\d+)?', t[3].strip())
+            dt['date'] = datetime.fromtimestamp(float(m.group(0)))
+            dt['summary'] = t[4].strip()
+            log.append(dt)
+        return log
+
+
+    def _git_file_status(self, st):
+        if len(st) != 2: raise VcsError("Wrong git file status string: %s" % st)
+        X, Y = (st[0], st[1])
+        if   X in " "      and Y in " " : return 'sync'
+        elif X in "MADRC"  and Y in " " : return 'staged'
+        elif X in "MADRC " and Y in "M":  return 'changed'
+        elif X in "MARC "  and Y in "D":  return 'deleted'
+        elif X in "U" or Y in "U":        return 'conflict'
+        elif X in "A" and Y in "A":       return 'conflict'
+        elif X in "D" and Y in "D":       return 'conflict'
+        elif X in "?" and Y in "?":       return 'untracked'
+        elif X in "!" and Y in "!":       return 'ignored'
+        else:                             return 'unknown'
+
+
+
+    # Repo creation
+    #---------------------------
+
+    def init(self):
+        """Initializes a repo in current path"""
+        self._git(self.path, ['init'])
+        self.update()
+
+
+    def clone(self, src):
+        """Clones a repo from src"""
+        name = os.path.basename(self.path)
+        path = os.path.dirname(self.path)
+        try:
+            os.rmdir(self.path)
+        except OSError:
+            raise VcsError("Can't clone to %s. It is not an empty directory" % self.path)
+
+        self._git(path, ['clone', src, name])
+        self.update()
+
+
+
+    # Action interface
+    #---------------------------
+
+    def commit(self, message):
+        """Commits with a given message"""
+        self._git(self.path, ['commit', '-m', message])
+
+
+    def add(self, filelist=None):
+        """Adds files to the index, preparing for commit"""
+        if filelist != None: self._git(self.path, ['add', '-A'] + filelist)
+        else:                self._git(self.path, ['add', '-A'])
+
+
+    def reset(self, filelist=None):
+        """Removes files from the index"""
+        if filelist != None: self._git(self.path, ['reset'] + filelist)
+        else:                self._git(self.path, ['reset'])
+
+
+    def pull(self, br=None):
+        """Pulls from remote"""
+        if br: self._git(self.path, ['pull', br])
+        else:  self._git(self.path, ['pull'])
+
+
+    def push(self, br=None):
+        """Pushes to remote"""
+        if br: self._git(self.path, ['push', br])
+        else:  self._git(self.path, ['push'])
+
+
+    def checkout(self, rev):
+        """Checks out a branch or revision"""
+        self._git(self.path, ['checkout', self._sanitize_rev(rev)])
+
+
+    def extract_file(self, rev, name, dest):
+        """Extracts a file from a given revision and stores it in dest dir"""
+        if rev == self.INDEX:
+            shutil.copyfile(os.path.join(self.path, name), dest)
+        else:
+            out = self._git(self.path, ['--no-pager', 'show', '%s:%s' % (self._sanitize_rev(rev), name)],
+                            catchout=True, bytes=True)
+            with open(dest, 'wb') as fd: fd.write(out)
+
+
+
+    # Data Interface
+    #---------------------------
+
+    def get_status_allfiles(self):
+        """Returns a dict indexed by files not in sync their status as values.
+           Paths are given relative to the root."""
+        raw = self._git(self.path, ['status', '--porcelain'], catchout=True, bytes=True)
+        L = re.findall('^(..)\s*(.*?)\s*$', raw.decode('utf-8'), re.MULTILINE)
+        ret = {}
+        for st, p in L:
+            sta = self._git_file_status(st)
+            if 'R' in st:
+                m = re.match('^(.*)\->(.*)$', p)
+                if m: ret[m.group(2).strip()] = sta
+                else: ret[p.strip()] = sta
+            else:
+                ret[p.strip()] = sta
+        return ret
+
+
+    def get_ignore_allfiles(self):
+        """Returns a set of all the ignored files in the repo"""
+        raw = self._git(self.path, ['ls-files', '--others', '-i', '--exclude-standard'], catchout=True)
+        return set(raw.split('\n'))
+
+
+    def get_remote_status(self):
+        """Checks the status of the repo regarding sync state with remote branch"""
+        try:
+            head = self._head_ref()
+            remote = self._remote_ref(head)
+        except VcsError:
+            head = remote = None
+
+        if head and remote:
+            raw = self._git(self.path, ['rev-list', '--left-right', '%s...%s' % (remote, head)], catchout=True)
+            ahead  = re.search("^>", raw, flags=re.MULTILINE)
+            behind = re.search("^<", raw, flags=re.MULTILINE)
+
+            if       ahead and     behind: return "diverged"
+            elif     ahead and not behind: return "ahead"
+            elif not ahead and     behind: return "behind"
+            elif not ahead and not behind: return "sync"
+        else:                            return "none"
+
+
+    def get_branch(self):
+        """Returns the current named branch, if this makes sense for the backend. None otherwise"""
+        try:
+            head = self._head_ref()
+        except VcsError:
+            head = None
+
+        if head:
+            m = re.match('refs/heads/([^/]*)', head)
+            if m: return m.group(1).strip()
+        else:
+            return "detached"
+
+        return None
+
+
+    def get_log(self, filelist=None, maxres=None):
+        """Get the entire log for the current HEAD"""
+        return self._log(refspec=None, maxres=maxres, filelist=filelist)
+
+
+    def get_raw_log(self, filelist=None):
+        """Gets the raw log as a string"""
+        args = ['log']
+        if filelist: args = args + ['--'] + filelist
+        return self._git(self.path, args, catchout=True)
+
+
+    def get_raw_diff(self, refspec=None, filelist=None):
+        """Gets the raw diff as a string"""
+        args = ['diff']
+        if refspec:  args = args + [refspec]
+        if filelist: args = args + ['--'] + filelist
+        return self._git(self.path, args, catchout=True)
+
+
+    def get_remote(self):
+        """Returns the url for the remote repo attached to head"""
+        if self.is_repo():
+            try:
+                ref = self._head_ref()
+                remote = self._remote_ref(ref)
+            except VcsError:
+                ref = remote = None
+
+            if remote:
+                m = re.match('refs/remotes/([^/]*)/', remote)
+                if m:
+                    url = self._git(self.path, ['config', '--get', 'remote.%s.url' % m.group(1)], catchout=True)
+                    return url.strip() or None
+        return None
+
+
+    def get_revision_id(self, rev=None):
+        """Get a canonical key for the revision rev"""
+        if rev == None: rev = self.HEAD
+        elif rev == self.INDEX: return None
+        rev = self._sanitize_rev(rev)
+
+        return self._sanitize_rev(self._git(self.path, ['rev-parse', rev], catchout=True))
+
+
+    def get_info(self, rev=None):
+        """Gets info about the given revision rev"""
+        if rev == None: rev = self.HEAD
+        rev = self._sanitize_rev(rev)
+
+        L = self._log(refspec=rev)
+        if len(L) == 0:
+            raise VcsError("Revision %s does not exist" % rev)
+        elif len(L) > 1:
+            raise VcsError("More than one instance of revision %s ?!?" % rev)
+        else:
+            return L[0]
+
+
+    def get_files(self, rev=None):
+        """Gets a list of files in revision rev"""
+        if rev == None: rev = self.HEAD
+        rev = self._sanitize_rev(rev)
+
+        if rev:
+            if rev == self.INDEX:  raw = self._git(self.path, ["ls-files"], catchout=True)
+            else:                  raw = self._git(self.path, ['ls-tree', '--name-only', '-r', rev], catchout=True)
+            return raw.split('\n')
+        else:
+            return []
+
+# vim: expandtab:shiftwidth=4:tabstop=4:softtabstop=4:textwidth=80
diff --git a/ranger/vcs/hg.py b/ranger/vcs/hg.py
new file mode 100644
index 00000000..df5940dd
--- /dev/null
+++ b/ranger/vcs/hg.py
@@ -0,0 +1,271 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# vcs - a python module to handle various version control systems
+# Copyright 2011, 2012 Abdó Roig-Maranges <abdo.roig@gmail.com>
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import re
+import shutil
+from datetime import datetime
+from configparser import RawConfigParser
+
+from .vcs import Vcs
+
+
+class Hg(Vcs):
+    vcsname  = 'hg'
+    HEAD = 'tip'
+    # Auxiliar stuff
+    #---------------------------
+
+    def _hg(self, path, args, silent=True, catchout=False, bytes=False):
+        return self._vcs(path, 'hg', args, silent=silent, catchout=catchout, bytes=bytes)
+
+
+    def _sanitize_rev(self, rev):
+        if rev == None: return None
+        rev = rev.strip()
+        if len(rev) == 0: return None
+        if rev[-1] == '+': rev = rev[:-1]
+
+        try:
+            if int(rev) == 0: return None
+        except:
+            pass
+
+        return rev
+
+
+    def _log(self, refspec=None, maxres=None, filelist=None):
+
+        fmt = "changeset: {rev}:{node}\ntag: {tags}\nuser: {author}\ndate: {date}\nsummary: {desc}\n"
+        args = ['log', '--template', fmt]
+
+        if refspec:  args = args + ['--limit', '1', '-r', refspec]
+        elif maxres: args = args + ['--limit', str(maxres)]
+
+        if filelist: args = args + filelist
+
+        raw = self._hg(self.path, args, catchout=True)
+        L = re.findall('^changeset:\s*([0-9]*):([0-9a-zA-Z]*)\s*$\s*^tag:\s*(.*)\s*$\s*^user:\s*(.*)\s*$\s*^date:\s*(.*)$\s*^summary:\s*(.*)\s*$', raw, re.MULTILINE)
+
+        log = []
+        for t in L:
+            dt = {}
+            dt['short'] = t[0].strip()
+            dt['revid'] = self._sanitize_rev(t[1].strip())
+            dt['author'] = t[3].strip()
+            m = re.match('\d+(\.\d+)?', t[4].strip())
+            dt['date'] = datetime.fromtimestamp(float(m.group(0)))
+            dt['summary'] = t[5].strip()
+            log.append(dt)
+        return log
+
+
+    def _hg_file_status(self, st):
+        if len(st) != 1: raise VcsError("Wrong hg file status string: %s" % st)
+        if   st in "ARM":    return 'staged'
+        elif st in "!":      return 'deleted'
+        elif st in "I":      return 'ignored'
+        elif st in "?":      return 'untracked'
+        elif st in "X":      return 'conflict'
+        elif st in "C":      return 'sync'
+        else:                return 'unknown'
+
+
+
+    # Repo creation
+    #---------------------------
+
+    def init(self):
+        """Initializes a repo in current path"""
+        self._hg(self.path, ['init'])
+        self.update()
+
+
+    def clone(self, src):
+        """Clones a repo from src"""
+        name = os.path.basename(self.path)
+        path = os.path.dirname(self.path)
+        try:
+            os.rmdir(self.path)
+        except OSError:
+            raise VcsError("Can't clone to %s. It is not an empty directory" % self.path)
+
+        self._hg(path, ['clone', src, name])
+        self.update()
+
+
+
+    # Action Interface
+    #---------------------------
+
+    def commit(self, message):
+        """Commits with a given message"""
+        self._hg(self.path, ['commit', '-m', message])
+
+
+    def add(self, filelist=None):
+        """Adds files to the index, preparing for commit"""
+        if filelist != None: self._hg(self.path, ['addremove'] + filelist)
+        else:                self._hg(self.path, ['addremove'])
+
+
+    def reset(self, filelist=None):
+        """Removes files from the index"""
+        if filelist == None: filelist = self.get_status_allfiles().keys()
+        self._hg(self.path, ['forget'] + filelist)
+
+
+    def pull(self):
+        """Pulls a hg repo"""
+        self._hg(self.path, ['pull', '-u'])
+
+
+    def push(self):
+        """Pushes a hg repo"""
+        self._hg(self.path, ['push'])
+
+
+    def checkout(self, rev):
+        """Checks out a branch or revision"""
+        self._hg(self.path, ['update', rev])
+
+
+    def extract_file(self, rev, name, dest):
+        """Extracts a file from a given revision and stores it in dest dir"""
+        if rev == self.INDEX:
+            shutil.copyfile(os.path.join(self.path, name), dest)
+        else:
+            self._hg(self.path, ['cat', '--rev', rev, '--output', dest, name])
+
+
+    # Data Interface
+    #---------------------------
+
+    def get_status_allfiles(self):
+        """Returns a dict indexed by files not in sync their status as values.
+           Paths are given relative to the root."""
+        raw = self._hg(self.path, ['status'], catchout=True, bytes=True)
+        L = re.findall('^(.)\s*(.*?)\s*$', raw.decode('utf-8'), re.MULTILINE)
+        ret = {}
+        for st, p in L:
+            # Detect conflict by the existence of .orig files
+            if st == '?' and re.match('^.*\.orig\s*$', p):  st = 'X'
+            sta = self._hg_file_status(st)
+            ret[p.strip()] = sta
+        return ret
+
+
+    def get_ignore_allfiles(self):
+        """Returns a set of all the ignored files in the repo"""
+        raw = self._hg(self.path, ['status', '-i'], catchout=True, bytes=True)
+        L = re.findall('^I\s*(.*?)\s*$', raw.decode('utf-8'), re.MULTILINE)
+        return set(L)
+
+
+    def get_remote_status(self):
+        """Checks the status of the repo regarding sync state with remote branch"""
+        if self.get_remote() == None:
+            return "none"
+
+        ahead = behind = True
+        try:
+            self._hg(self.path, ['outgoing'], silent=True)
+        except:
+            ahead = False
+
+        try:
+            self._hg(self.path, ['incoming'], silent=True)
+        except:
+            behind = False
+
+        if       ahead and     behind: return "diverged"
+        elif     ahead and not behind: return "ahead"
+        elif not ahead and     behind: return "behind"
+        elif not ahead and not behind: return "sync"
+
+
+    def get_branch(self):
+        """Returns the current named branch, if this makes sense for the backend. None otherwise"""
+        branch = self._hg(self.path, ['branch'], catchout=True)
+        return branch or None
+
+
+    def get_log(self, filelist=None, maxres=None):
+        """Get the entire log for the current HEAD"""
+        return self._log(refspec=None, maxres=maxres, filelist=filelist)
+
+
+    def get_raw_log(self, filelist=None):
+        """Gets the raw log as a string"""
+        args = ['log']
+        if filelist: args = args + filelist
+        return self._hg(self.path, args, catchout=True)
+
+
+    def get_raw_diff(self, refspec=None, filelist=None):
+        """Gets the raw diff as a string"""
+        args = ['diff', '--git']
+        if refspec:  args = args + [refspec]
+        if filelist: args = args + filelist
+        return self._hg(self.path, args, catchout=True)
+
+
+    def get_remote(self, rev=None):
+        """Returns the url for the remote repo attached to head"""
+        remote = self._hg(self.path, ['showconfig', 'paths.default'], catchout=True)
+        return remote or None
+
+
+    def get_revision_id(self, rev=None):
+        """Get a canonical key for the revision rev"""
+        if rev == None: rev = self.HEAD
+        elif rev == self.INDEX: return None
+        rev = self._sanitize_rev(rev)
+
+        return self._sanitize_rev(self._hg(self.path, ['-q', 'identify', '--id', '-r', rev], catchout=True))
+
+
+    def get_info(self, rev=None):
+        """Gets info about the given revision rev"""
+        if rev == None: rev = self.HEAD
+        rev = self._sanitize_rev(rev)
+
+        L = self._log(refspec=rev)
+        if len(L) == 0:
+            raise VcsError("Revision %s does not exist" % rev)
+        elif len(L) > 1:
+            raise VcsError("More than one instance of revision %s ?!?" % rev)
+        else:
+            return L[0]
+
+
+    def get_files(self, rev=None):
+        """Gets a list of files in revision rev"""
+        if rev == None: rev = self.HEAD
+        rev = self._sanitize_rev(rev)
+
+        if rev:
+            if rev == self.INDEX: raw = self._hg(self.path, ['locate', "*"], catchout=True)
+            else:                 raw = self._hg(self.path, ['locate', '--rev', rev, "*"], catchout=True)
+            return raw.split('\n')
+        else:
+            return []
+
+
+# vim: expandtab:shiftwidth=4:tabstop=4:softtabstop=4:textwidth=80
diff --git a/ranger/vcs/vcs.py b/ranger/vcs/vcs.py
new file mode 100644
index 00000000..6aa21784
--- /dev/null
+++ b/ranger/vcs/vcs.py
@@ -0,0 +1,345 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# vcs - a python module to handle various version control systems
+# Copyright 2011, 2012 Abdó Roig-Maranges <abdo.roig@gmail.com>
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import subprocess
+from datetime import datetime
+
+
+class VcsError(Exception):
+    def __init__(self, msg):
+        super().__init__(msg)
+
+
+class Vcs(object):
+    """ This class represents a version controlled path, abstracting the usual
+        operations from the different supported backends.
+
+        The backends are declared in te variable self.repo_types, and are derived
+        classes from Vcs with the following restrictions:
+
+         * do NOT implement __init__. Vcs takes care of this.
+
+         * do not create change internal state. All internal state should be
+           handled in Vcs
+
+        Objects from backend classes should never be created directly. Instead
+        create objects of Vcs class. The initialization calls update, which takes
+        care of detecting the right Vcs backend to use and dynamically changes the
+        object type accordingly.
+        """
+
+    # These are abstracted revs, representing the current index (staged files),
+    # the current head and nothing. Every backend should redefine them if the
+    # version control has a similar concept, or implement _sanitize_rev method to
+    # clean the rev before using them
+    INDEX    = "INDEX"
+    HEAD     = "HEAD"
+    NONE     = "NONE"
+    vcsname  = None
+
+    # Possible status responses
+    FILE_STATUS   = ['conflict', 'untracked', 'deleted', 'changed', 'staged', 'ignored', 'sync', 'none', 'unknown']
+    REMOTE_STATUS = ['none', 'sync', 'behind', 'ahead', 'diverged', 'unknown']
+
+
+    def __init__(self, path, vcstype=None):
+        # This is a bit hackish, but I need to import here to avoid circular imports
+        from .git import Git
+        from .hg  import Hg
+        from .bzr import Bzr
+        self.repo_types  = {'git': Git, 'hg': Hg, 'bzr': Bzr}
+
+        self.path = os.path.expanduser(path)
+        self.status = {}
+        self.ignored = set()
+        self.root = None
+
+        self.update(vcstype=vcstype)
+
+
+    # Auxiliar
+    #---------------------------
+
+    def _vcs(self, path, cmd, args, silent=False, catchout=False, bytes=False):
+        """Executes a vcs command"""
+        with open('/dev/null', 'w') as devnull:
+            if silent: out=devnull
+            else:      out=None
+            try:
+                if catchout:
+                    raw = subprocess.check_output([cmd] + args, stderr=out, cwd=path)
+                    if bytes: return raw
+                    else:     return raw.decode('utf-8', errors="ignore").strip()
+                else:
+                    subprocess.check_call([cmd] + args, stderr=out, stdout=out, cwd=path)
+            except subprocess.CalledProcessError:
+                raise VcsError("%s error on %s. Command: %s" % (cmd, path, ' '.join([cmd] + args)))
+
+
+    def _path_contains(self, parent, path):
+        """Checks wether path is an object belonging to the subtree in parent"""
+        if parent == path: return true
+        return os.path.commonprefix([parent, path]) == parent
+
+
+    # Object manipulation
+    #---------------------------
+    # This may be a little hacky, but very useful. An instance of Vcs class changes its own class
+    # when calling update(), to match the right repo type. I can have the same object adapt to
+    # the path repo type, if this ever changes!
+
+    def get_repo_type(self, path):
+        """Returns the right repo type for path. None if no repo present in path"""
+        for rn, rt in self.repo_types.items():
+            if path and os.path.exists(os.path.join(path, '.%s' % rn)): return rt
+        return None
+
+
+    def get_root(self, path):
+        """Finds the repository root path. Otherwise returns none"""
+        curpath = os.path.abspath(path)
+        while curpath != '/':
+            if self.get_repo_type(curpath): return curpath
+            else:                           curpath = os.path.dirname(curpath)
+        return None
+
+
+    def update(self, vcstype=None):
+        """Updates the repo instance. Re-checks the repo and changes object class if repo type changes
+           If vcstype is given, uses that repo type, without autodetection"""
+        if os.path.exists(self.path):
+            self.root = self.get_root(self.path)
+            if vcstype:
+                if vcstype in self.repo_types:
+                    ty = self.repo_types[vcstype]
+                else:
+                    raise VcsError("Unrecognized repo type %s" % vcstype)
+            else:
+                ty = self.get_repo_type(self.root)
+            if ty:
+                self.__class__ = ty
+                return
+
+        self.__class__ = Vcs
+
+
+    # Repo creation
+    #---------------------------
+
+    def init(self, repotype):
+        """Initializes a repo in current path"""
+        if not repotype in self.repo_types:
+            raise VcsError("Unrecognized repo type %s" % repotype)
+
+        if not os.path.exists(self.path): os.makedirs(self.path)
+        rt = self.repo_types[repotype]
+        try:
+            self.__class__ = rt
+            self.init()
+        except:
+            self.__class__ = Vcs
+            raise
+
+
+    def clone(self, repotype, src):
+        """Clones a repo from src"""
+        if not repotype in self.repo_types:
+            raise VcsError("Unrecognized repo type %s" % repotype)
+
+        if not os.path.exists(self.path): os.makedirs(self.path)
+        rt = self.repo_types[repotype]
+        try:
+            self.__class__ = rt
+            self.clone(src)
+        except:
+            self.__class__ = Vcs
+            raise
+
+
+    # Action interface
+    #---------------------------
+
+    def commit(self, message):
+        """Commits with a given message"""
+        raise NotImplementedError
+
+
+    def add(self, filelist):
+        """Adds files to the index, preparing for commit"""
+        raise NotImplementedError
+
+
+    def reset(self, filelist):
+        """Removes files from the index"""
+        raise NotImplementedError
+
+
+    def pull(self):
+        """Pulls from remote"""
+        raise NotImplementedError
+
+
+    def push(self):
+        """Pushes to remote"""
+        raise NotImplementedError
+
+
+    def checkout(self, rev):
+        """Checks out a branch or revision"""
+        raise NotImplementedError
+
+
+    def extract_file(self, rev, name, dest):
+        """Extracts a file from a given revision and stores it in dest dir"""
+        raise NotImplementedError
+
+
+    # Data
+    #---------------------------
+
+    def is_repo(self):
+        """Checks wether there is an initialized repo in self.path"""
+        return self.path and os.path.exists(self.path) and self.root != None
+
+
+    def is_tracking(self):
+        """Checks whether HEAD is tracking a remote repo"""
+        return self.get_remote(self.HEAD) != None
+
+
+    def get_file_status(self, path):
+        """Returns the status for a given path regarding the repo"""
+
+        # if path is relative, join it with root. otherwise do nothing
+        path = os.path.join(self.root, path)
+
+        if os.path.commonprefix([self.root, path]) == self.root:
+            prel = os.path.relpath(path, self.root)
+            if prel in self.ignored:   return "ignored"
+            if os.path.isdir(path):
+                sts = set([st for p, st in self.status.items()
+                           if self._path_contains(path, os.path.join(self.root, p))]) | set(['sync'])
+                for st in self.FILE_STATUS:
+                    if st in sts: return st
+            else:
+                if prel in self.status:  return self.status[prel]
+                else:                    return "sync"
+        else:
+            return "none"
+
+
+    def get_status(self, path=None):
+        """Returns a dict with changed files under path and their status.
+           If path is None, returns all changed files"""
+
+        self.status = self.get_status_allfiles()
+        self.ignored = self.get_ignore_allfiles()
+        if path:
+            path = os.path.join(self.root, path)
+            if os.path.commonprefix([self.root, path]) == self.root:
+                return {p: st for p, st in self.status.items() if self._path_contains(path, os.path.join(self.root, p))}
+            else:
+                return {}
+        else:
+            return self.status
+
+
+    def get_status_allfiles(self):
+        """Returns a dict indexed by files not in sync their status as values.
+           Paths are given relative to the root."""
+        raise NotImplementedError
+
+
+    def get_ignore_allfiles(self):
+        """Returns a set of all the ignored files in the repo"""
+        raise NotImplementedError
+
+
+    def get_remote_status(self):
+        """Checks the status of the entire repo"""
+        raise NotImplementedError
+
+
+    def get_branch(self):
+        """Returns the current named branch, if this makes sense for the backend. None otherwise"""
+        raise NotImplementedError
+
+
+    def get_log(self):
+        """Get the entire log for the current HEAD"""
+        raise NotImplementedError
+
+
+    def get_raw_log(self, filelist=None):
+        """Gets the raw log as a string"""
+        raise NotImplementedError
+
+
+    def get_raw_diff(self, refspec=None, filelist=None):
+        """Gets the raw diff as a string"""
+        raise NotImplementedError
+
+
+    def get_remote(self):
+        """Returns the url for the remote repo attached to head"""
+        raise NotImplementedError
+
+
+    def get_revision_id(self, rev=None):
+        """Get a canonical key for the revision rev"""
+        raise NotImplementedError
+
+
+    def get_info(self, rev=None):
+        """Gets info about the given revision rev"""
+        raise NotImplementedError
+
+
+    def get_files(self, rev=None):
+        """Gets a list of files in revision rev"""
+        raise NotImplementedError
+
+
+
+    # I / O
+    #---------------------------
+
+    def print_log(self, fmt):
+        log = self.log()
+        if fmt == "compact":
+            for dt in log:
+                print(self.format_revision_compact(dt))
+        else:
+            raise Exception("Unknown format %s" % fmt)
+
+
+    def format_revision_compact(self, dt):
+        return "{0:<10}{1:<20}{2}".format(dt['revshort'],
+                                          dt['date'].strftime('%a %b %d, %Y'),
+                                          dt['summary'])
+
+
+    def format_revision_text(self, dt):
+        L = ["revision:         %s:%s" % (dt['revshort'], dt['revhash']),
+             "date:             %s" % dt['date'].strftime('%a %b %d, %Y'),
+             "time:             %s" % dt['date'].strftime('%H:%M'),
+             "user:             %s" % dt['author'],
+             "description:      %s" % dt['summary']]
+        return '\n'.join(L)