From 5fd2859f1948b0b81a26425ad76967b9ff365781 Mon Sep 17 00:00:00 2001
From: William Ting <io@williamting.com>
Date: Mon, 16 Dec 2013 11:20:40 -0600
Subject: [PATCH] add legacy migration

---
 bin/data.py  | 138 +++++++++++++++++++++++++++++++++++++++++++++++++++
 bin/utils.py |  46 +++++++++++++++++
 2 files changed, 184 insertions(+)
 create mode 100644 bin/data.py
 create mode 100644 bin/utils.py

diff --git a/bin/data.py b/bin/data.py
new file mode 100644
index 0000000..cec8942
--- /dev/null
+++ b/bin/data.py
@@ -0,0 +1,138 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from itertools import imap
+import os
+import pickle
+import platform
+import shutil
+import sys
+
+from utils import decode
+from utils import is_osx
+from utils import is_python3
+from utils import unico as unicode
+
+
+def load(config):
+    xdg_aj_home = os.path.join(
+            os.path.expanduser('~'),
+            '.local',
+            'share',
+            'autojump')
+    legacy_data_file = os.path.join(xdg_aj_home, 'autojump.txt')
+
+    # Older versions incorrectly used Linux XDG_DATA_HOME paths on OS X
+    if is_osx() and os.path.exists(xdg_aj_home):
+        return migrate_legacy_data(config)
+    elif os.path.exists(legacy_data_file):
+        return migrate_legacy_data(config)
+    elif os.path.exists(config['data_file']):
+        return load_pickle(config)
+    return {}
+
+
+def load_pickle(config):
+    with open(config['data_file'], 'rb') as f:
+        data = pickle.load(f)
+    return data
+
+
+def migrate_legacy_data(config):
+    xdg_data_home = os.path.join(os.path.expanduser('~'), '.local', 'share')
+    xdg_aj_home = os.path.join(xdg_data_home, 'autojump')
+    legacy_data = os.path.join(xdg_aj_home, 'autojump.txt')
+    legacy_data_backup = os.path.join(xdg_aj_home, 'autojump.bak')
+
+    assert(os.path.exists(xdg_aj_home), "$XDG_DATA_HOME doesn't exist.")
+
+    # migrate to new file format
+    data = load_legacy(legacy_data, legacy_data_backup)
+    save(config, data)
+
+    # cleanup
+    if is_osx():
+        shutil.rmtree(xdg_aj_home)
+        if len(os.listdir(xdg_data_home)) == 0:
+            shutil.rmtree(xdg_data_home)
+    else:
+        if os.path.exists(legacy_data):
+            os.remove(legacy_data)
+        if os.path.exists(legacy_data_backup):
+            os.remove(legacy_data_backup)
+
+    return data
+
+
+def load_legacy(data_file, data_file_backup):
+    """Loads data from legacy data file."""
+    try:
+        if is_python3():
+            with open(data_file, 'r', encoding='utf-8') as f:
+                lines = f.readlines()
+        else:
+            with open(data_file, 'r') as f:
+                lines = f.readlines()
+    except (IOError, EOFError):
+        return load_legacy_backup(data_file_backup)
+
+    # example: '10.0\t/home/user\n' -> ['10.0', '/home/user']
+    parse = lambda x: x.strip().split('\t')
+    # example: ['10.0', '/home/user'] -> (u'/home/user', 10.0)
+    convert = lambda x: (decode(x[1], 'utf-8'), float(x[0]))
+
+    return dict(imap(convert, imap(parse, lines)))
+
+
+def load_legacy_backup(data_file, data_file_backup):
+    """Loads data from backup data file."""
+    if os.path.exists(data_file_backup):
+        shutil.move(data_file_backup, data_file)
+        return load_legacy(data_file, None)
+    return {}
+
+
+def save(self):
+    """
+    Save database atomically and preserve backup, creating new database if
+    needed.
+    """
+    # check file existence and permissions
+    if ((not os.path.exists(self.filename)) or
+            os.name == 'nt' or
+            os.getuid() == os.stat(self.filename)[4]):
+
+        create_dir_atomically(self.config['data'])
+
+        temp = tempfile.NamedTemporaryFile(
+                dir=self.config['data'],
+                delete=False)
+
+        for path, weight in sorted(self.data.items(),
+                key=operator.itemgetter(1),
+                reverse=True):
+            temp.write((unico("%s\t%s\n" % (weight, path)).encode("utf-8")))
+
+        # catching disk errors and skipping save when file handle can't
+        # be closed.
+        try:
+            # http://thunk.org/tytso/blog/2009/03/15/dont-fear-the-fsync/
+            temp.flush()
+            os.fsync(temp)
+            temp.close()
+        except IOError as ex:
+            print("Error saving autojump database (disk full?)" %
+                    ex, file=sys.stderr)
+            return
+
+        shutil.move(temp.name, self.filename)
+        try: # backup file
+            import time
+            if (not os.path.exists(self.filename+".bak") or
+                    time.time()-os.path.getmtime(self.filename+".bak") \
+                            > 86400):
+                shutil.copy(self.filename, self.filename+".bak")
+        except OSError as ex:
+            print("Error while creating backup autojump file. (%s)" %
+                    ex, file=sys.stderr)
+
diff --git a/bin/utils.py b/bin/utils.py
new file mode 100644
index 0000000..a0ab732
--- /dev/null
+++ b/bin/utils.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from __future__ import division, print_function
+
+import platform
+import sys
+
+
+def is_python2():
+    return sys.version_info[0] > 2
+
+
+def is_python3():
+    return sys.version_info[0] > 3
+
+
+def is_linux():
+    return platform.system() == 'Linux'
+
+
+def is_osx():
+    return platform.system() == 'Darwin'
+
+
+def decode(string, encoding=None, errors="strict"):
+    """
+    Decoding step for Python 2 which does not default to unicode.
+    """
+    if is_python2():
+        return string
+    else:
+        if encoding is None:
+            encoding = sys.getfilesystemencoding()
+        return string.decode(encoding, errors)
+
+
+def unico(string):
+    """
+    If Python 2, convert to a unicode object.
+    """
+    print("custom unicode")
+    if sys.version_info[0] > 2:
+        return string
+    else:
+        return unicode(string)