path.py

#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2011 Pawel Szostek (pawel.szostek@cern.ch)
#
#    This source code is free software; you can redistribute it
#    and/or modify it in source code form under the terms of the GNU
#    General Public License as published by the Free Software
#    Foundation; either version 2 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, write to the Free Software
#    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
#

import os

def url_basename(url):
    """
    Get basename from an url
    """
    if url.endswith(".git"):
        ret = os.path.basename(url[:-4])
    elif url[-1] == '/':
        ret = os.path.basename(url[:-1])
    else:
        ret = os.path.basename(url)
    return ret

def pathsplit(p, rest=[]):
    (h,t) = os.path.split(p)
    if len(h) < 1: return [t]+rest
    if len(t) < 1: return [h]+rest
    return pathsplit(h,[t]+rest)

def commonpath(l1, l2, common=[]):
    if len(l1) < 1: return (common, l1, l2)
    if len(l2) < 1: return (common, l1, l2)
    if l1[0] != l2[0]: return (common, l1, l2)
    return commonpath(l1[1:], l2[1:], common+[l1[0]])

def is_rel_path(path):
    path = str(path)
    s = path[0]
    if s == '/' or s == '~':
        return False
    return True

def is_abs_path(path):
    path = str(path)
    s = path[0]
    if s == '/':
        return True
    return False
    
def relpath(p1, p2 = None):
    if p2 == None:
        p2 = os.getcwd()
    p1, p2 = p2, p1
    if p1[-1] == '/':
        p1 = p1[:-1]
    if p2[-1] == '/':
        p2 = p2[:-1]

    (common,l1,l2) = commonpath(pathsplit(p1), pathsplit(p2))
    p = []
    if len(l1) > 0:
        p = [ '../' * len(l1) ]
    p = p + l2
    return os.path.join( *p )

#def filter_files(files, extension):
#   

def rel2abs(path, base = None):
    """
    converts a relative path to an absolute path.

    @param path the path to convert - if already absolute, is returned
    without conversion.
    @param base - optional. Defaults to the current directory.
    The base is intelligently concatenated to the given relative path.
    @return the relative path of path from base
    """
    if os.path.isabs(path): return path
    retval = os.path.join(base,path)
    return os.path.abspath(retval)

def search_for_manifest(search_path):
    """
    Look for manifest in the given folder
    """
    import msg as p 
    p.vprint("Looking for manifest in " + search_path)
    for filename in os.listdir(search_path):
        if filename == "manifest.py" and not os.path.isdir(filename):
            return os.path.abspath(os.path.join(search_path, filename))
    # no manifest file found
    return None