#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2008, fuller
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#    * Redistributions of source code must retain the above copyright notice,
#      this list of conditions and the following disclaimer.
#    * Redistributions in binary form must reproduce the above copyright
#      notice, this list of conditions and the following disclaimer in the
#      documentation and/or other materials provided with the distribution.
#    * Neither the name of the daemogorgon.net nor the names of its
#      contributors may be used to endorse or promote products derived from
#      this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

"""
DITrack multi-project manager

:Author: $Author: fuller $
:Contact: fuller@daemogorgon.net (http://www.daemogorgon.net/software/ditrack-manager)
:Date: $Date: 2008-10-23 20:50:07 +0200 (Do, 23. Okt 2008) $
:Revision: $Revision: 7 $

"""
import os
from os.path import isdir, isfile, join
from subprocess import Popen
import sys

__version__ = '$Revision: 7 $'

# configuration; change this to your machine
config_path = join(os.environ['HOME'], '.mdt')
projects = join(config_path, 'projects')
current = join(config_path, 'current')
dt = 'dt'

def help():
    print 'mdt help (%s)' % __version__
    print
    print '  mdt -h|--help        this help'
    print '  mdt -l|--list        list projects'
    print '  mdt -c|--current     show current active project path'
    print '  mdt set <project>    define current project path for DITrack'
    print '  mdt act|cat ...      use DITrack commands with current project'
    print
    print
    print 'Specify projects and paths in ~/.mdt/projects:'
    print
    print '  project1   /home/juser/devel/project1'
    print '  project2   /home/juser/devel/project2'
    print

def _write_file(name, content):
    try:
        f = file(name, 'w')
        f.write(content)
    finally:
        f.close()

def _read_file(name):
    content = []
    try:
        f = file(name, 'r')
        for line in f:
            if len(line.strip()):
                content.append(line)
        f.close()
    except IOError:
        return None
    return content

def set(prj):
    # look for path in 'projects' file
    lines = _read_file(projects)
    for line in lines:
        parts = line.split()
        if parts[0] == prj:
            path = parts[1]
            _write_file(current, path)
            return
    print >>sys.stderr, 'Project %s not found.' % prj

def get_current():
    c = _read_file(current)
    if c:
        return c[0]
    else:
        return None

def config_ok():
    if not isdir(config_path):
        return False
    if not isfile(projects):
        return False
    return True

def no_current_project_found():
    print >>sys.stderr, 'No current project found.'
    print >>sys.stderr, "Define projects in %s and use '%s set <project>' to set a current project." % (projects, sys.argv[0])
    print >>sys.stderr
    print >>sys.stderr, 'Example:'
    print >>sys.stderr
    print >>sys.stderr, '  project1   /home/juser/devel/project1'
    print >>sys.stderr, '  project2   /home/juser/devel/project2'
 
def execute_dt(cmd):
    try:
        retcode = call(cmd, shell=True)
    except OSError, e:
        print >>sys.stderr, "Execution of '%s' failed: %s" % (cmd, e)

def main(args):
    if len(args)==0 or args[0] in ['-h', '--help']:
        help()
        sys.exit(0)

    # check for config directory
    if not config_ok():
        print >>sys.stderr, "Please create directory '%s' and file '%s' first." % (config_path, projects)
        print >>sys.stderr, "Then define project to directory mappings in '%s':"
        print >>sys.stderr 
        print >>sys.stderr, '  project_name1     /home/to_user/path/to/project'
        print >>sys.stderr, '  project_name2     /home/to_user/path/to/another_project'
        sys.exit(1)

    elif len(args) > 0:
        if args[0] in ['-c', '--current']:
            # show current project
            current = get_current()
            if current:
                print current
            else:
                no_current_project_found()
        elif args[0] in ['-l', '--list']:
            # show all known projects
            print 'Known projects:'
            for prj in _read_file(projects):
                print prj[:-1]
        elif args[0] == 'set':
            if len(args) < 2:
                print >>sys.stderr, 'You must specify a project.'
            else:
                set(args[1])
        else:
            current = get_current()
            if not current:
                no_current_project_found()
                sys.exit()
            cmd = dt + ' -d ' + current + ' ' + ' '.join(args),
            execute_dt(cmd)


# skip script name
main(sys.argv[1:])

# vim:tabstop=4:shiftwidth=4:smarttab:expandtab:softtabstop=4:autoindent