#!/usr/bin/python -u

import sys
import argparse
from sets import Set
from os.path import expanduser
import re

def re_section(name):
    return re.compile('[' + name + ']'
                 '.*?'
                 '(?=[)',
                 re.DOTALL)

# --------------------------------------------------------------------- helpers

def get_section(path, section):
    r = ''
    file = open(path)
    pat = '[' + section + ']'
    in_section = False
    for line in file:
        if (line.rstrip() == pat):
            in_section = True
            continue
        if in_section:
            if len(line) and line[0] == '[':
                break
            r = r + line
    file.close()
    return r.rstrip()
 
def get_value(name, section, key):
    proj_root = projs_root + '/' + name
    if section == 'version':
        with open(proj_root + '/VERSION', 'r') as file:
            r=file.read().replace('\n', '').replace('-dev', '')
            file.close()
            return r

    path = proj_root + '/doc/share/project.txt'
    r = ()
    file = open(path)
    if not len(section):
        for line in file:
            r = re.findall('^ *' + key + ' *= *(.*)', line)
            if (len(r) > 0):
                break
    else:
        in_section = False
        pat = '[' + section + ']'
        for line in file:
            if (line.rstrip() == pat):
                in_section = True
                continue
            if in_section:
                if len(line) and line[0] == '[':
                    break
                r = re.findall('^ *' + key + ' *= *(.*)', line)
                if (len(r) > 0):
                    break
    file.close()
    if len(r):
        return r[0]
    return ""
 
def add_modules_from_project_txt(buf, name, section, key, add_self, recursive):
    if name in buf:
        return
    if add_self:
        buf.add(name)
    deps = get_value(name, section, key).split()
    for dep in deps:
        buf.add(dep)
        if recursive:
            add_modules_from_project_txt(buf, dep, section, key, True, recursive)

def get_modules_from_project_txt(names, section, key, add_self, recursive):
    r = Set()
    for name in names:
        add_modules_from_project_txt(r, name, section, key, add_self, recursive)
    return r

# --------------------------------------------------------------------- commands

def cmd_test(args_):
    parser = argparse.ArgumentParser(description='Test')
    parser.add_argument('blah', default='', help='The blah argument')
    args=parser.parse_args(args_)
    print "blah = " + args.blah

def cmd_ldlibpath(args_):
    parser = argparse.ArgumentParser(description='ldlibpath')
    parser.add_argument('module', nargs='*', help='Modules')
    args=parser.parse_args(args_)
    deps = get_modules_from_project_txt(args.module, 'requires', 'run', True,
            True)
    r = ''
    for m in deps:
        r = r + ':' + projs_root + '/' + m + '/lib'
    print r[1:]

def cmd_path(args_):
    parser = argparse.ArgumentParser(description='path')
    parser.add_argument('module', nargs='*', help='Modules')
    args=parser.parse_args(args_)
    deps = get_modules_from_project_txt(args.module, 'requires', 'run', True,
            True)
    r = ''
    for m in deps:
        r = r + ':' + projs_root + '/' + m + '/bin'
    print r[1:]

def cmd_pkg_requires(args_):
    parser = argparse.ArgumentParser(description='pkg-requires')
    parser.add_argument('flavour', help='Flavour')
    parser.add_argument('module', nargs='*', help='Modules')
    args=parser.parse_args(args_)
    r = []
    for m in args.module:
        deps = get_value(m, 'pkg.required', args.flavour).split(',')
        for spec in deps:
            dep = re.split('([=><]+)', spec)
            for i, item in enumerate(dep):
                dep[i] = item.strip()
            if len(dep) == 3:
                dep_project = re.sub(r'-devel$|-run$', '', dep[0])
                version = get_value(dep_project, 'version', '')
                if dep[2] == 'VERSION':
                    dep[2] = version.split('-')[0]
                elif dep[2] == 'VERSION-REVISION':
                    dep[2] = version
                else:
                    raise Exception("Unknown version specifier in " + spec)
            r.append(' '.join(dep))
    print ', '.join(r)

global_args = []
for a in sys.argv[1::]:
    global_args.append(a)
    if a[0] != '-':
        break

# -------------------------------------------------------------------- here we go

parser = argparse.ArgumentParser(description='Project metadata evaluation')
parser.add_argument('cmd', default='', help='Command')
parser.add_argument('--prefix', '-p', nargs='?', default = expanduser("~") + '/local/src/cvs.stable/proj', help='Project Path Prefix')
parser.add_argument('arg', nargs='*', help='Command arguments')
args=parser.parse_args(global_args)
projs_root = args.p
cmd = getattr(sys.modules[__name__], 'cmd_' + args.cmd.replace('-', '_'))
cmd(sys.argv[(len(global_args) + 1)::])