#!/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 strip_module_from_spec(mod):
    return re.sub(r'-devel$|-run$', '', re.split('([=><]+)', mod)[0].strip())

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

    for conf in [ '/doc/share/project.txt', '/make/project.conf' ]:
        path = proj_root + conf
        r = ()
        try:
            file = open(path)
        except:
            continue
        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 None
 
def add_modules_from_project_txt(buf, spec, section, key, add_self, recursive,
        names_only):
    name = strip_module_from_spec(spec)
    if names_only:
        spec = name
    if spec in buf:
        return
    if recursive:
        deps = get_value(name, section, key)
        if deps:
            deps = deps.split(',')
            for dep in deps:
                add_modules_from_project_txt(buf, dep,
                        section, key, add_self=True, recursive=True,
                        names_only=names_only)
    if add_self:
        buf.append(name)

def get_modules_from_project_txt(names, section, key, add_self, recursive,
        names_only = True):
    #r = Set()
    r = []
    for name in names:
        add_modules_from_project_txt(r, name, section, key, add_self, recursive,
                names_only)
    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, 'pkg.required', 'run',
            recursive=True, add_self=True, names_only=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, 'pkg.required', 'run',
            recursive=True, add_self=True, names_only=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)

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

global_args = []
skip = 0
for a in sys.argv[1::]:
    global_args.append(a)
    if a in [ '--prefix', '-p' ]:
        skip = 1
        continue
    if skip > 0:
        skip = skip -1
        continue
    if a[0] != '-':
        break

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.prefix
cmd = getattr(sys.modules[__name__], 'cmd_' + args.cmd.replace('-', '_'))
cmd(sys.argv[(len(global_args) + 1)::])