#!/usr/bin/python3
##
## This file is part of the sigrok-util project.
##
## Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
##
## This program is free software: you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 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, see <http://www.gnu.org/licenses/>.
##

import os
import sys
import tempfile
from subprocess import Popen, PIPE, check_output
import shutil
import re
import socket
import datetime

TMPL_AUTOCONF_DRIVER = "SR_DRIVER([${name}], [${short}])\n"

TMPL_HWMAKE_DRIVERLIB = """if HW_${upper}
libsigrok_la_SOURCES += \\
	src/hardware/${short}/protocol.h \\
	src/hardware/${short}/protocol.c \\
	src/hardware/${short}/api.c
endif
"""
FILE_DRV_API = 'drv-api.c'
FILE_DRV_PROTOCOL = 'drv-protocol.c'
FILE_DRV_PROTOCOL_H = 'drv-protocol.h'

def tmpl(template):
    out = re.sub(r'\${([^}]+)}', lambda x: str(names[x.group(1)]), template)

    return out


def tmpl_file(filename):
    template = open(TMPLDIR + '/' + filename).read()

    return tmpl(template)


def new_driver():
    tmp = tempfile.mkdtemp()
    try:
        os.chdir(tmp)
        process = Popen(['git', 'clone', '--depth=1', LIBSR],
                        stdout=PIPE, stderr=PIPE)
        out, err = process.communicate()
        if process.returncode:
            raise Exception(err.decode())
        gitdir = tmp + '/libsigrok/'
        do_autoconf(gitdir)
        do_automake(gitdir)
        do_driverskel(gitdir)
        make_patch(gitdir)
    except Exception as e:
        print(e)
    shutil.rmtree(tmp)


# add DRIVER and DRIVER2 entries to configure.ac
def do_autoconf(gitdir):
    cacpath = gitdir + 'configure.ac'
    configure_ac = open(cacpath).read()

    out = ''
    state = 'driver'
    active = False
    for line in configure_ac.split('\n')[:-1]:
        if state == 'driver':
            m = re.match(r'SR_DRIVER\(\[([^\]]+)', line)
            if m:
                active = True
            if active:
                if (m and m.group(1).upper() > names['name'].upper()) or m is None:
                    out += tmpl(TMPL_AUTOCONF_DRIVER)
                    state = 'done'
                    active = False
        out += line + '\n'
    if state != 'done':
        raise Exception('No SR_DRIVER entries found in configure.ac')
    open(cacpath, 'w').write(out)


# add HW_ entry to Makefile.am
def do_automake(gitdir):
    path = gitdir + 'Makefile.am'
    hwmake = open(path).read()

    out = ''
    state = 'copy'
    for line in hwmake.split('\n')[:-1]:
        if state == 'copy' and re.match(r'if\s+HW_\w+$', line):
            state = 'drivers'
        if state == 'drivers':
            m = re.match(r'if\s+HW_(\w+)$', line)
            if m:
                drv_short = m.group(1)
                if drv_short > names['upper']:
                    out += tmpl(TMPL_HWMAKE_DRIVERLIB)
                    state = 'done'
            elif not re.match(r'\s*libsigrok_la_SOURCES\b|\s*src/hardware/|endif\b', line):
                print("[%s]" % line.strip())
                # we passed the last entry
                out += tmpl(TMPL_HWMAKE_DRIVERLIB)
                state = 'done'
        out += line + '\n'
    if state != 'done':
        raise Exception('No "if HW_" markers found in Makefile.am')
    open(path, 'w').write(out)


def do_driverskel(gitdir):
    drvdir = gitdir + 'src/hardware/' + names['short']
    os.mkdir(drvdir)
    open(drvdir + '/api.c', 'w').write(tmpl_file(FILE_DRV_API))
    open(drvdir + '/protocol.c', 'w').write(tmpl_file(FILE_DRV_PROTOCOL))
    open(drvdir + '/protocol.h', 'w').write(tmpl_file(FILE_DRV_PROTOCOL_H))


def make_patch(gitdir):
    os.chdir(gitdir)
    command(['git', 'add', 'src/hardware/' + names['short']])
    cmd = ['git', 'commit',
           '-m', '%s: Initial driver skeleton.' % names['short'],
           'configure.ac', 'Makefile.am',
           'src/hardware/' + names['short']]
    command(cmd)
    cmd = ['git', 'format-patch', 'HEAD~1']
    out, err = Popen(cmd, stdout=PIPE, stderr=PIPE).communicate()
    if err:
        raise Exception(err.decode())
    patch = out.decode().strip()
    shutil.move(gitdir + '/' + patch, scriptdir + '/' + patch)
    print(patch)


def command(cmd):
    out, err = Popen(cmd, stderr=PIPE).communicate()
    if err:
        raise Exception(err.decode())


def parse_gitconfig():
    author = email = None
    try:
        author = check_output(["git", "config", "user.name"]).decode().strip();
        email = check_output(["git", "config", "user.email"]).decode().strip();
    except:
        print("Please set your name and email in your git config")
        sys.exit()
    return author, email

#
# main
#

scriptdir = os.getcwd()
if scriptdir.split('/')[-2:] != ['sigrok-util', 'source']:
	print("Please call this script from the 'source' directory.")
	sys.exit(1)

LIBSR = 'git://sigrok.org/libsigrok'
TMPLDIR = scriptdir

if len(sys.argv) < 2:
    print("Usage: new-driver <name>")
    sys.exit()

author, email = parse_gitconfig()
name = ' '.join(sys.argv[1:])
names = {
    'name': name,
    'short': re.sub('[^a-z0-9]', '-', name.lower()),
    'lib': re.sub('[^a-z0-9]', '_', name.lower()),
    'upper': re.sub('[^A-Z0-9]', '_', name.upper()),
    'year': datetime.datetime.now().year,
    'author': author,
    'email': email,
}
new_driver()