~abentley/bzrtools/bzrtools.dev

#!/usr/bin/python

import sys

class HunkSelector:

    class Option:

        def __init__(self, char, action, help, default=False):

            self.char = char

            self.action = action

            self.default = default

            self.help = help

    standard_options = [

        Option('n', 'shelve', 'shelve this change for the moment.',

            default=True),

        Option('y', 'keep', 'keep this change in your tree.'),

        Option('d', 'done', 'done, skip to the end.'),

        Option('i', 'invert', 'invert the current selection of all hunks.'),

        Option('s', 'status', 'show status of hunks.'),

        Option('q', 'quit', 'quit')

    ]

    end_options = [

        Option('y', 'continue', 'proceed to shelve selected changes.',

            default=True),

        Option('r', 'restart', 'restart the hunk selection loop.'),

        Option('s', 'status', 'show status of hunks.'),

        Option('i', 'invert', 'invert the current selection of all hunks.'),

        Option('q', 'quit', 'quit')

    ]

    def __init__(self, patches):

        self.patches = patches

        self.total_hunks = 0

        for patch in patches:

            for hunk in patch.hunks:

                # everything's shelved by default

                hunk.selected = True

                self.total_hunks += 1

    def __get_option(self, char):

        for opt in self.standard_options:

            if opt.char == char:

                return opt

        raise Exception('Option "%s" not found!' % char)

    def __select_loop(self):

        j = 0

        for patch in self.patches:

            i = 0

            lasti = -1

            while i < len(patch.hunks):

                hunk = patch.hunks[i]

                if lasti != i:

                    print patch.get_header(), hunk

                    j += 1

                lasti = i

                prompt = 'Keep this change? (%d of %d)' \

                            % (j, self.total_hunks)

                if hunk.selected:

                    self.__get_option('n').default = True

                    self.__get_option('y').default = False

                else:

                    self.__get_option('n').default = False

                    self.__get_option('y').default = True

                action = self.__ask_user(prompt, self.standard_options)

                if action == 'keep':

                    hunk.selected = False

                elif action == 'shelve':

                    hunk.selected = True

                elif action == 'done':

                    return True

                elif action == 'invert':

                    self.__invert_selection()

                    self.__show_status()

                    continue

                elif action == 'status':

                    self.__show_status()

                    continue

                elif action == 'quit':

                    return False

                i += 1

        return True

    def select(self):

        if self.total_hunks == 0:

            return []

        done = False

        while not done:

            if not self.__select_loop():

                return []

            while True:

                self.__show_status()

                prompt = "Shelve these changes, or restart?"

                action = self.__ask_user(prompt, self.end_options)

                if action == 'continue':

                    done = True

                    break

                elif action == 'quit':

                    return []

                elif action == 'status':

                    self.__show_status()

                elif action == 'invert':

                    self.__invert_selection()

                elif action == 'restart':

                    break

        for patch in self.patches:

            tmp = []

            for hunk in patch.hunks:

                if hunk.selected:

                    tmp.append(hunk)

            patch.hunks = tmp

        tmp = []

        for patch in self.patches:

            if len(patch.hunks):

                tmp.append(patch)

        self.patches = tmp

        return self.patches

    def __invert_selection(self):

        for patch in self.patches:

            for hunk in patch.hunks:

                if hunk.__dict__.has_key('selected'):

                    hunk.selected = not hunk.selected

                else:

                    hunk.selected = True

    def __show_status(self):

        print '\nStatus:'

        for patch in self.patches:

            print '  %s' % patch.oldname

            shelve = 0

            keep = 0

            for hunk in patch.hunks:

                if hunk.selected:

                    shelve += 1

                else:

                    keep += 1

            print '    %d hunks to be shelved' % shelve

            print '    %d hunks to be kept' % keep

            print

    if sys.platform == "win32":

        import msvcrt

        def __getchar(self):

            return msvcrt.getche()

    else:

        def __getchar(self):

            import tty

            import termios

            fd = sys.stdin.fileno()

            settings = termios.tcgetattr(fd)

            try:

                tty.setraw(fd)

                ch = sys.stdin.read(1)

            finally:

                termios.tcsetattr(fd, termios.TCSADRAIN, settings)

            return ch

    def __ask_user(self, prompt, options):

        while True:

            sys.stdout.write(prompt)

            sys.stdout.write(' [')

            for opt in options:

                if opt.default:

                    default = opt

                sys.stdout.write(opt.char)

            sys.stdout.write('?] (%s): ' % default.char)

            response = self.__getchar()

            # default, which we see as newline, is 'n'

            if response in ['\n', '\r', '\r\n']:

                response = default.char

            print response # because echo is off

            for opt in options:

                if opt.char == response:

                    return opt.action

            for opt in options:

                print '  %s - %s' % (opt.char, opt.help)