mercurial/transaction.py

Add bash_completion to contrib

Contributed by "Alexis S. L. Carvalho" <[e-mail]>

Attached is a file that implements bash completion for hg.  Just
reading it from your .bashrc should be enough to use it - I think: I'm
using the /etc/bash_completion from debian and I'm not sure whether it
sets some important option.

It gets the list of commands, aliases and options from the output of hg
help and then adds some specific stuff - e.g. completing update with
tags; pull and push with path aliases and directories, etc.

# transaction.py - simple journalling scheme for mercurial
#
# This transaction scheme is intended to gracefully handle program
# errors and interruptions. More serious failures like system crashes
# can be recovered with an fsck-like tool. As the whole repository is
# effectively log-structured, this should amount to simply truncating
# anything that isn't referenced in the changelog.
#
# Copyright 2005 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

import os
import util

class transaction:
    def __init__(self, report, opener, journal, after = None):
        self.journal = None

        # abort here if the journal already exists
        if os.path.exists(journal):
            raise "journal already exists - run hg recover"

        self.report = report
        self.opener = opener
        self.after = after
        self.entries = []
        self.map = {}
        self.journal = journal

        self.file = open(self.journal, "w")

    def __del__(self):
        if self.journal:
            if self.entries: self.abort()
            self.file.close()
            try: os.unlink(self.journal)
            except: pass

    def add(self, file, offset):
        if file in self.map: return
        self.entries.append((file, offset))
        self.map[file] = 1
        # add enough data to the journal to do the truncate
        self.file.write("%s\0%d\n" % (file, offset))
        self.file.flush()

    def close(self):
        self.file.close()
        self.entries = []
        if self.after:
            self.after()
        else:
            os.unlink(self.journal)
        self.journal = None

    def abort(self):
        if not self.entries: return

        self.report("transaction abort!\n")

        for f, o in self.entries:
            try:
                self.opener(f, "a").truncate(o)
            except:
                self.report("failed to truncate %s\n" % f)

        self.entries = []

        self.report("rollback completed\n")

def rollback(opener, file):
    for l in open(file).readlines():
        f, o = l.split('\0')
        opener(f, "a").truncate(int(o))
    os.unlink(file)