if DEMO_MODE or MULTI_USER_MODE:
    session.flash = T('disabled in demo mode')
    redirect(URL('default','site'))
if not have_mercurial:
    session.flash=T("Sorry, could not find mercurial installed")
    redirect(URL('default','design',args=request.args(0)))

_hgignore_content = """\
syntax: glob
*~
*.pyc
*.pyo
*.bak
cache/*
databases/*
sessions/*
errors/*
"""

def hg_repo(path):
    import os
    uio = ui.ui()
    uio.quiet = True
    if not os.environ.get('HGUSER') and not uio.config("ui", "username"):
        os.environ['HGUSER'] = 'web2py@localhost'
    try:
        repo = hg.repository(ui=uio, path=path)
    except:
        repo = hg.repository(ui=uio, path=path, create=True)
    hgignore = os.path.join(path, '.hgignore')
    if not os.path.exists(hgignore):
        open(hgignore, 'w').write(_hgignore_content)
    return repo

def commit():
    app = request.args(0)
    path = apath(app, r=request)
    repo = hg_repo(path)
    form = FORM('Comment:',INPUT(_name='comment',requires=IS_NOT_EMPTY()),
                INPUT(_type='submit',_value='Commit'))
    if form.accepts(request.vars,session):
        oldid = repo[repo.lookup('.')]
        cmdutil.addremove(repo)
        repo.commit(text=form.vars.comment)
        if repo[repo.lookup('.')] == oldid:
            response.flash = 'no changes'
    files = TABLE(*[TR(file) for file in repo[repo.lookup('.')].files()])
    changes = TABLE(TR(TH('revision'),TH('description')))
    for change in repo.changelog:
        ctx=repo.changectx(change)
        revision, description = ctx.rev(), ctx.description()
        changes.append(TR(A(revision,_href=URL('revision',
                                               args=(app,revision))),
                          description))
    return dict(form=form,files=files,changes=changes,repo=repo)

def revision():
    app = request.args(0)
    path = apath(app, r=request)
    repo = hg_repo(path)
    revision = request.args(1)
    ctx=repo.changectx(revision)
    form=FORM(INPUT(_type='submit',_value='revert'))
    if form.accepts(request.vars):
        hg.update(repo, revision)
        session.flash = "reverted to revision %s" % ctx.rev()
        redirect(URL('default','design',args=app))
    return dict(
        files=ctx.files(),
        rev=str(ctx.rev()),
        desc=ctx.description(),
        form=form
        )