version: factor out mapping of internal/external labels Prepares for formatter support, where translation should be disabled conditionally.

version: always build list of extension versions This patch just moves "if ui.verbose:" to the inner loop, as preparation for formatter support.

formatter: add fm.nested(field) to either write or build sub items We sometimes need to build nested items by formatter, but there was no convenient way other than building and putting them manually by fm.data(): exts = [] for n, v in extensions: fm.plain('%s %s\n' % (n, v)) exts.append({'name': n, 'ver': v}) fm.data(extensions=exts) This should work for simple cases, but doing this would make it harder to change the underlying data type for better templating support. So this patch provides fm.nested(field), which returns new nested formatter (or self if items aren't structured and just written to ui.) A nested formatter stores items which will later be rendered by the parent formatter. fn = fm.nested('extensions') for n, v in extensions: fn.startitem() fn.write('name ver', '%s %s\n', n, v) fn.end() Nested items are directly exported to a template for now: {extensions % "{name} {ver}\n"} There's no {extensions} nor {join(extensions, sep)} yet. I have a plan for them by extending fm.nested() API, but I want to revisit it after trying out this API in the real world.

formatter: factor out format*() functions to separate classes New converter classes will be reused by a nested formatter. See the next patch for details. This change is also good in that the default values are defined uniquely by the baseformatter.

crecord: restore SIGWINCH handler before return Previously, the SIGWINCH handler does not get cleared and if the commit message editor also needs SIGWINCH handling (like vim), the two SIGWINCH handlers (the editor's, ours) will have a race. And we may erase the editor's screen content. This patch restores SIGWINCH handler to address the above issue.

bdiff: implement cffi version of bdiff