largefiles: use "summaryremotehooks" to avoid redundant outgoing check Before this patch, "hg summary --remote --large" invokes "findcommonoutgoing()" not only in "commands.summary()" but also in "overrides.overridesummary()" (via "getoutgoinglfiles()"). The latter is redundant. This patch uses "summaryremotehooks" to avoid redundant outgoing check. Newly introduced function "overrides.summaryremotehook()" is registered into "summaryremotehooks" to get the result of outgoing check in "commands.summary()". It invokes "lfutil.getlfilestoupload()" directly with the result of outgoing check to avoid redundant outgoing check in "getoutgoinglfiles()".

summary: introduce "summaryremotehooks" to avoid redundant incoming/outgoing check This patch introduces "summaryremotehooks" to avoid redundant incoming/outgoing check for "hg summary" in other than "commands.summary". Only if "--remote" is not specified for "hg summary", hooks registered in "summaryremotehooks" are invoked with "None" as "changes" argument at first, and they should return tuple of two booleans meaning "whether incomings are needed" and "whether outgoings are needed". If no hooks return tuple containing "True", "hg summary" does nothing any more, because incoming/outgoing check is not needed. Otherwise, hooks are invoked again: at this time, "changes" argument refers the result of incoming/outgoing check. This patch also prevents RepoError from being raised if "--remote" is not specified for "hg summary", because of backward compatibility for "hg summary --large" without "--remote".

util: enable "hooks" to return list of the values returned from each hooks

summary: separate checking incoming/outgoing and showing remote summary This patch separates checking incoming/outgoing and showing remote summary, as a preparation for refactoring in succeeding patches, because: - checking incoming/outgoing may be needed, even if "--remote" is not specified for "hg summary" - checking incoming/outgoing may not be needed simultaneously "hg summary --large" without "--remote" is typical case for these.

largefiles: reuse "findcommonoutgoing()" result at "hg push" Before this patch, "hg push" invokes "findcommonoutgoing()" not only in "exchange.push()" but also in "lfilesrepo.push()", when largefiles is enabled. The latter is redundant. This patch registers own "prepushoutgoinghook" function into "prepushoutgoinghooks" of "localrepository" to reuse "findcommonoutgoing()" result. "prepushoutgoinghook" omits "changelog.nodesbetween()" invocation, because "findcommonoutgoing()" invocation in "exchange.push()" takes "onlyheads" argument and it considers "nodesbetween()".

localrepo: introduce "prepushoutgoinghooks" to extend outgoing check easily This patch introduces "prepushoutgoinghooks" to extend outgoing check before pushing changesets to remote easily. This chooses the function returning "util.hooks" instead of the one to be overridden. The latter may cause problems silently, if one of overriders forgets (or fails) to execute a kind of "super(xxx, self).overridden(...)". In the other hand, the former can ensure that all registered functions are invoked, unless one of them raises an exception.

largefiles: centralize the logic to get outgoing largefiles Before this patch, "overrides.getoutgoinglfiles()" (called by "overrideoutgoing()" and "overridesummary()") and "lfilesrepo.push()" implement similar logic to get outgoing largefiles separately. This patch centralizes the logic to get outgoing largefiles in "lfutil.getlfilestoupload()". "lfutil.getlfilestoupload()" takes "addfunc" argument, because each callers need different information (and it is useful for enhancement in the future). - "overrides.getoutgoinglfiles()" needs only filenames - "lfilesrepo.push()" needs only hashes of largefiles

cat: support cat with explicit paths in subrepos The cat command with an explicit path into a subrepo is now handled by invoking cat on the file, from that subrepo. The previous behavior was to complain that the file didn't exist in the revision (of the top most repo). Now when the file is actually missing, the revision of the subrepo is named instead (though it is probably desirable to continue naming the top level repo). The documented output formatters %d and %p reflect the path from the top level repo, since the purpose of this is to give the illusion of a unified repository. Support for the undocumented (for cat) formatters %H, %R, %h, %m and %r was added long ago (I tested back as far as 0.5), but unfortunately these will reflect the subrepo node instead of the parent context. The previous implementation was a bit loose with the return value, i.e. it would return 0 if _any_ file requested was cat'd successfully. This maintains that behavior.

cat: move most of the implementation into cmdutils.cat() This will allow access to the reusable parts from subrepos, similar to add(), forget(), etc.

tests: mark test in tests/test-help.t as contingent on gettext being available