Add coding guidelines for writing Perl scripts for Git.

* tz/perl-styles:
  Update CodingGuidelines for Perl

Instead of requiring the full 40-hex object names on the index
line, we can read submodule commit object names from the textual
diff when synthesizing a fake ancestore tree for "git am -3".

* jc/extended-fake-ancestor-for-gitlink:
  apply: verify submodule commit object name better

contrib/subtree updates, but here are only the ones that looked
ready.  The remainder of the patches will have another day.

* dg/subtree-fixes:
  contrib/subtree: make the manual directory if needed
  contrib/subtree: honor DESTDIR
  contrib/subtree: fix synopsis
  contrib/subtree: better error handling for 'subtree add'
  contrib/subtree: use %B for split subject/body
  contrib/subtree: remove test number comments

* maint:
  Replace filepattern with pathspec for consistency

pathspec is the most widely used term, and is the one defined in
gitglossary.txt. <filepattern> was used only in the synopsys for git-add
and git-commit, and in git-add.txt. Get rid of it.

This patch is obtained with by running:

  perl -pi -e 's/filepattern/pathspec/' `git grep -l filepattern`
Signed-off-by: NMatthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Signed-off-by: NJunio C Hamano <gitster@pobox.com>

* maint:
  user-manual: Rewrite git-gc section for automatic packing
  user-manual: Fix 'you - Git' -> 'you--Git' typo
  user-manual: Fix 'http' -> 'HTTP' typos
  user-manual: Fix 'both: so' -> 'both; so' typo

This should have happened back in 2007, when `git gc` learned about
auto (e9831e83, git-gc --auto: add documentation, 2007-09-17).
Signed-off-by: NW. Trevor King <wking@tremily.us>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Use an em-dash, not a hyphen, to join these clauses.
Signed-off-by: NW. Trevor King <wking@tremily.us>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

HTTP is an acronym which has not (yet) made the transition to word
status (unlike "laser", probably because lasers are inherently cooler
than HTTP ;).
Signed-off-by: NW. Trevor King <wking@tremily.us>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

The smart HTTP clients forgot to verify the content-type that comes
back from the server side to make sure that the request is being
handled properly.

* sp/smart-http-content-type-check:
  http_request: reset "type" strbuf before adding
  t5551: fix expected error output
  Verify Content-Type from smart HTTP servers

The clause "so `git log ...` will return no commits..." is
independent, not a description of "both", so a semicolon is more
appropriate.
Signed-off-by: NW. Trevor King <wking@tremily.us>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

* 'master' of git://github.com/git-l10n/git-po:
  l10n: de.po: translate "reset" as "neu setzen"
  l10n: de.po: translate "revision" consistently as "Revision"
  l10n: de.po: translate 11 new messages
  l10n: zh_CN.po: 800+ new translations on command usages
  l10n: Update Swedish translation (1983t0f0u)
  l10n: vi.po: updated Vietnamese translation
  l10n: Update git.pot (11 new, 7 removed messages)
  l10n: de.po: fix some minor issues

We used to have an arbitrary 32 limit for combined diff input,
resulting in incorrect number of leading colons shown when showing
the "--raw --cc" output.

* jc/combine-diff-many-parents:
  t4038: add tests for "diff --cc --raw <trees>"
  combine-diff: lift 32-way limit of combined diff

Make sure the similarity value shown in the "apply --summary"
output is sensible, even when the input had a bogus value.

* jk/apply-similaritly-parsing:
  builtin/apply: tighten (dis)similarity index parsing

The "complete with known paths only" update to completion scripts
returns directory names without trailing slash to compensate the
addition of '/' done by bash that reads from our completion result.
tcsh completion code that reads from our internal completion result
does not add '/', so let it ask our complletion code to keep the '/'
at the end.

* mk/tcsh-complete-only-known-paths:
  completion: handle path completion and colon for tcsh script

The completion script used to let the default completer to suggest
pathnames, which gave too many irrelevant choices (e.g. "git add"
would not want to add an unmodified path).  Teach it to use a more
git-aware logic to enumerate only relevant ones.

* mp/complete-paths:
  git-completion.bash: add support for path completion

The autoconf subsystem passed --mandir down to generated
config.mak.autogen but forgot to do the same for --htmldir.

* ct/autoconf-htmldir:
  Honor configure's htmldir switch

According to the glossary, "reset" should be
translated as "neu setzen" but in a couple of
messages we've translated it as "zurücksetzen".
This fixes that.
Signed-off-by: NRalf Thielow <ralf.thielow@gmail.com>

In the current German translation, the word "revision" was
translated as both "Version" (translation of "commit") and
"Revision". Since a revision in Git is not necessarily a
commit, we should not translate it with the same word in
order to give the user an idea that it's not necessarily
the same. After this commit, "revision" is consistently
translated as "Revision".
Signed-off-by: NRalf Thielow <ralf.thielow@gmail.com>

Translate 11 new messages came from git.pot update
in 46bc4039 (l10n: Update git.pot (11 new, 7 removed
messages)).
Signed-off-by: NRalf Thielow <ralf.thielow@gmail.com>
Acked-by: NThomas Rast <trast@inf.ethz.ch>

Most of the 800+ new translations are contributed by Wang Sheng.
So he is a zh_CN l10n maintainer for Git now.

Also fixed translations for some terms, such as blob, dangling.
Signed-off-by: NWang Sheng <wangsheng2008love@163.com>
Signed-off-by: NJiang Xin <worldhello.net@gmail.com>

Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Signed-off-by: NJunio C Hamano <gitster@pobox.com>

"git cherry-pick" did not replay a root commit to an unborn branch.

* mz/pick-unborn:
  learn to pick/revert into unborn branch
  tests: move test_cmp_rev to test-lib-functions

* nd/fix-perf-parameters-in-tests:
  test-lib.sh: unfilter GIT_PERF_*

Scripts to test bash completion was inherently flaky as it was
affected by whatever random things the user may have on $PATH.

* jc/do-not-let-random-file-interfere-with-completion-tests:
  t9902: protect test from stray build artifacts

A failure to push due to non-ff while on an unborn branch
dereferenced a NULL pointer when showing an error message.

* ft/transport-report-segv:
  push: fix segfault when HEAD points nowhere

We forgot to close the file descriptor reading from "gpg" output,
killing "git log --show-signature" on a long history.

* sb/gpg-plug-fd-leak:
  gpg: close stderr once finished with it in verify_signed_buffer()

Rebasing the history of superproject with change in the submodule
has been broken since v1.7.12.

* jc/fake-ancestor-with-non-blobs:
  apply: diagnose incomplete submodule object name better
  apply: simplify build_fake_ancestor()
  git-am: record full index line in the patch used while rebasing

Buggy versions of ccache broke the auto-generation of dependencies.

* jn/auto-depend-workaround-buggy-ccache:
  Makefile: explicitly set target name for autogenerated dependencies

Build on top of the clean-up done by jk/mergetool and automatically
generate the list of mergetool and difftool backends the build
supports to be included in the documentation.

* da/mergetool-docs:
  doc: generate a list of valid merge tools
  mergetool--lib: list user configured tools in '--tool-help'
  mergetool--lib: add functions for finding available tools
  mergetool--lib: improve the help text in guess_merge_tool()
  mergetool--lib: simplify command expressions

Update mergetools to work better with newer merge helper tortoise ships.

* ss/mergetools-tortoise:
  mergetools: teach tortoisemerge to handle filenames with SP correctly
  mergetools: support TortoiseGitMerge

Cleans up mergetool/difftool combo.

* jk/mergetool:
  mergetools: simplify how we handle "vim" and "defaults"
  mergetool--lib: don't call "exit" in setup_tool
  mergetool--lib: improve show_tool_help() output
  mergetools/vim: remove redundant diff command
  git-difftool: use git-mergetool--lib for "--tool-help"
  git-mergetool: don't hardcode 'mergetool' in show_tool_help
  git-mergetool: remove redundant assignment
  git-mergetool: move show_tool_help to mergetool--lib

* jk/doc-makefile-cleanup:
  Documentation/Makefile: clean up MAN*_TXT lists

"git help remote-helpers" did not work; 'remote-helpers' is not
a subcommand name but a concept, so its documentation should have
been in gitremote-helpers, not git-remote-helpers.

* jk/remote-helpers-doc:
  Rename {git- => git}remote-helpers.txt

* sb/run-command-fd-error-reporting:
  run-command: be more informative about what failed

Fix various error messages and conditions in "git branch", e.g. we
advertised "branch -d/-D" to remove one or more branches but actually
implemented removal of zero or more branches---request to remove no
branches was not rejected.

* nd/branch-error-cases:
  branch: let branch filters imply --list
  docs: clarify git-branch --list behavior
  branch: mark more strings for translation
  branch: give a more helpful message on redundant arguments
  branch: reject -D/-d without branch name

* sb/gpg-i18n:
  gpg: allow translation of more error messages