Stefan Monnier [Mon, 18 Apr 2016 16:27:58 +0000 (12:27 -0400)]
* lisp/textmodes/ispell.el: Compile with lexical-binding
(declare-function): Don't define any more.
(ispell-check-minver, ispell-looking-back): Tweak definition so that
the compiler can obviously know that it's always defined.
(ispell-debug-buffer): Declare var.
(ispell-hunspell-fill-dictionary-entry)
(ispell-parse-hunspell-affix-file, ispell-hunspell-add-multi-dic)
(ispell-find-hunspell-dictionaries, ispell-set-spellchecker-params)
(ispell-command-loop): Avoid add-to-list on local variables.
Paul Eggert [Mon, 18 Apr 2016 05:41:14 +0000 (22:41 -0700)]
Minor fixups for external socket launching
* configure.ac (HAVE_LIBSYSTEMD): Change earliest version to 222.
* doc/emacs/misc.texi (Emacs Server):
* etc/NEWS: Spelling and doc fixes.
* src/emacs.c (main) [HAVE_LIBSYSTEMD]:
Check for sd_is_socket returning positive, not zero.
* src/process.c (external_sock_fd): Instead of initializing here ...
(init_process_emacs): ... initialize it here, so that it does the
right thing after dump/restore.
(connect_network_socket): Simplify socket_to_use test.
* lisp/gnus/gnus-art.el (gnus-use-idna): Default to t (since
Emacs comes with IDNA support built in).
(article-decode-idna-rhs): Use `puny-decode-domain' instead of
`idna-to-unicode'.
Matthew Leach [Sat, 16 Apr 2016 09:43:01 +0000 (12:43 +0300)]
Add external socket launching support
* src/process.c (connect_network_socket): Allow a pre-allocated socket
descriptor to be used if passed to Emacs, avoiding the call to
'socket' and 'bind'.
(Fmake_network_process): Allow users to pass ':use-external-socket' in
the parameter plist to use any sockets that have been passed to Emacs.
(wait_reading_process_output): Call 'socket' and 'bind' every time.
(syms_of_process): New symbol ':use-external-socket'.
(set_external_socket_descriptor): New function.
(external_sock_fd): New variable.
* src/lisp.h: (set_external_socket_descriptor): New declaration.
* src/emacs.c (main): Call 'sd_listen_fds' to read the number of sockets
passed and call 'set_external_socket_descriptor' to set the external
socket.
* src/Makefile.in: Add libsystemd library and C flags to the Emacs
compilation options.
* configure.ac: Add new default-on option "systemd" and check for
libsystemd at configure time.
* lisp/server.el (server-start): Set ':use-external-socket' to 't' when
calling 'make-network-process'.
* etc/NEWS: Document new socket-passing functionality and the configure
option to disable systemd interaction.
* doc/emacs/misc.texi (Emacs Server): Document systemd socket passing
functionality and provide systemd unit examples.
* doc/lispref/processes.texi (Network Processes): Document new
'make-network-process' option ':use-external-socket'.
Paul Eggert [Thu, 14 Apr 2016 15:21:34 +0000 (08:21 -0700)]
substitute-command-keys keeps quotes’ text props
Problem reported by Clément Pit--Claudel (Bug#23254).
* src/doc.c: Include intervals.h.
(Fsubstitute_command_keys): If the only substitutions are for
quotes, copy the source string’s text properties too, since no
substring lengths have changed.
Paul Eggert [Thu, 14 Apr 2016 01:19:04 +0000 (18:19 -0700)]
Port ‘./autogen.sh git’ to non-clones
Problem reported by Angelo Graziosi in:
http://lists.gnu.org/archive/html/emacs-devel/2016-04/msg00341.html
* autogen.sh (do_git): Default to false when the arg is ‘all’ but
there is no ‘.git’.
(git_common_dir, hooks): New vars.
(git_config, tailored_hooks, sample_hooks): Use them.
Paul Eggert [Wed, 13 Apr 2016 18:12:15 +0000 (11:12 -0700)]
Do not require that .git be a directory
Problem reportyed by Phillip Lord.
* admin/update_autogen, autogen.sh, build-aux/gitlog-to-emacslog:
* configure.ac, make-dist:
Do not require that .git be a directory, as 'git worktree' makes
it a file and not a directory.
Perform xref searches without visiting unopened files
* lisp/progmodes/xref.el (xref-collect-references): Instead of
calling `semantic-symref-find-references-by-name', use
`semantic-symref-instantiate' and `semantic-symref-perform-search'
directly. Ask for `line-and-text' results (bug#23223).
(xref-collect-matches): Include the line text in the "hit"
structure.
(xref--convert-hits): New function, split off from
`xref-collect-references' and `xref-collect-matches', to convert
"hits" to xref instance list. Create a temporary buffer here, to
use it for post-processing all hit lines.
(xref--collect-matches): Use a different approach for non-visited
files. Insert the line text into the temp buffer, apply the
file's major mode the best we can without reading its whole
contents, syntax-propertize, and search in the result.
(xref--collect-matches-1): Extract, to handle the common logic
between two cases.
(xref--find-buffer-visiting): New function, a wrapper around
`find-buffer-visiting' to amortize its cost.
* lisp/cedet/semantic/symref/idutils.el
(semantic-symref-idutils--line-re): New constant.
(semantic-symref-parse-tool-output-one-line): Support result type
`line-and-text'.
Paul Eggert [Tue, 12 Apr 2016 16:19:11 +0000 (09:19 -0700)]
Support OFFSET and (OFFSET ABBR) time zone rules
This simplifies Gnus and VC time zone support, by letting them
feed the output of ‘current-time-zone’ and ‘decode time’ to
primitives that accept time zone arguments.
* doc/lispref/os.texi (Time Zone Rules, Time Conversion):
* etc/NEWS:
* lisp/gnus/message.el (message-insert-formatted-citation-line):
* lisp/org/org.el (org-timestamp-format):
* src/editfns.c (Fformat_time_string, Fdecode_time):
(Fcurrent_time_string, Fcurrent_time_zone, Fset_time_zone_rule):
Document new behavior.
* lisp/gnus/gmm-utils.el (gmm-format-time-string):
* lisp/vc/add-log.el (add-log-iso8601-time-zone):
Mark as obsolete, as it is now just an alias or narrow wrapper
around format-time-string.
* src/editfns.c (tzlookup): Also support integer OFFSET and
list (OFFSET ABBR) as time zone rules.
(Fencode_time): No longer need a special case for a cons ZONE.
(Fcurrent_time_zone): If the time zone string is missing, compute
it the same way the other new code does.
Paul Eggert [Tue, 12 Apr 2016 15:50:47 +0000 (08:50 -0700)]
Merge from origin/emacs-25
ca50981 Improve time zone documentation c23c965 Prevent bootstrap autoload backup files 9344612 Disable multicolor fonts on OS X since they are not supported... c41ce1c Capitalize “Universal Time” in documentation 10597c9 Don't use 'find-program'
Paul Eggert [Tue, 12 Apr 2016 15:47:15 +0000 (08:47 -0700)]
Improve time zone documentation
* doc/lispref/os.texi (Time Zone Rules):
New section, mostly with material moved here from other sections.
* doc/emacs/cmdargs.texi (General Variables):
* doc/lispref/os.texi (Time Conversion, Time Parsing):
Xref new section.
* etc/NEWS, etc/PROBLEMS:
* lisp/org/org.el (org-timestamp-format):
* src/editfns.c (Fformat_time_string, Fdecode_time)
(Fencode_time, Fcurrent_time_string, Fcurrent_time_zone)
(Fset_time_zone_rule):
When documenting time zone rule strings, mention the TZ
environment variable in preference to mentioning the
sort-of-internal function set-time-zone-rule.
Paul Eggert [Mon, 11 Apr 2016 16:07:16 +0000 (09:07 -0700)]
Merge from origin/emacs-25
b134c20 Sync with gnulib bb30fa9 Fix last change on 2016-01-02 488a72f ; Spelling fixes 9b1aab9 Port run-prolog EMACS to SWI-Prolog 7.2.3 0e7bcec Avoid crashes due to unreasonably large or small text scaling 85f257c Improve documentation of 'with-eval-after-load' 668c7bc Improve handling of non-ASCII characters in Git log messages b570769 Remove undefined behavior in OS X dumper. 97211f3 Fix clipping of xwidgets e87fbc0 Improve Lisp-level documentation of tooltips 9f1786e Faces names should not end in "-face". 3283271 * src/xsmfns.c (syms_of_xsmfns): Remove stray "s in doc strings. a1f221b Comint and compile no longer set EMACS 5c28890 * lisp/subr.el (read-key): Don't let the prompt linger (bug#2... a75b9a6 Merge branch 'emacs-25' of git.savannah.gnu.org:/srv/git/emac... c93ae7a Allow to customize names of executables used by grep.el f6497c6 Set locale encoding to UTF-8 when run from OS X GUI. 7ad1d07 Avoid signaling errors in 'M-n' at the 'C-x C-f' prompt a3f1ac2 Avoid infinite loop in 'studlify-word' f36df4b Don’t recommend obsolete EMACS env var fb0b531 * lisp/emacs-lisp/package.el: Change from a few days ago need...
Paul Eggert [Mon, 11 Apr 2016 16:02:00 +0000 (09:02 -0700)]
Sync with gnulib
This is for picky compilers whose stdint.h fails our C11 tests.
Problem reported for clang by Philipp Stephani (Bug#23261).
This incorporates:
2016-04-11 stdint: port to strict C11 left shift
* doc/misc/texinfo.tex, lib/stdint.in.h: Copy from gnulib.
Leo Liu [Mon, 11 Apr 2016 12:19:38 +0000 (20:19 +0800)]
Fix last change on 2016-01-02
* lisp/emacs-lisp/lisp-mode.el (lisp-el-font-lock-keywords-2): Move
`cl-errs-re' before `lisp--el-match-keyword'; don't use `prepend'
which highlights `cl-errs-re' even in comments or strings.
Paul Eggert [Mon, 11 Apr 2016 05:47:03 +0000 (22:47 -0700)]
Port run-prolog EMACS to SWI-Prolog 7.2.3
* lisp/progmodes/prolog.el (prolog-ensure-process):
Work around incompatibility of SWI-Prolog 7.2.3 and earlier
with the new way of dealing with the EMACS and INSIDE_EMACS
environment variables.
Eli Zaretskii [Sun, 10 Apr 2016 16:50:39 +0000 (19:50 +0300)]
Avoid crashes due to unreasonably large or small text scaling
* lisp/face-remap.el (text-scale-min-amount)
(text-scale-max-amount): New functions.
(text-scale-set, text-scale-increase): Use them to limit the text
scaling to a reasonable range of values. (Bug#23259)
* lisp/net/mailcap.el (mailcap--get-user-mime-data): New function.
(mailcap--set-user-mime-data): New function.
(mailcap-user-mime-data): New customization option.
(mailcap-select-preferred-viewer): New function.
(mailcap-mime-info): Use it.
Eli Zaretskii [Sun, 10 Apr 2016 16:04:33 +0000 (19:04 +0300)]
Improve handling of non-ASCII characters in Git log messages
* lisp/vc/vc-git.el (vc-git-commits-coding-system): Now a defcustom.
(vc-git-log-output-coding-system): New defcustom.
(vc-git-print-log, vc-git-command, vc-git--call): Use
'vc-git-log-output-coding-system' for reading stuff from Git.
Don't override values of 'coding-system-for-read/write' if they
are bound by caller -- this allows the user to force an encoding
via "C-x RET c".
(vc-git-checkin): On MS-Windows, pass the log message via a
temporary file, to work around the limitations on passing
non-ASCII characters via command-line arguments. Force using the
'locale-coding-system' for Git command-line arguments. This fixes
problems with non-ASCII commit log messages on MS-Windows.
(Bug#23076)
* etc/NEWS: Mention the new vc-git related defcustoms.
Michael Albinus [Sun, 10 Apr 2016 08:07:15 +0000 (10:07 +0200)]
Fix Bug#23207
* src/keyboard.c (read_char): Resume idle timers in case of
dbus-event, file-notify-event and config-changed-event.
Reported by Johan Claesson <johanclaesson@bredband.net>. (Bug#23207)
Michael Albinus [Sat, 9 Apr 2016 19:14:40 +0000 (21:14 +0200)]
Add vc-backend and vc-responsible-backend tests
* lisp/vc/vc-hooks.el (vc-file-setprop, vc-file-getprop)
(vc-file-clearprops): Use properties on absolute files.
* test/lisp/vc/vc-tests.el (vc-test--unregister-function):
Clear file properties.
(vc-test--register): Add tests for `vc-backend' and
`vc-responsible-backend'. Catch other errors but `vc-not-supported'.
(vc-test--state, vc-test--checkout-model): Catch other errors
but `vc-not-supported'.
(vc-test--working-revision): Fix test for RCS and SCCS. Catch
other errors but `vc-not-supported'.
(vc-test-src02-state): Mark as an expected failure.
* src/xwidget.c (x_draw_xwidget_glyph_string): Use window_box
instead of calculating the clipping borders manually. Suggested
by YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>.
Eli Zaretskii [Sat, 9 Apr 2016 09:30:59 +0000 (12:30 +0300)]
Improve Lisp-level documentation of tooltips
* doc/lispref/display.texi (Tooltips): New section. (Bug#23246)
(Display): Update the chapter menu.
* doc/lispref/text.texi (Special Properties): Make the "tooltip"
index entry more concrete. Change the cross-reference to point to
"Tooltips" in the ELisp manual.
* doc/lispref/elisp.texi (Top): Update the master menu.
* doc/emacs/frames.texi (Tooltips): Include more customization
variables. Add a cross-reference to the ELisp manual.
Paul Eggert [Fri, 8 Apr 2016 22:33:22 +0000 (15:33 -0700)]
Minor improvements for hash function primitives
* src/fns.c (hashfn_eql): Define in terms of hashfn_equal and
hashfn_eq rather than reaching inside them.
(hashtest_eq, hashtest_eql, hashtest_equal):
Now constants with initializers.
(syms_of_fns): Omit no-longer-needed initialization.
* src/lisp.h (LISPSYM_INITIALLY): New macro.
(DEFINE_LISP_SYMBOL): Use it.
Paul Eggert [Fri, 8 Apr 2016 20:39:17 +0000 (13:39 -0700)]
Comint and compile no longer set EMACS
This mostly restores the change that I reverted on March 23,
fixing most of Bug#20202. The only part of the change that is
still reverted is the change to M-x term, where compatibility with
current Bash constrains us from moving too quickly (Bug#20484).
Problem reported by Phillip Lord in: http://bugs.gnu.org/20484#108
* etc/NEWS: Document this.
* lisp/comint.el (comint-exec-1):
* lisp/net/tramp-sh.el (tramp-remote-process-environment):
* lisp/progmodes/compile.el (compilation-start):
Don’t set EMACS=t in the subsidiary process.
Eli Zaretskii [Fri, 8 Apr 2016 14:45:16 +0000 (17:45 +0300)]
Teach Dired support parallel execution of commands on MS-Windows
* lisp/dired-aux.el (dired-shell-stuff-it): Support
parallel-in-background execution of commands on MS-Windows.
Test 'w32-shell-dos-semantics' instead of the underlying OS
when determining whether addition of 'wait' is needed.
Eli Zaretskii [Fri, 8 Apr 2016 13:54:18 +0000 (16:54 +0300)]
Allow to customize names of executables used by grep.el
* lisp/progmodes/grep.el (grep-find-program): Renamed from
'find-program', which was a variable. All uses changed.
(grep-xargs-program): Renamed from 'xargs-program', which was a
variable. All uses changed.
(grep-program): Now a defcustom rather than a simple variable.
(Bug#23219)
Marcin Borkowski [Fri, 8 Apr 2016 07:57:21 +0000 (10:57 +0300)]
Avoid infinite loop in 'studlify-word'
* lisp/play/studly.el (studlify-region): Call
'forward-word-strictly' and 'backward-word-strictly' instead of
'forward-word' and 'backward-word'. (Bug#19940)
Paul Eggert [Thu, 7 Apr 2016 23:52:01 +0000 (16:52 -0700)]
Don’t recommend obsolete EMACS env var
* doc/misc/efaq.texi (Escape sequences in shell output):
Remove long-obsolete (and now-confusing) notes about
the EMACS environment variable in Emacs 21.1 and earlier.
* doc/misc/efaq.texi (^M in the shell buffer):
* etc/PROBLEMS:
Remove obsolescent recommendation to consult the EMACS environment
variable.
* lisp/progmodes/project.el (project-roots): Implement for the
`transient' project type (bug#23224).
(project-current): Instead of signaling an error, return a
transient project instance rooted in the chosen directory.
Python 3.5, released in mid September 2015, introduced a few new
keywords to better support asynchronous code, "async" and "await"
in particular. See https://www.python.org/dev/peps/pep-0492/ for
details. (Bug#21783)
* lisp/progmodes/python.el (python-rx-constituents): Add async
def/for/with as block-start and async def as defun.
* lisp/progmodes/python.el (python-font-lock-keywords): Add async
def/for/with as keyword.
* test/automated/python-tests.el (python-indent-after-async-block-1,
python-indent-after-async-block-2, python-indent-after-async-block-3,
python-nav-beginning-of-defun-3): New tests to test indentation and
navigation for the async keyword.
Paul Eggert [Wed, 6 Apr 2016 08:22:00 +0000 (01:22 -0700)]
Fix stability confusion in sort-tests
Problem reported by Philipp Stephani (Bug#23205).
* test/automated/sort-tests.el:
(sort-tests--insert-words-sort-and-compare):
Don’t assume that reversing a sorted list is the same
as sorting with the reverse predicate. This is not true
for stable sorts when items compare equal.
lisp/textmodes/css-mode.el (scss-at-ids): New defconst holding
SCSS-specific at-rules.
(css--at-ids): New buffer-local variable holding the list of at-rules
for the current mode.
(css--complete-at-rule): Retrieve at-rules from `css--at-ids`.
(scss-mode): Set `css--at-ids'.
Paul Eggert [Tue, 5 Apr 2016 20:58:57 +0000 (13:58 -0700)]
Avoid describe-key error with lambdas
Problem reported by Sho Takemori (Bug#22716).
* lisp/cedet/mode-local.el (describe-mode-local-overload)
(xref-mode-local-overload): Use function-overload-p instead
of assuming the argument is a symbol.
Paul Eggert [Tue, 5 Apr 2016 14:51:28 +0000 (07:51 -0700)]
Enable GCC warnings in developer builds
However, do not fail; just issue the warnings. Add an option
--enable-gcc-warnings=warn-only to configure, to implement this.
* INSTALL, etc/NEWS: Document this.
* configure.ac (gl_GCC_VERSION_IFELSE): New macro, from coreutils.
(gl_gcc_warnings, WERROR_CFLAGS): Use it to add new option.
Don’t treat --with-x-toolkit=no as a special case when configuring
warnings.
Tao Fang [Mon, 4 Apr 2016 20:21:21 +0000 (22:21 +0200)]
Allow URL using HTTPS proxies using CONNECT
* lisp/url/url-http.el (url-http-find-free-connection): Allow
using proxies (bug#11788).
(url-http-end-of-document-sentinel): Ditto.
(url-http): The protocol may change from http to https and
vice versa.
(url-https-proxy-connect): Allow using CONNECT proxies for https.
Paul Eggert [Mon, 4 Apr 2016 17:30:41 +0000 (10:30 -0700)]
New C macro AUTO_STRING_WITH_LEN
Put a bit less pressure on the garbage collector by defining a
macro that is like AUTO_STRING but also allows null bytes in strings,
and by extending AUTO_STRING to work with any unibyte string.
* src/alloc.c (verify_ascii): Remove; all uses removed.
AUTO_STRING can now be used on non-ASCII unibyte strings.
* src/lisp.h (AUTO_STRING): Now allows non-ASCII unibyte strings.
(AUTO_STRING_WITH_LEN): New macro.
* src/coding.c (from_unicode_buffer):
* src/editfns.c (format_time_string):
* src/emacs-module.c (module_make_string, module_format_fun_env):
* src/fileio.c (Fexpand_file_name):
* src/font.c (font_parse_family_registry):
* src/ftfont.c (ftfont_get_charset):
* src/keymap.c (silly_event_symbol_error):
* src/menu.c (single_menu_item):
* src/sysdep.c (system_process_attributes):
Use AUTO_STRING_WITH_LEN if possible.
* src/emacs-module.c (module_make_function):
* src/fileio.c (report_file_errno, report_file_notify_error):
* src/fns.c (Flocale_info):
* src/sysdep.c (system_process_attributes):
Use AUTO_STRING if possible. This is doable more often now
that AUTO_STRING works on any unibyte string.
Paul Eggert [Mon, 4 Apr 2016 16:42:58 +0000 (09:42 -0700)]
Port redirect-debugging-output to MS-Windows
Suggested by Eli Zaretskii in:
http://lists.gnu.org/archive/html/emacs-devel/2016-04/msg00037.html
* src/print.c [WINDOWSNT]: Include sys/socket.h.
* src/w32.c (sys_dup2): Work around problem with MS-Windows _dup2.
Paul Eggert [Mon, 4 Apr 2016 16:36:30 +0000 (09:36 -0700)]
Port redirect-debugging-output to non-GNU/Linux
Problem reported by Kylie McClain for musl in:
http://lists.gnu.org/archive/html/emacs-devel/2016-03/msg01592.html
* etc/DEBUG, etc/NEWS: Mention this.
* src/callproc.c (child_setup) [!MSDOS]:
* src/dispnew.c (init_display):
* src/emacs.c (main, Fdaemon_initialized):
* src/minibuf.c (read_minibuf_noninteractive):
* src/regex.c (xmalloc, xrealloc):
Prefer symbolic names like STDERR_FILENO to magic numbers like 2,
to make file-descriptor manipulation easier to follow.
* src/emacs.c (relocate_fd) [!WINDOWSNT]: Remove; no longer needed
now that we make sure stdin, stdout and stderr are open. All uses
removed.
(main): Make sure standard FDs are OK. Prefer symbolic names like
EXIT_FAILURE to magic numbers like 1. Use bool for boolean.
* src/lisp.h (init_standard_fds): New decl.
* src/print.c (WITH_REDIRECT_DEBUGGING_OUTPUT) [GNU_LINUX]:
Remove; no longer needed.
(Fredirect_debugging_output): Define on all platforms, not just
GNU/Linux. Redirect file descriptor, not stream, so that the code
works even if stderr is not an lvalue. Report an error if the
file arg is neither a string nor nil.
(syms_of_print): Always define redirect-debugging-output.
* src/sysdep.c (force_open, init_standard_fds): New functions.
Paul Eggert [Mon, 4 Apr 2016 06:12:04 +0000 (23:12 -0700)]
Sync with gnulib
This incorporates:
2016-04-03 stdint: detect good enough pre-C++11 stdint.h in C++ mode
2016-04-01 stddef: support configuring with g++
* doc/misc/texinfo.tex, lib/stddef.in.h, m4/stdint.m4:
Copy from gnulib.
Paul Eggert [Sun, 3 Apr 2016 22:27:21 +0000 (15:27 -0700)]
Fix doc for Universal Time
* doc/lispref/os.texi (Time of Day, Time Conversion):
Be more careful about distinguishing UTC (which is not valid for
pre-1961 time stamps) and UT (which is).
(Time Parsing): Remove stray obsolete paragraph about a
UNIVERSAL argument for ‘format-time-string’.
Paul Eggert [Sun, 3 Apr 2016 20:39:52 +0000 (13:39 -0700)]
Merge from origin/emacs-25
b787d55 More format-time-string change fixups 13c8f29 make-xwidget unused arg cleanup 36e05f0 Remove unused arguments from make-xwidget 1042217 Document incompatible changes in 'format-time-string' 7228eb8 Improve documentation of byte-code objects 0020047 Adapt calls to 'format-time-string' to changes in Emacs 25 17b5152 Improve vc-diff with Git backend c28f87a (js--continued-expression-p): Special-case unary plus and minus 2d02a5f ; * lisp/vc/vc-annotate.el (vc-annotate): Clarify commentary. 9151f16 Prevent C++ Mode wrongly fontifying some identifiers near tem... b3b523c Avoid crashes due to insanely large columns in tabulated-list... a3daa34 Teach M-x disassemble a default argument. e30c3e9 Fix EOL decoding in vc-annotate with SVN back-end on MS-Windows df441b3 Fix OS X specific settings in tramp-tests 2244331 Finish fixing a cacheing bug in CC Mode (see 2016-03-09)
Restore the point in grep buffers when traversing the history
* lisp/progmodes/grep.el (grep-process-setup): Allow moving
point to a specific place after finishing the grep command.
(grep-mode): Use it to restore point after traversing the history.
(grep--history-point): New internal variable.
(grep--save-history, grep-forward-history): Use it to restore
the point.
* doc/emacs/building.texi (Grep Searching): Mention the
`r'/`l' commands.
* lisp/progmodes/grep.el (grep-forward-history): New command.
(grep-backward-history): Ditto.
(grep--save-buffers): New function.
(grep): Use it to record the history.
(grep--command-history, grep--history-inhibit)
(grep--history-place): New internal variables for the grep
history (bug#22627).