MI: Add new command -complete

There is a CLI command 'complete' intended to use with emacs. Such a command
would also be useful for MI frontends, when separate CLI and MI channels cannot
be used. For example, on Windows (because of lack of PTYs) or when GDB is used
through SSH session.

This commit adds a new '-complete' MI command.

gdb/Changelog:
2019-01-28  Jan Vrany  <jan.vrany@fit.cvut.cz>

	* mi/mi-cmds.h (mi_cmd_complete): New function.
	* mi/mi-main.c (mi_cmd_complete): Likewise.
	* mi/mi-cmds.c: Define new MI command -complete.
	* NEWS: Mention new -complete command.

gdb/doc/ChangeLog:
2019-01-28  Jan Vrany  <jan.vrany@fit.cvut.cz>

	* gdb.texinfo (Miscellaneous GDB/MI Commands): Document new
	MI command -complete.

gdb/testsuite/ChangeLog:
2019-01-28  Jan Vrany  <jan.vrany@fit.cvut.cz>

	* gdb.mi/mi-complete.exp: New file.
	* gdb.mi/mi-complete.cc: Likewise.

gdb/ChangeLog

@@ -1,3 +1,10 @@
+2019-01-28  Jan Vrany  <jan.vrany@fit.cvut.cz>
+
+	* mi/mi-cmds.h (mi_cmd_complete): New function.
+	* mi/mi-main.c (mi_cmd_complete): Likewise.
+	* mi/mi-cmds.c: Define new MI command -complete.
+	* NEWS: Mention new -complete command.
+
 2019-01-24  Jan Vrany  <jan.vrany@fit.cvut.cz>
 
 	* completer.h (complete): New function.

gdb/NEWS

@@ -46,6 +46,13 @@ show print max-depth
   The default max-depth is 20, but this can be set to unlimited to get
   the old behavior back.
 
+* New MI commands
+
+-complete
+  This lists all the possible completions for the rest of the line, if it
+  were to be given as a command itself.  This is intended for use by MI
+  frontends in cases when separate CLI and MI channels cannot be used.
+
 *** Changes in GDB 8.3
 
 * GDB and GDBserver now support access to additional registers on

gdb/doc/ChangeLog

@@ -1,3 +1,8 @@
+2019-01-28  Jan Vrany  <jan.vrany@fit.cvut.cz>
+
+	* gdb.texinfo (Miscellaneous GDB/MI Commands): Document new
+	MI command -complete.
+
 2019-05-14  Tom de Vries  <tdevries@suse.de>
 
 	* gdb.texinfo (Automatic symbol index cache): Add concept and command

gdb/doc/gdb.texinfo

@@ -34538,6 +34538,71 @@ fullname="/home/nickrob/myprog.c",line="73",arch="i386:x86_64"@}
 (gdb)
 @end smallexample
 
+@subheading The @code{-complete} Command
+@findex -complete
+
+@subheading Synopsis
+
+@smallexample
+-complete @var{command}
+@end smallexample
+
+Show a list of completions for partially typed CLI @var{command}.
+
+This command is intended for @sc{gdb/mi} frontends that cannot use two separate
+CLI and MI channels - for example: because of lack of PTYs like on Windows or
+because @value{GDBN} is used remotely via a SSH connection.
+
+@subheading Result
+
+The result consists of two or three fields:
+
+@table @samp
+@item completion
+This field contains the completed @var{command}.  If @var{command}
+has no known completions, this field is omitted.
+
+@item matches
+This field contains a (possibly empty) array of matches.  It is always present.
+
+@item max_completions_reached
+This field contains @code{1} if number of known completions is above
+@code{max-completions} limit (see @ref{Completion}), otherwise it contains
+@code{0}.  It is always present.
+
+@end table
+
+@subheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{complete}.
+
+@subheading Example
+
+@smallexample
+(gdb)
+-complete br
+^done,completion="break",
+      matches=["break","break-range"],
+      max_completions_reached="0"
+(gdb)
+-complete "b ma"
+^done,completion="b ma",
+      matches=["b madvise","b main"],max_completions_reached="0"
+(gdb)
+-complete "b push_b"
+^done,completion="b push_back(",
+      matches=[
+       "b A::push_back(void*)",
+       "b std::string::push_back(char)",
+       "b std::vector<int, std::allocator<int> >::push_back(int&&)"],
+      max_completions_reached="0"
+(gdb)
+-complete "nonexist"
+^done,matches=[],max_completions_reached="0"
+(gdb)
+
+@end smallexample
+
 @node Annotations
 @chapter @value{GDBN} Annotations
 

gdb/mi/mi-cmds.c

@@ -75,6 +75,7 @@ static struct mi_cmd mi_cmds[] =
                    &mi_suppress_notification.breakpoint),
   DEF_MI_CMD_MI_1 ("catch-unload", mi_cmd_catch_unload,
                    &mi_suppress_notification.breakpoint),
+  DEF_MI_CMD_MI ("complete", mi_cmd_complete),
   DEF_MI_CMD_MI ("data-disassemble", mi_cmd_disassemble),
   DEF_MI_CMD_MI ("data-evaluate-expression", mi_cmd_data_evaluate_expression),
   DEF_MI_CMD_MI ("data-list-changed-registers",

gdb/mi/mi-cmds.h

@@ -125,6 +125,7 @@ extern mi_cmd_argv_ftype mi_cmd_var_update;
 extern mi_cmd_argv_ftype mi_cmd_enable_pretty_printing;
 extern mi_cmd_argv_ftype mi_cmd_enable_frame_filters;
 extern mi_cmd_argv_ftype mi_cmd_var_set_update_range;
+extern mi_cmd_argv_ftype mi_cmd_complete;
 
 /* Description of a single command.  */
 

gdb/mi/mi-main.c

@@ -2708,6 +2708,51 @@ mi_cmd_fix_multi_location_breakpoint_output (const char *command, char **argv,
   fix_multi_location_breakpoint_output_globally = true;
 }
 
+/* Implement the "-complete" command.  */
+
+void
+mi_cmd_complete (const char *command, char **argv, int argc)
+{
+  if (argc != 1)
+    error (_("Usage: -complete COMMAND"));
+
+  if (max_completions == 0)
+    error (_("max-completions is zero, completion is disabled."));
+
+  int quote_char = '\0';
+  const char *word;
+
+  completion_result result = complete (argv[0], &word, &quote_char);
+
+  std::string arg_prefix (argv[0], word - argv[0]);
+
+  struct ui_out *uiout = current_uiout;
+
+  if (result.number_matches > 0)
+    uiout->field_fmt ("completion", "%s%s",
+                      arg_prefix.c_str (),result.match_list[0]);
+
+  {
+    ui_out_emit_list completions_emitter (uiout, "matches");
+
+    if (result.number_matches == 1)
+      uiout->field_fmt (NULL, "%s%s",
+                        arg_prefix.c_str (), result.match_list[0]);
+    else
+      {
+        result.sort_match_list ();
+        for (size_t i = 0; i < result.number_matches; i++)
+          {
+            uiout->field_fmt (NULL, "%s%s",
+                              arg_prefix.c_str (), result.match_list[i + 1]);
+          }
+      }
+  }
+  uiout->field_string ("max_completions_reached",
+                       result.number_matches == max_completions ? "1" : "0");
+}
+
+
 void
 _initialize_mi_main (void)
 {

gdb/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2019-01-28  Jan Vrany  <jan.vrany@fit.cvut.cz>
+
+	* gdb.mi/mi-complete.exp: New file.
+	* gdb.mi/mi-complete.cc: Likewise.
+
 2019-05-15  Bernhard Heckel  <bernhard.heckel@intel.com>
 
 	* gdb.fortran/vla-sizeof.exp: Add tests of sizeof applied to

gdb/testsuite/gdb.mi/mi-complete.cc

@@ -0,0 +1,40 @@
+/* Copyright 2018-2019 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <vector>
+
+class A
+{
+public:
+  void push_back (void *value);
+};
+
+void
+A::push_back (void *value)
+{
+  /* nothing */
+}
+
+int
+main (int argc, char **argv)
+{
+  std::vector < int >v;
+  v.push_back (1);
+  A a;
+  a.push_back (&v);
+  return 0;
+}

gdb/testsuite/gdb.mi/mi-complete.exp

@@ -0,0 +1,72 @@
+# Copyright 2018-2019 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Verify GDB/MI -complete in various scenarios. This test only tests
+# -complete command, not the correctness of completions.
+
+load_lib mi-support.exp
+set MIFLAGS "-i=mi"
+
+gdb_exit
+if [mi_gdb_start] {
+    continue
+}
+
+standard_testfile .cc
+
+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug c++}] != "" } {
+     untested "failed to compile"
+     return -1
+}
+
+mi_run_to_main
+
+mi_gdb_test "1-complete br" \
+            "1\\^done,completion=\"break\",matches=\\\[.*\"break\",.*\"break-range\".*\\\],max_completions_reached=\"0\"" \
+            "-complete br"
+
+# Check empty completion list.
+mi_gdb_test "5-complete bogus" \
+            "5\\^done,matches=\\\[\\\],max_completions_reached=\"0\"" \
+            "-complete bogus"
+
+# Check completions for commands with space.
+mi_gdb_test "4-complete \"b mai\"" \
+            "4\\^done,completion=\"b main\",matches=\\\[.*\"b main\".*\\\],max_completions_reached=\"0\"" \
+            "-complete \"b mai\""
+
+# Check wildmatching.
+mi_gdb_test "5-complete \"b push_ba\"" \
+            "5\\^done,completion=\"b push_back\\(\",matches=\\\[.*\"b A::push_back\\(void\\*\\)\".*\\\],max_completions_reached=\"0\"" \
+            "-complete \"b push_ba\", wildmatching"
+
+mi_gdb_test "-info-gdb-mi-command complete" \
+            "\\^done,command=\{exists=\"true\"\}" \
+            "-info-gdb-mi-command complete"
+
+# Limit max completions and check that max_completions_reached=\"0\" is set
+# to 1.
+send_gdb "set max-completions 1\n"
+
+mi_gdb_test "2-complete br" \
+            ".*2\\^done,completion=\"br\[A-Za-z0-9-\]+\",matches=\\\[\"br\[A-Za-z0-9-\]+\"\\\],max_completions_reached=\"1\"" \
+            "-complete br, max-completions 1"
+
+# Disable completions and check an error is returned
+send_gdb "set max-completions 0\n"
+
+mi_gdb_test "3-complete br" \
+            ".*3\\^error,msg=\".*" \
+            "-complete br, max-completions 0"