Allow . character as part of command names.

This patch adds . as an allowed character for user defined commands.
Combined with 'define-prefix', this allows to e.g. define a set of Valgrind
specific user command corresponding to the Valgrind monitor commands
(such as check_memory, v.info, v.set, ...).

gdb/ChangeLog
2019-11-30  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

	* command.h (valid_cmd_char_p): Declare.
	* cli/cli-decode.c (valid_cmd_char_p): New function factorizing
	the check of valid command char.
	(find_command_name_length, valid_user_defined_cmd_name_p): Use
	valid_cmd_char_p.
	* cli/cli-script.c (validate_comname): Likewise.
	* completer.c (gdb_completer_command_word_break_characters):
	Do not remove . from the word break char, update comments.
	(complete_line_internal_1): Use valid_cmd_char_p.
	* guile/scm-cmd.c (gdbscm_parse_command_name): Likewise.
	* python/py-cmd.c (gdbpy_parse_command_name): Likewise.

gdb/testsuite/ChangeLog
2019-11-30  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

	* gdb.base/define.exp: Test . in command names.
	* gdb.base/setshow.exp: Update test, as . is now part of
	command name.

3 files changed, 32 insertions, 1 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index a88c545..1f52d01 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,5 +1,11 @@
 2019-11-30  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
 
+	* gdb.base/define.exp: Test . in command names.
+	* gdb.base/setshow.exp: Update test, as . is now part of
+	command name.
+
+2019-11-30  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
+
 	* gdb.base/define-prefix.exp: New file.
 
 2019-11-28  Andrew Burgess  <andrew.burgess@embecosm.com>
diff --git a/gdb/testsuite/gdb.base/define.exp b/gdb/testsuite/gdb.base/define.exp
index d7d4fd0..b5183ec 100644
--- a/gdb/testsuite/gdb.base/define.exp
+++ b/gdb/testsuite/gdb.base/define.exp
@@ -130,6 +130,31 @@ gdb_test "help nextwhere" \
     "   A next command that first shows you where you're stepping from.*" \
     "preserve whitespace in help string"
 
+# Verify that GDB allows a user to use . in a command name.
+#
+gdb_test_multiple "define dot.command" "define user command: dot.command" {
+    -re "Type commands for definition of \"dot.command\".\r\nEnd with a line saying just \"end\".\r\n>$" {
+	gdb_test "echo dot command\\n\nend" "" \
+	    "define user command: dot.command"
+    }
+}
+
+# Verify that dot.command works.
+#
+gdb_test "dot.command" \
+    "dot command" \
+    "full name dot.command"
+gdb_test "dot" \
+    "dot command" \
+    "partial name dot"
+gdb_test "dot." \
+    "dot command" \
+    "partial name dot."
+gdb_test "dot.c" \
+    "dot command" \
+    "partial name dot.c"
+
+
 # Verify that the command parser doesn't require a space after an 'if'
 # command in a user defined function.
 #
diff --git a/gdb/testsuite/gdb.base/setshow.exp b/gdb/testsuite/gdb.base/setshow.exp
index 717bcc3..394967b 100644
--- a/gdb/testsuite/gdb.base/setshow.exp
+++ b/gdb/testsuite/gdb.base/setshow.exp
@@ -355,7 +355,7 @@ gdb_test_no_output "set verbose off" "set verbose off"
 gdb_test "show verbose" "Verbosity is off..*" "show verbose (off)" 
 #test argument must be preceded by space
 foreach x {"history file" "solib-search-path" "data-directory"} {
-    foreach y {"/home/" "." "~/home" "=home"} {
+    foreach y {"/home/" "~/home" "=home"} {
         gdb_test "set $x$y" "Argument must be preceded by space." \
             "$x is not set to $y"
     }