PR cli/21688: Detect aliases when issuing python/compile/guile commands (and fix last commit)

My last commit fixed a regression that happened when using
inline/multi-line commands for Python/Compile/Guile, but introduced
another regression: it is now not possible to use aliases for the
commands mentioned above.  The fix is to almost revert the change I've
made and go back to using the 'struct cmd_list_element *', but at the
same time make sure that we advance the 'cmd_name' variable past all
the whitespace characters after the command name.  If, after skipping
the whitespace, we encounter a '\0', it means that the command is not
inline.  Otherwise, it is.

This patch also expands the testcase in order to check for aliases and
for trailing whitespace after the command name.

gdb/ChangeLog:
2017-06-30  Sergio Durigan Junior  <sergiodj@redhat.com>
	    Pedro Alves  <palves@redhat.com>

	PR cli/21688
	* cli/cli-script.c (command_name_equals_not_inline): Remove function.
	(process_next_line): New variable 'inline_cmd'.
	Adjust 'if' clauses for "python", "compile" and "guile" to use
	'command_name_equals' and check for '!inline_cmd'.

gdb/testsuite/ChangeLog:
2017-06-30  Sergio Durigan Junior  <sergiodj@redhat.com>

	PR cli/21688
	* gdb.python/py-cmd.exp (test_python_inline_or_multiline): Add new
	tests for alias commands and trailing whitespace.

1 files changed, 5 insertions, 17 deletions

diff --git a/gdb/cli/cli-script.c b/gdb/cli/cli-script.c
index 72f316f..5674404 100644
--- a/gdb/cli/cli-script.c
+++ b/gdb/cli/cli-script.c
@@ -900,20 +900,6 @@ command_name_equals (struct cmd_list_element *cmd, const char *name)
 	  && strcmp (cmd->name, name) == 0);
 }
 
-/* Return true if NAME is the only command between COMMAND_START and
-   COMMAND_END.  This is useful when we want to know whether the
-   command is inline (i.e., has arguments like 'python command1') or
-   is the start of a multi-line command block.  */
-
-static bool
-command_name_equals_not_inline (const char *command_start,
-				const char *command_end,
-				const char *name)
-{
-  return (command_end - command_start == strlen (name)
-	  && startswith (command_start, name));
-}
-
 /* Given an input line P, skip the command and return a pointer to the
    first argument.  */
 
@@ -966,6 +952,8 @@ process_next_line (char *p, struct command_line **command, int parse_commands,
       const char *cmd_name = p;
       struct cmd_list_element *cmd
 	= lookup_cmd_1 (&cmd_name, cmdlist, NULL, 1);
+      cmd_name = skip_spaces_const (cmd_name);
+      bool inline_cmd = *cmd_name != '\0';
 
       /* If commands are parsed, we skip initial spaces.  Otherwise,
 	 which is the case for Python commands and documentation
@@ -1011,20 +999,20 @@ process_next_line (char *p, struct command_line **command, int parse_commands,
 	{
 	  *command = build_command_line (commands_control, line_first_arg (p));
 	}
-      else if (command_name_equals_not_inline (p_start, p_end, "python"))
+      else if (command_name_equals (cmd, "python") && !inline_cmd)
 	{
 	  /* Note that we ignore the inline "python command" form
 	     here.  */
 	  *command = build_command_line (python_control, "");
 	}
-      else if (command_name_equals_not_inline (p_start, p_end, "compile"))
+      else if (command_name_equals (cmd, "compile") && !inline_cmd)
 	{
 	  /* Note that we ignore the inline "compile command" form
 	     here.  */
 	  *command = build_command_line (compile_control, "");
 	  (*command)->control_u.compile.scope = COMPILE_I_INVALID_SCOPE;
 	}
-      else if (command_name_equals_not_inline (p_start, p_end, "guile"))
+      else if (command_name_equals (cmd, "guile") && !inline_cmd)
 	{
 	  /* Note that we ignore the inline "guile command" form here.  */
 	  *command = build_command_line (guile_control, "");