shell: Add shell command command rem (#151)

Added the shell comment command

Signed-off-by: Jared Baumann <jared.baumann8@t-mobile.com>

Author: jtbaumann

.gitattributes

@@ -209,6 +209,7 @@ subsys/net/lib/ping/Kconfig merge=ours
 subsys/net/lib/ping/ping.c merge=ours
 subsys/shell/modules/date_service.c merge=ours
 subsys/shell/shell_help.c merge=ours
+subsys/shell/shell_cmds.c merge=ours
 subsys/shell/shell_ops.c merge=ours
 tests/drivers/counter/counter_basic_api/boards/efm32pg_stk3402a.conf merge=ours
 tests/drivers/counter/counter_basic_api/boards/tmo_dev_edge.conf merge=ours

subsys/shell/shell_cmds.c

@@ -10,6 +10,7 @@
 #include "shell_vt100.h"
 
 #define SHELL_MSG_CMD_NOT_SUPPORTED	"Command not supported.\n"
+#define SHELL_HELP_COMMENT		"Ignore lines beginning with 'rem '"
 #define SHELL_HELP_CLEAR		"Clear screen."
 #define SHELL_HELP_BACKENDS		"List active shell backends.\n"
 #define SHELL_HELP_BACKSPACE_MODE	"Toggle backspace key mode.\n"	      \
@@ -196,6 +197,15 @@ static int terminal_size_get(const struct shell *shell)
 	return ret_val;
 }
 
+static int cmd_comment(const struct shell *sh, size_t argc, char **argv)
+{
+	ARG_UNUSED(sh);
+	ARG_UNUSED(argc);
+	ARG_UNUSED(argv);
+
+	return 0;
+}
+
 static int cmd_clear(const struct shell *shell, size_t argc, char **argv)
 {
 	ARG_UNUSED(argv);
@@ -488,6 +498,8 @@ SHELL_STATIC_SUBCMD_SET_CREATE(m_sub_resize,
 	SHELL_SUBCMD_SET_END
 );
 
+SHELL_COND_CMD_REGISTER(CONFIG_SHELL_VT100_COMMANDS, rem, NULL,
+				SHELL_HELP_COMMENT, cmd_comment);
 SHELL_COND_CMD_ARG_REGISTER(CONFIG_SHELL_VT100_COMMANDS, clear, NULL,
 			    SHELL_HELP_CLEAR, cmd_clear, 1, 0);
 SHELL_CMD_REGISTER(shell, &m_sub_shell, SHELL_HELP_SHELL, NULL);