shell: implement version command

Makefile

@@ -12,6 +12,7 @@ all: $(BUILD)/tbm
 
 -include scripts/Makefile.${TARGET}
 
+CFLAGS += -DTBM_VERSION=\"2017-07-27-dev\"
 CFLAGS += -Iinclude
 CFLAGS += -Wall -Wundef -Wextra -Wshadow -Wimplicit-function-declaration
 CFLAGS += -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes -pedantic
@@ -47,6 +48,7 @@ obj-y += source/shell/flash.o
 obj-y += source/shell/ftl.o
 obj-y += source/shell/mufs.o
 obj-y += source/shell/rtc.o
+obj-y += source/shell/version.o
 
 obj = $(addprefix $(BUILD)/, $(obj-y))
 

include/shell/version.h

@@ -0,0 +1,3 @@
+#pragma once
+
+void shell_version(struct console *con, const char **argv, size_t argc);

source/shell/version.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+#include <console.h>
+
+#include <shell/version.h>
+
+void shell_version(struct console *con, const char **argv, size_t argc)
+{
+	(void)argv;
+
+	if (argc < 1)
+		return;
+
+	fprintf(con->fp, "hello,%s\n", TBM_VERSION);
+}