shell: add a directory for backends

This change organizes the file structure for the shell.
Files implementing backends are moved to a separate folder.

Signed-off-by: Jakub Rzeszutko <jakub.rzeszutko@nordicsemi.no>

subsys/shell/CMakeLists.txt

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 add_subdirectory(modules)
+add_subdirectory(backends)
 
 zephyr_sources_ifdef(
   CONFIG_SHELL
@@ -11,23 +12,8 @@ zephyr_sources_ifdef(
   )
 
 zephyr_sources_ifdef(
-  CONFIG_SHELL_BACKEND_SERIAL
-  shell_uart.c
-)
-
-zephyr_sources_ifdef(
-  CONFIG_SHELL_BACKEND_DUMMY
-  shell_dummy.c
-)
-
-zephyr_sources_ifdef(
-  CONFIG_SHELL_BACKEND_RTT
-  shell_rtt.c
-)
-
-zephyr_sources_ifdef(
-  CONFIG_SHELL_BACKEND_TELNET
-  shell_telnet.c
+  CONFIG_SHELL_LOG_BACKEND
+  shell_log_backend.c
   )
 
 zephyr_sources_ifdef(
@@ -50,11 +36,6 @@ zephyr_sources_ifdef(
   shell_history.c
   )
 
-zephyr_sources_ifdef(
-  CONFIG_SHELL_LOG_BACKEND
-  shell_log_backend.c
-)
-
 zephyr_sources_ifdef(
   CONFIG_SHELL_WILDCARD
   shell_wildcard.c

subsys/shell/Kconfig

@@ -15,7 +15,7 @@ if SHELL
 module = SHELL
 module-str = Shell
 source "subsys/logging/Kconfig.template.log_config"
-source "subsys/shell/Kconfig.backends"
+source "subsys/shell/backends/Kconfig.backends"
 
 config SHELL_MINIMAL
 	bool "Default config to reduce flash and memory requirements"

subsys/shell/backends/CMakeLists.txt

@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_sources_ifdef(
+  CONFIG_SHELL_BACKEND_SERIAL
+  shell_uart.c
+)
+
+zephyr_sources_ifdef(
+  CONFIG_SHELL_BACKEND_DUMMY
+  shell_dummy.c
+)
+
+zephyr_sources_ifdef(
+  CONFIG_SHELL_BACKEND_RTT
+  shell_rtt.c
+)
+
+zephyr_sources_ifdef(
+  CONFIG_SHELL_BACKEND_TELNET
+  shell_telnet.c
+)