app.cmake: Replace tabs with spaces

The coding standards of Mbed OS require indentation of four spaces.

Author: LDong-Arm

tools/cmake/app.cmake

@@ -34,27 +34,27 @@ include(CheckPythonPackage)
 # Check python packages from requirements.txt
 file(STRINGS ${CMAKE_CURRENT_LIST_DIR}/requirements.txt PYTHON_REQUIREMENTS)
 foreach(REQUIREMENT ${PYTHON_REQUIREMENTS})
-	# Look for a string from the start of each line that does not contain "<", ">", "=", or " ".
-	if(REQUIREMENT MATCHES "^([^<>= ]+)")
-		set(PACKAGE_NAME ${CMAKE_MATCH_1})
-		string(TOUPPER ${PACKAGE_NAME} PACKAGE_NAME_UCASE) # Ucase name needed for CMake variable
-		string(TOLOWER ${PACKAGE_NAME} PACKAGE_NAME_LCASE) # Lcase name needed for import statement
-
-		check_python_package(${PACKAGE_NAME_LCASE} HAVE_PYTHON_${PACKAGE_NAME_UCASE})
-		if(NOT HAVE_PYTHON_${PACKAGE_NAME_UCASE})
-			message(WARNING "Missing Python dependency ${PACKAGE_NAME}")
-		endif()
-	else()
-		message(FATAL_ERROR "Cannot parse line \"${REQUIREMENT}\" in requirements.txt")
-	endif()
+    # Look for a string from the start of each line that does not contain "<", ">", "=", or " ".
+    if(REQUIREMENT MATCHES "^([^<>= ]+)")
+        set(PACKAGE_NAME ${CMAKE_MATCH_1})
+        string(TOUPPER ${PACKAGE_NAME} PACKAGE_NAME_UCASE) # Ucase name needed for CMake variable
+        string(TOLOWER ${PACKAGE_NAME} PACKAGE_NAME_LCASE) # Lcase name needed for import statement
+
+        check_python_package(${PACKAGE_NAME_LCASE} HAVE_PYTHON_${PACKAGE_NAME_UCASE})
+        if(NOT HAVE_PYTHON_${PACKAGE_NAME_UCASE})
+            message(WARNING "Missing Python dependency ${PACKAGE_NAME}")
+        endif()
+    else()
+        message(FATAL_ERROR "Cannot parse line \"${REQUIREMENT}\" in requirements.txt")
+    endif()
 
 endforeach()
 
 # Check deps for memap
 if(Python3_FOUND AND HAVE_PYTHON_INTELHEX AND HAVE_PYTHON_PRETTYTABLE)
-	set(HAVE_MEMAP_DEPS TRUE)
+    set(HAVE_MEMAP_DEPS TRUE)
 else()
-	set(HAVE_MEMAP_DEPS FALSE)
-	message(STATUS "Missing Python dependencies (python3, intelhex, prettytable) so the memory map cannot be printed")
+    set(HAVE_MEMAP_DEPS FALSE)
+    message(STATUS "Missing Python dependencies (python3, intelhex, prettytable) so the memory map cannot be printed")
 endif()