Add displayed_registers setting to allow showing of specific registers (#53)

Author: stephen-f0

README.md

@@ -73,6 +73,7 @@ Settings are stored in a file `.llef` located in your home directory formatted a
 | rebase_addresses        | Boolean | Enable/disable address rebase output               |
 | rebase_offset           | Int     | Set the rebase offset (default 0x100000)           |
 | show_all_registers      | Boolean | Enable/disable extended register output            |
+| displayed_registers     | List    | Comma separated list of registers to display. Order is preserved. Use `default` as a placeholder for the built-in registers. e.g. `llefsettings set displayed_registers default,ymm0,ymm1` |
 | enable_darwin_heap_scan | Boolean | Enable/disable more accurate heap scanning for Darwin-based platforms. Uses the Darwin malloc introspection API, executing code in the address space of the target application using LLDB's evaluation engine |
 | max_trace_length        | Int     | Set the maximum length of the call stack backtrace to display                                        |
 | stack_view_size         | Int     | Set the number of entries in the stack read to display                                               |

common/context_handler.py

@@ -310,6 +310,11 @@ def display_registers(self) -> None:
             for reg in self.arch().flag_registers:
                 if reg.name in register_list:
                     register_list.remove(reg.name)
+        elif self.settings.displayed_registers is not None:
+            register_list = self.settings.displayed_registers
+            if "default" in register_list:
+                default_id = register_list.index("default")
+                register_list = register_list[:default_id] + self.arch().gpr_registers + register_list[default_id + 1 :]
         else:
             register_list = self.arch().gpr_registers
 

common/settings.py

@@ -1,7 +1,7 @@
 """Global settings module"""
 
 import os
-from typing import Union
+from typing import List, Union
 
 from lldb import SBDebugger
 
@@ -74,6 +74,11 @@ def rebase_offset(self) -> int:
     def show_all_registers(self) -> bool:
         return self._RAW_CONFIG.getboolean(self.GLOBAL_SECTION, "show_all_registers", fallback=False)
 
+    @property
+    def displayed_registers(self) -> List[str]:
+        displayed_str = self._RAW_CONFIG.get(self.GLOBAL_SECTION, "displayed_registers", fallback=None)
+        return displayed_str.split(",") if displayed_str is not None else None
+
     @property
     def output_order(self) -> str:
         return self._RAW_CONFIG.get(self.GLOBAL_SECTION, "output_order", fallback=self.DEFAUL_OUTPUT_ORDER)