Fzf reverse history search

aider/args.py

@@ -849,6 +849,10 @@ def get_parser(default_config_files, git_root):
         "--editor",
         help="Specify which editor to use for the /editor command",
     )
+    group.add_argument(
+        "--fzf-history-search",
+        help="Use fuzzy find (fzf) for backwards history search",
+    )
 
     supported_shells_list = sorted(list(shtab.SUPPORTED_SHELLS))
     group.add_argument(

aider/io.py

@@ -263,6 +263,7 @@ def __init__(
         root=".",
         notifications=False,
         notifications_command=None,
+        fzf_history_search=False,
     ):
         self.placeholder = None
         self.interrupted = False
@@ -371,6 +372,8 @@ def __init__(
         # Validate color settings after console is initialized
         self._validate_color_settings()
 
+        self.fzf_history_search = fzf_history_search
+
     def _validate_color_settings(self):
         """Validate configured color strings and reset invalid ones."""
         color_attributes = [
@@ -594,6 +597,43 @@ def _(event):
             "Navigate forward through history"
             event.current_buffer.history_forward()
 
+        if self.fzf_history_search:
+            @kb.add("c-r")
+            def _(event):
+                if not self.input_history_file:
+                    self.tool_error("Reverse search attempt without history file")
+
+                    event.app.reset()
+
+                    return
+
+                history_lines = "\n".join(
+                    FileHistory(self.input_history_file).load_history_strings()
+                )
+
+                fzf_result = (
+                    subprocess.run(
+                        ["fzf", "--reverse", "--height", "20"],
+                        check=False,
+                        capture_output=True,
+                        text=True,
+                        input=history_lines,
+                    )
+                )
+                if fzf_result.returncode != 0:
+                    self.tool_error(f"fzf returned error: {fzf_result.stderr}")
+
+                    event.app.reset()
+
+                    return
+
+                fzf_output = fzf_result.stdout.rstrip("\n")
+
+                event.app.reset()
+                buffer = event.current_buffer
+                buffer.text = fzf_output
+                buffer.cursor_position = len(buffer.text)
+
         @kb.add("c-x", "c-e")
         def _(event):
             "Edit current input in external editor (like Bash)"

aider/main.py

@@ -575,6 +575,7 @@ def get_io(pretty):
             multiline_mode=args.multiline,
             notifications=args.notifications,
             notifications_command=args.notifications_command,
+            fzf_history_search=args.fzf_history_search,
         )
 
     io = get_io(args.pretty)