diff --git a/aider/args.py b/aider/args.py
index a528c78d0..a6d5bbe6a 100644
--- a/aider/args.py
+++ b/aider/args.py
@@ -313,7 +313,7 @@ def get_parser(default_config_files, git_root):
     group.add_argument(
         "--lint",
         action="store_true",
-        help="Run the linter on all dirty files, fix problems and commit",
+        help="Lint and fix provided files, or dirty files if none provided",
         default=False,
     )
     group.add_argument(
diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index 1fdf3eacf..a61c8e54d 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -84,10 +84,19 @@ class Coder:
         )
 
         if not main_model:
-            main_model = models.Model(models.DEFAULT_MODEL_NAME)
+            if from_coder:
+                main_model = from_coder.main_model
+            else:
+                main_model = models.Model(models.DEFAULT_MODEL_NAME)
 
         if edit_format is None:
-            edit_format = main_model.edit_format
+            if from_coder:
+                edit_format = from_coder.edit_format
+            else:
+                edit_format = main_model.edit_format
+
+        if not io and from_coder:
+            io = from_coder.io
 
         if from_coder:
             use_kwargs = dict(from_coder.original_kwargs)  # copy orig kwargs
@@ -127,6 +136,9 @@ class Coder:
 
         return res
 
+    def clone(self, **kwargs):
+        return Coder.create(from_coder=self, **kwargs)
+
     def get_announcements(self):
         lines = []
         lines.append(f"Aider v{__version__}")
diff --git a/aider/commands.py b/aider/commands.py
index ba72dc633..7641bebf5 100644
--- a/aider/commands.py
+++ b/aider/commands.py
@@ -153,40 +153,51 @@ class Commands:
         commit_message = args.strip()
         self.coder.repo.commit(message=commit_message)
 
-    def cmd_lint(self, args):
-        "Commit, run the linter on all dirty files, fix problems and commit again"
+    def cmd_lint(self, args="", fnames=None):
+        "Lint and fix provided files or in-chat files if none provided"
 
         if not self.coder.repo:
             self.io.tool_error("No git repository found.")
             return
 
-        if not self.coder.repo.is_dirty():
-            self.io.tool_error("No more changes to commit.")
-            return
+        if not fnames:
+            fnames = self.coder.get_inchat_relative_files()
 
-        fnames = self.coder.repo.get_dirty_files()
-        linted = False
+            if not fnames:
+                self.io.tool_error("No dirty files to lint.")
+                return
+
+        lint_coder = None
         for fname in fnames:
             try:
-                errors = self.coder.linter.lint(fname, cmd=args)
-                linted = True
+                errors = self.coder.linter.lint(fname)
             except FileNotFoundError as err:
                 self.io.tool_error(f"Unable to lint {fname}")
                 self.io.tool_error(str(err))
                 continue
 
-            if errors:
-                # Commit everything before we start fixing lint errors
-                if self.coder.repo.is_dirty():
-                    self.cmd_commit("")
+            if not errors:
+                continue
 
-                self.io.tool_error(errors)
+            # Commit everything before we start fixing lint errors
+            if self.coder.repo.is_dirty():
+                self.cmd_commit("")
 
-                abs_file_path = self.coder.abs_root_path(fname)
-                self.coder.abs_fnames.add(abs_file_path)
-                self.coder.run(errors)
+            self.io.tool_error(errors)
 
-        if linted and self.coder.repo.is_dirty():
+            if not lint_coder:
+                lint_coder = self.coder.clone(
+                    # Clear the chat history, fnames
+                    cur_messages=[],
+                    done_messages=[],
+                    fnames=None,
+                )
+
+            lint_coder.add_rel_fname(fname)
+            lint_coder.run(errors)
+            lint_coder.abs_fnames = set()
+
+        if lint_coder and self.coder.repo.is_dirty():
             self.cmd_commit("")
 
     def cmd_clear(self, args):
diff --git a/aider/io.py b/aider/io.py
index 3d0f79f2c..92462f1dd 100644
--- a/aider/io.py
+++ b/aider/io.py
@@ -325,7 +325,7 @@ class InputOutput:
 
         return res
 
-    def tool_error(self, message, strip=True):
+    def tool_error(self, message="", strip=True):
         self.num_error_outputs += 1
 
         if message.strip():
diff --git a/aider/linter.py b/aider/linter.py
index 4ca1ee17d..f2afe2d05 100644
--- a/aider/linter.py
+++ b/aider/linter.py
@@ -1,4 +1,5 @@
 import os
+import re
 import subprocess
 import sys
 import traceback
@@ -13,7 +14,6 @@ from tree_sitter_languages import get_parser  # noqa: E402
 warnings.simplefilter("ignore", category=FutureWarning)
 
 
-
 class Linter:
     def __init__(self, encoding="utf-8", root=None):
         self.encoding = encoding
@@ -22,9 +22,14 @@ class Linter:
         self.languages = dict(
             python=self.py_lint,
         )
+        self.all_lint_cmd = None
 
     def set_linter(self, lang, cmd):
-        self.languages[lang] = cmd
+        if lang:
+            self.languages[lang] = cmd
+            return
+
+        self.all_lint_cmd = cmd
 
     def get_rel_fname(self, fname):
         if self.root:
@@ -66,7 +71,10 @@ class Linter:
             lang = filename_to_lang(fname)
             if not lang:
                 return
-            cmd = self.languages.get(lang)
+            if self.all_lint_cmd:
+                cmd = self.all_lint_cmd
+            else:
+                cmd = self.languages.get(lang)
 
         if callable(cmd):
             linkres = cmd(fname, rel_fname, code)
@@ -86,7 +94,6 @@ class Linter:
         return res
 
     def py_lint(self, fname, rel_fname, code):
-        result = ""
         basic_res = basic_lint(rel_fname, code)
         compile_res = lint_python_compile(fname, code)
 
@@ -198,12 +205,9 @@ def traverse_tree(node):
     return errors
 
 
-import re
-
-
 def find_filenames_and_linenums(text, fnames):
     """
-    Search text for all occurrences of <filename>:\d+ and make a list of them
+    Search text for all occurrences of <filename>:\\d+ and make a list of them
     where <filename> is one of the filenames in the list `fnames`.
     """
     pattern = re.compile(r"(\b(?:" + "|".join(re.escape(fname) for fname in fnames) + r"):\d+\b)")
diff --git a/aider/main.py b/aider/main.py
index ad4c55c3d..9cf0dda10 100644
--- a/aider/main.py
+++ b/aider/main.py
@@ -1,5 +1,6 @@
 import configparser
 import os
+import re
 import sys
 from pathlib import Path
 
@@ -181,14 +182,18 @@ def parse_lint_cmds(lint_cmds, io):
     err = False
     res = dict()
     for lint_cmd in lint_cmds:
-        pieces = lint_cmd.split(":")
-        lang = pieces[0]
-        cmd = lint_cmd[len(lang) + 1 :]
+        if re.match(r"^[a-z]+:.*", lint_cmd):
+            pieces = lint_cmd.split(":")
+            lang = pieces[0]
+            cmd = lint_cmd[len(lang) + 1 :]
+            lang = lang.strip()
+        else:
+            lang = None
+            cmd = lint_cmd
 
-        lang = lang.strip()
         cmd = cmd.strip()
 
-        if lang and cmd:
+        if cmd:
             res[lang] = cmd
         else:
             io.tool_error(f'Unable to parse --lint-cmd "{lint_cmd}"')
@@ -383,11 +388,11 @@ def main(argv=None, input=None, output=None, force_git_root=None, return_coder=F
         return
 
     if args.commit:
-        coder.commands.cmd_commit("")
+        coder.commands.cmd_commit()
         return
 
     if args.lint:
-        coder.commands.cmd_lint("")
+        coder.commands.cmd_lint(fnames=fnames)
         return
 
     if args.test:
diff --git a/dev-requirements.txt b/dev-requirements.txt
index fcbb97d26..1b97b4d8d 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -105,7 +105,7 @@ pyproject-hooks==1.1.0
     # via
     #   build
     #   pip-tools
-pytest==8.2.0
+pytest==8.2.1
     # via -r dev-requirements.in
 python-dateutil==2.9.0.post0
     # via
@@ -115,7 +115,7 @@ pytz==2024.1
     # via pandas
 pyyaml==6.0.1
     # via pre-commit
-requests==2.31.0
+requests==2.32.0
     # via sphinx
 rich==13.7.1
     # via typer
diff --git a/requirements.txt b/requirements.txt
index 90a340ccb..b5d0731f4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -96,7 +96,7 @@ googleapis-common-protos==1.63.0
     #   grpcio-status
 greenlet==3.0.3
     # via playwright
-grep-ast==0.3.1
+grep-ast==0.3.2
     # via -r requirements.in
 grpcio==1.63.0
     # via