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feat: add inline diff previews for write actions

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Show inline diffs in the CLI transcript when write_file, patch, or
skill_manage modifies files. Captures a filesystem snapshot before the
tool runs, computes a unified diff after, and renders it with ANSI
coloring in the activity feed.

Adds tool_start_callback and tool_complete_callback hooks to AIAgent
for pre/post tool execution notifications.

Also fixes _extract_parallel_scope_path to normalize relative paths
to absolute, preventing the parallel overlap detection from missing
conflicts when the same file is referenced with different path styles.

Gated by display.inline_diffs config option (default: true).

Based on PR #3774 by @kshitijk4poor.
This commit is contained in:
kshitijk4poor 2026-04-01 01:50:11 -07:00 • committed by Teknium
parent 68fc4aec21
commit 935137f0d9
6 changed files with 569 additions and 4 deletions
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33
cli.py
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@ -1077,12 +1077,16 @@ class HermesCLI:
# streaming: stream tokens to the terminal as they arrive (display.streaming in config.yaml)
self.streaming_enabled = CLI_CONFIG["display"].get("streaming", False)
# Inline diff previews for write actions (display.inline_diffs in config.yaml)
self._inline_diffs_enabled = CLI_CONFIG["display"].get("inline_diffs", True)
# Streaming display state
self._stream_buf = "" # Partial line buffer for line-buffered rendering
self._stream_started = False # True once first delta arrives
self._stream_box_opened = False # True once the response box header is printed
self._reasoning_stream_started = False # True once live reasoning starts streaming
self._reasoning_preview_buf = "" # Coalesce tiny reasoning chunks for [thinking] output
self._pending_edit_snapshots = {}
# Configuration - priority: CLI args > env vars > config file
# Model comes from: CLI arg or config.yaml (single source of truth).
@ -2132,6 +2136,8 @@ class HermesCLI:
checkpoint_max_snapshots=self.checkpoint_max_snapshots,
pass_session_id=self.pass_session_id,
tool_progress_callback=self._on_tool_progress,
tool_start_callback=self._on_tool_start if self._inline_diffs_enabled else None,
tool_complete_callback=self._on_tool_complete if self._inline_diffs_enabled else None,
stream_delta_callback=self._stream_delta if self.streaming_enabled else None,
tool_gen_callback=self._on_tool_gen_start if self.streaming_enabled else None,
)
@ -5034,6 +5040,33 @@ class HermesCLI:
except Exception:
pass
def _on_tool_start(self, tool_call_id: str, function_name: str, function_args: dict):
"""Capture local before-state for write-capable tools."""
try:
from agent.display import capture_local_edit_snapshot
snapshot = capture_local_edit_snapshot(function_name, function_args)
if snapshot is not None:
self._pending_edit_snapshots[tool_call_id] = snapshot
except Exception:
logger.debug("Edit snapshot capture failed for %s", function_name, exc_info=True)
def _on_tool_complete(self, tool_call_id: str, function_name: str, function_args: dict, function_result: str):
"""Render file edits with inline diff after write-capable tools complete."""
snapshot = self._pending_edit_snapshots.pop(tool_call_id, None)
try:
from agent.display import render_edit_diff_with_delta
render_edit_diff_with_delta(
function_name,
function_result,
function_args=function_args,
snapshot=snapshot,
print_fn=_cprint,
)
except Exception:
logger.debug("Edit diff preview failed for %s", function_name, exc_info=True)
# ====================================================================
# Voice mode methods
# ====================================================================