From 6c7382be0580be7b13baa4e17381e0a1a6f0a635 Mon Sep 17 00:00:00 2001
From: agata <toshitaka.agata@gmail.com>
Date: Wed, 15 Oct 2025 23:08:33 +0900
Subject: [PATCH] Remove diff logging dependency

---
 Cargo.lock              |  7 -------
 Cargo.toml              |  1 -
 src/core/postprocess.rs | 39 ++++-----------------------------------
 3 files changed, 4 insertions(+), 43 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 3254efb..b901bb1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2073,7 +2073,6 @@ dependencies = [
  "serde_json",
  "serde_yaml",
  "signal-hook",
- "similar",
  "sys-locale",
  "toml",
  "tracing",
@@ -4083,12 +4082,6 @@ version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d66dc143e6b11c1eddc06d5c423cfc97062865baf299914ab64caa38182078fe"
 
-[[package]]
-name = "similar"
-version = "2.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bbbb5d9659141646ae647b42fe094daf6c6192d1620870b449d9557f748b2daa"
-
 [[package]]
 name = "slab"
 version = "0.4.11"
diff --git a/Cargo.toml b/Cargo.toml
index c8d4853..f23f928 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -42,7 +42,6 @@ serde_json = "1.0"
 toml = "0.8"
 serde_yaml = "0.9"
 image = { version = "0.24", default-features = false, features = ["png", "jpeg"] }
-similar = "2.6"
 
 # GUI
 egui = "0.32"
diff --git a/src/core/postprocess.rs b/src/core/postprocess.rs
index a3d862f..5686142 100644
--- a/src/core/postprocess.rs
+++ b/src/core/postprocess.rs
@@ -3,7 +3,6 @@ use crate::llm::{
     history_file_path, record_history, LlmPostProcessSettings, LlmPostProcessor,
     MAX_HISTORY_ENTRIES,
 };
-use similar::{ChangeTag, TextDiff};
 use std::sync::{Arc, Mutex};
 
 pub struct PostProcessResult {
@@ -66,7 +65,7 @@ impl PostProcessEngine {
 
         let mut final_text = base_text.to_string();
         let mut llm_latency_secs = 0.0f32;
-        let mut llm_output_for_diff: Option<String> = None;
+        let mut llm_output_for_log: Option<String> = None;
 
         let mut history_payload: Option<(String, bool, u128)> = None;
         match self
@@ -93,7 +92,7 @@ impl PostProcessEngine {
                     &format!("[llm] Completed in {:.2}s.", llm_latency_secs),
                 );
                 log_message(log, &format!("[llm][output] {}", content));
-                llm_output_for_diff = Some(content.clone());
+                llm_output_for_log = Some(content.clone());
                 if snapshot.apply_to_autopaste {
                     final_text = content.clone();
                 } else {
@@ -144,41 +143,11 @@ impl PostProcessEngine {
             }
         }
 
-        if let Some(output_text) = llm_output_for_diff.as_ref() {
+        if let Some(output_text) = llm_output_for_log.as_ref() {
             if output_text == base_text {
                 log_message(log, "[llm] Output identical to Whisper text.");
             } else {
-                let diff = TextDiff::from_lines(base_text, output_text);
-                let mut diff_lines = Vec::new();
-                let mut truncated = false;
-                for change in diff.iter_all_changes() {
-                    let prefix = match change.tag() {
-                        ChangeTag::Delete => "-",
-                        ChangeTag::Insert => "+",
-                        ChangeTag::Equal => continue,
-                    };
-                    if diff_lines.len() >= 120 {
-                        truncated = true;
-                        break;
-                    }
-                    let mut line = change.value().trim_end_matches('\n').to_string();
-                    if line.chars().count() > 200 {
-                        let mut truncated = String::with_capacity(201);
-                        truncated.extend(line.chars().take(200));
-                        truncated.push_str("…");
-                        line = truncated;
-                    }
-                    diff_lines.push(format!("{}{}", prefix, line));
-                }
-
-                if diff_lines.is_empty() {
-                    log_message(log, "[llm] Output identical to Whisper text.");
-                } else {
-                    if truncated {
-                        diff_lines.push("... (diff truncated)".to_string());
-                    }
-                    log_message(log, &format!("[llm][diff]\n{}", diff_lines.join("\n")));
-                }
+                log_message(log, "[llm] Output differs from Whisper text.");
             }
         }