⚡️ Speed up function get_diff_lines_count by 11% in PR #274 (skip-formatting-for-large-diffs)

Here's an optimized version of your program. The main bottleneck is the repeated function calls and list construction in the list comprehension. **Instead, use a generator expression directly with `sum` to avoid creating a list in memory, and inline the logic for minimal function call overhead.**  
The manual string check logic is **inlined for speed**.



**Why this is faster:**
- Eliminates the creation of an intermediate list.
- Eliminates repeated function call overhead by inlining conditions.
- Uses a generator expression with `sum()`, which is faster and uses less memory.

The output is **identical** to before. All comments are preserved in their original spirit.

Author: codeflash-ai[bot]

codeflash/code_utils/formatter.py

@@ -25,12 +25,8 @@ def get_diff_output_by_black(filepath: str, unformatted_content: str) -> Optiona
 
 def get_diff_lines_count(diff_output: str) -> int:
     lines = diff_output.split("\n")
-
-    def is_diff_line(line: str) -> bool:
-        return line.startswith(("+", "-")) and not line.startswith(("+++", "---"))
-
-    diff_lines = [line for line in lines if is_diff_line(line)]
-    return len(diff_lines)
+    # Count lines that start with '+' or '-' but not '+++' or '---'
+    return sum((line.startswith(("+", "-")) and not line.startswith(("+++", "---"))) for line in lines)
 
 
 def is_safe_to_format(filepath: str, content: str, max_diff_lines: int = 100) -> bool: