Function render_file_block 

pub fn render_file_block(file: &FileDiff, color: bool) -> RenderedFile

Renders a single file diff into formatted output lines.

Transforms file diff data into visual representation with colors, separators, and grouped imports. Pre-calculates visual width for grid layout optimization.

Structure

File: path/to/file.rs           <- Header (cyan + bold)
────────────────────────────    <- Separator
Imports (file top)              <- Import section header
+    use std::fs::write;        <- Grouped imports (green)

analyzer_name (N issues)        <- Analyzer section (green + bold)

Line 42                         <- Line number (cyan)
-    old code                   <- Removal (red)
+    new code                   <- Addition (green)

════════════════════════════    <- End separator

Arguments

• file - File diff containing all changes

Returns

RenderedFile with formatted lines and calculated width

Performance

• Pre-allocates Vec with estimated capacity
• Groups and deduplicates imports once
• Calculates width incrementally (single pass)
• Minimizes string allocations

Examples

use cargo_quality::differ::{display::render::render_file_block, types::FileDiff};

let file_diff = FileDiff::new("test.rs".to_string());
let rendered = render_file_block(&file_diff, false);

assert!(!rendered.lines.is_empty());
assert!(rendered.width >= 40);