Function detect_patch 

pub fn detect_patch(content: &str) -> PatchFormat

Automatically detects the patch format of the provided content.

This function scans the content efficiently (without parsing the full structure) to determine if it contains Markdown code blocks, standard unified diff headers, or conflict markers.

Priority

1. Markdown: If code fences (3+ backticks) are found containing diff signatures, it is treated as Markdown.
2. Unified: If --- a/ or diff --git headers are found, it is treated as a Unified Diff.
3. Conflict: If <<<< markers are found, it is treated as Conflict Markers.

Example

use mpatch::{detect_patch, PatchFormat};

let md = "```diff\n--- a/f\n+++ b/f\n```";
assert_eq!(detect_patch(md), PatchFormat::Markdown);

let raw = "--- a/f\n+++ b/f\n@@ -1 +1 @@";
assert_eq!(detect_patch(raw), PatchFormat::Unified);