Small update

posts/hello-world-2.md

@@ -4,7 +4,7 @@ Welcome to my blog! This is my first post written in Markdown and served by a cu
 
 ## Features
 
-This blog supports:
+This blogew supports:
 
 - **CommonMark** markdown parsing
 - Git-based cache invalidation

src/post_manager.rs

@@ -4,6 +4,7 @@ use pulldown_cmark::{html, Options, Parser};
 use std::collections::HashMap;
 use std::fs;
 use std::path::PathBuf;
+use std::process::Command;
 
 #[derive(Debug, Clone)]
 pub struct Post {
@@ -65,6 +66,74 @@ impl PostManager {
         }
     }
 
+    fn get_post_timestamps(&self) -> Result<HashMap<String, DateTime<Utc>>, String> {
+        let output = Command::new("git")
+            .arg("whatchanged")
+            .arg("--pretty=%h - %cd - %s")
+            .arg("--date=unix")
+            .arg("--")
+            .arg("posts")
+            .current_dir(&self.git_dir)
+            .output()
+            .map_err(|e| format!("Failed to execute git whatchanged: {}", e))?;
+
+        if !output.status.success() {
+            return Err(format!(
+                "Git whatchanged command failed: {}",
+                String::from_utf8_lossy(&output.stderr)
+            ));
+        }
+
+        let log_output = String::from_utf8_lossy(&output.stdout);
+        let mut timestamps: HashMap<String, DateTime<Utc>> = HashMap::new();
+
+        let mut current_timestamp: Option<DateTime<Utc>> = None;
+
+        for line in log_output.lines() {
+            let line = line.trim();
+
+            // Skip empty lines
+            if line.is_empty() {
+                continue;
+            }
+
+            // Parse commit header line: "f4fcf0e - 1761305168 - New post"
+            if !line.starts_with(':') {
+                if let Some(dash_pos) = line.find(" - ") {
+                    let after_first_dash = &line[dash_pos + 3..];
+                    if let Some(second_dash_pos) = after_first_dash.find(" - ") {
+                        let timestamp_str = after_first_dash[..second_dash_pos].trim();
+                        if let Ok(timestamp) = timestamp_str.parse::<i64>() {
+                            current_timestamp = DateTime::from_timestamp(timestamp, 0);
+                        }
+                    }
+                }
+            }
+            // Parse file change line: ":000000 100644 0000000 6bdad65 A        posts/hello-world-2.md"
+            else if line.starts_with(':') {
+                if let Some(timestamp) = current_timestamp {
+                    let parts: Vec<&str> = line.split_whitespace().collect();
+                    if parts.len() >= 6 {
+                        let status = parts[4]; // A (add), D (delete), M (modify)
+                        let file_path = parts[5];
+
+                        // Only process existing files (not deleted ones)
+                        if status != "D" && file_path.starts_with("posts/") {
+                            if let Some(file_name) = file_path.strip_prefix("posts/") {
+                                if let Some(name) = file_name.strip_suffix(".md") {
+                                    // Only update if we don't have a timestamp yet (latest commit wins)
+                                    timestamps.entry(name.to_string()).or_insert(timestamp);
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        Ok(timestamps)
+    }
+
     fn refresh_posts(&mut self) -> Result<(), String> {
         self.posts.clear();