Prepublish command

src/bin/prepublish/main.rs

@@ -1,4 +1,44 @@
+use std::{env, fs, process};
+
+use chrono::Utc;
+
+use blog::post::PostSource;
 
 fn main() {
+    let mut failed = false;
 
+    let paths = env::args_os()
+        .skip(1);
+    
+    for path in paths {
+        let contents = match fs::read_to_string(&path) {
+            Ok(contents) => contents,
+            Err(err) => {
+                eprintln!("failed to read {}: {}", path.to_string_lossy(), err);
+                failed = true;
+                continue
+            }
+        };
+
+        let mut source = match contents.parse::<PostSource>() {
+            Ok(source) => source,
+            Err(err) => {
+                eprintln!("failed to parse {}: {}", path.to_string_lossy(), err);
+                failed = true;
+                continue
+            },
+        };
+
+        *source.header_mut().published_mut() = Utc::now();
+
+        if let Err(err) = fs::write(&path, source.to_string()) {
+            eprintln!("failed to write {}: {}", path.to_string_lossy(), err);
+                failed = true;
+                continue
+        }
+    }
+
+    if failed {
+        process::exit(1);
+    }
 }

src/lib/post/header.rs

@@ -92,6 +92,6 @@ impl fmt::Display for Header {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         toml::to_string_pretty(self)
             .map_err(|_| fmt::Error)
-            .and_then(|s| f.write_str(&s))
+            .and_then(|s| f.write_str(s.trim()))
     }
 }