cli: Add switch to silence checksum warning, and print warning to stderr

xdvdfs-cli/src/cmd_read.rs

@@ -78,12 +78,19 @@ async fn checksum_single(img_path: &str) -> Result<(), anyhow::Error> {
 }
 
 #[maybe_async]
-pub async fn cmd_checksum(images: &Vec<String>) -> Result<(), anyhow::Error> {
-    println!("This SHA256 sum is a condensed checksum of the all the data inside the image");
-    println!("It does not encode information about the filesystem structure outside of the data being in the correct order.");
-    println!("Note that this is NOT a SHA256 sum of the full image, and cannot be compared to a SHA256 sum of the full image.");
-    println!("This checksum is only useful when compared to other checksums created by this tool.");
-    println!();
+pub async fn cmd_checksum(
+    images: &Vec<String>,
+    silence_warning: bool,
+) -> Result<(), anyhow::Error> {
+    if !silence_warning {
+        eprintln!("This SHA256 sum is a condensed checksum of the all the data inside the image");
+        eprintln!("It does not encode information about the filesystem structure outside of the data being in the correct order.");
+        eprintln!("Note that this is NOT a SHA256 sum of the full image, and cannot be compared to a SHA256 sum of the full image.");
+        eprintln!(
+            "This checksum is only useful when compared to other checksums created by this tool."
+        );
+        eprintln!();
+    }
 
     for image in images {
         checksum_single(image).await?;

xdvdfs-cli/src/main.rs

@@ -42,6 +42,9 @@ enum Cmd {
     Checksum {
         #[arg(help = "Path to XISO image")]
         images: Vec<String>,
+
+        #[arg(short, long, help = "Only output checksums without warnings")]
+        silent: bool,
     },
     #[command(
         about = "Print information about image metadata",
@@ -90,7 +93,7 @@ async fn run_command(cmd: &Cmd) -> Result<(), anyhow::Error> {
         Ls { image_path, path } => cmd_read::cmd_ls(image_path, path).await,
         Tree { image_path } => cmd_read::cmd_tree(image_path).await,
         Md5 { image_path, path } => cmd_md5::cmd_md5(image_path, path.clone().as_deref()).await,
-        Checksum { images } => cmd_read::cmd_checksum(images).await,
+        Checksum { images, silent } => cmd_read::cmd_checksum(images, *silent).await,
         Info {
             image_path,
             file_entry,