Add cmd help to readme + test

README.md

@@ -12,6 +12,25 @@ Library and CLI tool for working with Unreal Engine .pak files.
  - 2x faster unpacking over `UnrealPak`. As much as 30x faster has been observed (on Linux unpacked to ramdisk)
  - Unpacking is guarded against malicious pak that attempt to write to parent directories
 
+## cli
+```
+Usage: repak [OPTIONS] <COMMAND>
+
+Commands:
+  info       Print .pak info
+  list       List .pak files
+  hash-list  List .pka files and the SHA256 of their contents. Useful for finding differences between paks
+  unpack     Unpack .pak file
+  pack       Pack directory into .pak file
+  get        Reads a single file to stdout
+  help       Print this message or the help of the given subcommand(s)
+
+Options:
+  -a, --aes-key <AES_KEY>  256 bit AES encryption key as base64 or hex string if the pak is encrypted
+  -h, --help               Print help
+  -V, --version            Print version
+```
+
 ## compatibility
 
 | UE Version | Version | Version Feature       | Read               | Write              |

repak_cli/Cargo.toml

@@ -26,3 +26,6 @@ path-slash = "0.2.1"
 rayon = "1.6.1"
 sha2 = "0.10.7"
 strum = { workspace = true }
+
+[dev-dependencies]
+assert_cmd = "2.0.12"

repak_cli/tests/docs.rs

@@ -0,0 +1,24 @@
+fn workspace_dir() -> std::path::PathBuf {
+    let output = std::process::Command::new(env!("CARGO"))
+        .arg("locate-project")
+        .arg("--workspace")
+        .arg("--message-format=plain")
+        .output()
+        .unwrap()
+        .stdout;
+    let cargo_path = std::path::Path::new(std::str::from_utf8(&output).unwrap().trim());
+    cargo_path.parent().unwrap().to_path_buf()
+}
+
+#[test]
+fn test_readme_help() {
+    use assert_cmd::prelude::*;
+    use std::process::Command;
+
+    let err = Command::cargo_bin("repak").unwrap().unwrap_err();
+    let help = std::str::from_utf8(&err.as_output().unwrap().stderr).unwrap();
+
+    let readme = std::fs::read_to_string(workspace_dir().join("README.md")).unwrap();
+
+    assert!(readme.contains(&format!("```\n{help}```")));
+}