Include commit hash in version output

CLAUDE.md

@@ -47,3 +47,7 @@ cargo clippy --all-targets -- -D warnings
 
 When the user asks to run clippy and provides the ability to run on both targets, try to run it
 on both targets.
+
+## Formatting
+
+After modifying code, run `cargo fmt` to ensure consistent formatting before committing changes.

README.md

@@ -256,7 +256,7 @@ OPTIONS:
     --timeout <SECONDS>         Timeout for command execution
     -v, --verbose               Increase verbosity (-vvv for max)
     -h, --help                  Print help
-    -V, --version               Print version
+    -V, --version               Print version with commit hash
 
 RULE FORMAT:
     Rules are specified with -r/--rule and use the format:

build.rs

@@ -0,0 +1,28 @@
+use std::env;
+use std::process::Command;
+
+fn main() {
+    // Retrieve crate version provided by Cargo
+    let version = env::var("CARGO_PKG_VERSION").unwrap_or_else(|_| "unknown".to_string());
+
+    // Try to get short commit hash
+    let git_hash = Command::new("git")
+        .args(["rev-parse", "--short", "HEAD"])
+        .output()
+        .ok()
+        .and_then(|o| {
+            if o.status.success() {
+                Some(String::from_utf8_lossy(&o.stdout).trim().to_string())
+            } else {
+                None
+            }
+        })
+        .unwrap_or_else(|| "unknown".to_string());
+
+    // Export as environment variables for use in the code and tests
+    println!("cargo:rustc-env=GIT_HASH={}", git_hash);
+    println!(
+        "cargo:rustc-env=VERSION_WITH_GIT_HASH={} ({})",
+        version, git_hash
+    );
+}

src/main.rs

@@ -10,7 +10,7 @@ use tracing::{debug, info, warn};
 
 #[derive(Parser, Debug)]
 #[command(name = "httpjail")]
-#[command(version, about, long_about = None)]
+#[command(version = env!("VERSION_WITH_GIT_HASH"), about, long_about = None)]
 #[command(about = "Monitor and restrict HTTP/HTTPS requests from processes")]
 struct Args {
     /// Rules for filtering requests (can be specified multiple times)

tests/smoke_test.rs

@@ -15,10 +15,10 @@ fn test_httpjail_help() {
 fn test_httpjail_version() {
     let mut cmd = Command::cargo_bin("httpjail").unwrap();
     cmd.arg("--version");
-
+    let hash = env!("GIT_HASH");
     cmd.assert()
         .success()
-        .stdout(predicate::str::contains("httpjail"));
+        .stdout(predicate::str::contains("httpjail").and(predicate::str::contains(hash)));
 }
 
 #[test]