From 8d020342f0c555c7d6f98179b8165fae246c6da6 Mon Sep 17 00:00:00 2001
From: Jonas Maier <jonas@x77.dev>
Date: Sat, 9 May 2026 18:00:35 +0200
Subject: more builtin variables

---
 build.rs       | 41 +++++++++++++++++++++++++++++++++++++++++
 src/consts.rs  |  3 +++
 src/lib.rs     |  1 +
 src/run/mod.rs |  3 +++
 4 files changed, 48 insertions(+)
 create mode 100644 build.rs
 create mode 100644 src/consts.rs

diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..95a5eae
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,41 @@
+use std::process::Command;
+
+fn git(args: &[&str]) -> String {
+    let output = Command::new("git")
+        .args(args)
+        .output()
+        .expect("failed to execute git");
+
+    if !output.status.success() {
+        panic!("git command failed: git {}", args.join(" "));
+    }
+
+    String::from_utf8(output.stdout)
+        .expect("git output not utf8")
+        .trim()
+        .to_string()
+}
+
+fn main() {
+    // Re-run if HEAD changes
+    println!("cargo:rerun-if-changed=.git/HEAD");
+    println!("cargo:rerun-if-changed=.git/refs");
+
+    let git_hash = git(&["rev-parse", "HEAD"]);
+    let git_hash_short = git(&["rev-parse", "--short", "HEAD"]);
+
+    let git_dirty = {
+        let status = Command::new("git")
+            .args(["diff", "--quiet"])
+            .status()
+            .expect("failed to check git dirty state");
+
+        if status.success() { false } else { true }
+    };
+
+    println!("cargo:rustc-env=GIT_HASH={git_hash}");
+    println!("cargo:rustc-env=GIT_HASH_SHORT={git_hash_short}");
+    if git_dirty {
+        println!("cargo:rustc-env=GIT_DIRTY=1");
+    }
+}
diff --git a/src/consts.rs b/src/consts.rs
new file mode 100644
index 0000000..7e5d0fd
--- /dev/null
+++ b/src/consts.rs
@@ -0,0 +1,3 @@
+pub const PISH_VERSION: &str = env!("CARGO_PKG_VERSION");
+pub const PISH_COMMIT: &str = env!("GIT_HASH_SHORT");
+pub const PISH_DIRTY: bool = option_env!("GIT_DIRTY").is_some();
diff --git a/src/lib.rs b/src/lib.rs
index 2af7e08..44ea346 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -18,6 +18,7 @@ use std::sync::{Arc, Mutex};
 pub mod ansi;
 pub mod basedir;
 pub mod completion;
+pub mod consts;
 pub mod ctrlc;
 pub mod cursor;
 pub mod date;
diff --git a/src/run/mod.rs b/src/run/mod.rs
index bae9567..ddac394 100644
--- a/src/run/mod.rs
+++ b/src/run/mod.rs
@@ -465,6 +465,9 @@ impl parse::Expander for Executor {
     ) -> Result<BString, Self::Error> {
         match &var[..] {
             b"CWD_PRETTY" => return Ok(crate::pretty_cwd().into_bytes()),
+            b"PISH_VERSION" => return Ok(crate::consts::PISH_VERSION.as_bytes().to_vec()),
+            b"PISH_COMMIT" => return Ok(crate::consts::PISH_COMMIT.as_bytes().to_vec()),
+            b"PISH_DIRTY" => return Ok(vec![crate::consts::PISH_DIRTY as u8 + b'0']),
             _ => {}
         }
 
-- 
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