From 3b311571c92da4be6908c7b7d32b1b46b7224926 Mon Sep 17 00:00:00 2001
From: iximeow <me@iximeow.net>
Date: Tue, 27 Jun 2023 01:48:16 -0700
Subject: [driver] basic tools to track steps as reported by runners

---
 src/ci_runner.rs | 30 ++++++++++++++++++++++++++++++
 src/lua/mod.rs   | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 77 insertions(+)

diff --git a/src/ci_runner.rs b/src/ci_runner.rs
index f78fdbc..a83866d 100644
--- a/src/ci_runner.rs
+++ b/src/ci_runner.rs
@@ -44,6 +44,7 @@ impl RequestedJob {
         RunningJob {
             job: self,
             client,
+            current_step: StepTracker::new(),
         }
     }
 }
@@ -75,6 +76,35 @@ impl JobEnv {
 pub struct RunningJob {
     job: RequestedJob,
     client: RunnerClient,
+    current_step: StepTracker,
+}
+
+pub struct StepTracker {
+    scopes: Vec<String>
+}
+
+impl StepTracker {
+    pub fn new() -> Self {
+        StepTracker {
+            scopes: Vec::new()
+        }
+    }
+
+    pub fn push(&mut self, name: String) {
+        self.scopes.push(name);
+    }
+
+    pub fn pop(&mut self) {
+        self.scopes.pop();
+    }
+
+    pub fn clear(&mut self) {
+        self.scopes.clear();
+    }
+
+    pub fn full_step_path(&self) -> &[String] {
+        self.scopes.as_slice()
+    }
 }
 
 impl RunningJob {
diff --git a/src/lua/mod.rs b/src/lua/mod.rs
index 53473cf..c76afa6 100644
--- a/src/lua/mod.rs
+++ b/src/lua/mod.rs
@@ -177,6 +177,31 @@ mod lua_exports {
             .map_err(|e| LuaError::RuntimeError(format!("could not stat {:?}", path)))?
             .len())
     }
+
+    pub mod step {
+        use crate::RunningJob;
+        use std::sync::{Arc, Mutex};
+
+        pub fn start(job_ref: Arc<Mutex<RunningJob>>, name: String) -> Result<(), rlua::Error> {
+            let mut job = job_ref.lock().unwrap();
+            job.current_step.clear();
+            job.current_step.push(name);
+            Ok(())
+        }
+
+        pub fn push(job_ref: Arc<Mutex<RunningJob>>, name: String) -> Result<(), rlua::Error> {
+            let mut job = job_ref.lock().unwrap();
+            job.current_step.push(name);
+            Ok(())
+        }
+
+        pub fn advance(job_ref: Arc<Mutex<RunningJob>>, name: String) -> Result<(), rlua::Error> {
+            let mut job = job_ref.lock().unwrap();
+            job.current_step.pop();
+            job.current_step.push(name);
+            Ok(())
+        }
+    }
 }
 
 struct DeclEnv<'lua, 'env> {
@@ -268,6 +293,28 @@ impl BuildEnv {
         build_functions.set("environment", build_environment).unwrap();
         let globals = lua_ctx.globals();
         globals.set("Build", build_functions).unwrap();
+
+
+        let step_start = decl_env.create_function("step_start", move |_, job_ref, name: String| {
+            lua_exports::step::start(job_ref, name)
+        })?;
+
+        let step_push = decl_env.create_function("step_push", move |_, job_ref, name: String| {
+            lua_exports::step::push(job_ref, name)
+        })?;
+
+        let step_advance = decl_env.create_function("step_advance", move |_, job_ref, name: String| {
+            lua_exports::step::advance(job_ref, name)
+        })?;
+
+        let step_functions = lua_ctx.create_table_from(
+            vec![
+                ("start", step_start),
+                ("push", step_push),
+                ("advance", step_advance),
+            ]
+        ).unwrap();
+        globals.set("Step", step_functions).unwrap();
         Ok(())
     }
 
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