zerostack 1.0.0

Minimalistic coding agent written in Rust, optimized for memory footprint and performance
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use std::path::PathBuf;

pub mod plan;
pub mod transcript;

pub struct LoopState {
    pub active: bool,
    pub prompt: String,
    pub plan_file: PathBuf,
    pub iteration: u32,
    pub max_iterations: Option<u32>,
    pub last_summary: Option<String>,
    pub run_cmd: Option<String>,
    pub last_run_output: Option<String>,
}

impl LoopState {
    pub fn new(
        prompt: String,
        plan_file: PathBuf,
        max_iterations: Option<u32>,
        run_cmd: Option<String>,
    ) -> Self {
        LoopState {
            active: true,
            prompt,
            plan_file,
            iteration: 0,
            max_iterations,
            last_summary: None,
            run_cmd,
            last_run_output: None,
        }
    }

    pub fn build_prompt(&self) -> String {
        let plan_contents = plan::read_plan(&self.plan_file).unwrap_or_default();

        let max_label = match self.max_iterations {
            Some(max) => max.to_string(),
            None => "∞".to_string(),
        };

        let summary = self.last_summary.as_deref().unwrap_or("starting fresh");
        let run_output = self.last_run_output.as_deref().unwrap_or("(none)");

        format!(
            "{}\n\n--- Loop Context (Iteration {}/{}) ---\n\nCurrent plan ({}):\n{}\n\nPrevious iteration summary:\n{}\n\nPrevious validation output:\n{}\n\n--- Instructions ---\n- Choose ONE task from the plan. Do not implement multiple things.\n- Before writing code, search the codebase with grep/find_files first.\n- After implementing: run the tests for the changed code.\n- Keep LOOP_PLAN.md up to date: mark completed items, add new findings.\n- If you discover bugs unrelated to your task, document them in LOOP_PLAN.md.\n- Commit working changes with descriptive messages.",
            self.prompt,
            self.iteration,
            max_label,
            self.plan_file.display(),
            plan_contents,
            summary,
            run_output,
        )
    }

    pub fn iteration_label(&self) -> String {
        let max_label = match self.max_iterations {
            Some(max) => max.to_string(),
            None => "∞".to_string(),
        };
        format!("LOOP {}/{}", self.iteration, max_label)
    }

    pub fn should_stop(&self) -> bool {
        match self.max_iterations {
            Some(max) => self.iteration >= max,
            None => false,
        }
    }
}