specfold-core 0.1.0

Library behind specfold: typed Markdown documents, owners, a derived graph and checks.
Documentation 
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//! A store reached through a command the user already trusts (rclone, aws, gsutil, wrangler …).
//! specfold never handles credentials: the command reads them from its own configuration.

use super::types::Store;
use anyhow::{Result, anyhow, bail};
use std::path::Path;
use std::process::Command;

pub struct CommandStore {
    pub put: Option<Vec<String>>,
    pub get: Option<Vec<String>>,
    pub exists: Option<Vec<String>>,
}

fn run(template: &[String], key: &str, src: &str, dst: &str) -> Result<std::process::Output> {
    let args: Vec<String> =
        template.iter().map(|a| a.replace("{key}", key).replace("{src}", src).replace("{dst}", dst)).collect();
    let (prog, rest) = args.split_first().ok_or_else(|| anyhow!("empty store command"))?;
    Command::new(prog).args(rest).output().map_err(|e| anyhow!("cannot run {prog}: {e}"))
}

impl Store for CommandStore {
    fn put(&self, src: &Path, key: &str) -> Result<()> {
        let t = self.put.as_ref().ok_or_else(|| anyhow!("files.store.put is not configured"))?;
        let out = run(t, key, &src.to_string_lossy(), "")?;
        if !out.status.success() {
            bail!("store put failed: {}", String::from_utf8_lossy(&out.stderr).trim());
        }
        Ok(())
    }

    fn get(&self, key: &str, dst: &Path) -> Result<()> {
        let t = self.get.as_ref().ok_or_else(|| anyhow!("files.store.get is not configured"))?;
        if let Some(p) = dst.parent() {
            std::fs::create_dir_all(p)?;
        }
        let out = run(t, key, "", &dst.to_string_lossy())?;
        if !out.status.success() {
            bail!("store get failed: {}", String::from_utf8_lossy(&out.stderr).trim());
        }
        Ok(())
    }

    fn exists(&self, key: &str) -> Result<Option<bool>> {
        let Some(t) = &self.exists else { return Ok(None) };
        Ok(Some(run(t, key, "", "")?.status.success()))
    }
}