sceptre 0.2.0

Rust reimplementation of EasyOCR (CRAFT detection + gen2 CRNN recognition) over ONNX.
Documentation 
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//! Injectable extension points ("seams") with in-crate default implementations.

use std::path::PathBuf;

use crate::config::{Language, OcrConfig};
use crate::error::Result;
use crate::models::download;
use crate::models::registry::{craft_entry, recognizer_entry};

/// Resolves model artifacts to local paths (download + cache by default).
pub trait ModelProvider: Send + Sync {
    /// Path to the CRAFT detector ONNX.
    fn detector(&self) -> Result<PathBuf>;
    /// Path to the recognizer ONNX for a language group.
    fn recognizer(&self, language: Language) -> Result<PathBuf>;
}

/// Receives coarse progress notifications from the pipeline.
pub trait ProgressSink: Send + Sync {
    /// Called when a pipeline stage begins.
    fn on_stage(&self, _stage: &str) {}
}

/// A progress sink that discards all notifications.
pub(crate) struct NoopProgress;

impl ProgressSink for NoopProgress {}

/// The default model provider: resolves through the Hugging Face hub cache,
/// downloading on miss.
pub(crate) struct DefaultModelProvider {
    cache_dir_override: Option<PathBuf>,
    registry_owner: Option<String>,
}

impl DefaultModelProvider {
    /// Build from config, honoring the optional `model.cache_dir` hub-cache-root
    /// override and the optional `model.registry_owner` re-pointing override.
    pub(crate) fn from_config(config: &OcrConfig) -> Result<Self> {
        Ok(Self {
            cache_dir_override: config.model.cache_dir.clone(),
            registry_owner: config.model.registry_owner.clone(),
        })
    }
}

impl ModelProvider for DefaultModelProvider {
    fn detector(&self) -> Result<PathBuf> {
        download::ensure(
            &craft_entry(),
            self.cache_dir_override.as_deref(),
            self.registry_owner.as_deref(),
        )
    }

    fn recognizer(&self, language: Language) -> Result<PathBuf> {
        download::ensure(
            &recognizer_entry(language),
            self.cache_dir_override.as_deref(),
            self.registry_owner.as_deref(),
        )
    }
}